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.

Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.


Messages - R4002

Pages: [1] 2 3 4 5 6 7 8 9 ... 198
1
26.7650 MHz AM coming in nicely this afternoon (US East Coast time) 2010 UTC - 2015 UTC

Some additional land mobile comms coming in on:

25.685 MHz AM - Spanish language taxi dispatch lady
25.695 MHz AM - Taxi cab dispatcher, YL dispatch lady Mexico, active frequency / user LMR land mobile
25.815 MHz AM - Spanish language YL dispatcher
26.025 MHz AM - Taxi cab dispatcher, YL dispatch Spanish language
26.035 MHz AM - Taxi cab dispatcher, YL dispatch Spanish language
26.055 MHz AM - Taxi cab dispatcher, YL dispatch Spanish language
26.135 MHz AM - Taxi cab dispatcher, YL dispatch Spanish language
26.315 MHz AM - Taxi cab dispatcher, YL dispatch Spanish language
26.335 MHz AM - Taxi cab dispatcher, YL dispatch lady Mexico, active frequency / user LMR land mobile
27.515 MHz AM - Taxi cab dispatcher, YL dispatch Spanish language
27.525 MHz AM - US truck drivers / truckers using export radios
27.535 MHz AM - US truck drivers / truckers using export radios
27.575 MHz AM - Taxi cab dispatch - YL dispatcher Spanish language
27.635 MHz AM - US truckers, busy frequency
27.725 MHz AM - Taxi cab dispatcher - YL with end of transmission beeps
27.755 MHz AM - Taxi cab radio dispatch 27755 AM 27.755 MHz AM strong signals
27.815 MHz AM - Taxi cab radio comms, land mobile LMR user - Spanish language
27.905 MHz AM - US freeband CB radio chatter, possibly base stations
27.915 MHz AM - US truck drivers or other business user, heavy fading 27.915MHz 27915kHz

2
Hello all,

This is an interesting one, now that I’ve managed to catch the voice transmissions as well as the paging data. 

The voice messages include a “tone out” (possibly a selective calling tone) burst prior to the voice message.  Frequency is 27.885 MHz. 

The recordings linked below were all made via an online SDR in the UK, specifically the G8JNJ SDRs:

27.885 MHz FM Alert Tones Voice Message + Paging Signals [Part 1] G8JNJ SDR - 27 Feb 2024
https://youtu.be/FlRQfJUgLBI

and

27.885 MHz FM Alert Tones Voice Message + Paging Signals [Part 2] G8JNJ SDR - 27 Feb 2024
https://youtu.be/VUbcwUtgOiA


Voice message for “Part 2” begins at the very beginning of the video. 

For “Part 1” there is an in-progress voice message when I start recording.  At 0:28 in, you can hear the “tone out” burst - one long tone followed by two short tones…followed immediately by a voice message.   


Numerous other videos of the paging signals - including the various bandwidth POCSAG signals on frequency have been captured and are on the regular “R4002” page. 


The links above are the best capture I’ve gotten of the voice messages though. Here are the other two videos of the voice message:

27.885 MHz FM Data Paging + FM Voice Transmission UNID Source [G8JNJ SDR] 23 Feb 2024 [Part 1]
https://youtu.be/bFesHLxAHvc

^ voice transmission in progress at the very beginning of the recording.  This one is the worst quality of the clips I managed to get.  There is a “Part 2” video from 02/23/2024 but it only shows data / paging signals and increasing QRM from freeband CB radio signals on 27.880 MHz USB, 27.885 MHz LSB and 27.885 MHz AM - U.S. out of band 11 meter CB signals starting to fade in.

Older video / audio recordings of the voice paging pager / POCSAG paging on 27885 FM:

27.885 MHz FM POCSAG Paging + FM Voice Pager 27MHz Band 11M Band [G8JNJ SDR in UK] - 15-Dec-2023
https://youtu.be/C6R50M8Q-dY

^ from December 15th, 2023.  Tone out / alert tone at 0:16 in, follows the same format - one long tone burst followed by two short tone bursts followed by a voice message transmission (FM mode) followed by a moment of unmodulated FM carrier…then it switches back to paging data bursts. 

27.885 MHz FM Voice Paging + Data Bursts Pager System POCSAG Paging - Via G8JNJ SDR - 24 Oct 2023
https://youtu.be/g-8CHON_QxU

^ from October 24, 2023.  The voice message is in progress when the recording starts. 


 
 


 




 

3
10/11 meters / UK FM CB Activity 1945 UTC 26 Feb 2024
« on: February 26, 2024, 2027 UTC »
The band is lighting up this afternoon.  Lots of activity on UK FM CB radio channel 19, plus numerous others:

27.601 FM 27.60125 MHz FM - UK FM CB Channel 1 - FM carriers and voice, lots of SSB QRM - possibly music carriers?
27.631 FM 27.63125 MHz FM - UK FM CB Channel 4 - unmodulated FM carrier (???), QRM from 27.635 MHz
27.681 FM 27.70125 MHz FM - UK FM CB Channel 9 - another carrier - tons of QRM
27.731 FM 27.73125 MHz FM - UK FM CB Channel 14
27.751 FM 27.75125 MHz FM - UK FM CB Channel 16
27.781 FM 27.78125 MHz FM - UK FM CB Channel 19
27.791 FM 27.79125 MHz FM - UK FM CB Channel 20
27.831 FM 27.83125 MHz FM - UK FM CB Channel 24 - busy, QRM from AM freeband CB signals on 27.835 MHz
27.841 FM 27.84125 MHz FM - UK FM CB Channel 25 with QRM from 27.845 MHz AM taxi cab dispatch
27.861 FM 27.86125 MHz FM - UK FM CB Channel 27
27.901 FM 27.90125 MHz FM - UK FM CB Channel 31
27.911 FM 27.91125 MHz FM - UK FM CB Channel 32
27.921 FM 27.92125 MHz FM - UK FM CB Channel 33 with QRM from 27.915 MHz AM and 27.925 MHz AM truck drivers
27.931 FM 27.93125 MHz FM - UK FM CB Channel 34
27.951 FM 27.95125 MHz FM - UK FM CB Channel 36
27.961 FM 27.96125 MHz FM - UK FM CB Channel 37
27.971 FM 27.97125 MHz FM - UK FM CB Channel 38 - calling frequency
27.981 FM 27.98125 MHz FM - UK FM CB Channel 39
27.991 FM 27.99125 MHz FM - UK FM CB Channel 40

27.841 FM (UK FM CB Channel 25) is actually as busy as 27.781 FM.  Unfortunately there's enough Latin American taxi cab comms starting to come in that the AM mode land mobile comms QRM is becoming a thing, especially on 27.78125MHz

Plenty of in-band activity and SSB all over the place.  26.805 MHz FM active as well.   

UK paging pager signals POCSAG on 26.745 MHz, 26.705 MHz, 26.695 MHz, 26.350 MHz, 26.250 MHz and 26.200 MHz. 

4
26.765 MHz AM is a good indicator of propagation to Mexico.  Plenty of others, including numerous in the 27.405 MHz - 27.995 MHz range, using AM mode. 

I’m hearing the taxi cab dispatcher YL right now at 1915 UTC via a local handheld receiver.  She’s also coming in on the W3HFU SDR. 


5
10/11 meters / Class C CB (RCRS) 27 MHz Telemetry Yahoo Group Archive
« on: February 26, 2024, 1816 UTC »
Info from the VHFDX email chain, good group of 25-30 MHz and VHF low band DXers (as well as other bands, including 22m interest).  Given the amount of data traffic on 27.255 MHz and the other RCRS frequencies, I wanted to share this with the HFU forums so this link is archived

https://web.archive.org/web/20201214034230/https://groups.yahoo.com/neo/groups/Class_C_Telemetry/info

6
They’ve been coming in basically daily.  Nice to hear actual SWBC on the 11 meter band

7
26.765 MHz AM active yesterday with some nice signals, YL dispatcher.

8
Received via the W3HFU SDR and locally (local receive setup consisting of a PNI Escort HP 82 handheld AM / FM CB walkie talkie with a HYS 51” telescoping whip. 

Recording transmitted at least twice.  Included English translation of German, plus crowd noise.  Waterfall waveform shows no delay in the two signals…but the 26.855 MHz FM signal had more FM deviation. 


26805 FM 26,805 kHz 26805 MHz
26855 FM 26,855 kHz 26855 MHz

Recording of the signals as received via SDR:

[Part 1]
https://youtu.be/-Uxs8OSMEf8

[Part 2]
https://youtu.be/_D0d_wHaJdA

The first SDR clip also shows a strong AM signal on 26.825 MHz, unrelated to the simulcast on 26.805 FM and 26.855 FM. 

And received locally on the handheld CB

[Part 1]
https://youtu.be/r9pW0ORO8OY

[Part 2]
https://youtu.be/3XCGizYum3c


The PNI HP82 is in DE mode 80 channel CB radio mode, so 26.805 MHz FM is channel 65 and 26.855 MHz FM is channel 70. 


The 26.855MHz signal sounds a bit distorted, likely due to the higher level of FM deviation on that signal. 

The band was open to Europe and the UK as well as the Americas - signals from the U.S. and Latin America were booming in all at once, with lots of FM mode CB radio signals mixing in with domestic AM and SSB, including French and German CB radio traffic on channels 38 and 39, often completely blocking LSB signals on 27.385 MHz and 27.395 MHz. 

FM CB radio activity coming in on the known DX calling channels frequencies 27.305 MHz and 27.315 MHz / CB Channel 30 FM and 31 FM.  American FM CB activity on 27.275 MHz FM (CB Channel 27 FM) and 27.295 MHz FM (CB Channel 29 FM) plus 30 and 31, with lots of severe QRM at points.  Channels 35-40 had AM, FM and SSB going all at once. 

Lots of German language signals on 26MHz band German FM CB channels and the UK FM channels were busy too.  27.78125 MHz FM was very busy, as to be expected.  Lots of Latin American language taxi dispatch chatter, including the 27.785 MHz AM Mexican taxi cab dispatch LMR comms, plus American free band CB signals, lots of SSB but also AM, including 27.845 MHz AM, 27.855 MHz AM, 27.865 MHz AM, 27.905 MHz AM, 27.915 MHz AM, 27.925 MHz - possible militia comms on 27.925MHz AM with QRM from 27.92125 MHz FM and 27.93125 MHz FM

9
Hearing locally on my Tecsun portable and via several online receivers on the East Coast of the USA. 

Strong signal on the W3HFU receivers.  Solid SIO 555.  Signal strength a solid S7...peaking up to S8 and S9 at points.  Strong AM modulation, almost exactly 10 kHz wide on 25900 kHz 25.9 MHz

10
AKKORD data link 9.6 kbps 9600bps targeting information for air defense (coming in basically daily at this point).  Via the G8JNJ SDR, tune in time 1344 UTC, writing this at 1345 UTC. 

Frequency 33.4 MHz
Bandwidth approx. 25-30 kHz
FSK variable speed air defense system data link.  Radar site tactical datalink to command center (control center) for possible

S-300 air defense system (NATO reporting name: SA-10 Grumble)
S-400 air defense system (NATO reporting name: SA-21 Growler)

Noting similar data stream signal on 33.500 MHz at the same time, as well as the usual Asian fishermen yakking away Asian fishery radio chatter on:

29.8250 MHz FM
29.8750 MHz FM
29.9625 MHz FM
29.9750 MHz FM
30.1250 MHz FM
33.1000 MHz FM
33.4375 MHz FM
33.5625 MHz FM - with US LMR fire rescue dispatch on 33.560 MHz FM

11

1335 UTC tune in via the G8JNJ SDR.    Narrow FM, 6-7 kHz bandwidth so the nearby POCSAG paging signals and other LMR taxi cab radio taxi dispatch signals aren't too much of an issue. 


Russian taxi controllers on adjacent frequencies 26.225 MHz FM, 26.235 MHz FM, 26.245 MHz FM, 26.255 MHz FM..POCSAG pager signals on 26.200 MHz, 26.220 MHz FM, 26.225 MHz FM, 26.2375 MHz FM 26.250 MHz FM, 26.300 MHz FM, 26.350 MHz FM

12


30.5500 MHz FM - Fishing fleet chatter, likely Japanese language, good signals
30.5750 MHz FM - Military - wideband FM voice comms, UNID language
32.6875 MHz FM - Fishing fleet chatter, fisheries comms Asian fishery radio
32.7500 MHz FM - Military - Data signals, characteristic of encrypted military secure voice comms
32.9500 MHz FM - Military - Data signals, characteristic of encrypted military secure voice comms
33.1250 MHz FM - Military - Data signals, characteristic of encrypted military secure voice comms
33.2500 MHz FM - Military - Data signals, characteristic of encrypted military secure voice comms
33.4000 MHz FM - 30 kHz wide data stream, S9+30dB very strong
33.5000 MHz FM - Data stream, similar to signal on 33.4 MHz 33.400 MHz
33.5600 MHz FM - US LMR - Fire/rescue EMS dispatch and operations comms
33.6200 MHz FM - US LMR - Fire/rescue EMS dispatch and operations comms
33.7500 MHz FM - Data bursts
33.7600 MHz FM - US LMR - Fire/rescue EMS dispatch and operations comms
33.8500 MHz FM - Data bursts, very strong, noted all over 33 MHz band
33.8600 MHz FM - US LMR - Fire/rescue EMS dispatch and operations comms
33.9000 MHz FM - US LMR - Fire/rescue EMS dispatch and operations comms
33.9000 MHz FM - Data bursts, similar to those heard on 33.85 MHz, 33.75 MHz, etc.
33.9200 MHz FM - US LMR - Fire/rescue EMS dispatch and operations comms
33.9400 MHz FM - US LMR - Fire/rescue EMS dispatch and operations comms
34.2250 MHz FM - Turkish forestry radio network with selcall - Turkey wide radio network 34 MHz 
34.2625 MHz FM - Turkish forestry radio network with selcall - Turkey wide radio network 34 MHz 
34.4750 MHz FM - Turkish forestry radio network with selcall - Turkey wide radio network 34 MHz 
34.5625 MHz FM - Turkish forestry radio network with selcall - Turkey wide radio network 34 MHz 
34.6875 MHz FM - Turkish forestry radio network with selcall - Turkey wide radio network 34 MHz 
34.9875 MHz FM - Data bursts, polytone selective calling bursts too
35.0000 MHz FM - Military FM voice comms + secure voice (data)
35.0250 MHz FM - FSK data bursts, possible military datalink
35.0400 MHz FM - US LMR business - itinerant frequency, Spanish language
35.1000 MHz FM - French DDE PMR ePMR land mobile radio network LMR
35.2375 MHz FM - French DDE PMR ePMR land mobile radio network LMR
35.2500 MHz FM - French DDE PMR ePMR land mobile radio network LMR
35.2800 MHz FM - US LMR business radio comms, bus or taxi dispatch
35.3000 MHz FM - Military FM voice comms - US military
35.3000 MHz FM - French DDE PMR ePMR land mobile radio network LMR
35.3125 MHz FM - French DDE PMR ePMR land mobile radio network LMR
35.3200 MHz FM - US LMR business comms, repeater input ? 31.120 MHz FM
35.3600 MHz FM - US LMR business comms
35.4125 MHz FM - French DDE PMR ePMR land mobile radio network LMR
35.4250 MHz FM - French DDE PMR ePMR land mobile radio network LMR
35.4500 MHz FM - French DDE PMR ePMR land mobile radio network LMR
35.5125 MHz FM - French DDE PMR ePMR land mobile radio network LMR
35.5375 MHz FM - French DDE PMR ePMR land mobile radio network LMR
35.5500 MHz FM - POCSAG pager paging signals - UNID source
35.5500 MHz FM - Military FM voice comms, possibly IDF
35.5500 MHz FM - Military - Data signals, characteristic of encrypted military secure voice comms
35.5625 MHz FM - French DDE PMR ePMR land mobile radio network LMR
35.5800 MHz FM - POCSAG paging - very strong signals
35.5875 MHz FM - French DDE PMR ePMR land mobile radio network LMR
35.6000 MHz FM - French DDE PMR ePMR land mobile radio network LMR
35.6125 MHz FM - French DDE PMR ePMR land mobile radio network LMR
35.6250 MHz FM - French DDE PMR ePMR land mobile radio network LMR
35.6625 MHz FM - French DDE PMR ePMR land mobile radio network LMR
35.6750 MHz FM - French DDE PMR ePMR land mobile radio network LMR
35.7000 MHz FM - French DDE PMR ePMR land mobile radio network LMR
35.7125 MHz FM - French DDE PMR ePMR land mobile radio network LMR
35.7250 MHz FM - French DDE PMR ePMR land mobile radio network LMR
35.7375 MHz FM - French DDE PMR ePMR land mobile radio network LMR
35.7600 MHz FM - US LMR - Business radio comms, construction possible user
35.7625 MHz FM - French DDE PMR ePMR land mobile radio network LMR
35.7750 MHz FM - French DDE PMR ePMR land mobile radio network LMR
35.8000 MHz FM - Paging signals, POCSAG pager
35.9250 MHz FM - French DDE PMR ePMR land mobile radio network LMR
36.0375 MHz FM - French DDE PMR ePMR land mobile radio network LMR
36.0625 MHz FM - French DDE PMR ePMR land mobile radio network LMR
36.1500 MHz FM - Military FM voice comms - very heavy QSB
36.1625 MHz FM - French DDE PMR ePMR land mobile radio network LMR
36.2250 MHz FM - Data bursts, about 12.5 kHz wide, MFSK, burst about 1 burst/second
36.9500 MHz FM - Military - Data signals, characteristic of encrypted military secure voice comms
37.0000 MHz FM - Military - Data signals, characteristic of encrypted military secure voice comms
37.0250 MHz FM - Military - Data signals, characteristic of encrypted military secure voice comms
37.0500 MHz FM - Military - wideband FM voice comms, US military UNID location
37.2000 MHz FM - Military - wideband FM voice comms + encrypted voice
37.2250 MHz FM - Russian taxi cab radio system, Moscow? radio taxi dispatch, good signals
38.5250 MHz FM - Russian taxi cab radio system - Moscow YL dispatcher Olga

13
Via the G8JNJ SDR receiver.  In USB mode, tuned in frequency 32.585 MHz.  32587.0 32586.9 kHz

14
Via G8JNJ SDR, tuned in at 1220 UTC.  Very active frequency, 32.687.5 MHz 32687.5 kHz FM NBFM NFM Far east fisheries 12.5 kHz step FM fishing radiotelephone 27.5 MHz - 39.5 MHz - 960 channel version (the official version uses 25 kHz spacing).

Lots of other frequencies are lighting up as I'm typing this, including 32.625 MHz FM [CSQ], 32.900 MHz FM [CSQ]

15
1640 UTC.

UK FM CB Channel 19 on 27.781 MHz FM coming in nicely.  Noted activity on several other UK FM CB frequencies, including 27.731 MHz FM, 27.761 MHz FM, 27.771 MHz FM and others. 

Strong taxi cab radio dispatch traffic on 27.785 MHz AM (and SSB signals on 27.775 MHz USB!) causing heavy QRM to 27.781 MHz FM

Pages: [1] 2 3 4 5 6 7 8 9 ... 198
HFUnderground T-Shirt
HFUnderground Garden Flag
by MitchellTimeDesigns