We seek to understand and document all radio transmissions, legal and otherwise, as part of the radio listening hobby. We do not encourage any radio operations contrary to regulations. Always consult with the appropriate authorities if you have questions concerning what is permissible in your locale.

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81
Received via the W3HFU SDR receiver on 22 October 2026. 

U.S. stations, one male and one female heard, sounds almost like a dispatcher talking to mobiles in the field. 

26515 kHz 26.515MHz AM - Channel 1 "down one band". 
82
North American Shortwave Pirate / Re: WTPK 6930 USB 1513 UTC 22 OCT 2026
« Last post by Markokpik on October 22, 2026, 1619 UTC »
1541  'Feels So Good' - Chuck Magione, 'No Problem (feat. Budd Johnson, Ed Shaughnessy, Jimmy Knepper, Joe Benjamin, Julius Watkins, Sheldon Powell) - Clark Terry, 'I'm Gonna Move to the Outskirts of Town (feat. Eric Clapton) - David Sanborn, 'Lonely Avenue' - Diana Krall, DJ giving next songs, ID over piano solo, 'Out to Lunch' - Eric Dolphy, 'Mambo Carmel' - Erroll Garner, DJ mentioning music & 77LJS, HFU shout out to me, & ID, 'K-4 Pacific' - Gerry Mulligan, ending with this track, shout outs to HFU (incl. me) & continues w/ track, 'Hat and Beard' - Eric Dolphy (on bass clarinet this time - thanks!).

S9+10.  Great signal - armchair.

Thanks for the jazz, especially Eric Dolphy!
83
European MW Pirate Radio / UNID (NL) 1647 AM 1616 UTC 22 OCT 2026
« Last post by The Mercian on October 22, 2026, 1617 UTC »
SIO 232

1616 Unknown NL song

1926 The promise you made / Cock Robin
84
10/11 meters / 27.785 MHz AM Taxi Cab Dispatch - Mexico 1615 UTC 22 Oct 2026
« Last post by R4002 on October 22, 2026, 1617 UTC »
Received via W3HFU SDR receiver.  YL dispatcher speaking Spanish starting to fade up out of the noise.  No sign of anything on UK FM CB channel 19, which is right next door in frequency on 27.781 MHz - 27.78125 MHz FM. 

If the band conditions continue as they tend to do, this taxi cab radio dispatcher on 27785 kHz AM will get stronger over the next few hours, and other taxi cab radio signals will start popping up all over the 25.615 MHz to 27.995 MHz band, both inside and outside the legal CB band.
85
European MW Pirate Radio / UNID (NL) 1665 AM 1615 UTC 22 OCT 2026
« Last post by The Mercian on October 22, 2026, 1616 UTC »
SIO 232

1615 State of independence / Donna Summer
86
European MW Pirate Radio / Radio Blackbeard 1494 AM 1612 UTC 22 OCT 2026
« Last post by The Mercian on October 22, 2026, 1614 UTC »
SIO 343

1612 Don't give me your life / Alex Party
1614 Better off alone / Alice Deejay
87
Received via the W3HFU SDR with the 120 foot T2FD antenna. 

Frequency 27195kHz 27.195MHz 27,195

MFSK signal that appears to be slightly off-frequency (center frequency on roughly 27194.6 kHz or 27194.7 kHz), this signal is often heard when propagation conditions to points south are good - usually when the Spanish language taxi cab dispatchers start to come in.

In addition to the nearly non stop MFSK signal, there is another similar sounding (but not identical) signal that is centered right on 27195.0 kHz.  There's also what appears to be an OOK on off keying type signal on 27195.1 kHz.  Lots of activity on this frequency right now.

RCRS regulations allow up to 4 watts power and bandwidth is limited to 8 kHz.  Any non-voice mode may be used.  Of course, there are plenty of folks using voice (usually AM mode, but FM and SSB have been noted) in the 27190 kHz to 27200 kHz ballpark.

For, well, reasons, I guess, 27.195 MHz seems to be the second most popular of the six 26-28 MHz RCRS frequencies available under Part 95 Chapter C of the FCC rules.  27.255 MHz, even though it is shared with CB Radio Channel 23, is by far the most popular, since the rules permit up to 25 watts power instead of 4 watts.  Antenna height is limited to the 6.1m / 18.3m rule, otherwise known as the antenna may not be mounted more than 20 feet above the highest point of the structure on which it is mounted, and may not be mounted more than 60 feet above the ground, whichever is less. 

Either way, an antenna 60 feet up with 25 watts would produce very good range just by the nature of the 27 MHz band.  A halfway decent base antenna (there is no limit on the antenna itself, no gain limit, no antenna size limit under the FCC rules) would really give you some range, as the non-stop mixture of data signals of all sorts on 27255kHz on a basically daily basis shows us. 
88
Follow-up on BEN's ask in #2 for a longer run. I went and got one. It does not do the job, and the reason is worth more than the result.

I pulled the most recent Buzzer capture on the Shortwave Radio Audio Archive: 8 Aug 2025, start 19:17 UTC, Utwente WebSDR, recorded from Zlin, 14 min 50 s, 29.5 kbps mono mp3. That is roughly ten times the window in #1.

No usable cadence in it.

The marker is present. Taking 1 s windows across the whole file, the strongest bin in 300-2500 Hz sits a median 18.7 dB above the band median, and clears +6 dB in 100% of the 889 windows. So this is not an empty channel; the tone is there throughout.

But the envelope of that tone has no stable period. Over 120 s windows, the peak autocorrelation in the 1.2-5 s range lands at 1.15, 2.60, 3.90, 3.25 and 3.40 s in different windows, with r between 0.04 and 0.33. The level swells and nulls on a 5-15 s timescale, which is what 4625 sounds like at dusk over ~1000 km, and no threshold survives that.

Two consequences for the thread:

1. A longer capture is necessary but not sufficient. If the run is flutter-limited like this one, any threshold you pick latches onto the swells and you read a period that is an artifact of the fading. Missed edges on a fading signal can only push the apparent period up.

2. I hit exactly that on my first pass at this file. Same audio, generous threshold with a 60 s AGC: median period 3.16 s. Different smoother, Schmit-triggered: 2.17 s. That is 45% apart on identical samples. Neither number is a measurement of the station, so I am not publishing either.

Which means my earlier figures should carry the same caveat. The 2.88 s (2010) and 2.91 s (2022) I gave BEN are stable because those clips are short and relatively clean, not because short clips are inherently safe. Any period quoted from a fading capture needs its r and its window alongside it, or it is just a number that fits a threshold.

What would settle it: 10+ minutes in which the marker is above the noise for most of the run with no antenna flutter, ideally 0000-0400 UTC, and a raw wav or flac rather than a 30 kbps mp3. Post one and I will run the same code on it and put up the numbers with the method and the code.

File attribution: SRAA item for 8 Aug 2025, contributor Martin Knotek, receiver Utwente WebSDR, Zlin. I did not record it and I am not vouching for the receiver chain.
89
10/11 meters / 11 Meter Logs 21 Oct 2026 - 2000 - 2130 UTC [G8JNJ UK SDR]
« Last post by R4002 on October 22, 2026, 1558 UTC »
27.985 MHz AM - U.S. trucking company or similar business land mobile type comms rec'd around 2120 UTC
27.865 MHz AM - Taxi cab dispatch - YL Dispatcher - Spanish
27.835 MHz AM - Taxi cab dispatch - YL Dispatcher - Spanish
27.785 MHz AM - Taxi cab dispatch - YL Dispatcher - Spanish
27.775 MHz AM - U.S. truckers mixing with Mexican taxi cabs - rec'd around 2050 UTC
27.655 MHz AM - American truck drivers, could be logging company
27.585 MHz AM - American truckers, U.S. trucking company comms
27.425 MHz AM - Taxi cab dispatch - YL dispatcher - Spanish language
27.415 MHz AM - Taxi cab dispatch - YL dispatcher - Spanish language

27.390 MHz LSB - U.S. CBers operating sideband "in between channels" in between 27.385 MHz and 27.395 MHz
27.370 MHz LSB - U.S. CBers operating SSB "in between channels" in between 27.365 MHz and 27.375 MHz
27.355 MHz FM - FM mode CB chatter, U.S. stations, with severe QRM from AM and SSB signals - CB Channel 35
27.355 MHz USB - U.S. CBers - CB Radio CH 35
27.355 MHz AM - UNID U.S. CBers, with lots of QRM from 27.350 MHz USB and 27.355 USB and FM
27.350 MHz USB - U.S. CBers operating SSB "in between channels"
27.255 MHz FM - Non stop data bursts - RCRS frequency, 25 watt power limit, 8 kHz bandwidth limit
27.255 MHz AM - Taxi cab dispatch - YL dispatcher - Spanish language - CB Channel 23
27.255 MHz AM - American truckers / CBers - CB Radio Channel 23
27.195 MHz AM - American truckers, also guys doing radio tests - RCRS frequency, "Channel 19A"
27.195 MHz AM - Mexican taxi cab dispatcher - mixing with the RCRS data and American truck drivers.
27.195 MHz FM - MFSK data stream, various signals on top of each other
27.000 MHz USB - Portuguese language heard, strong signals! (in between 26.995 MHz and 27.005 MHz)
26.995 MHz FM - MFSK data bursts, sounds like paging or pager type signals - RCRS frequency
26.945 MHz AM - Taxi cab dispatch - YL dispatcher - Spanish language
26.915 MHz AM - U.S. freeband CB AM calling frequency "915" - very busy
26.905 MHz AM - U.S. truckers and free band CBers
26.885 MHz AM - U.S. free band 11 meter CB radio chatter, various stations
26.835 MHz AM - U.S. freeband CB radio activity, some fading
26.805 MHz FM - U.S. freeband FM calling frequency, counterpart to 26.915MHz AM
26.765 MHz AM - 21 October 2026 - Mexican taxi cab dispatch, Mexico City
26.745 MHz AM - 21 - Spanish speaking chatter, Mexican truckers?
26.735 MHz AM - U.S. truck drivers, truckers - this is CB radio channel 19 "down one band"
26.705 MHz AM - Puerto Rico and Florida heard - busy frequency
26.685 MHz AM - Spanish language, very busy
26.635 MHz AM - Mexican truckers, CBers
26.625 MHz AM -
26.615 MHz AM
26.605 MHz AM
26.595 MHz AM - Mexican truckers, CBers - Baja California
25.595 MHz FM - Mexican CB activity (in FM mode!)
26.585 MHz AM - Very busy
26.565 MHz LSB - Spanish speaking freebanders
26.555 MHz LSB - Latin American calling frequency - see also: 27.455 MHz USB
26.540 MHz LSB - Spanish language activity, likely QSY'ed from 26555 LSB
26.535 MHz LSB - Spanish speaking freebanders, likely QSY'ed from 26.555MHz LSB
26.525 MHz AM - Mexican and Puerto Rican stations heard
26.515 MHz AM - Mexican truckers, CBers


26.395 MHz AM - Mexican truckers, CBers - lots of echo and sound effects
26.385 MHz AM - Taxi cab dispatch - YL dispatcher - Spanish language
26.375 MHz AM - Very busy - Puerto Rico heard, other stations, lots of music and jamming
26.365 MHz AM - "El Caribe!" heard, similar to the traffic on 26375 and 26585
26.345 MHz LSB - Portuguese language, weak to fair signals
26.205 MHz AM - Taxi cab dispatch - YL dispatcher - Spanish language
26.175 MHz AM - Mexican / Latin American freeband CB activity
26.165 MHz AM - Taxi cab dispatch - YL dispatcher - Spanish language
26.055 MHz AM - U.S. freeband CB radio chatter - hunters or farmers?
26.045 MHz AM - Taxi cab dispatch - YL dispatcher - Spanish language
26.005 MHz AM - Taxi cab dispatch - YL dispatcher - Spanish language
25.805 MHz AM - Taxi cab dispatch - YL dispatcher - Spanish language
25.695 MHz AM - Taxi cab dispatch - YL dispatcher - Spanish language - previously logged
25.665 MHz LSB - Spanish language chatter
25.625 MHz AM - Taxi cab dispatcher - YL dispatcher - Spanish language
25.615 MHz LSB - Portuguese language chatter
90
North American Shortwave Pirate / Re: WTPK 6930 USB 1513 UTC 22 OCT 2026
« Last post by Mick Boyle on October 22, 2026, 1553 UTC »
NWPA

1552 No Problem (feat. Budd Johnson, Ed Shaughnessy, Jimmy Knepper, Joe Benjamin, Julius Watkins, Seldon Powell, Tommy Flanagan & Yusef Lateef)
Clark Terry

1554 I'm Gonna Move to the Outskirts of Town (feat. Eric Clapton)
David Sanborn



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