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Messages - R4002

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61
10/11 meters / 26.805 MHz FM Activity 1430 UTC 22 March 2024
« on: March 22, 2024, 1434 UTC »
26.805 MHz FM very much alive this morning (U.S. East Coast). 


62
What are they talking about on 26.735? 

63
26.695 MHz and 26.745 MHz are the strongest at my local receive location as well. 

They're both "offset" frequencies, 26.695 MHz being the offset for 26.700 MHz (26.700 MHz and 26.705 MHz are also used for paging), 26.745 MHz being the offset for 26.750 MHz. 

64
I can hear 26.755, 26.745 and 26.695 locally in Richmond VA using a handheld.

On the W3HFU SDR - specifically the one with the 900 foot sky loop antenna

26.950 MHz FM - Weak paging signals
26.900 MHz FM - Pager signals, POCSAG - barely above the noise
26.855 MHz FM - Pager signal bursts, likely offset freq for 26.85 MHz
26.850 MHz FM - Paging bursts, severe QRM from CB traffic on 26.845 MHz and 26.855 MHz
26.755 MHz FM - POCSAG bursts, sporadic
26.750 MHz FM - POCSAG signals, other data bursts (same data signals noted on 26.65 MHz)
26.745 MHz FM - Constant paging signals, first tuned in around 1600 UTC.  Signal strength increased around 1630 UTC
26.695 MHz FM - Constant pager signals, POCSAG
26.650 MHz FM - Paging bursts, narrow band (4-5 kHz wide BW), similar to some of the signals on 26.750 MHz
26.600 MHz FM - Paging signals noted around 1650 UTC and 1655 UTC
26.500 MHz FM - Constant FM "idle" signal, reminds me of 26.200 MHz and 27.450 MHz (both European paging systems)
26.500 MHz FM - POCSAG paging signals
26.450 MHz FM - POCSAG - narrowband signals, weak to fair at 1650 UTC - 1655 UTC
26.250 MHz FM - POCSAG paging signals, mostly narrowband, sporadic, wide band (12 kHz BW) noted at 1658 UTC
26.200 MHz FM - Constant FM "idle" signal, being sent even when paging transmissions are sent - POCSAG (12 to 14 kHz bandwidth!)

65
They seem to be coming in more frequent this solar cycle, that or I'm simply hearing them more. 

27.635 MHz AM is another popular one (channel 19 up one band, so Band E on most export radios).

I've noticed a fair amount of U.S. based chatter, some of it base stations but most of it mobiles...up in the higher part of the 27.415 MHz - 27.855 MHz band (Band E) and the lower part of the 27.865 MHz - 28.305 MHz band (Band F).  27.885 MHz, 27.905 MHz, 27.915 MHz and 27.925 MHz seem to be the most popular ones. 

The lower channels - 25.615 MHz to 26.955 MHz...lots and lots of U.S. based users, mostly truckers but also random business land mobile users, freebanders and so on.   There's also the popular DX frequencies on the lower channels, below CB radio channel 1.

26.915 MHz AM - Band C Channel 36 - AM calling frequency (alternates: up or down 10 kHz to 26.955, down to 26.515)
26.805 MHz FM - Band C Channel 23 - FM calling frequency
26.715 MHz AM - Band C Channel 17 - AM calling channel DX frequency for Latin America
26.705 MHz AM - Band C Channel 16 - AM calling channel DX frequency for Latin America
26.585 MHz AM - Band C Channel 7 - Mexican truckers / truck drivers (see also: 26.565 MHz, 26.575 MHz, 26.595 MHz)
26.555 MHz LSB - Band C Channel 4 - SSB Calling DX frequency for Spanish language, see also 27.455 MHz USB
26.285 MHz USB - Band B Channel 19 - Alternate calling frequency to 27.555 MHz USB 27.555 USB
26.285 MHz AM - Band B Channel 19 - AM mode, U.S. truckers / truck drivers noted on this frequency
26.225 MHz USB - Band B Channel 14 - SSB activity, Mexico / Latin America
25.835 MHz AM - Band A Channel 19 - US truckers truck drivers, also see 26.285 MHz, 26.735 MHz, 27.635 MHz all AM

Of course there are tons of Latin American users on those frequencies too. 

66
Received locally in Richmond, VA with a PNI Escort HP 82 handheld CB radio with a telescopic whip antenna (Cobra HA-TA). 

https://www.youtube.com/watch?v=pG9v8Jc4NgY

^quick video clip of it.  Very heavy fading.

UK FM CB channel 7, frequency 27.66125 MHz FM 27661 FM CADS WPAS LW07 frequency 27.661 MHz FM


67
26.765 MHz AM - likely Mexico location Mexican taxi cab dispatcher YL "Juanita" coming in nicely at 1940 UTC.  Tuned in earlier at approx 1800 UTC with a SIO 333 signal.  Other taxi cab comms coming in all over the band, as it to be expected:

YL dispatcher - taxi cab company land mobile radio, Spanish language radio taxi for all frequencies below

25.625 MHz AM
25.695 MHz AM
25.795 MHz AM
25.835 MHz AM
25.875 MHz AM
25.945 MHz AM - STL carrier (unmodulated FM signal) on 25.950 MHz coming in with it
25.965 MHz AM
25.995 MHz AM
26.035 MHz AM
26.065 MHz AM
26.115 MHz AM
26.145 MHz AM - with sporadic QRM from strong FSK bursts on this frequency 26145 kHz
26.165 MHz AM
26.175 MHz AM - QRM from FSK signals on this frequency too 26175 kHz
26.185 MHz AM
26.255 MHz AM
26.335 MHz AM
26.405 MHz AM
26.505 MHz AM
26.515 MHz AM
26.655 MHz AM
26.685 MHz AM
26.695 MHz AM - noting some stronger QRM from UK based paging systems on here POCSAG
26.755 MHz AM
26.765 MHz AM
26.795 MHz AM
26.935 MHz AM
26.945 MHz AM - QRM from US freeband stations

27.485 MHz AM - severe SSB QRM
27.515 MHz AM - severe SSB QRM
27.525 MHz AM - severe SSB QRM
27.735 MHz AM
27.755 MHz AM
27.765 MHz AM
27.775 MHz AM
27.785 MHz AM - QRM with UK FM CB
27.805 MHz AM
27.815 MHz AM
27.835 MHz AM
27.855 MHz AM severe QRM
27.875 MHz AM

68

UK paging systems coming in (barely) on 26.695 MHz, 26.745 MHz, 26.750 MHz and 26.755 MHz.  26745 is the best signal at 1930 UTC.

Nothing noted on the lower 26 MHz paging frequencies, including 26.200 MHz, 26.220 MHz, 26.250 MHz, 26.300 MHz, 26.350 MHz, 26.400 MHz, 26.450 MHz, 26.500 MHz, 26.550 MHz (26.555 MHz LSB is going nuts), 26.600 MHz...26.650 MHz has some very weak POCSAG

UK FM CB:

27601 FM - UK FM CB Channel 1 - freq 27.60125 MHz FM - very dramatic fading
27611 FM - UK FM CB Channel 2 - freq 27.61125 MHz FM - noted UK accents, severe SSB QRM
27631 FM - UK FM CB Channel 4 - freq 27.63125 MHz FM - weak, severe QRM from 27.630 MHz and 27.635 MHz
27731 FM - UK FM CB Channel 14 - freq 27.73125 MHz FM - weak, but there, QRM from taxi cab on 27.735 MHz AM and SSB freebanders
27781 FM - UK FM CB Channel 19 - freq 27.78125 MHz FM - oh yeah, the busy one.  Taxi cab dispatcher YL QRM from 27.775 MHz AM and 27.785 MHz AM
27841 FM - UK FM CB Channel 25 - freq 27.84125 MHz FM - noted activity on this frequency quite often, taxi cab QRM from 27.845 MHz AM
27851 FM - UK FM CB Channel 26 - freq 27.85125 MHz FM - severe QRM from 27.855 MHz LSB
27891 FM - UK FM CB Channel 30 - freq 27.89125 MHz FM - some activity, as expected lots of Spanish language QRM
27911 FM - UK FM CB Channel 32 - freq 27.91125 MHz FM - some activity, U.S. truckers on 27.905 MHz causing issues
27951 FM - UK FM CB Channel 36 - freq 27.95125 MHz FM - FM carrier on frequency, American freeband CB on 27.955 MHz AM
27961 FM - UK FM CB Channel 37 - freq 27.96125 MHz FM - very heavy accents
27991 FM - UK FM CB Channel 40 - freq 27.99125 MHz FM - some very sporadic activity noted

69
SIO 333 signals, received locally (Richmond, VA).  Talking about different trucking companies and general informal chatter.  Nice sounding AM signals, no overmodulation, splatter or insane amounts of echo. 

26735 kHz AM 26.735MHz AM.  U.S. truckers on export radios out of band CB radio free band CB 11 meter truck radios. 

26.735 MHz AM is CB radio channel 19 "down one band"....which is one of the reasons why 26.735 MHz AM is so popular for long-haul truckers.  Same with channel 19 "up one band" - 27.635 MHz AM.

26735kHz free band CB radio frequency "low channels" or "Band C". 


70
26.7650 MHz AM taxi cab dispatch coming in all day today.  Signal strength seems to be steadily improving.  YL dispatcher.  March 15th, 2024.

At 1850 UTC, I am able to hear the taxi cab drivers replying to the dispatcher on frequency. 

71
Via G8JNJ SDR. 

Two distinct data signals - center frequency is 27760 kHz 27.76 MHz, lower side data signal is centered at approx. 27.757 MHz or 27.758 MHz and the high side data signal is centered at approx. 27.762 MHz or 27.763 MHz. 

Overall bandwidth is almost exactly 10 kHz...looks like its closer to 9.5 kHz. 

Video link:

https://www.youtube.com/watch?v=PR7WsFErip8


72
10/11 meters / Fishing Fleet Comms 27.5 MHz - 30 MHz
« on: March 15, 2024, 1416 UTC »
Listening to the G8JNJ SDR this morning...lots of Asian fishermen chatting away

27.500 MHz FM - I believe this is the first time I've heard them on Channel 001, 27.5 MHz FM.
27.525 MHz FM
27.625 MHz FM
27.675 MHz FM
27.700 MHz FM
27.725 MHz FM
27.750 MHz FM
27.825 MHz FM
27.850 MHz FM
27.925 MHz FM
27.950 MHz FM
27.975 MHz FM
28.325 MHz FM
28.375 MHz FM
28.525 MHz FM
28.5375 MHz NFM
28.625 MHz FM
28.700 MHz FM
28.725 MHz FM
28.825 MHz FM
28.875 MHz FM
28.925 MHz FM
28.975 MHz FM
29.000 MHz FM
29.025 MHz FM
29.150 MHz FM
29.200 MHz FM
29.225 MHz FM
29.325 MHz FM
29.425 MHz FM
29.700 MHz FM
29.7375 MHz NFM
29.750 MHz FM
29.775 MHz FM
29.825 MHz FM
29.875 MHz FM
29.9375 MHz NFM
29.9625 MHz NFM
29.975 MHz FM
29.9875 MHz NFM
30.0125 MHz NFM
30.025 MHz FM

and so on

lots of 12.5 kHz narrowband channels active today above 30 MHz, honorable mentions include 30.1875 MHz, 30.3375 MHz, 30.6375 MHz, 30.7875 MHz, 31.6375 MHz, 31.7375 MHz, 31.7625 MHz, 31.7875 MHz, 32.0375 MHz, 32.0875 MHz, 32.1375 MHz, 32.1875 MHz, 32.2125 MHz, 32.9125 MHz, 32.9375 MHz

73
Follow up, I believe I have compiled all my recordings of the voice pager (with tone out alert tones) + narrowband POCSAG + wideband POCSAG paging system on 27.885 MHz 27885 kHz:


4 March 2024 Part 1:
https://youtu.be/iGzVTJirykU

4 March 2024 Part 2:
https://youtu.be/HorFzI9Sq0M


1 March 2024 Part 1:
https://youtu.be/9rR6jm9OFKg

1 March 2024 Part 2:
https://youtu.be/h42jHDBnSvA


27 February 2024 Part 1:
https://youtu.be/FlRQfJUgLBI

27 February 2024 Part 2:
https://youtu.be/VUbcwUtgOiA


23 February 2024 Part 1:
https://youtu.be/bFesHLxAHvc

23 February 2024 Part 2:
https://youtu.be/G-ei74kkN8U


20 February 2024 Part 1:
https://youtu.be/Nlutv4SUNJg

20 February 2024 Part 2:
https://youtu.be/CDDPZt2y1bQ


17 January 2024
https://youtu.be/R5GWeLvKtMM


15 December 2023
https://youtu.be/C6R50M8Q-dY


1 December 2023
https://youtu.be/FmAUHAm6rkk


24 October 2023
https://youtu.be/g-8CHON_QxU


74
10/11 meters / Re: 27.7000 SSTV and others 1750Z
« on: March 13, 2024, 1816 UTC »
I was not aware that the rules were changed to allow Slow Scan Television on 11 meters...  Not that it is the Citizens Band because the Citizens Band does not go that high up in frequency...

It's the "freeband".  The CB rules for the USA do not permit SSTV.  However, the CB radio service in countries like Germany, Czech Republic and others actually do allow data modes, digimodes, fax/SSTV - either on all of the available channels, or on specific channels.  Germany and the Czech Republic have 80 legal CB channels available.  Channels 1-40 are identical to the European standard channels - which are identical to the US FCC 40 channels / American CB channels.  Just like in the USA - AM, FM and SSB voice modes are permitted on channels 1-40.  Digital modes are permitted on certain channels (see below).

Channels 41-80 are actually lower in frequency, and only FM (narrow FM) and digital modes are allowed.  Digital modes include FT8, ROS, PSK31, SSTV and regular old AX.25 packet

Channel 41 is 26.565 MHz
Channel 42 is 26.575 MHz
Channel 43 is 26.585 MHz
Channel 44 is 26.595 MHz
Channel 45 is 26.605 MHz
..10 kHz spacing up to
Channel 76 is 26.915 MHz
Channel 77 is 26.925 MHz
Channel 78 is 26.935 MHz
Channel 79 is 26.945 MHz
Channel 80 is 26.955 MHz

German regulations specify:

27.025 MHz - Channel 6 - data channel - digital modes permitted
27.035 MHz - Channel 7 - data channel - digital modes permitted
27.085 MHz - Channel 11 - Internet gateways (remote stations) allowed
27.255 MHz - Channel 23 - data channel - digital modes permitted - FT8 very popular on 27.255 MHz USB
27.235 MHz - Channel 24 - data channel - digital modes permitted - ROS very popular
27.245 MHz - Channel 25 - data channel - digital modes permitted - ROS very popular
27.295 MHz - Channel 29 - Internet gateways (remote stations) allowed
27.395 MHz - Channel 39 - Internet gateways (remote stations) allowed
27.405 MHz - Channel 40 - data channel - digital modes permitted
26.675 MHz - Channel 52 - data channel - digital modes permitted
26.685 MHz - Channel 53 - data channel - digital modes permitted
26.755 MHz - Channel 60 - Internet gateways (remote stations) allowed
26.765 MHz - Channel 61 - Internet gateways (remote stations) allowed
26.865 MHz - Channel 71 - Internet gateways (remote stations) allowed
26.915 MHz - Channel 76 - data channel - digital modes permitted
26.925 MHz - Channel 77 - data channel - digital modes permitted
26.955 MHz - Channel 80 - Internet gateways (remote stations) allowed

Voice communications (AM, FM, SSB on channels 1-40, FM only on channels 41-80) is allowed on all 80 channels.  Internet gateways frequently use CTCSS (PL) tone squelch to avoid keying the remote receiver up constantly.  67.0 Hz, 77.0 Hz, 88.5 Hz and 100.0 Hz are all popular. 

In regards to out of band use (freebanding) - 27.700 MHz USB is the unofficial SSTV frequency. 

The 25.6 MHz to 26.96 MHz ("low channels") and the 27.41 MHz to 28.0 MHz ("high channels") are extremely popular with out of band CB radio users, business users, truckers, all sorts of folks.

The most popular ones are within the "low band" (directly below channel 1) and "high band" (above channel 40).

Specifically:

26.515 MHz - 26.955 MHz
and
27.415 MHz - 27.855 MHz

Note that the German 80 channel CB allocation overlaps most of 26.515 - 26.955. 

Numerous other countries have additional channels.  Good examples include:

Brazil - 80 channels, 26.965 MHz to 27.855 MHz

Russia - 240 channels (two sets of 120 channels)

Alphanumeric channel identification.  Band (letter), two digit channel number, plus the "grid" or "raster" (E for the standard band plan, frequencies end in 5, P or R for the Polish band plan, channels -5 kHz, channel frequencies end in 0).  So even though the 10 kHz spacing is in place for each of the two "rasters", the Russian CB allocation is effectively 5 kHz spacing. 

26.060 MHz to 26.500 MHz - Band A - Raster R / P (zeros)
26.065 MHz to 26.505 MHz - Band A - Raster E (fives)
26.510 MHz to 26.950 MHz - Band B - Raster R / P (zeros)
26.515 MHz to 26.955 MHz - Band B - Raster E (fives)
26.960 MHz to 27.400 MHz - Band C - Raster R / P (zeros)
26.965 MHz to 27.405 MHz - Band C - Raster E (fives)
27.410 MHz to 27.850 MHz - Band D - Raster R / P (zeros)
27.415 MHz to 27.855 MHz - Band D - Raster E (fives)

So
frequency 27.135 MHz AM would be formatted as Channel C15E AM
frequency 27.700 MHz FM would be formatted as Channel D23P FM / D23R FM
frequency 26.560 MHz FM would be formatted as Channel B05P FM / B05R FM
frequency 27.635 MHz FM would be formatted as Channel D19E FM
frequency 27.555 MHz USB would be formatted as Channel D12E USB

and so on

AM, FM, USB and LSB are all allowed.  Use of the skipped "A" channels is also widespread...that includes the skipped "A" channels -5 kHz. 

Of course, there are other examples:

UK CB radio channels - 40 + 40

the standard European 40 channel allocation (identical to the American CB band plan) is permitted in the UK.  AM, FM and SSB are all permitted on the standard 26.965 MHz - 27.405 MHz EU/CE/CEPT/US FCC band.  The UK also has an additional 40 channels UK-specific UK FM "27/81 CB" (narrow FM voice only)

27.60125 MHz to 27.99125 MHz (straight 10 kHz sequence, no skipped channels, channels are not out of order for channels 23, 24 and 25). 

The UK specifically adopted the weirdo 1.25 kHz offset (or 3.75 kHz offset, depending on how you look at it) as an attempt to cut down both interference from distant skip signals and to reduce RFI / TVI concerns.  The original UK FM rigs all had a -10dB switch to reduce RF output power from 4 watts (maximum power) to 0.4 watt / 400mW. 

The UK FM CB band overlaps with about half the "high channels" (27.415 MHz - 27.855 MHz). 

In addition to the UK FM allocation, Ireland has a service specifically for parish radio broadcasting that uses the same spectrum.  It actually has 3 channel sets for a total of 120 available channels.  FM and AM are both allowed:

CB01 - CB40 channels are, as you'd expect, CB radio channels 1 to 40 - 26.965 MHz - 27.405 MHz (AM or FM allowed)

LW01 - LW40 channels are identical to the UK FM CB band plan, with the last two digits cut off.  So instead of 27.78125 MHz, its just 27.781 MHz. 

LW01 - 27.601 MHz
LW02 - 27.611 MHz
LW03 - 27.621 MHz
LW04 - 27.631 MHz
LW05 - 27.641 MHz
LW06 - 27.651 MHz

10 kHz spacing, and so on up to

LW35 - 27.941 MHz
LW36 - 27.951 MHz
LW37 - 27.961 MHz
LW38 - 27.971 MHz
LW39 - 27.981 MHz
LW40 - 27.991 MHz

and finally the UW01 - UW40 channels:

UW01 - 27.605 MHz
UW02 - 27.615 MHz
UW03 - 27.625 MHz
UW04 - 27.635 MHz
UW05 - 27.645 MHz
UW06 - 27.655 MHz

10 kHz spacing up to

UW35 - 27.945 MHz
UW36 - 27.955 MHz
UW37 - 27.965 MHz
UW38 - 27.975 MHz
UW39 - 27.985 MHz
UW40 - 27.995 MHz

FM and AM modes are allowed on CB01 - CB40, LW01 - LW40 and UW01 - UW40.  The LW and UW frequencies are so close to each other that interference is pretty much a given if two transmitters are close enough to each other.  The vast majority of Irish 27 MHz parish radio/church radio systems use FM mode.  Just like with the UK FM allocation, there are no skipped channels, and channels 23, 24 and 25 are not out of order. 


75
10/11 meters / Re: WWV's 25MHz signal?
« on: March 13, 2024, 1746 UTC »
Daily, or almost. 

Same with the FM carrier on 25.950 MHz.

Location: central Virginia - Richmond, VA.

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