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Messages - R4002

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16
Via G8JNJ SDR

1330 UTC - 1340 UTC

28.095 MHz FM
28.100 MHz FM
28.105 MHz FM
28.115 MHz FM
28.125 MHz FM
28.145 MHz FM
28.175 MHz FM
28.185 MHz FM
28.195 MHz FM
28.200 MHz FM
28.210 MHz FM
28.215 MHz FM
28.225 MHz FM
28.245 MHz FM - SIO 555 full quieting very nice FM signal, YL dispatcher, Russian taxis on 28245 FM, heard "Tamara"
28.250 MHz FM
28.255 MHz FM
28.260 MHz FM - Very strong
28.265 MHz FM - Also very strong, heavy QRM from 10m CW signals
28.305 MHz FM
28.325 MHz FM

17
Received via the G8JNJ SDR today.  Unfortunately I was not quick enough to make a video or audio clip.  12.5 kHz offset narrow mode channels. 

Activity noted on

29.9375 MHz FM NFM CSQ 29,937.5 29.937.5 MHz
29.9625 MHz FM NFM CSQ 29,962.5 29.962.5 MHz - some QRM from Russian taxi radio dispatch on 29.965 MHz FM
30.0125 MHz FM NFM CSQ 30,012.5 30.012.5 MHz - with some QRM from POCSAG paging on 30.020 MHz



fisheries radio Asian fishing fleet chatter 27.5-39.5 MHz FM radiotelephone FT801 IC988 IC988B IC988C
fisheries radio Asian fishing fleet radio comms Chinese fishing fleet radio marine VHF HF/VHF dedicated fishery radio
as well as standard 25 kHz spacing frequencies

29.775 MHz FM CSQ 29.7750 MHz FM - very weak signals on 29.770 MHz FM US business radio (minor QRM)
29.825 MHz FM CSQ 29.8250 MHz FM
29.875 MHz FM CSQ 29.8750 MHz FM
29.900 MHz FM CSQ 29.9000 MHz FM - very heavy QRM from POCSAG paging system on same frequency 29.9 MHz
29.975 MHz FM CSQ 29.9750 MHz FM
30.025 MHz FM CSQ 30.0250 MHz FM
30.300 MHz FM CSQ 30.3000 MHz FM
30.350 MHz FM CSQ 30.3500 MHz FM
30.650 MHz FM CSQ 30.6500 MHz FM
30.725 MHz FM CSQ 30.7250 MHz FM
30.750 MHz FM CSQ 30.7500 MHz FM - minor QRM from US LMR signals on 30.740 MHz FM 30.74 MHz and 30.76 MHz
30.775 MHz FM CSQ 30.7750 MHz FM - some minor QRM from 30.76 MHz VHF low band signals
30.800 MHz FM CSQ 30.8000 MHz FM
30.850 MHz FM CSQ 30.8500 MHz FM - minor QRM from land mobile comms on 30.84 MHz FM
30.875 MHz FM CSQ 30.8750 MHz FM - paging signals on frequency POCSAG 30.875 MHz
31.000 MHz FM CSQ 31.0000 MHz FM
31.100 MHz FM CSQ 31.1000 MHz FM - military tactical FM comms and US LMR comms also on frequency 31.1 MHz
31.125 MHz FM CSQ 31.1250 MHz FM
31.200 MHz FM CSQ 31.2000 MHz FM - Latin American taxi radio dispatch and US LMR business comms on freq 31.2 MHz
31.450 MHz FM CSQ 31.4500 MHz FM
31.600 MHz FM CSQ 31.6000 MHz FM - US LMR business radio activity also on this frequency 31.6 MHz
31.625 MHz FM CSQ 31.6250 MHz FM
31.800 MHz FM CSQ 31.8000 MHz FM
32.225 MHz FM CSQ 32.2250 MHz FM
32.900 MHz FM CSQ 32.9000 MHz FM
33.000 MHz FM CSQ 33.0000 MHz FM voice comms plus fax data bursts

18
1300 UTC, strong data stream signals, approx 16 kHz wide, noted on 33.400 MHz and 35.550 MHz.

I’ve monitored strong data link signals on 33.4 MHz previously, including what I believe are Russian air defense network data links target information links for S-300 / SA-10 Grumble or S-400 / SA-21 Growler air defense anti-aircraft missile systems…but could be another military datalink.  Further confusing things is the fact that paging systems are operating on 35.550 MHz and 35.540 MHz, but the signal on 35.5500 MHz is identical to the signal on 33.4000 MHz. 

Lots of other data links all over the VHF low band today.  Lots of what appears to be secure encrypted military voice comms and FM 30-88 MHz tactical voice comms in various languages. 


G8JNJ Receiver


19
26765 AM / 26.765 AM taxi cab radio dispatch lady coming in quite strong on the east coast of the US today 01/29/2024.

20
10/11 meters / Re: 11m Band Activity 29 JAN 2024
« on: January 29, 2024, 2110 UTC »
Good band conditions today.  UK FM channels 14, 15, 19, 29, 30, 31 and others were coming in mid-afternoon on the U.S. East Coast, with UK FM CB channel 19 QRG 27.78125 MHz FM 27.781 MHz FM being basically nonstop.  Mexican taxi cab radio dispatch traffic mixing in with UK FM CB chatter on 27.785 MHz AM mixing with 27.781 MHz FM. 

26.765 MHz AM also very good signal this afternoon (more taxi cab radio dispatch traffic) plus Spanish language chatter all over the band, up above 29.7 MHz.  UNID Spanish language two-way chatter on 31.225 MHz, 31.400 MHz and several other frequencies that fall within a 12.5 kHz / 25 kHz band spacing band plan (vs. the more commonly found 20 kHz spacing for VHF low band).   UNID source, I know that belongs in the VHF low band forum (I already posted about it there).

21
Via G8JNJ SDR receiver at 1505 UTC tune in time.  Callsign Range Operations heard SIO 333, strong FM deviation but very readable.  Tell-tale 150Hz tone squelch hum.

This is interesting because the US East Coast land mobile (Part 90) business systems 31.120 MHz FM, 31.200 MHz FM, 30.920 MHz FM and numerous others, the 33 MHz fire/rescue dispatch frequencies too are coming in, along with Spanish language chatter on 31.225 MHz and several other frequencies (31.400 MHz, 33.425 MHz) that follow both the 20 kHz and 25 kHz channel spacing band plan.   31.225 MHz also with what sounded like Russian military comms.

31.400 MHz FM with Russian military chatter on it at 1511 UTC.  30-33 MHz is very much alive. 

I checked 11 meters and there's tons of Latin American CB and taxi cab dispatch traffic 25-30 MHz, 11 meters and 10 meters.  Way too much stuff to log right now.

EDIT:

Costa Rican taxi cab dispatch - confirmed Costa Rica comms 32.18 MHz FM and 32.94 MHz FM also coming in - taxi cab radio taxi dispatch Alajuela Costa Rica 32MHz band 32.1800 32.9400 

32.180 MHz FM 77.0 Hz PL
32.180 MHz FM 141.3 Hz PL
32.940 MHz FM 77.0 Hz PL
32.940 MHz FM 141.3 Hz PL

22
1300 UTC - via G8JNJ SDR receiver in the UK.  Russian taxi cab radio taxi Moscow - YL dispatcher VHF low band comms 38 MHz band



38.3750 MHz FM - 85.4 Hz PL
38.3750 MHz FM - 100.0 Hz PL
38.5250 MHz FM - 74.4 Hz PL
38.5250 MHz FM - 85.4 Hz PL

23
Hearing fisheries voice radio chatter Asian fishery radio Chinese fishing boat radio 480 channel FM radiotelephone 27.5 MHz - 39.5 MHz 27.500 MHz - 39.475 MHz 25 watt FM 16K0F3E  signals on the G8JNJ SDR on:


29.7750 MHz FM [CSQ]
29.8250 MHz FM [CSQ]
29.8750 MHz FM [CSQ]
29.9000 MHz FM [CSQ] - heavy QRM from POCSAG paging signals on same frequency 29.900 MHz FM
30.1750 MHz FM [CSQ] - very strong signals
30.2750 MHz FM [CSQ]
30.3000 MHz FM [CSQ] - military FM voice and encrypted digital signals on frequency as well
30.5750 MHz FM [CSQ]
30.6250 MHz FM [CSQ]
30.7000 MHz FM [CSQ]
30.7250 MHz FM [CSQ]
30.7500 MHz FM [CSQ]
30.7750 MHz FM [CSQ] - very busy
30.8000 MHz FM [CSQ]
30.8250 MHz FM [CSQ]
30.9250 MHz FM [CSQ] with weak QRM from weak US LMR signals on 30.920 MHz FM and OTHR on 31.0 MHz
31.0000 MHz FM [CSQ] heavy QRM from "horn" sounding over the horizon radar, 100 kHz bandwidth
31.0750 MHz FM [CSQ]
31.1000 MHz FM [CSQ]
31.1250 MHz FM [CSQ]
31.1750 MHz FM [CSQ] - very busy
31.2000 MHz FM [CSQ]
31.2750 MHz FM [CSQ]
31.4000 MHz FM [CSQ]
31.5750 MHz FM [CSQ]
31.8000 MHz FM [CSQ]
31.8500 MHz FM [CSQ]
31.9000 MHz FM [CSQ]
32.2500 MHz FM [CSQ]
32.5500 MHz FM [CSQ]
33.0000 MHz FM [CSQ] Fax / data signals mixing with FM voice comms - Japanese fishery radio network usage
33.0500 MHz FM [CSQ]
33.2000 MHz FM [CSQ]
33.2250 MHz FM [CSQ]
33.3000 MHz FM [CSQ]
33.3500 MHz FM [CSQ]
33.4000 MHz FM [CSQ] - military data link mixing with fishing trawler voice chatter
33.4250 MHz FM [CSQ]
33.5500 MHz FM [CSQ] - mixing with military voice comms on frequency
33.6000 MHz FM [CSQ] - QRM from UNID military comms on frequency
33.8500 MHz FM [CSQ] - voice comms and FSK data bursts on frequency, similar to 33.000 MHz fax or data broadcast

24
Via G8JNJ KiwiSDR.  Noted a decent amount of military comms and data signals in the 30-38 MHz region at 1200 UTC tune-in.  33.550 MHz FM, 33.600 MHz FM, 33.650 MHz FM all active with Russian military comms, IDF and other military comms.  Lots of datalink signals on 35 MHz, 36 MHz and 37 MHz...as well as 33.620 MHz USB (center frequency with this analog scrambler, which uses FSK tones in-band is actually 33.621 MHz or can be tuned in USB mode, 2.7 kHz bandwidth. 

Sounds just like a regular voice inversion scrambling voice signal (or a USB signal tuned in LSB, you get the idea) plus two FSK signals on frequency. 

25
The taxi lady is coming in very strong this afternoon on 26.765MHz AM 26765 kHz AM 26.7650 AM.  I can hear OM drivers replying to her.  At 2020 UTC, YL dispatcher heard replying to OM driver transmission requesting clarification on a pickup location "near the school, near the school."  YL dispatcher's transmitter carrier frequency is pretty close to being right on frequency, 26765.07 kHz or so.  At 2022 UTC an OM with a very long multi-note musical noise toy came on frequency over the dispatcher.

Lots of OTH radar pulses popping up around 26.765 MHz too, plus narrowband FSK bursts around 26.835 MHz. 

26
Yessir, 26900 kHz 26.9 MHz paging system is powerful.  I'm not 100% sure where it is located, but it seems to have several different transmitters operating on that specific 26.900 MHz frequency, as when the band is open there's often various signal strength signals coming in. 

Do you often hear the POCSAG paging systems on 29.800 MHz and 29.900 MHz? 


27
Via UK based SDR.

29.7100 MHz FM - US LMR comms, Spanish language chatter
29.7400 MHz FM - FSK signal
29.7500 MHz FM - POCSAG paging pager signals - sporadic signals
29.7600 MHz FM - FSK signal
29.7650 MHz FM - Russian LMR, probably taxi cab dispatcher YL "Olga"
29.7700 MHz FM - US LMR business comms - Tail end of FM voice transmission
29.7800 MHz FM - FSK signal, continuous
29.7900 MHz FM - US LMR business comms, taxi dispatcher? 
29.8000 MHz FM - POCSAG paging pager system 29.8 MHz 29800 kHz
29.8150 MHz FM - French language, UNID LMR or freeband CB comms?
29.8400 MHz FM - FSK signal
29.8450 MHz FM - Data bursts, 4-5 kHz bandwidth
29.8500 MHz FM - OTH Radar, "horn" sound, 50 kHz bandwidth
29.8700 MHz FM - FSK data signal
29.8850 MHz FM - Data signal, weak
29.9000 MHz FM - POCSAG paging pager system 29.9 MHz 29900 kHz
29.9050 MHz FM - FSK signal
29.9150 MHz FM - Taxi cab radio dispatcher, Russian taxi radio comms YL
29.9550 MHz FM - Weak FM voice comms, land mobile (probably Russians)
29.9650 MHz FM - Taxi cab dispatcher, Russian YL Olga
29.9850 MHz FM - FSK signal
29.9950 MHz FM - FM carrier, weaker than the carrier or carriers on 30.000 MHz
30.0000 MHz FM - FM carrier
30.0000 MHz FM - Chirper signal
30.0000 MHz FM - Weak FM voice comms, probably military going by FM deviation
30.0000 MHz FM - Military FM comms, US military radio checks
30.0050 MHz FM - Russian taxi cab radio dispatcher "Olga"
30.0150 MHz FM - Weak FM voice traffic, LMR (narrowband FM) probably taxi cab or other business using export radios
30.0200 MHz FM - Tail end of CW ID, hospital paging system, Canada pagers 30.02 MHz
30.0250 MHz FM - Military comms, very short duration transmission
30.0350 MHz FM - Taxi cab radio dispatcher, Russian, YL
30.0500 MHz FM - Military FM voice comms (clear voice) - US military air to air? 400Hz hum in background
30.0500 MHz FM - Military FM voice comms - IDF
30.0550 MHz FM - MFSK data bursts, weak
30.0750 MHz FM - Military comms, possibly IDF
30.0950 MHz FM - Taxi cab radio dispatch, Russian taxi cab radio comms
30.1000 MHz FM - POCSAG pager signals, sporadic
30.1000 MHz FM - Military comms, sounds like helicopters, mention of "Crystal 2-2"
30.1050 MHz FM - Taxi cab radio dispatch, Russian language.  YL dispatcher "Olga"
30.1250 MHz FM - Military comms, encrypted secure voice, heavy fading
30.1500 MHz FM - Military chatter, known popular US military frequency
30.1500 MHz FM - US military, air to ground, talking about "Base leg"
30.1550 MHz FM - MFSK data bursts
30.2000 MHz FM - Weak FM voice, heavy FM deviation, likely military
30.2200 MHz FM - Tail end of CW ID, hospital paging system, Canada pagers 30.22 MHz
30.2250 MHz FM - Military FM comms, likely IDF
30.2500 MHz FM - OTH Radar, 60-70 kHz bandwidth, very strong
30.3000 MHz FM - Military comms, US mil, convoy operations
30.3200 MHz FM - Paging signals - UNID source
30.4000 MHz FM - Arabic?  UNID language, likely land mobile
30.4800 MHz FM - POCSAG paging - weak, UNID source
30.5000 MHz FM - Military comms, likely IDF
30.5500 MHz FM - FM military voice comms, UNID language
30.5800 MHz FM - US LMR comms, UNID user, possibly C.W. Wright Contruction KRT982
30.6000 MHz FM - FM military voice comms, UNID language
30.6000 MHz FM - US LMR comms, utility service - possibly water company out of New Jersey
30.6400 MHz FM - US LMR comms
30.6500 MHz FM - Military voice traffic, clear FM voice and then secure mode
30.6800 MHz FM - US LMR comms - dispatcher, dramatic fading
30.7000 MHz FM - US LMR, talking about directions and alternate routes, sounds like mobile to mobile
30.7200 MHz FM - US LMR business radio service - bus or van dispatcher
30.7400 MHz FM - US LMR comms - business - bus dispatch
30.7500 MHz FM - Encrypted military voice chatter
30.7600 MHz FM - US LMR comms - bus / van dispatch
30.7600 MHz FM - US LMR comms, heavy construction or ready mix concrete
30.7800 MHz FM - US LMR comms, CW ID on frequency (no voice heard)
30.8000 MHz FM - Weak LMR two way comms, UNID source
30.8200 MHz FM - US LMR comms, bus / van dispatch
30.8400 MHz FM - US LMR comms, English and Spanish, UNID user
30.8750 MHz FM - Data bursts
30.8750 MHz FM - POCSAG paging pager system
30.8800 MHz FM - US LMR comms, business radio service
30.9000 MHz FM - POCSAG paging pager signals
30.9000 MHz FM - Military FM voice traffic, heavy fading, UNID user
30.9200 MHz FM - US LMR business radio service
30.9600 MHz FM - US LMR business radio chatter
31.0000 MHz FM - OTH Radar - "horn" sound, 100 kHz BW
31.0000 MHz FM - US LMR business radio comms, heavy fading
31.0000 MHz FM - Military FM voice chatter, lots of encrypted traffic
31.0250 MHz FM - Military FM voice - US military 150Hz tone noted
31.0400 MHz FM - US LMR business comms, weak, heavy QRM from OTH radar
31.0500 MHz FM - Military radio - encrypted voice / secure mode
31.0600 MHz FM - US LMR business - dispatch service, van service?
31.0800 MHz FM - US LMR business radio service
31.1000 MHz FM - Caught tail end of a FM voice signal, likely not military
31.1000 MHz FM - Weak LMR business comms, at least two different users on frequency
31.1000 MHz FM - US LMR comms - fire mutual aid radio network 131.8 Hz PL tone
31.1200 MHz FM - US LMR comms, bus dispatch, very strong 100.0 Hz usual user on 31.12 MHz
31.1200 MHz FM - US LMR comms, second group on frequency, sounds like construction company 31.120 MHz FM
31.1250 MHz FM - Military comms, secure voice (digital)
31.1500 MHz FM - Military FM voice activity, mixing with POCSAG paging signals on same frequency
31.1500 MHz FM - POCSAG paging signals - probably Greek pager network 31.15 MHz FM
31.1750 MHz FM - Military comms, mix of secure voice and regular FM
31.2000 MHz FM - US LMR business radio service comms, busy
31.2000 MHz FM - US LMR comms - facilities management or landscaping company
31.2000 MHz FM - Latin American LMR - taxi dispatcher Spanish with MDC1200 burst, 203.5 Hz PL
31.2400 MHz FM - US LMR comms - business - bus dispatcher, good signal
31.2400 MHz FM - US LMR comms, YL dispatcher talking about bringing it back to base
31.3200 MHz FM - Paging signals - POCSAG pager
31.3250 MHz FM - EPAR traffic light control data polytone - French 31 MHz band datalink
31.3600 MHz FM - US LMR comms, UNID user
31.4000 MHz FM - UNID LMR comms, probably US business radio
31.4400 MHz FM - US LMR business - bus or van dispatcher
31.4800 MHz FM - US LMR business radio chatter, UNID user
31.5000 MHz FM - Military FM voice chatter, also lots of encrypted traffic
31.5750 MHz FM - Chirper
31.6000 MHz FM - FM voice military chatter, US mil, unknown location
31.6750 MHz FM - Military comms, secure voice (digital)
31.7000 MHz FM - Spanish language, likely Latin American LMR comms business radio system
31.7250 MHz FM - POCSAG paging, UK hospital pager systems
31.7500 MHz FM - POCSAG paging, UK hospital pager systems
31.7600 MHz FM - US LMR - heavy construction, truck to base dispatcher
31.7750 MHz FM - POCSAG paging, UK hospital pager systems
31.8000 MHz FM - FM military comms, sporadic voice, mostly secure digital voice signals
31.9000 MHz FM - Military FM net, UNID language
31.9200 MHz FM - US LMR - Spanish language chatter
31.9500 MHz FM - Data signals, probably military tactical data link
31.9600 MHz FM - US LMR business radio chatter
32.0000 MHz FM - Data bursts
32.1000 MHz FM - US mil net, radio checks, sounds like range control or similar comms
32.1800 MHz FM - Latin American LMR - Costa Rica taxi cab company 77.0 Hz PL and 141.3 Hz PL
32.2000 MHz FM - Military comms, secure voice mode - strong
32.2250 MHz FM - FM military voice, US or Canadian military
32.3000 MHz FM - US military, range control or similar comms
32.3250 MHz FM - Chirper, S7 to S9 very strong
32.4750 MHz FM - Chirper
32.7500 MHz FM - Military comms, secure voice mode, busy
32.9000 MHz FM - Military comms, possibly US military
32.9400 MHz FM - Latin American LMR - Costa Rica taxi cab company 77.0 Hz PL and 141.3 Hz PL
33.0000 MHz FM - Fax or data stream, probably related to Asian fishery radio networks 27.5 MHz - 39.475 MHz FM
33.0200 MHz FM - US LMR business radio - bus dispatcher
33.0600 MHz FM - US LMR business radio service
33.0800 MHz FM - US LMR business radio chatter - dispatcher
33.1000 MHz FM - US LMR business radio - bus dispatcher
33.2000 FM - Data bursts, similar to those heard on other 33 MHz frequencies
33.3000 MHz FM - Military comms, FM voice, likely IDF
33.3200 MHz FM - US LMR comms, business or public safety user
33.4000 MHz FM - Strong data signals, previously noted on 33.4 MHz and other frequencies
33.4500 MHz FM - US mil, heard "hotel mike uniform"
33.5000 MHz FM - Military comms, very loud FM deviation, UNID langauge
33.5600 MHz FM - US fire rescue dispatch LMR 33MHz fire band
33.5800 MHz FM - US fire rescue dispatch LMR 33MHz fire band
33.6000 MHz FM - POCSAG paging signals, unknown source
33.6400 MHz FM - US fire rescue dispatch LMR 33MHz fire band
33.6800 MHz FM - US fire rescue dispatch LMR 33MHz fire band
33.7000 MHz FM - US fire rescue dispatch LMR 33MHz fire band
33.7400 MHz FM - US fire rescue dispatch LMR 33MHz fire band
33.7500 MHz FM - Data bursts
33.7600 MHz FM - US fire rescue dispatch LMR 33 MHz fire band
33.7800 MHz FM - US fire rescue dispatch LMR 33MHz fire band
33.8000 MHz FM - Data bursts, 16-18 kHz bandwidth
33.8000 MHz FM - US fire rescue dispatch LMR 33MHz fire band
33.8400 MHz FM - Constant data stream, previously noted on 33.4 MHz and other frequencies
33.8600 MHz FM - US fire rescue dispatch LMR 33MHz fire band
33.8800 MHz FM - US fire rescue dispatch LMR 33MHz fire band
33.9000 MHz FM - US fire rescue dispatch LMR 33MHz fire band
33.9200 MHz FM - US fire rescue dispatch LMR 33MHz fire band
33.9400 MHz FM - US fire rescue dispatch LMR 33MHz fire band
33.9600 MHz FM - US fire rescue dispatch LMR 33MHz fire band
33.9800 MHz FM - US fire rescue dispatch LMR 33MHz fire band
34.0500 MHz FM - US military radio checks, 150Hz tone noted
34.1000 MHz FM - US military comms, heavy fading, possibly range control
34.1500 MHz FM - Military FM - unmodulated carrier signal, no voice heard, probably radio checks
34.2250 MHz FM - Military voice comms, FM voice
34.4750 MHz FM - Military comms, probably IDF
34.7000 MHz FM - UNID military FM comms
34.7750 MHz FM - Military FM comms, mixing with secure (encrypted) digital voice
34.8000 MHz FM - Military FM comms - likely IDF
34.8000 MHz FM - Digital signals, identical to those on 34.85 MHz
34.8500 MHz FM - Military data signals, possibly Russian targeting info
34.8500 MHz FM - Digital signals, probably military (see also: 34.8 MHz)
34.9000 MHz FM - Military net, Canadian military possible user
34.9500 MHz FM - Data bursts, similar to those heard on 33 MHz and 35 MHz
34.9750 MHz FM - Data signals, FSK "chirp"
35.0000 MHz FM - Military FM voice, also secure mode
35.0400 MHz FM - US LMR - business band itinerant frequency, sounds like construction crews
35.0400 MHz FM - US LMR - more than one user on 35.04 MHz frequency
35.0500 MHz FM - US mil comms, helicopters or aircraft
35.0600 MHz FM - US LMR - business radio chatter
35.1000 MHz FM - US LMR - ready mix concrete?
35.1000 MHz FM - Military FM voice comms, US military
35.1500 MHz FM - Military net - secure voice
35.2000 MHz FM - Paging
35.2500 MHz FM - FM military signal on frequency, unable to ID language
35.2800 MHz FM - US LMR - business radio - construction dispatch
35.3000 MHz FM - Strong data signals, previously noted on 35.400 MHz
35.3200 MHz FM - US LMR - business radio chatter - bus, van or taxi dispatcher
35.3500 MHz FM - Military FM voice, US mil comms, 400Hz aircraft hum noted
35.3500 MHz FM - Military comms, secure voice mode (data)
35.3500 MHz FM - Data signals, similar to data noted on 33.4 MHz and 35.4 MHz
35.3600 MHz FM - POCSAG paging pager signals
35.4000 MHz FM - Data signals, previously monitored on this frequency
35.4400 MHz FM - Data bursts, weak POCSAG noted in the background
35.4500 MHz FM - Military FM voice, US military
35.4600 MHz FM - POCSAG paging signals pager
35.5000 MHz FM - Military data bursts, datalink and/or secure voice net
35.5400 MHz FM - POCSAG paging signals pager 35 MHz band
35.5400 MHz FM - US LMR - business radio chatter
35.5500 MHz FM - POCSAG paging signals - unknown source
35.5500 MHz FM - Military FM comms, clear voice
35.5500 MHz FM - Military data signals, targeting info or secure voice mode
35.5600 MHz FM - POCSAG paging pager signals 
35.5800 MHz FM - US LMR, weak signals, heavy fading
35.6000 MHz FM - Military data signals, targeting info or secure voice
35.6500 MHz FM - FM military net, IDF? 
35.7000 MHz FM - US LMR, very short transmissions, UNID user
35.7200 MHz FM - US LMR - business radio chatter
35.7400 MHz FM - US LMR - business radio chatter
35.7500 MHz FM - FM military comms - US mil, air to air
35.7600 MHz FM - US LMR, weak two-way radio comms heard
35.7800 MHz FM - US LMR - business radio chatter
35.8000 MHz FM - US LMR - business radio chatter
35.8000 MHz FM - Military data signals, targeting data or secure voice comms
35.8200 MHz FM - US LMR comms, dispatcher heard talking to mobiles
35.8400 MHz FM - US LMR - business radio chatter, maybe highway maintenance?
35.8500 MHz FM - Military FM comms, US military
35.8800 MHz FM - US LMR - business radio chatter
35.9000 MHz FM - US LMR - business radio chatter
35.9000 MHz FM - Military FM voice chatter, likely IDF
35.9200 MHz FM - US LMR, weak comms heard
35.9250 MHz FM - Data bursts, probably military
35.9400 MHz FM - US LMR - business radio chatter
35.9600 MHz FM - US LMR - business radio chatter
35.9800 MHz FM - US LMR - business radio system
36.0500 MHz FM - Weak voice comms, probably land mobile, UNID
36.1000 MHz FM - Military FM voice, possibly range control, US military
36.1250 MHz FM - Military data signals
36.1750 MHz FM - Weak military FM signals
36.2500 MHz FM - Data signals, likely military data link, previously monitored on/near this frequency
36.3000 MHz FM - FM military comms, 150 Hz tone, probably US military
36.3250 MHz FM - Chirper
36.3250 MHz FM - Data bursts, tell-tale "BUZZ" 16-18 kHz bandwidth
36.4000 MHz FM - Data bursts, similar to those noted on 33 MHz and 35 MHz
36.4250 MHz FM - Chirper, strong, off the air at 1447 UTC
36.4250 MHz FM - UNID voice comms underneath the FM chirp signal, Russian LMR?
36.4750 MHz FM - MFSK 5-frequency data bursts, SCADA?  narrowband signal
36.4750 MHz FM - Russian taxi cab radio dispatch, very weak
36.5000 MHz FM - Latin American LMR - taxi cab dispatcher, known user of this frequency 74.4 Hz PL
36.5250 MHz FM - Russian LMR - taxi cab radio dispatcher
36.6500 MHz FM - Data bursts, likely military secure voice or targeting link tactical data link
36.7500 MHz FM - Data signals, likely secure voice mode (military radio net)
36.9000 MHz FM - Military FM comms, IDF (likely) heavy fading
36.9250 MHz FM - Military FM radio comms, unsure of language, 150 Hz tone
37.0000 MHz FM - MFSK data bursts, UNID source
37.0200 MHz FM - US LMR - Police dispatch, 146.2 Hz PL
37.1000 MHz FM - Military FM signal noted, UNID user or source
37.1000 MHz FM - US military range control, weak

28
Great band opening indicators, 32.18 MHz and 32.94 MHz   VHF low band DX lowband VHF list early warning DX 28MHz 25-50 MHz.  These two frequencies are unique in that they are not within the US land mobile (LMR, Part 90) sub-bands of VHF low. 

32.1800 MHz FM 77.0Hz PL 77.0 Hz tone
32.1800 MHz FM 141.3Hz PL 141.3 tone
32.9400 MHz FM 77.0Hz PL 77.0 Hz tone
32.9400 MHz FM 141.3Hz PL 141.3 tone

Simplex system, both frequencies use 77.0 Hz and 141.3 Hz tones.  Base to mobile VHF low band system.  Alajuela Costa Rica - confirmed user and location. 

When activity is on these frequencies, the 31.200 MHz [203.5 Hz PL] taxi cab dispatch radio system plus

36.5000 MHz 74.4 Hz PL tone 36.500 MHz FM 36,500  36.5 MHz FM
38.6600 MHz 173.8 Hz PL tone 38.660 MHz FM 38,660 38.66 MHz FM

No doubt there are many others.  Use of 10 kHz spacing / 20 kHz spacing is pretty common.  Some 25 kHz / 12.5 kHz channel offsets noted in South America and the Caribbean (33.425 MHz FM out of Cuba, for example).   36.500 MHz is also used by military users worldwide for voice and data comms.  38.660 MHz is close enough to 38.650 MHz FM and 38.6625 MHz FM as well.    The 32 MHz, 34 MHz, 36 MHz and 38 MHz bands are used by US military and other militaries worldwide.  Use of these frequencies for non military land mobile is pretty common outside the USA.  For example, both the 37 MHz and 38 MHz bands are confirmed to be used by Russian taxi cab radio networks.

Are also often coming in.  The 32.180 MHz and 32.940 MHz taxi cab radio networks are confirmed as being in Costa Rica Costa Rican taxi cab radio radio taxi Alajuela Municipality, Costa Rica.  Alajuela Province Costa Rica

29
10/11 meters / Data Links, Paging Pagers 25-30 MHz [Via G8JNJ SDR]
« on: January 16, 2024, 1336 UTC »
16 January 2024
WORK IN PROGRESS


26.625 MHz FM 26625 kHz FM - Pager systems - POCSAG
26.630 MHz FM

27.450 MHz FM 27450 kHz FM - FM carrier, several data link systems and POCSAG systems on this frequency
27.495 MHz FM 27495 kHz FM
27.505 MHz FM 27505 kHz FM - Wideband 15-18 kHz bandwidth POCSAG paging 27.505 MHz 27.505MHz
27.510 MHz FM 27510 kHz FM - POCSAG paging signals, offset 27.5125 MHz 27.512MHz
27.550 MHz FM 27550 kHz FM - POCSAG pager network paging system
27.600 MHz FM 27600 kHz FM - Pager - sporadic signal 12 kHz BW
27.650 MHz FM 27650 kHz FM - POCSAG pager paging signals
27.650 MHz FM 27650 kHz FM - FM carrier - alarms, low power data links, unknown location
27.700 MHz FM 27700 kHz FM - POCSAG paging pager signals 27,7 MHz
27.720 MHz FM 27720 kHz FM - Paging systems pagers 27.72 MHz FM
27.740 MHz FM 27740 kHz FM - POCSAG paging pager signals - sporadic signal
27.750 MHz FM 27750 kHz FM - POCSAG paging pager systems 27.75 MHz
27.760 MHz FM 27760 kHz FM - Low power alarm and paging systems, Europe - paging signals noted
27.845 MHz FM 27845 kHz FM - Offset paging frequency, see 27848
27.848 MHz FM 27848 kHz FM - Paging POCSAG frequency 27.848 MHz 27.8475 MHz
27.850 MHz FM 27850 kHz FM - POCSAG pager signals, offset frequency - see 27.848 MHz 27.8475 MHz
27.885 MHz FM 27885 kHz FM - POCSAG pager paging signals - narrow and wide band POCSAG
27.890 MHz FM 27890 kHz FM - FSK signals, 27.889 MHz USB
27.900 MHz FM 27900 kHz FM - POCSAG paging pager signals
27.940 MHz FM 27940 kHz FM - Constant "pulsing" MFSK data signal with carrier tone on 27.941 MHz
27.940 MHz FM 27940 kHz FM - POCSAG paging signals on top of pulsing data signal
27.950 MHz FM 27950 kHz FM - Two-carrier FSK RTTY like data signal (27.95 MHz USB)

29.740 MHz FM 29740 kHz FM - FSK signal, 150Hz shift
29.745 MHz FM 29745 kHz FM - MFSK signals, sporadic
29.750 MHz FM 29750 kHz FM - POCSAG paging, sporadic
29.800 MHz FM 29800 kHz FM - POCSAG paging pager systems
29.855 MHz FM 29855 kHz FM - FSK signal, constant
29.878 MHz FM 29878 kHz FM - FSK signal - 29.8783 MHz FSK
29.900 MHz FM 29900 kHz FM - POCSAG paging pager systems

30
26765 AM the taxi lady is coming in nice and strong at 1800 UTC today 01/05/2024.

26.765 MHz frequency 26,765 26.7650 MHz 26.765MHz AM YL taxi dispatcher. 

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