Messages

1

VHF/UHF Logs, including satellites and radiosondes / Data Bursts 30.1915 MHz 30191.5 kHz 30.192 MHz [Via G8JNJ SDR] 16 Oct 2024

« on: October 24, 2024, 1235 UTC »

30.1915 MHz center frequency
Bandwidth 6 kHz, maybe 6.5 kHz or 7.0 kHz?
6K00F2D 6K00F1D
6K50F2D 6K50F1D
7K00F2D 7K50F1D

Received via G8JNJ SDR receiver in the UK.  Link to video clip below:

https://www.youtube.com/watch?v=PjyXQY42kOg

This is a unique one for me anyway.  I've logged data bursts on 30.155 MHz and various frequencies in the 26-28 MHz and 29.7 MHz - 30 MHz ballpark, plus more standard frequencies on regular old 30-50 MHz VHF low band. 

30.190 MHz is one of the 30 MHz remote control / wireless control telecommand frequencies available in Norway, power output is limited to 100mW and bandwidth is limited to 10 kHz.  So in a perfect world, 30.190 MHz center frequency, 30.185 MHz - 30.195 MHz. 

30.010 MHz
30.020 MHz
30.030 MHz
30.040 MHz
30.050 MHz
30.060 MHz
30.070 MHz
30.080 MHz
30.090 MHz
30.100 MHz
30.110 MHz
30.120 MHz
30.130 MHz
30.140 MHz
30.150 MHz
30.160 MHz
30.170 MHz
30.180 MHz
30.190 MHz
30.200 MHz
30.210 MHz
30.220 MHz
30.230 MHz
30.240 MHz
30.250 MHz
30.260 MHz
30.270 MHz
30.280 MHz
30.290 MHz
30.290 MHz
30.300 MHz

This does meet those requirements, since a 7 kHz wide signal is 30.188 MHz - 30.195 MHz (center frequency: 30.191.5 MHz).

In Spain, the frequency 30.195 MHz is allowed for RC R/C remote control radio control wireless control links telecommand - regulations permit  remote control, wireless command, wireless measurement, telemetry, telecommand.  500mW transmitter power output limit, ERP limit is 100mW (??)  10 kHz channel bandwidth, allocation 29 MHz / 30 MHz. 


29.710 MHz
29.720 MHz
29.730 MHz
29.740 MHz
29.750 MHz
29.760 MHz
29.770 MHz
29.780 MHz
29.790 MHz
29.800 MHz
29.810 MHz
29.820 MHz
29.830 MHz
29.840 MHz
29.850 MHz
29.860 MHz
29.870 MHz
29.880 MHz
29.890 MHz
29.900 MHz
29.910 MHz
29.920 MHz
29.930 MHz
29.940 MHz
29.950 MHz
29.960 MHz
29.970 MHz
29.980 MHz
29.990 MHz
30.035 MHz
30.045 MHz
30.055 MHz
30.065 MHz
30.075 MHz
30.085 MHz
30.095 MHz
30.105 MHz
30.115 MHz
30.125 MHz
30.135 MHz
30.145 MHz
30.155 MHz
30.165 MHz
30.175 MHz
30.185 MHz
30.195 MHz
30.205 MHz
30.215 MHz
30.225 MHz
30.235 MHz
30.245 MHz
30.255 MHz
30.265 MHz
30.275 MHz
30.285 MHz
30.295 MHz

The 30.190 MHz - 30.200 MHz channel limits don't quite work in this situation, but there's always the possibility that it is simply an off-frequency transmitter - either off-frequency from 30.190 MHz or off-frequency from 30.195 MHz. 

2

Peskies / Re: 10.542 USB at 02:18 UTC Mexican Fishermen

« on: October 23, 2024, 1352 UTC »

10.542 MHz USB 10542 kHz USB is not a legal marine channel / frequency.

10542 kHz USB is used by the Civil Air Patrol - channel/frequency designator "NET 7".  It also apparently used by the Russian Navy.

As far as the frequency itself, it falls within the Fixed/Mobile Service allocation, specifically the 10150 kHz - 11175 kHz band or 10.150 MHz to 11.175 MHz band.

https://www.hfunderground.com/wiki/index.php/Fixed/Mobile_bands

^Link for more information.  The fixed mobile bands are used for...well, everything.

Here are the (legal) MF / HF SSB marine bands (often just called "HF marine" even though there is a considerable amount of activity in the 1.6 MHz to 3 MHz range, which is technically MF, not HF - but for practical purposes, 2-30 MHz is called "HF" - although some equipment manufacturers do 1.6 MHz to 27.5 MHz instead of 1.6 MHz to 30 MHz or something along those lines.   

https://www.hfunderground.com/wiki/index.php/HF_marine#MF_SSB_and_HF_SSB_marine_bands

Closest maritime mobile service allocations are the 8 MHz marine band and the 12 MHz marine band.

8 MHz band - maritime service 8195 kHz - 8815 kHz or 8.195 MHz to 8.815 MHz. 
8 MHz band - shared with fixed/mobile service 8000 kHz - 8195 kHz or 8.000 MHz to 8.195 MHz

12 MHz band - maritime service 12330 kHz - 13200 kHz or 12.330 MHz to 13.200 MHz. 

Both the 8MHz and 12MHz bands are pretty extensively used, as are the 2-3 MHz band, the 4 MHz band and the 6 MHz band. 


6 MHz band 6200 kHz to 6525 kHz or 6.200 MHz to 6.525 MHz is also used for numerous other purposes.  The lower portion especially is used for shortwave broadcasting.

4 MHz band 4063 kHz to 4438 kHz or 4.063 MHz to 4.438 MHz.  The 4000 kHz to 4063 kHz fixed mobile band is also used for marine purposes on a shared basis.  4.000 MHz to 4.063 MHz.

2 MHz band allocation varies from country to country:

2000 kHz to 2300 kHz
2450 kHz to 2850 kHz

The 2850 kHz to 3155 kHz band (2.850 MHz to 3.155 MHz) and the 3400 kHz to 3500 kHz (3.400 MHz to 3.500 MHz) bands are both allocated to the aeronautical service (aircraft radio) but both of those bands widely used for marine purposes too.  The 3155 kHz to 3200 kHz band is allocated to the fixed mobile service, but many marine users simply use the entire 1.6 MHz to 4 MHz band, or the 1.6 MHz to 3.5 MHz band 1600 kHz band to 3.500 MHz band for marine purposes. 

The 1610 kHz to 1800 kHz band is used for marine purposes rather extensively outside ITU Region 2.  It is also used for fishnet radio bouys, along with the larger 1.6 MHz to 4.0 MHz band and the 25 MHz to 30 MHz band, including the 26 MHz - 28 MHz CB allocations and the 28 MHz - 29.7 MHz 10 meter ham radio (amateur radio) allocation.

2000-2300 kHz   MF 2 MHz marine band - USB voice calling/distress 2182 kHz, DSC calling/distress 2187.5 kHz - USCG no longer monitors 2182 kHz USB
2450-2850 kHz   MF 2 MHz marine band, USB voice and FSK modes, some AM voice heard here in Russia, Eastern Europe and Asia (older-generation trawler radios 2-4 MHz AM mode, many users operate outside this band, roughly around 3 MHz)

3

VHF/UHF Logs, including satellites and radiosondes / Asian Fishing Fleets 27.5 MHz - 39.5 MHz Logs 2023/2024

« on: October 22, 2024, 1457 UTC »

Logs, received locally and via SDR receivers located in the UK.  All frequencies are in MHz.  NFM is the mode 16K0F3E "20 kHz" channel bandwidth, 25 kHz spacing (officially) and 12.5 kHz spacing (unofficially).  Carrier squelch is used throughout.  Selective calling is done via 300 baud 300bps AFSK or 1200 baud 1200bpd MFSK in-band on-frequency signaling.  Data broadcast and GPS location transmission automatically included.  Calling channels CH221, CH231, CH236 and CH238. 

channel 221 - 32.875 MHz FM [CSQ]
channel 231 - 33.100 MHz FM [CSQ]
channel 236 - 33.225 MHz FM [CSQ]
channel 238 - 33.275 MHz FM [CSQ]

Not included in this list were fishermen using modified CB equipment, operating between 25.615 MHz and 30.105 MHz, mostly AM mode, but some FM noted.  Also not included were fishermen using VHF low band equipment, i.e. Canadian and U.S. trawlers on 29.770 MHz FM, 29.790 MHz FM, 29.820 MHz FM, 29.840 MHz FM and others, only 29.77 MHz FM and 29.79 MHz FM are legal Part 90 frequencies in the U.S. under the Business Radio Service

27.5000 MHz FM [CSQ] - QRM from/to digital modes, CW beacons and SSB voice
27.5125 MHz FM [CSQ] - active paging pager system on 27.505 MHz and 27.510 MHz
27.5250 MHz FM [CSQ] - severe QRM due to 27.525 MHz AM being popular in U.S.A. with freeband CB
27.5375 MHz FM [CSQ] - severe QRM with 27.535 MHz AM 27.535 MHz FM 27.54 MHz SSB CB freebanders
27.5500 MHz FM [CSQ] - Severe QRM from/to 27.555 MHz USB, 27.550 MHz USB, 27.545 MHz, etc.
27.5625 MHz FM [CSQ] - 27.560 MHz USB, 27.565 MHz AM FM USB LSB QRM city
27.5750 MHz FM [CSQ] - QRM with 27.575 MHz AM and freeband CB radio users on/near frequency 27575kHz
27.5875 MHz FM [CSQ] - QRM with 27.585 MHz AM and freeband CB 11m 27585 kHz 27.590 MHz
27.59625 MHz - BEGIN UK FM CB 27/81 BAND 27.60125 MHz - 27.99125 MHz FM only 10 kHz steps
27.60125 MHz - BEGIN CADS/WPAS 27.60125 MHz - 27.99125 MHz 10 kHz steps
27.6050 MHz - BEGIN CADS/WPAS 27.605 MHz - 27.995 MHz 10 kHz steps
27.6000 MHz FM [CSQ] - QRM with UK FM CB channel 1 freq. 27.60125 MHz FM, also pagers on 27.6MHz
27.6250 MHz FM [CSQ] - QRM from/to various CB and land mobile networks 27MHz 27.62125 MHz FM
27.6375 MHz FM [CSQ] - Severe QRM from ROS data mode 27.635 MHz USB, also U.S. truckers on 27.635 MHz AM
27.6500 MHz FM [CSQ] - U.S. military carrier 27.650 MHz, also UK FM CB radio 27.65125 MHz FM
27.6625 MHz FM [CSQ] - Severe QRM from SSB CB radio comms on/near frequency i.e. 27.665 MHz USB
27.6750 MHz FM [CSQ] - Severe QRM from SSB CB comms on/near this frequency
27.7000 MHz FM [CSQ] - Severe QRM due to 27.700 MHz USB SSTV frequency, also 27.70125 MHz FM UK FM CB
27.7125 MHz FM [CSQ] - QRM w/ UK FM CB frequency 27.71125 MHz FM right on top of that frequency
27.7250 MHz FM [CSQ] - Active LMR/PMR system, 27.720 MHz data link/telemetry
27.7375 MHz FM [CSQ] - 27.735 MHz FM 27.735 MHz FM and 27.74125 MHz FM UK FM CB Channel 15
27.7500 MHz FM [CSQ] - QRM, UK FM CB 27.75125 MHz FM 27.751 FM CADS WPAS
27.7625 MHz FM [CSQ] - QRM with data links on 27.760 MHz
27.7750 MHz FM [CSQ] - Heavy QRM, UK FM CB channels 18 and 19, esp. 27.78125 MHz FM and LMR/PMR users
27.8000 MHz FM [CSQ] - QRM with pagers, telemetry, fishnet buoys, also 27.80125 MHz FM UK FM CB
27.8250 MHz FM [CSQ] - QRM with CADS/WPAS, Russian taxi cab dispatchers and other land mobile users
27.8375 MHz FM [CSQ] - 27.835 MHz FM busy Russian taxi cab dispatcher radio YL Olga
27.8500 MHz FM [CSQ] - QRM with UK FM 27.85125 MHz FM, as well as CADS/WPAS and pagers on 27.845 MHz
27.8625 MHz FM [CSQ] - Active Russian land mobile users 27.865 MHz FM and freeband CB 27.865 MHz AM
27.8750 MHz FM [CSQ] - Adjacent to 27MHz marine CH88 emergency 27.88 MHz AM
27.8875 MHz FM [CSQ] - QRM from paging system on 27.885 MHz FM
27.9000 MHz FM [CSQ] - QRM from/to paging systems, UK FM CB 27.90125 MHz FM and data link/telemetry
27.9125 MHz FM [CSQ] - QRM from/to UK FM CB 27.91125 MHz FM (very close in frequency)
27.9250 MHz FM [CSQ] - QRM from/to LMR land mobile systems 27.925 MHz and marine users 27.92 MHz AM
27.9375 MHz FM [CSQ] - QRM from/to LMR comms 27.935 MHz FM, 27.94 MHz AM marine users
27.9500 MHz FM [CSQ] - QRM from/to data links, pagers 27.95MHz, UK FM CB 27.95125 MHz FM CB36
27.9625 MHz FM [CSQ] - QRM from/to various CB comms 27.965 MHz AM and FM
27.9750 MHz FM [CSQ] - QRM from/to UK FM CB 27.981 FM 27.97125 MHz FM, taxis and freeband CB
27.9875 MHz FM [CSQ] - QRM from/to UK FM CB 27.98125 MHz 27.99125 MHz, taxis on 27.985 MHz FM
27.99125 MHz - END CADS/WPAS 27.60125 MHz - 27.99125 MHz 10 kHz steps
27.9950 MHz - END CADS/WPAS 27.605 MHz - 27.995 MHz 10 kHz steps
27.99625 MHz - END UK FM CB 27/81 BAND 27.60125 MHz - 27.99125 MHz FM only 10 kHz steps
28.0000 MHz - BEGIN 10 METER HAM RADIO ALLOCATION 29700 kHz 29.7 MHz
28.0000 MHz FM [CSQ]
28.0125 MHz FM [CSQ]
28.0250 MHz FM [CSQ]
28.0500 MHz FM [CSQ]
28.0625 MHz FM [CSQ]
28.1000 MHz FM [CSQ]
28.1125 MHz FM [CSQ]
28.1250 MHz FM [CSQ]
28.1375 MHz FM [CSQ]
28.1500 MHz FM [CSQ] - often with Russian taxi QRM 28.145 MHz FM 28.155 MHz FM
28.1750 MHz FM [CSQ]
28.2000 MHz FM [CSQ]
28.2250 MHz FM [CSQ]
28.2750 MHz FM [CSQ]
28.3000 MHz FM [CSQ]
28.3125 MHz FM [CSQ]
28.3250 MHz FM [CSQ]
28.3375 MHz FM [CSQ]
28.3500 MHz FM [CSQ]
28.3750 MHz FM [CSQ]
28.4000 MHz FM [CSQ]
28.4250 MHz FM [CSQ]
28.4125 MHz FM [CSQ]
28.4375 MHz FM [CSQ]
28.4500 MHz FM [CSQ]
28.4750 MHz FM [CSQ]
28.5750 MHz FM [CSQ]
28.6000 MHz FM [CSQ]
28.6125 MHz FM [CSQ]
28.6500 MHz FM [CSQ]
28.6750 MHz FM [CSQ]
28.6875 MHz FM [CSQ]
28.7000 MHz FM [CSQ]
28.7250 MHz FM [CSQ]
28.7375 MHz FM [CSQ]
28.7500 MHz FM [CSQ] - often with Russian taxi cab QRM
28.7625 MHz FM [CSQ] - often with Russian taxi cab QRM 28.765 MHz 28.755 MHz
28.7750 MHz FM [CSQ]
28.8000 MHz FM [CSQ]
28.8250 MHz FM [CSQ]
28.8500 MHz FM [CSQ]
28.8750 MHz FM [CSQ]
28.8875 MHz FM [CSQ] - Very busy channel
28.9000 MHz FM [CSQ]
28.9250 MHz FM [CSQ]
28.9500 MHz FM [CSQ]
28.9750 MHz FM [CSQ]
29.0000 MHz FM [CSQ]
29.0125 MHz FM [CSQ] - often with pretty bad QRM 29.000 MHz AM 29.010 MHz AM
29.0250 MHz FM [CSQ]
29.0500 MHz FM [CSQ]
29.0750 MHz FM [CSQ]
29.1000 MHz FM [CSQ]
29.1250 MHz FM [CSQ]
29.1500 MHz FM [CSQ]
29.1750 MHz FM [CSQ] - very busy
29.1875 MHz FM [CSQ]
29.2000 MHz FM [CSQ]
29.2125 MHz FM [CSQ]
29.2250 MHz FM [CSQ] - very busy, lots of chatter
29.2500 MHz FM [CSQ]
29.2750 MHz FM [CSQ]
29.3000 MHz FM [CSQ]
29.3250 MHz FM [CSQ]
29.3375 MHz FM [CSQ]
29.3500 MHz FM [CSQ]
29.3625 MHz FM [CSQ]
29.3750 MHz FM [CSQ]
29.4000 MHz FM [CSQ]
29.4250 MHz FM [CSQ]
29.4500 MHz FM [CSQ]
29.4625 MHz FM [CSQ]
29.4750 MHz FM [CSQ] - very busy
29.5000 MHz FM [CSQ]
29.5125 MHz FM [CSQ]
29.5250 MHz FM [CSQ]
29.5500 MHz FM [CSQ]
29.5625 MHz FM [CSQ]
29.5750 MHz FM [CSQ]
29.6000 MHz FM [CSQ] - causing QRM to 10 meter FM calling frequency 29.6 MHz FM
29.6125 MHz FM [CSQ]
29.6250 MHz FM [CSQ]
29.6375 MHz FM [CSQ]
29.6500 MHz FM [CSQ]
29.6625 MHz FM [CSQ] - causing severe QRM to 29.66 MHz FM
29.6750 MHz FM [CSQ] - causing QRM from 10m ham operators - repeater outputs 29.66MHz FM 29.67 MHz FM
29.6875 MHz FM [CSQ] - non amateur comms, causing QRM from 10m repeater output 29.68 MHz 29.69 MHz
29.7000 MHz FM [CSQ] - frequent QRM from UNID users on 29.700 MHz USB - freeband outband comms
29.7000 MHz - END 10 METER HAM RADIO ALLOCATION 29700 kHz 29.7 MHz
29.7125 MHz FM [CSQ] - next to U.S. LMR channel 29.710 MHz FM
29.7250 MHz FM [CSQ] - next to U.S. LMR channel 29.730 MHz FM
29.7375 MHz FM [CSQ] - QRM from FSK data signals and other unknown data bursts
29.7500 MHz FM [CSQ] - QRM from POCSAG paging signals on 29.750 MHz FM
29.7625 MHz FM [CSQ] - QRM due to various FSK signals on/near frequency, also Russian taxis 29.765 MHz FM
29.7750 MHz FM [CSQ] - next to U.S. LMR channel 29.770 MHz FM
29.7875 MHz FM [CSQ] - next to U.S. LMR channel 29.790 MHz FM
29.8000 MHz FM [CSQ] - Often severe QRM from paging signals on frequency 29.8 MHz, also data bursts 29.805 MHz
29.8125 MHz FM [CSQ] - Sporadic QRM from CIS taxi cab LMR systems 29.815 MHz FM
29.8250 MHz FM [CSQ] - Very busy
29.8375 MHz FM [CSQ] - QRM from Russian taxi cab dispatcher lady 29.835 MHz FM
29.8500 MHz FM [CSQ] - QRM from OTH Radar and Russian taxi dispatcher on 29.855 MHz FM
29.8625 MHz FM [CSQ] - QRM from "Foghorn" radar (often 30-50+ kHz wide)
29.8750 MHz FM [CSQ] - Very busy, often severe QRM
29.8875 MHz FM [CSQ] - QRM from OTHR, FSK data signals and UNID land mobile users 29.88 MHz and 29.885 MHz
29.9000 MHz FM [CSQ] - Often severe QRM from paging signals on frequency 29.9 MHz
29.9125 MHz FM [CSQ] - QRM from freeband CBers 29.915 MHz AM and Russian taxis 29.915 MHz FM
29.9250 MHz FM [CSQ]
29.9375 MHz FM [CSQ] - Data links (poly tone) on 29.935 MHz, UNID free band signals 29.940 MHz LSB
29.9500 MHz FM [CSQ] - QRM from Russian taxi dispatch lady LMR 29.945 MHz FM 29.955 MHz FM
29.9625 MHz FM [CSQ] - QRM from Datawell waverider FSK signals and Russian taxi cab 29.965 MHz FM
29.9750 MHz FM [CSQ] - Sporadic QRM from studio link? 29.9735 MHz AM 29.974MHz AM
29.9875 MHz FM [CSQ] - QRM from carriers, chirpers, etc. 29.995 MHz, 29.985 MHz, etc.
30.0000 MHz - BEGIN MILITARY TACTICAL FM 30-88 MHz
30.0000 MHz - BEGIN U.S. MILITARY PRIMARY BAND 25 kHz STEPS TO 30.575 MHz
30.0000 MHz FM [CSQ] - Often severe QRM from carriers, chirpers and military comms on 30.000 MHz
30.0125 MHz FM [CSQ] - QRM from chirpers and carriers on/near 30.000 MHz, 30.005 MHz, 30.01 MHz, etc.
30.0250 MHz FM [CSQ] - QRM from military comms and Canada POCSAG pagers 30.020 MHz 30.022 MHz
30.0375 MHz FM [CSQ]
30.0500 MHz FM [CSQ] - QRM from Russian taxi cab dispatcher lady 30.055 MHz FM
30.0625 MHz FM [CSQ]
30.0750 MHz FM [CSQ] - Military FM voice and secure comms active on frequency
30.0875 MHz FM [CSQ] - QRM from Russian taxi cab dispatcher lady 30.085 MHz FM
30.1000 MHz FM [CSQ] - QRM, 30.100 MHz POCSAG pager, Russian mil, Russian taxis on 30.095MHz 30.105MHz
30.1125 MHz FM [CSQ] - QRM from Russian taxi cab dispatcher lady 30.105 MHz FM
30.1250 MHz FM [CSQ]
30.1500 MHz FM [CSQ] - sporadic QRM from datalink system on 30.155 MHz
30.1750 MHz FM [CSQ] - QRM from military FM comms on frequency
30.1875 MHz FM [CSQ]
30.2000 MHz FM [CSQ] - QRM from odd data signal on 30.1915 MHz or 30.190 MHz or 30.192 MHz?
30.2125 MHz FM [CSQ]
30.2250 MHz FM [CSQ] - QRM from Canadian hospital paging systems on 30.220 MHz FM
30.2500 MHz FM [CSQ]
30.2750 MHz FM [CSQ]
30.3000 MHz FM [CSQ] - Military users active on frequency
30.3125 MHz FM [CSQ] - Some QRM from shortwave broadcast harmonic? 30.310 MHz AM
30.3250 MHz FM [CSQ]
30.3375 MHz FM [CSQ]
30.3500 MHz FM [CSQ]
30.3750 MHz FM [CSQ]
30.4000 MHz FM [CSQ] - Military users active on frequency
30.4125 MHz FM [CSQ] - Frequent QRM from Russian () land mobile system on 30.41 MHz
30.4250 MHz FM [CSQ]
30.4375 MHz FM [CSQ]
30.4500 MHz FM [CSQ] - QRM from strong U.S. military use of 30.45 MHz FM
30.4625 MHz FM [CSQ]
30.4750 MHz FM [CSQ]
30.4875 MHz FM [CSQ]
30.5000 MHz FM [CSQ] - QRM from Arabic speaking stations, UNID location
30.5125 MHz FM [CSQ]
30.5250 MHz FM [CSQ]
30.5375 MHz FM [CSQ]
30.5500 MHz FM [CSQ]
30.5625 MHz FM [CSQ]
30.5750 MHz FM [CSQ] - QRM from 30.580 MHz business comms + military comms on 30.575 MHz
30.5750 MHz - END U.S. MILITARY PRIMARY ALLOCATION BAND 30.0 - 30.575 MHz
30.5800 MHz - BEGIN U.S. LAND MOBILE  PRIMARY ALLOCATION 20 kHz STEPS TO 31.980 MHz
30.5875 MHz FM [CSQ] - slight QRM from LMR business comms on 30.580 MHz FM
30.6000 MHz FM [CSQ] - Russian military QRM 30.6 MHz FM 30.604 MHz 30.605 MHz CW Morse code net
30.6250 MHz FM [CSQ]
30.6375 MHz FM [CSQ] - Active U.S. business band system on 30.64 MHz FM, sometimes extreme QRM
30.6500 MHz FM [CSQ] - frequent QRM due to military use of 30.65 MHz FM
30.6625 MHz FM [CSQ] - QRM from/to U.S. LMR systems on 30.66 MHz FM
30.6750 MHz FM [CSQ]
30.6875 MHz FM [CSQ]
30.7000 MHz FM [CSQ] - QRM from military users mil comms 30.70 MHz
30.7125 MHz FM [CSQ] - some QRM from US LMR Part 90 comms on 30.72 MHz FM
30.7250 MHz FM [CSQ] - Several U.S. LMR systems active on 30.720 MHz FM
30.7375 MHz FM [CSQ] - QRM due to active U.S. LMR system on 30.740 MHz FM
30.7500 MHz FM [CSQ] - QRM from military comms on 30.75 MHz, plus business comms on 30.74 MHz and 30.76 MHz
30.7625 MHz FM [CSQ] - U.S. Business users on 30.760 MHz FM, often pretty pronounced QRM
30.7750 MHz FM [CSQ]
30.7875 MHz FM [CSQ]
30.8000 MHz FM [CSQ] - QRM from UNID miliary users, likely IDF
30.8125 MHz FM [CSQ]
30.8250 MHz FM [CSQ] - U.S. business band users on 30.840 MHz, some severe QRM 30.82 MHz
30.8375 MHz FM [CSQ] - active U.S. business band users on 30.840 MHz, some severe QRM 30.85 MHz
30.8500 MHz FM [CSQ] - active U.S. business band users on 30.840 MHz, some severe QRM 30.85 MHz
30.8625 MHz FM [CSQ]
30.8750 MHz FM [CSQ] - QRM from military users, incl. Russian mil, plus POCSAG paging signals and 30.88 MHz
30.8875 MHz FM [CSQ] - some QRM from U.S. business users on 30.880 MHz FM
30.9000 MHz FM [CSQ] - some QRM from POCSAG paging signals on 30.9 MHz
30.9125 MHz FM [CSQ]
30.9250 MHz FM [CSQ]
30.9375 MHz FM [CSQ] - QRM from U.S. business comms on 30.940 MHz FM
30.9500 MHz FM [CSQ]
30.9750 MHz FM [CSQ]
30.9875 MHz FM [CSQ]
31.0000 MHz FM [CSQ] - frequent QRM from military comms on frequency 31.000 MHz FM
31.0250 MHz FM [CSQ]
31.0375 MHz FM [CSQ]
31.0500 MHz FM [CSQ]
31.0625 MHz FM [CSQ] - QRM from/to US LMR activity on 31.060 MHz FM
31.0750 MHz FM [CSQ]
31.0875 MHz FM [CSQ]
31.1000 MHz FM [CSQ] - QRM from military comms on frequency + U.S. land mobile users on 31.1 MHz
31.1125 MHz FM [CSQ]
31.1250 MHz FM [CSQ] - frequent QRM from U.S. business radio comms on 31.120 MHz FM
31.1500 MHz FM [CSQ] - frequent QRM from Greek paging system on 31.15 MHz and/or military comms on freq
31.1625 MHz FM [CSQ]
31.1750 MHz FM [CSQ]
31.2000 MHz FM [CSQ] - often severe QRM with 31.200 MHz [203.5 Hz PL] taxi cab dispatcher on frequency
31.2125 MHz FM [CSQ]
31.2250 MHz FM [CSQ]
31.2375 MHz FM [CSQ] - with QRM from and causing QRM to U.S. land mobile business comms on 31.240 MHz FM
31.2750 MHz FM [CSQ]
31.3000 MHz FM [CSQ]
31.3125 MHz FM [CSQ] - QRM to/from UNID voice comms on 31.313 MHz USB
31.3250 MHz FM [CSQ] - with QRM from EPAR datalink on 31.325 MHz and paging signals on 31.320 MHz FM
31.3500 MHz FM [CSQ] - military use of this frequency
31.3750 MHz FM [CSQ] - QRM from/to possible Russian military radio net on 31.380 MHz USB
31.3875 MHz FM [CSQ] - QRM from/to possible Russian military radio net on 31.380 MHz USB
31.4000 MHz FM [CSQ]
31.4125 MHz FM [CSQ]
31.4250 MHz FM [CSQ] - with QRM from EPAR datalink system out of France
31.4375 MHz FM [CSQ] - Frequent QRM, U.S. LMR business activity on 31.440 MHz FM
31.4500 MHz FM [CSQ]
31.4625 MHz FM [CSQ] - with QRM from EPAR datalink system out of France
31.4750 MHz FM [CSQ] - with QRM from EPAR datalink system out of France
31.4875 MHz FM [CSQ] - with QRM from EPAR datalink system out of France
31.5000 MHz FM [CSQ] - QRM from frequent "chirpy" data bursts and FM military comms 31.5 MHz FM
31.5250 MHz FM [CSQ]
31.5375 MHz FM [CSQ] - QRM to/from U.S. LMR networks on 31.540 MHz FM
31.5500 MHz FM [CSQ]
31.5625 MHz FM [CSQ]
31.5750 MHz FM [CSQ] - with heavy QRM from "chirper" carrier on 31.575 MHz
31.6000 MHz FM [CSQ]
31.6125 MHz FM [CSQ]
31.6250 MHz FM [CSQ] - very busy
31.6375 MHz FM [CSQ]
31.6500 MHz FM [CSQ]
31.6625 MHz FM [CSQ]
31.6750 MHz FM [CSQ]
31.6875 MHz FM [CSQ] - with QRM from EPAR datalink system out of France
31.7000 MHz FM [CSQ]
31.7125 MHz FM [CSQ]
31.7250 MHz FM [CSQ] - with QRM from POCSAG paging signals out of the UK
31.7375 MHz FM [CSQ] - QRM from U.S. LMR traffic on 31.740 MHz FM
31.7500 MHz FM [CSQ] - with QRM from POCSAG paging signals out of the UK
31.7625 MHz FM [CSQ]
31.7750 MHz FM [CSQ] - with QRM from POCSAG paging signals out of the UK
31.7875 MHz FM [CSQ]
31.8000 MHz FM [CSQ] - very busy, sporadic US LMR QRM
31.8125 MHz FM [CSQ]
31.8250 MHz FM [CSQ] - with QRM from U.S. land mobile systems on 31.820 MHz FM
31.8500 MHz FM [CSQ]
31.8625 MHz FM [CSQ] - QRM with U.S. LMR systems on 31.86 MHz FM
31.8750 MHz FM [CSQ]
31.9000 MHz FM [CSQ] - QRM with military users, also U.S. LMR systems on 31.900 MHz Fm
31.9125 MHz FM [CSQ]
31.9250 MHz FM [CSQ] - with QRM from EPAR datalink system out of France
31.9375 MHz FM [CSQ] - QRM with U.S. LMR business comms on 31.94 MHz FM
31.9500 MHz FM [CSQ] - Military users on frequency, IDF and many others
31.9625 MHz FM [CSQ] - QRM with U.S. LMR business comms on 31.96 MHz FM
31.9750 MHz FM [CSQ] - with QRM from EPAR datalink system out of France
31.9800 MHz - END U.S. LAND MOBILE PRIMARY ALLOCATION 30.58 MHz - 31.98 MHz 20kHz STEPS
32.0000 MHz - BEGIN U.S. MILITARY PRIMARY ALLOCATION 25 kHz STEPS TO 33.0 MHz
32.0000 MHz FM [CSQ] - QRM - popular military frequency 32.0 FM
32.0125 MHz FM [CSQ]
32.0250 MHz FM [CSQ]
32.0375 MHz FM [CSQ]
32.0500 MHz FM [CSQ]
32.0625 MHz FM [CSQ]
32.0750 MHz FM [CSQ]
32.0875 MHz FM [CSQ] - interference from data bursts on/near frequency
32.1000 MHz FM [CSQ] - IDF and other military tactical radio use noted
32.1125 MHz FM [CSQ]
32.1250 MHz FM [CSQ]
32.1375 MHz FM [CSQ]
32.1750 MHz FM [CSQ] - QRM from Costa Rica - taxi cab dispatch 32.18 MHz 77.0Hz 141.3Hz
32.1875 MHz FM [CSQ]
32.2000 MHz FM [CSQ]
32.2125 MHz FM [CSQ]
32.2250 MHz FM [CSQ]
32.2375 MHz FM [CSQ]
32.2500 MHz FM [CSQ]
32.2750 MHz FM [CSQ]
32.3000 MHz FM [CSQ] - sporadic QRM with various military comms systems 32.30 MHz FM
32.3125 MHz FM [CSQ]
32.3250 MHz FM [CSQ] - military use of this frequency 32.325 MHz FM
32.3375 MHz FM [CSQ]
32.3500 MHz FM [CSQ]
32.4000 MHz FM [CSQ]
32.4625 MHz FM [CSQ]
32.5000 MHz FM [CSQ]
32.5125 MHz FM [CSQ]
32.5375 MHz FM [CSQ]
32.5500 MHz FM [CSQ]
32.5875 MHz FM [CSQ] - Russian military CW radio beacon 32.585 MHz 32.587 MHz single letter beacon "S"
32.6000 MHz FM [CSQ]
32.6250 MHz FM [CSQ]
32.6500 MHz FM [CSQ]
32.6750 MHz FM [CSQ]
32.6875 MHz FM [CSQ]
32.7000 MHz FM [CSQ] - QRM from/to military users, FM clear voice and secure encrypted comms
32.7125 MHz FM [CSQ]
32.7500 MHz FM [CSQ] - frequent secure voice (military) X-mode signals on this frequency
32.8000 MHz FM [CSQ]
32.8500 MHz FM [CSQ]
32.8750 MHz FM [CSQ] - Calling channel
32.9000 MHz FM [CSQ] - QRM from military comms
32.9125 MHz FM [CSQ]
32.9375 MHz FM [CSQ] - QRM from Costa Rican taxi cab dispatcher on 32.940 MHz FM
32.9500 MHz FM [CSQ] - QRM from Costa Rica - taxi cab dispatch 32.94 MHz 77.0Hz 141.3Hz
32.9750 MHz FM [CSQ]
33.0000 MHz - END U.S. MILITARY PRIMARY ALLOCATION BAND 32-33 MHz
33.0000 MHz FM [CSQ] - Fax data stream often active on frequency at the same time
33.0125 MHz FM [CSQ] - QRM from/to U.S. LMR networks operating on 33.020 MHz FM
33.0200 MHz - BEGIN U.S. LAND MOBILE  PRIMARY ALLOCATION 20 kHz STEPS TO 33.980 MHz
33.0250 MHz FM [CSQ] - QRM from/to U.S. LMR networks operating on 33.020 MHz FM
33.0625 MHz FM [CSQ] - QRM with U.S. LMR networks on 33.060 MHz FM
33.0750 MHz FM [CSQ]
33.1000 MHz FM [CSQ] - Calling channel, QRM from U.S. land mobile comms on 33.1 MHz
33.1125 MHz FM [CSQ]
33.1250 MHz FM [CSQ] - QRM with U.S. LMR systems on 33.120 MHz FM
33.1375 MHz FM [CSQ]
33.1750 MHz FM [CSQ] - QRM from U.S. LMR systems on 33.180 MHz FM
33.2000 MHz FM [CSQ] - QRM from/to U.S. LMR on 33.2 MHz FM, military users on 33.200 MHz FM
33.2125 MHz FM [CSQ]
33.2250 MHz FM [CSQ] - Calling channel
33.2375 MHz FM [CSQ]
33.2500 MHz FM [CSQ]
33.2750 MHz FM [CSQ] - Calling channel
33.2875 MHz FM [CSQ]
33.3000 MHz FM [CSQ] - QRM from/to military users, U.S. LMR/PMR 33.300 MHz
33.3125 MHz FM [CSQ]
33.3250 MHz FM [CSQ] - QRM 33.320 MHz FM U.S. land mobile comms
33.3375 MHz FM [CSQ] - QRM 33.340 MHz FM U.S. land mobile comms
33.3750 MHz FM [CSQ]
33.4000 MHz FM [CSQ] - Military use of this freq, Russian mil - tactical data link AKKORD
33.4250 MHz FM [CSQ] - LMR use, Cuban PMR, also military use and 33.420 MHz U.S. fixed links 33.42MHz
33.4500 MHz FM [CSQ] - QRM from 33.45 MHz FM military and 33.44 MHz FM / 33.46 MHz FM U.S. fire
33.4750 MHz FM [CSQ] - QRM from 33.480 MHz fire rescue comms
33.4875 MHz FM [CSQ] - QRM from 33.480 MHz fire rescue comms
33.5000 MHz FM [CSQ] - Military use of this frequency for tactical data link, including AKKORD (Russian mil)
33.5250 MHz FM [CSQ] - Adjacent frequency interference see 33.520 MHz FM
33.5500 MHz FM [CSQ] - Military use of this frequency for tactical data link, including AKKORD (Russian mil)
33.5625 MHz FM [CSQ] - 33.56 MHz U.S. fire departments
33.5750 MHz FM [CSQ] - 5 kHz away from 33.580 MHz FM
33.6000 MHz FM [CSQ] - Military use - Russian military, also U.S. fire depts 33.6 MHz 33MHz band
33.6250 MHz FM [CSQ] - Military use, IDF and others, also 5 kHz away from 33.620 MHz FM US Fire/EMS
33.6500 MHz FM [CSQ] - QRM with military comms, also U.S. fire/rescue on 33.64 MHz and 33.66 MHz FM
33.6625 MHz FM [CSQ] - Severe QRM due to U.S. Fire/EMS dispatch systems on 33.660 MHz FM
33.7000 MHz FM [CSQ] - U.S. LMR - Fire/Rescue comms active on this freq 33.7 MHz
33.7125 MHz FM [CSQ] - U.S. Fire departments 33.700 MHz FM 33.720 MHz FM
33.7500 MHz FM [CSQ] - QRM: data bursts, U.S. fire dept comms 33.740 MHz and 33.760 MHz FM
33.8000 MHz FM [CSQ] - QRM w/ fire and rescue comms, plus data packet bursts UNID source
33.8500 MHz FM [CSQ] - QRM w/data packet bursts UNID source, U.S. LMR on 33.84 MHz and 33.860 MHz
33.8625 MHz FM [CSQ] - Significant QRM with U.S. fire rescue dispatch systems on 33.86 MHz FM
33.9000 MHz FM [CSQ] - U.S. Fire depts, also data bursts from unknown QTH, also miliary use of 33.9 MHz FM
33.9250 MHz FM [CSQ] - QRM from/to U.S. LMR fire/rescue on 33.920 MHz FM
33.9375 MHz FM [CSQ] - QRM from/to U.S. LMR fire/rescue on 33.940 MHz FM
33.9750 MHz FM [CSQ] - QRM from/to U.S. LMR fire/rescue on 33.980 MHz FM
33.9800 MHz - END U.S. LAND MOBILE  PRIMARY ALLOCATION 33.02 MHz - 33.98 MHz
34.0000 MHz - BEGIN U.S. MILITARY PRIMARY ALLOCATION 25 kHz STEPS TO 35.0 MHz
34.0000 MHz FM [CSQ] - QRM, military users active on this frequency
34.0250 MHz FM [CSQ] - QRM Turkey - Turkish LMR 34MHz forestry radio network
34.0375 MHz FM [CSQ] - QRM Turkey - Turkish LMR 34MHz forestry radio network
34.0500 MHz FM [CSQ] - QRM military comms, also Turkish LMR 34MHz forestry radio network
34.0625 MHz FM [CSQ] - QRM Turkey - Turkish LMR 34MHz forestry radio network
34.1000 MHz FM [CSQ] - QRM military comms, also Turkish LMR 34MHz forestry radio network
34.1125 MHz FM [CSQ] - QRM Turkey - Turkish LMR 34MHz forestry radio network
34.1500 MHz FM [CSQ] - QRM military comms, also Turkish LMR 34MHz forestry radio network

4

10/11 meters / FM CB Radio Signals - Channel 18FM 27.175 MHz FM - Latin American 18 Sept 2024

« on: September 18, 2024, 1817 UTC »

Received locally via a handheld CB transceiver, PNI Escort HP 82.

Strong Spanish language chatter in FM mode.  CB radio channel 18 FM, 27.175MHz FM 27175 kHz FM.  Some QRM from AM signals underneath the FM signals, but the capture effect is doing its thing.

QSO on-going at 1815 UTC.  OM talking about his Galaxy radio, model DX 98, QSO switched to OMs talking about band conditions on 20 metros (20 meters) at 1817 UTC. 

5

10/11 meters / 26-28 MHz Paging Signals + Taxis Heard Via W3HFU SDR 18 September 2024

« on: September 18, 2024, 1814 UTC »

W3HFU SDR:
900 foot sky loop antenna
tune in time: 1800 UTC / 1400 local time
09/18/2024 - 18 Sept 2024 18.09.2024

26.695 MHz FM - UK hospital paging frequency - numerous polytone CCIR and POCSAG paging signals 26695 kHz
26.705 MHz FM - Sporadic paging signals noted, UK and European paging frequency 26.7 MHz offset
26.745 MHz FM - UK hospital paging frequency - numerous polytone CCIR and POCSAG paging signals 26745 kHz
26.785 MHz FM - POCSAG and CCIR 5-tone paging signals noted on frequency, not as busy as 26695 or 26745
26.835 MHz FM - UK paging frequency, weak paging pager bursts noted

For whatever reason, UK FM CB is not coming in.  However, the Latin American taxi cab dispatchers are coming in the same chunk of spectrum:

25.695 MHz AM - Mexican taxi cab radio dispatch, strong signal at 1808 UTC
25.865 MHz AM - Taxi radio dispatch, Spanish language, likely Mexico
25.875 MHz AM - Severe QRM from freebanders on 25875 LSB
25.925 MHz AM - Taxi cab dispatch, fair to weak
25.945 MHz AM - Taxi cab radio dispatcher, YL female dispatcher
26.035 MHz AM - Mexican taxi cab radio dispatch, previously logged
26.115 MHz AM - Taxi cab radio dispatch, Spanish speaking lady, alphanumeric taxi cab IDs heard
26.145 MHz AM - Taxi radio dispatch, Spanish language, likely Mexico
26.165 MHz AM - Taxi radio dispatch, Spanish language, likely Mexico
26.335 MHz AM - taxi dispatcher comms, YL, with end of transmission burst, numeric taxi IDs
26.505 MHz AM - Taxi cab radio dispatcher, Spanish language, female dispatcher SS YL taxis
26.655 MHz AM - Two OMs talking, very strong signals
26.755 MHz AM - Taxi cab radio dispatcher, Spanish language, female dispatcher SS YL taxis
26.765 MHz AM - very good signal, the "usual suspect" on this frequency 26765kHz 26.7650MHz AM
26.825 MHz AM - Taxi cab radio dispatch, QRM from 26.830 MHz LSB
26.925 MHz AM - Taxi cab radio dispatch, Spanish language - Mexico
26.935 MHz AM - Taxi cab dispatch comms, female dispatcher, heavy fading
27.755 MHz AM - YL dispatcher with long-short-short-short tone burst end of transmission, good to strong signal
27.765 MHz AM - Taxi cab dispatch lady, Mexican Spanish, previously logged
27.785 MHz AM - Mexican taxi cab radio comms, no QRM from 27.781 FM UK FM CB channel 19
27.865 MHz AM - Taxi cab radio dispatcher, Spanish language, female dispatcher SS YL taxis
27.885 MHz AM - Taxi cab radio dispatcher, Spanish language, female dispatcher SS YL taxis
27.915 MHz AM - Taxi cab radio dispatcher, Spanish language, female dispatcher SS YL taxis

6

10/11 meters / Re: Mobitex 1200

« on: September 18, 2024, 1744 UTC »

Interesting, I know there are often "pulse" transmissions on these frequencies, especially 32.325 MHz.  Apparently some of them are coming out of Syria, and have the nickname the Syrian Pulse.

Lots of over the horizon radar OTH radar systems on/around these frequencies too. 

7

10/11 meters / 30.000 MHz LSB 30000 kHz LSB UNID Portuguese? Comms 18 September 2024

« on: September 18, 2024, 1742 UTC »

Via G8JNJ SDR, first noted because there are/were also Asian fishermen chattering away on 30.000 MHz FM and there's a carrier on 29999.35 kHz.

These guys are on 30000.0 kHz LSB.  30.000.0 MHz LSB lower side band, actually, 29999.9 kHz sounds a bit better.  So maybe they're just using the highest frequency their radios can go to?  I've noted guys using 30.000 MHz USB before, but this is unique.  29.999.9 MHz 29,999.9 kHz 29999.9 kHz LSB chatter.  Likely freebanders.  Pretty severe QRM from the fishery radio chatter on 30.0000 MHz FM [CSQ] and due to the various carriers on/around 30.000 MHz.

8

10/11 meters / Asian Fishermen 27.5-39.5 MHz FM Logs [Via G8JNJ SDR] 18 September 2024

« on: September 18, 2024, 1739 UTC »

1730 UTC
18 September 2024

Via G8JNJ SDR receiver:

27.725 MHz FM
27.750 MHz FM
27.875 MHz FM
27.900 MHz FM
27.950 MHz FM
27.975 MHz FM
28.050 MHz FM
28.150 MHz FM with QRM from 28.155 MHz FM and 28.145 MHz AM and FM!
28.825 MHz FM
28.875 MHz FM
28.925 MHz FM
29.100 MHz FM
29.175 MHz FM - active around 1732 UTC, sounds like Japanese
29.225 MHz FM
29.350 MHz FM
29.575 MHz FM
29.775 MHz FM
29.825 MHz FM
29.850 MHz FM
29.875 MHz FM - very active, probably the busiest frequency
29.925 MHz FM - activity first noted around 1731 UTC
30.000 MHz FM - active, with QRM from carrier and 30.000 MHz LSB chatter
30.025 MHz FM - QRM from weak POCSAG paging signals 30.020 MHz 30.022 MHz Canadian hospitals
30.100 MHz FM
30.125 MHz FM
30.350 MHz FM
30.500 MHz FM
31.175 MHz FM
31.200 MHz FM

1745 UTC - 1755 UTC

27.600 MHz FM - very severe QRM from freeband CB and UK FM CB channel 1 freq 27.60125 MHz FM
27.900 MHz FM
28.775 MHz FM
28.925 MHz FM
29.100 MHz FM
29.175 MHz FM - the most active frequency within the 10 meter band at the moment
29.550 MHz FM
29.750 MHz FM
29.800 MHz FM
29.825 MHz FM
29.875 MHz FM
29.900 MHz FM
29.925 MHz FM
30.000 MHz FM - with severe QRM from the 29.9999 MHz LSB 30.0000 MHz LSB signals on frequency
30.775 MHz FM
30.800 MHz FM
31.000 MHz FM
31.175 MHz FM
31.225 MHz FM
31.425 MHz FM - now the busiest frequency
31.800 MHz FM

9

10/11 meters / New 11 Meter CW Beacon 26965 kHz 26.965 MHz CB Channel 1 - 155TW321 Taiwan

« on: September 04, 2024, 1548 UTC »

155TW321 CB radio channel 1 radio propagation beacon 11m beacon 11 meter beacon 27 MHz CB radio beacon CH1 frequency 26.965 MHz

Transmits every 3 minutes, Morse code CW ID 155TW321

Power output: 1 watt
Antenna: wire dipole, 1/2 wave inverted V configuration half wave dipole
Location: Taiwan


Frequency: 26965 kHz 26.965 MHz
CB radio channel 1
CB radio band plan standard CEPT band EU band CE band USA FCC CB band 26.965 MHz - 27.405 MHz band plan


Tune CB radio frequencies on ham radio or general coverage receiver 26.965 MHz

Tune 26.964 MHz USB or 26.963 MHz USB, CW appears to be just below the 26965.0 center frequency - 26964.4 kHz 26964.5 kHz. 

Video of reception by a station in Australia, demonstrating reception of signal on
- an older President Grant export radio (Superstar GR)
- a newer Yaesu FT-950 HF ham rig
- a SDR waterfall display

https://www.youtube.com/watch?v=XvSF4_gBIyI

All credit for the video above goes to 43PR50

10

10/11 meters / Russian Taxi Cabs 25-30 MHz (Via UK Receivers) Compiled Logs

« on: September 04, 2024, 1426 UTC »

Russian taxi cabs, received via SDR receiver located in the UK.  IARU intruder watch calls these CIS taxis, Russian taxis, etc. on 28MHz band.  Note the use of the lower portion of 28 MHz band 10 meter band.  The "standard" export radio coverage is 25.615 MHz to 28.305 MHz.  Note that the legal Russian CB radio band is 26.510 MHz to 27.865 MHz (5 kHz steps, AM, FM and SSB allowed).  I've omitted the 27.050 MHz FM, 27.055 MHz FM, 27.070 MHz FM, 27.100 MHz FM, 27.200 MHz FM and many many other repeaters in use in Russia, including for taxi comms.  27100 kHz FM is very prolific and comes in on a very regular basis.  There appear to be multiple simplex repeaters on 27050 FM, 27055 FM and many others.  27.135 MHz AM 27,135 AM is also very busy.  27.330 MHz FM and 27.335 MHz FM both appear to also have repeaters on them, even though 27330 FM is used for land mobile - taxi cab dispatch) purposes. 


25.615 MHz FM 25615 kHz FM 25,615 FM - Band A Channel 1
https://www.youtube.com/watch?v=IQ0w2LD7gVs

25.635 MHz FM 25635 kHz FM 25,635 FM
https://www.youtube.com/watch?v=tFD1QBnWYZQ

25.865 MHz FM 25865 kHz FM 25,865 FM
https://www.youtube.com/watch?v=Q7AAU4riurY

25.975 MHz FM 25975 kHz FM 25,975 FM
https://www.youtube.com/watch?v=FAvFEe16L3Y

25.985 MHz FM 25985 kHz FM 25,985 FM
https://www.youtube.com/watch?v=dEzPy8TZ044

26.115 MHz FM 26115 kHz FM 26,115 FM
https://www.youtube.com/watch?v=DvPHpn6Wiic

26.115 MHz FM 26115 kHz FM 26,115 FM
https://www.youtube.com/watch?v=Z6rOXjOW_Rg

26.155 MHz FM 26155 kHz FM 26,155 FM
https://www.youtube.com/watch?v=DvPHpn6Wiic

26.175 MHz FM 26175 kHz FM 26,175 FM
https://www.youtube.com/watch?v=3HxsYY_Si_E

26.240 MHz FM 26240 kHz FM 26,240 FM
https://www.youtube.com/watch?v=-7YudrdfV_s

26.285 MHz FM 26285 kHz FM 26,285 FM
https://www.youtube.com/watch?v=apYcnNhRIUc

26.375 MHz FM 26375 kHz FM 26,375 FM
https://www.youtube.com/watch?v=cdov9Or5KSY

26.510 MHz FM 26510 kHz FM 26,510 FM
https://www.youtube.com/watch?v=-e18t6q0OAo

26.510 MHz FM  26510 kHz FM 26,510 FM
https://www.youtube.com/watch?v=d2kGT4Z1XPc

26.535 MHz FM 26535 kHz FM 26,535 FM
https://www.youtube.com/watch?v=mS3UftW8q3M

26.560 MHz FM 26560 kHz FM 26,560 FM
https://www.youtube.com/watch?v=fIJZ1jH-ALw

26.705 MHz FM 26705 kHz FM 26,705 FM
https://www.youtube.com/watch?v=8uQ_B4cGtRw

26.895 MHz FM 26895 kHz FM 26,895 FM
https://www.youtube.com/watch?v=_QoSXBdtuWY

26.895 MHz FM 26895 kHz FM 26,895 FM
https://www.youtube.com/watch?v=sshVqDchhqU

27.330 MHz FM 27330 kHz FM 27,330 FM CB radio channel 33R 33P
https://www.youtube.com/watch?v=LVNAVcPlZxU

27.330 MHz FM 27330 kHz FM 27,330 FM CB radio channel 33R 33P
https://www.youtube.com/watch?v=K8jmXD00rhA

27.330 MHz FM 27330 kHz FM 27,330 FM CB radio channel 33R 33P
https://www.youtube.com/watch?v=MfvYC94VHdc

27.425 MHz FM 27425 kHz Fm 27,425 FM
https://www.youtube.com/watch?v=egTMsZzoNVQ

27.430 MHz FM 27430 kHz FM 27,430 FM
https://www.youtube.com/watch?v=tl57M7y3c7o

27.655 MHz FM with QRM from fishing boat chatter comms on 27.650 MHz FM:
https://www.youtube.com/watch?v=jz_B6omfBf0

27.695 MHz FM 27695 kHz FM 27,695 FM
https://www.youtube.com/watch?v=GSf3c44nciQ

27.735 MHz FM 27735 kHz FM 27,735 FM
https://www.youtube.com/watch?v=OyMLpRCzmC4

27.735 MHz FM 27735 kHz FM 27,735 FM
https://www.youtube.com/watch?v=0Z-4EDUAtTU

27.805 MHz FM 27805 kHz FM 27,805 FM
https://www.youtube.com/watch?v=5gLzjca9iPs

27.805 MHz FM 27805 kHz FM 27,805 FM
https://www.youtube.com/watch?v=TvXM3xRK6hc

27.815 MHz FM 27815 kHz FM 27,815 FM
https://www.youtube.com/watch?v=W__-QGC3djw

27.865 MHz FM 27865 kHz FM 27,865 FM - Band E Channel 1
https://www.youtube.com/watch?v=9dVwWCoA1Rw

27.865 MHz FM 27865 kHz FM 27,865 FM
https://www.youtube.com/watch?v=xU_pEqbg-S4

27.925 MHz FM 27925 kHz FM 27,925 FM
https://www.youtube.com/watch?v=VFlIbeYRAGY

27.975 MHz FM 27975 kHz FM 27,975 FM
https://www.youtube.com/watch?v=d9uinqAEOv8

28.055 MHz FM 28055 kHz FM 28,055 FM
https://www.youtube.com/watch?v=bZk27RMpoSU

28.115 MHz FM 28115 kHz FM 28,115 FM
https://www.youtube.com/watch?v=jrkC9SN2VWk

28.115 MHz FM 28115 kHz FM 28,115 FM
https://www.youtube.com/watch?v=13vinS05AN8

28.135 MHz FM 28135 kHz FM 28,135 FM
https://www.youtube.com/watch?v=tQ0PJxWs69Y

28.135 MHz FM 28135 kHz FM 28,135 FM
https://www.youtube.com/watch?v=3kA7L5GY_j0

28.155 MHz FM 28155 kHz FM 28,155 FM
https://www.youtube.com/watch?v=Bdn4sZk5-Zs

28.155 MHz FM 28155 kHz FM 28,155 FM
https://www.youtube.com/watch?v=yUQ8QO9hltI

28.195 MHz FM 28195 kHz FM 28,195 FM
FM https://www.youtube.com/watch?v=XCjI-KIRNJk

28.210 MHz FM 28210 kHz FM 28,210 FM
https://www.youtube.com/watch?v=CeZkMHZBb6w

28.215 MHz FM 28215 kHz FM 28,215 FM
https://www.youtube.com/watch?v=31I_WkU4P28

28.225 MHz FM 28225 kHz FM 28,225 FM
https://www.youtube.com/watch?v=jHtGN4IOhWQ

28.245 MHz FM 28245 kHz FM 28245 FM
https://www.youtube.com/watch?v=U6GoheMy4MI

28.245 MHz FM 28245 kHz FM 28245 FM
https://www.youtube.com/watch?v=rRYLb2mYYZU

28.265 MHz FM 28265 kHz FM 28265 FM
https://www.youtube.com/watch?v=gHuPSg6jD98

28.265 MHz FM 28265 kHz FM 28265 FM
https://www.youtube.com/watch?v=uozFO7ok7PU

28.285 MHz FM 28285 kHz FM 28285 FM
https://www.youtube.com/watch?v=bKm5QBEuDsw

29.855 MHz FM 29855 kHz FM 29,855 FM
https://www.youtube.com/watch?v=18AUN-PGigU




There are taxi cabs operating in the portion of 10m above 28.305 MHz / 28.310 MHz / 28.315 MHz, including up through 29 MHz and above (see 29.855MHz below).  Taxi dispatch comms have been logged on 30.025 MHz FM, 30.035 MHz FM, 30.055 MHz FM, 30.075 MHz FM, 30.095 MHz FM, 30.100 MHz FM and 30.105 MHz FM.  The flood of Chinese made export radios that cover 25.615 MHz to 30.105 MHz / 25.610 MHz to 30.110 MHz 30.115 MHz means that the whole 10 meter band is now available, along with the spectrum above it 29 MHz and the very bottom of 30 MHz. 

There are many VHF low band systems in operation as well, including on 38.525 MHz FM, 38.725 MHz FM, 37.225 MHz FM, 37.375 MHz FM, 37.125 MHz FM and other frequencies in the 30-40 MHz region.  25 kHz spacing appears to be the most commonly seen band plan, with the 30-50 MHz systems using CTCSS tone squelch (PL tones) and wider FM deviation. 

11

10/11 meters / 25.575 MHz AM UNID Brazilian Comms Portuguese 30 August 2024

« on: September 04, 2024, 1330 UTC »

Via G8JNJ SDR - located in the UK.  1630 UTC to 1632 UTC.  Frequency 25575 kHz 25,575kHz 25.5750 MHz AM 25575.0 AM

https://www.youtube.com/watch?v=O9M9nzAcogo

Possibly just freebanders, or could be fishing fleets or other users.  Not unheard of to hear 11 meter CB radio free band comms below 25.615 MHz, as many radios start at 24.715 MHz or 25.165 MHz or even 24.265 MHz as their "Band A Channel 1" frequency. 

At the time the guys were chatting away on 25.575 MHz AM, there were numerous other signals from Europe and the Americas coming in on the 25-30 MHz band.  26.225 MHz FM was active, likely with business users land mobile users using export radios,

Back on 23 March 2024, I heard similar traffic on 26.125 MHz AM, possibly also a fishing fleet or other freeband users.  They seem to like the high 25 MHz band and lower part of 26 MHz, but are all over the place, including in the little sliver of spectrum between 29.7 MHz and 30.000 MHz.  Yep, there are land mobile and marine users of those frequencies, not just the 29.710 MHz FM, 29.730 MHz FM, 29.750 MHz FM, 29.770 MHz FM and 29.790 MHz FM FCC Part 90 Business Radio Service frequencies either.   There are taxi cab radio systems on 29.855 MHz FM, 29.905 MHz FM, 29.915 MHz FM, 29.945 MHz FM, 29.965 MHz FM out of Russia, no doubt others are there too.  They're all over 10 meters too. 

12

10/11 meters / Re: UNID 25950 FM 1523 01 SEPT 2024

« on: September 04, 2024, 1322 UTC »

Nice, actually catching audio on the 25.950 MHz STL signal is pretty awesome.  Did you managed to pull a PL tone (CTCSS tone) off it?  I believe during the last sunspot cycle peak (when there seemed to be audio on 25950 FM nearly all the time), they were using 85.4 Hz (it may have been 82.5 Hz or 88.5 Hz).  I know that at that point, 25.910 MHz FM and 25.990 MHz FM were both also on very often.  25910 FM and 25990 FM current status is unknown.

I heard the usual unmodulated FM carrier yesterday 03 September 2024 coming in pretty strong, almost totally quieting my receivers in FM mode (handheld scanners with telescopic CB walkie talkie antennas) at points.  WWV on 25.000 MHz was full scale at the same time. 

13

10/11 meters / 27603.5 CW Beep Every 2 Seconds UNID Beacon?? Via W3HFU SDR 1730 UTC 09/03/2024

« on: September 04, 2024, 1315 UTC »

Received via W3HFU's excellent online receiver.  Link to YouTube video below.  Tune in time: 1729 UTC / 1730 UTC, received 3 September 2024.

Center frequency is 27.603.5 MHz 27603.5 kHz

Tuned in other modes:   

27.605 MHz LSB
27.602 MHz USB
27.605 MHz FM
27.603 MHz USB and so on.

Link to video below:

https://www.youtube.com/watch?v=nqVHZmU740s

14

VHF/UHF Logs, including satellites and radiosondes / VHF UHF Business Comms Logs Richmond VA 30 August 2024

« on: August 30, 2024, 2138 UTC »

Logs
frequencies in MHz.   


466.1375 [67.0 Hz] School, active
464.5500 026 DCS] Construction
461.2125 [88.5 Hz] “around the truck”
464.5500 [82.5 Hz] Crane control, Spanish
462.7250 [136.5 Hz] School
464.5000 [162 DCS] Construction
462.9125 [192.8 Hz] Crane control
467.8500 [74.4 Hz] Crane control
462.5500 [71.9 Hz] Warehouse comms
467.9000 [100.0 Hz] Retail, inventory
151.8200 [127.3 Hz] Hospitality
466.1875 [71.9 Hz] Weak
469.4875 [94.8 Hz] Crane control
464.5500 [103.5 Hz] “Playbook”
151.9550 [94.8 Hz] Weak
467.6375 [67.0 Hz] School? Weak
462.5750 [67.0 Hz] Crane control?
462.8625 [167.9 Hz] Weak, UNID
464.5500 [325 DCS] Construction
467.9250 [67.0 Hz] Security
462.5625 [67.0 Hz] School? very strong
464.5000 [77.0 Hz] “over here, Jay”
462.5750 [141.3 Hz] GMRS repeater keyup
151.8200 [141.3 Hz] Water/sewer work
467.7125 [114 DCS] Building ops
462.6750 [606 DCS] Warehouse/retail
469.5625 [186.2 Hz] Crane control
151.5125 [136.5 Hz] Crane control
464.5000 [612 DCS] “3 inch sprinkle”
457.5250 [315 DCS] School
151.6250 [167.9 Hz] Crane Master
467.8750 [114 DCS] Spanish
462.6500 [CSQ] “Mike, check level 2”
467.5625 [032 DCS] Car to car comms
151.8200 [67.0 Hz] “Elevator 3”
467.7625 [67.0 Hz] Retail
461.2625 [346 DCS] Parking coordination?
467.8500 [179.9 Hz] Weak, UNID
464.5500 [97.4 Hz] Construction
462.6250 [141.3 Hz] GMRS repeater keyup
151.6250 [67.0 Hz] Highway maintenance
462.7000 [146.2 Hz] Spanish
467.6125 [67.0 Hz] FRS call tones
461.2625 [346 DCS] School?
467.8500 [CSQ] Data bursts
467.5875 [026 DCS] “panel 3”
467.7500 [CSQ] Data bursts, paging
154.4900 [67.0 Hz] Highway maintenance
462.8625 [172 DCS] Voice inversion
461.3375 [743 DCS] Construction
462.6625 [88.5 Hz] Security?
467.6625 [CSQ] Elevator work
464.5000 [464 DCS] “he’s gonna take..”
462.6750 [67.0 Hz] “book was took out”
154.5700 [712 DCS] “unit 2” “red cone”
461.2125 [67.0 Hz] “front desk”
467.9000 [203.5 Hz] Spanish
462.7125 [146.2 Hz] “mid day walk”
466.2125 [85.4 Hz] Hotel/hospitality
469.4875 [110.9 Hz] “copy that”
467.7625 [047 DCS] Building maintenance
464.5000 [162.2 Hz] HVAC testing?
462.5875 [025 DCS] Alarm techs
154.6000 [88.5 Hz] Mobile to mobile
462.5750 [223 DCS] Day care?
467.8750 [67.0 Hz] Traffic control
464.5500 [CSQ] Data bursts
462.7250 [CSQ] “depends on what it is”
467.8750 [025 DCS] Maintenance crew
467.8125 [77.0 Hz] Flagmen
151.8800 [110.9 Hz] “where is the…”
462.7125 [77.0 Hz] FRS call tones
469.5000 [026 DCS] Construction
462.5875 [CSQ] Crane control
467.8500 [100.0 Hz] Warehouse ops
462.5500 [123.0 Hz] Weak
464.5000 [179.9 Hz] Hotel front desk
462.6625 [136.5 Hz] Catering
151.8200 [114 DCS] “Come to cafeteria”
464.5500 [103.5 Hz] Construction
462.7250 [252 DCS] Spanish
469.5500 [346 DCS] “level 6” “check”
467.8750 [131.8 Hz] Crane control
462.6875 [114.8 Hz] “shutting down”



151.8200 MHz - MURS 1
151.8800 MHz - MURS 2
151.9400 MHz - MURS 3
154.5700 MHz - MURS 4
154.6000 MHz - MURS 5

462.5625 MHz - FRS 1
462.5875 MHz - FRS 2
462.6125 MHz - FRS 3
462.6375 MHz - FRS 4
462.6625 MHz - FRS 5
462.6875 MHz - FRS 6
462.7125 MHz - FRS 7
467.5625 MHz - FRS 8
467.5875 MHz - FRS 9
467.6125 MHz - FRS 10
467.6375 MHz - FRS 11
467.6625 MHz - FRS 12
467.6875 MHz - FRS 13
467.7125 MHz - FRS 14
462.5500 MHz - FRS 15
462.5750 MHz - FRS 16
462.6000 MHz - FRS 17
462.6250 MHz - FRS 18
462.6500 MHz - FRS 19
462.6750 MHz - FRS 20
462.7000 MHz - FRS 21
462.7250 MHz - FRS 22

151.5050 MHz - Itinerant
151.5125 MHz - Itinerant
151.6250 MHz - Itinerant “Red Dot”
151.6400 MHz - Itinerant
151.7000 MHz - Itinerant
151.7600 MHz - Itinerant
151.9550 MHz - Itinerant “Purple Dot”
154.5275 MHz - Itinerant
158.4000 MHz - Itinerant
158.4075 MHz - Itinerant



More logs 31 August



467.9250 [71.9 Hz]
464.5000 [74.4 Hz]
467.9250 [107.2 Hz]
466.3625 [331 DCS]
462.7625 [203.5 Hz]
467.8500 [047 DCS]
467.9000 [331 DCS]
467.9250 [82.5 Hz]
467.8500 [743 DCS]
464.5500 [67.0 Hz]
461.0875 [88.5 Hz]
464.5500 [107.2 Hz]
464.5500 [025 DCS]
467.8750 [79.7 Hz]
461.1625 [67.0 Hz]
466.2875 [032 DCS]
467.7625 [223 DCS]
461.1125 [172 DCS]
464.5000 [179.9 Hz]
462.5500 [123.0 Hz]
462.7125 [146.2 Hz]
467.9250 [155 DCS]
466.0375 [94.8 Hz]
461.2375 [67.0 Hz]
467.9250 [67.0 Hz]
469.4875 [103.5 Hz]
467.7625 [74.4 Hz]
464.5000 [223 DCS]
462.6250 [127.3 Hz]
467.8125 [315 DCS]
467.9250 [172 DCS]
461.3125 [412 DCS]
464.5500 [223 DCS]
467.9125 [91.5 Hz]
467.8750 [100.0 Hz]
462.5875 [71.9 Hz]
469.5500 [172 DCS]
467.8750 [67.0 Hz]
461.2125 [67.0 Hz]
461.0375 [172 DCS]
464.5500 [466 DCS]
467.7625 [131 DCS]
462.9125 [065 DCS]
467.9250 [210.7 Hz]
462.5875 [118.8 Hz]
467.7500 [115 DCS]
467.7500 [CSQ] Data Paging
467.8500 [67.0 Hz]
467.9250 [74.4 Hz]
467.7750 [072 DCS]
467.9000 [205 DCS]
467.9250 [118.8 Hz]
464.5125 [218.1 Hz]
462.8625 [026 DCS]
467.9250 [246 DCS]
466.1125 [612 DCS]
469.5625 [146.2 Hz]

15

10/11 meters / 26.765 MHz AM 26765 AM Taxi Cabs 11 Meter Band LMR (Via W3HFU SDR) 20 Aug 2024

« on: August 20, 2024, 1355 UTC »

1340 UTC tune in time, started with W3HFU SDR with the 120 foot T2FD antenna.  Tune out time: 1355 UTC.

26765kHz AM out of Mexico very good signal this morning.  Dispatcher YL SS slightly off-frequency 26764.8 kHz close enough to 26765kHz AM taxi cab radio dispatch LMR PMR PLMR land mobile radio business band taxi cab business radio taxi controllers on CB radio 27MHz band.  Alphanumeric and numeric IDs (each taxi has a unique identifier), addresses, phone numbers, streets and other information YL dispatcher with unique multi-tone "Roger Beep" end of transmission.  Relatively quiet band at this time, could be some sporadic-E DX or the beginnings of a bigger opening, TEP type propagation.


Noting some other activity on the 25.615 MHz to 27.995 MHz 25-28 MHz 26-28 MHz band...additional logs below. 

25695 kHz AM 25.695 MHz AM - Taxi dispatch, weak to fair, some SSB chatter in background
25815 kHz AM 25.815 MHz AM - Mexican taxi cab radio chatter, YL dispatch + OM drivers
26035 kHz AM 26.035 MHz AM - Taxi cab radio dispatch, taxi controllers - YL Spanish - Mexico
26075 kHz AM 26.075 MHz AM - Fair to weak, taxi cab dispatcher, YL reading numbers in Spanish over radio
26115 kHz AM 26.115 MHz AM - Taxi cab radio dispatch, taxi controllers - YL Spanish - Mexico or Latin American LMR
26145 kHz AM 26.145 MHz AM - Taxi cab radio dispatch, taxi controllers - YL Spanish - Mexico
26175 kHz AM 26.175 MHz AM - Taxi cab radio dispatch, taxi controllers - YL Spanish - Mexico
26335 kHz AM 26.335 MHz AM - Taxi cab radio dispatch, taxi controllers - YL Spanish - Mexico
26665 kHz AM 26.665 MHz AM - YL taxi dispatch lady, several OMs heard with noise toys
26675 kHz AM 26.675 MHz AM - Taxi cab dispatch, Mexican radio taxi cab, severe QRM from 26.6750 MHz LSB freebanders
26765 kHz AM 26.765 MHz AM - Strong this morning, YL dispatcher with end of transmission tones, OM drivers, see above logs
26935 kHz AM 26.935 MHz AM - Taxi cab radio dispatch, Mexico - previously logged activity on same frequency
27215 kHz AM 27.215 MHz AM - Taxi cab radio dispatch, YL dispatcher - CB Radio Channel 21 AM
27255 kHz AM 27.255 MHz AM - Taxi cab radio dispatch, YL dispatcher - CB Radio Channel 23 AM
27755 kHz AM 27.755 MHz AM - Weak taxi cab dispatch, much stronger SSB signals on 27755 LSB
27785 kHz AM 27.785 MHz AM - YL taxi dispatcher, Spanish language - Mexico taxicab radio dispatch 27,785
27805 kHz AM 27.805 MHz AM - Taxi cab chatter, YL dispatcher, reading numbers in Spanish, very severe QSB / fading
27955 kHz AM 27.955 MHz AM - Taxi cab radio dispatch 27,955 27.955MHz AM Mexican accent SS