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Messages - R4002

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No  PL tone / CTCSS tone

Makes sense, carrier squelch it is! 

26.190 MHz FM [CSQ] PL=none KSL remote STL 26.19MHz 26190 FM 26,190 kHz FM

Faded in at around 1745, maybe a few minutes later.  Stronger signal locally and on U.S. East Coast SDRs, including the W3HFU and N1NTE SDRs.  Very dramatic fading at points.  Signal actually dropped out completely for 10-15 seconds around 1753 UTC. 

Frequency: 26110 kHz 26,110 kHz 26.11 MHz 26.110 MHz 26.1100 MHz FM STL cue transmitter Part 74

Also checked the carrier transmitter on 25.950 MHz, it is much weaker than usual, also very dramatic fading.

KOVR's STL signal went off the air (very clearly so - several seconds of unmodulated FM carrier, then the transmitter was switched off) at 1755 UTC. 

At 1757 UTC, the carrier came back on...then off again at 1757 for 4-5 seconds, then back on with audio again (still at 1757 UTC).  On the air with studio audio at 1758 UTC.

Via UK based receivers, first heard at 1130 UTC on 29850 kHz 29,850 kHz 29.85 MHz 29.850 MHz FM.  Sounds like Japanese, strong FM modulation but the signal strength(s) are all over the place.  Lots of fading.

At around 1230 UTC, I was tuning around 27 MHz band, came across more Asian fishermen chatter on

27.525 MHz FM
27.750 MHz FM
27.800 MHz FM

At 1252 UTC, the signals on 29.850 MHz FM have become considerably stronger, and the frequency is busier in general.  Noting weak activity on

27.650 MHz FM - with severe QRM from UK FM CB signals on 27.651 MHz FM - 27.65125 MHz FM UK FM CB Channel 6
27.700 MHz FM - sporadic SSTV QRM signals on 27.700 MHz USB, along with UK FM
27.825 MHz FM
27.850 MHz FM - also suffering from SSB QRM, paging POCSAG QRM from 27.845 MHz and UK FM CB on 27.851 MHz FM
29.775 MHz FM
29.825 MHz FM
29.875 MHz FM
29.950 MHz FM

No activity on the 12.5 kHz offset frequencies like 29.9625 MHz, 29.9875 MHz, 30.0125 MHz, etc...at least not yet.  The pagers on 29.8 MHz and 29.9 MHz aren't coming in at the moment either.

Both 29.825MHz FM and 29.875MHz FM seem to be some of the more popular frequencies.  29.750 MHz FM also active at 1255 UTC with Asian fishery chatter.

I believe this is the first time I've come across a log for this station on this frequency - 26190 kHz FM / 26.190 MHz FM 26.19 MHz STL/IFB. 

Any chance you decoded a PL tone / CTCSS tone?

Nice log either way.

U.S. truck drivers talking about road conditions, other typical trucker stuff.  Just after 2000 UTC on 04/29/2024.

27875 kHz AM
27.875 MHz AM
27.875 AM

Somewhat popular frequency for this purpose.  27.855 MHz, 27.865 MHz, 27.905 MHz, 27.915 MHz and others have been logged in the recent past, along with the more 'usual suspects' of 27.635 MHz AM, 27.535 MHz AM, 27.575 MHz AM, 27.585 MHz AM, 27.805 MHz AM and many, many more below CB channel 1...including 26.735 MHz AM, 26.915 MHz AM...and so on....down to 25.615 MHz AM.

2000 UTC
29 April 2024

Received locally, also hearing them on the N1NTE SDR.  Weak to fair reception, land mobile radio comms, taxi cab dispatcher.  YL taxi dispatcher and OM drivers, frequency 27815 kHz, AM mode.  27.815MHz AM 27,815 AM, taxi dispatch.  Spanish speaking comms, probably out of Mexico. 

Latin American stations coming in this afternoon, notably using FM mode!  Lots of activity on 27435 and 27475. 

27,435 kHz FM 27.435MHz FM
27,475 kHz FM 27.475MHz FM

Heard locally and on several U.S. East Coast SDR receivers.  Glad to see more FM adoption!

Tuned in at 1805 UTC.  Solid FM signal noted on 29.71 MHz FM.   Sounds like Spanish language, but this is a legal Part 90 Business / Industrial Radio Pool - Business Radio Service - frequency.  20K0F3E emission.  Given signal strengths, probably mobile to mobile comms.  Could be any number of licensed users.  Unable to pull CTCSS tone (PL tone).  29.710 MHz FM

The FCC actually calls everything above 25 MHz part of the land mobile service for Part 90 allocation.  However, the 25 MHz frequencies are only licensed to a handful of users.  The 27 MHz frequencies are used, but same thing applies...only a handful of users.  There are more licensed users on 29 MHz and even more on the regular 30-50 MHz frequencies.  The 27 MHz frequencies may all be licensed for itinerant use, 27.49 MHz is itinerant only, same with 35.04 MHz and 43.04 MHz.   

The 27 MHz frequencies suffer from severe QRM during band openings.  Regular FM voice is most commonly used, but some licensed users have emissions for more traditional HF modes such as AM voice, SSB voice, RTTY and other narrow-band digital modes.

25.020 MHz
25.040 MHz
25.060 MHz
25.080 MHz
25.100 MHz
25.120 MHz
25.140 MHz
25.160 MHz
25.180 MHz
25.200 MHz
25.220 MHz
25.240 MHz
25.260 MHz
25.280 MHz
25.300 MHz
25.320 MHz

27.430 MHz
27.450 MHz
27.470 MHz
27.490 MHz - itinerant only
27.510 MHz - low power only
27.530 MHz - low power only

29.710 MHz
29.730 MHz
29.750 MHz
29.770 MHz
29.790 MHz

30.580 MHz
30.600 MHz
30.620 MHz
30.640 MHz
30.660 MHz
20 kHz spacing up to 31.980 MHz

33.020 MHz to 33.980 MHz - 20 kHz steps
35.020 MHz to 35.980 MHz - 20 kHz steps
37.020 MHz to 37.980 MHz - 20 kHz steps
39.020 MHz to 39.980 MHz - 20 kHz steps
42.020 MHz to 46.580 MHz - 20 kHz steps
47.020 MHz to 49.580 MHz - 20 kHz steps

Plus special frequencies:

36.250 MHz FM - may be used for oil spill clean up operations only (simplex or repeater)
41.710 MHz FM - may be used for oil spill clean up operations only (simplex or repeater)

Usually 36.25 MHz is used as the repeater output.  Both 36.25 MHz and 41.71 MHz are shared with federal government users and U.S. military users, which are the primary users on the

30.000 MHz to 30.550 MHz
32.000 MHz to 33.000 MHz
34.000 MHz to 35.000 MHz
36.000 MHz to 37.000 MHz
38.000 MHz to 39.000 MHz
40.000 MHz to 42.000 MHz
46.600 MHz to 47.000 MHz
49.600 MHz to 50.000 MHz

bands.  25 kHz spacing is the standard for military operations.  Federal government systems use a mixture of 20 kHz spacing and 25 kHz spacing.  A good example of this is the SNOTEL telemetry system that operates on 40.67 MHz 40.670 MHz.

Military users are allocated secondary rights on all frequencies outside the bands listed above for the entire 30-88 MHz spectrum, including the 50-54 MHz 6 meter amateur radio allocation, the 72-76 MHz fixed, mobile, RCRS, Part 90, assistive listening service and 74.8 MHz - 75.2 MHz subband for the 75.000 MHz marker beacons on 75 MHz aeronautical service...and of course the 54-72 MHz and 76-88 MHz broadcasting bands.   

27.725 MHz FM via the W3HFU KiwiSDR at 1800 UTC tune in.  Some pretty serious fades....but it sounds like the typical fishery radio chatter.  Asian fishing fleets Chinese fishing radio dedicated fishery radiotelephone

27.5 MHz - 39.475 MHz 25 kHz spacing - normal mode for 480 channels, FM voice, 25w output - 16K0F3E
27.5 MHz - 39.4875 MHz 12.5 kHz spacing - export mode 960 channels NFM voice, 25w output - 11K0F3E

27,755kHz AM 27.755 MHz AM, SIO 222 with some very dramatic fading.  Spanish language, Mexican accented YL reading alphanumeric taxi cab IDs, addresses, phone numbers...taxi cab dispatcher on 27 MHz band.  27.755 MHz, AM mode.   

First noted at 1750 UTC

Starting hearing the dispatch lady - I believe out of Central Mexico or Northern Mexico on 26765 kHz 26.765 MHz 26.7650 MHz AM around 1630 UTC today.

At 1700 UTC or so, signal levels still roughly the same.  Coming in nicely on some U.S. East Coast online SDR receivers at 1730 UTC and now - 1740 UTC. 

Tell-tale end of transmission tone burst (EOT) - aka the "Roger beep" basically an automatic identification system. 

Frequency 26.7650 MHz AM is CB Channel 21 down one band.  Band C, Channel 21 on the regular 25.615 MHz - 28.305 MHz 240 channel export radio band plan....or Channel B21E / B21E AM on the alphanumeric channel plan.

Some QRM from FM mode traffic around 1741 UTC / 1742 UTC...26.765 MHz FM coming in at the same time as 26.765 MHz AM. 

Also noting some European based paging signals on 26.695 MHz, 26.745 MHz...so there's still somewhat of an opening to Europe / the UK, which is likely where the FM CB signals on 26765 are coming from. 

April 15, 2024.

Location:  local receive in Richmond, VA
Plus several other U.S. East Coast online SDR receivers, including N1NTE and W3HFU

Time: 1730 UTC

27.195MHz RCRS frequency 27,195 27195kHz 27.1950 MHz AM mode.  Spanish language YL dispatcher with various data signals down closer to the noise floor. 

Listening via the G8JNJ SDR at 1750 UTC tune-in time.  Numerous transmitters active on 31.325 MHz, various signal strengths.  Tell-tale polytone data signal

In addition to 31325 kHz / 31.3250 MHz, EPAR data bursts are coming in on:

31.4375 MHz
31.6375 MHz
31.6875 MHz
31.9250 MHz
31.9750 MHz

However 31.325 FM is the most active frequency, at least at the moment.  It's been a while since I've heard the EPAR system.  Sort of a de facto beacon.

Via the G8JNJ SDR receiver located in the SW UK.  28975 kHz FM NFM 28,975 28.975.0 MHz.

I managed to get a video clip of the activity on 28.975 MHz


Noted these guys on numerous additional frequencies, including:

27.500 MHz FM
27.525 MHz FM
27.575 MHz FM
27.600 MHz FM with heavy QRM from SSB CB signals and UK FM CB ch. 1 - freq 27.60125 MHz FM
27.750 MHz FM
27.775 MHz FM
27.875 MHz FM with QRM from Russian taxi cab dispatcher YL land mobile comms on 27875 FM
27.925 MHz FM
27.975 MHz FM
28.025 MHz FM
28.175 MHz FM
28.225 MHz FM
28.350 MHz FM
28.375 MHz FM
28.725 MHz FM
28.775 MHz FM
28.825 MHz FM
28.875 MHz FM
29.000 MHz FM
29.150 MHz FM
29.625 MHz FM - QRM from legit ham signals
29.700 MHz FM
29.750 MHz FM
29.775 MHz FM
29.825 MHz FM
29.875 MHz FM
29.925 MHz FM
29.950 MHz FM
30.075 MHz FM
30.125 MHz FM
30.150 MHz FM
30.175 MHz FM

and many more above 30 MHz

10/11 meters / Fisheries Comms 27.5875 MHz NFM Asian Fishermen
« on: March 29, 2024, 1325 UTC »
This is a new one for me.  They're using 12.5 kHz offsets...but I've never logged the 12.5 kHz offset channels below 29 MHz. 

27.5875 MHz NFM 27587.5 kHz NFM [CSQ] sounds like Japanese language. SIO 444 at 1320 UTC on the G8JNJ SDR

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