Topics

31

VHF/UHF Logs, including satellites and radiosondes / Morse S Beacons 32.587 MHz 32.585 MHz USB 1227 UTC 20 Feb 2024

« on: February 20, 2024, 1229 UTC »

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

32

VHF/UHF Logs, including satellites and radiosondes / Asian Fishermen 32.6875 MHz FM [CSQ] Fisheries Chatter 20 Feb 2024

« on: February 20, 2024, 1225 UTC »

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]

33

10/11 meters / UK FM CB 27.78125 MHz FM vs. Mexican Taxi Cab 27.785 MHz FM 02/16/2024

« on: February 16, 2024, 1640 UTC »

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

34

10/11 meters / Paging Signals From Europe / UK Heard In USA - 26.745 MHz and 26.695 MHz

« on: February 16, 2024, 1638 UTC »

Received via local receiver and via the W3HFU KiwiSDR receiver.

UK hospital paging frequency active with non-stop POCSAG paging signals, 26745 kHz 26.745 MHz.  26.695 MHz is also active, but the signal(s) are considerably weaker. 

Received at 1630 UTC (1130 local time). 

Other paging / pager / data frequencies

27.255 MHz FM - Numerous different data signals on frequency, mixing with AM voice and sporadic FM voice
27.195 MHz FM - MFSK data stream, roughly 5-6 kHz bandwidth, constant signal
27.195 MHz FM - Data bursts, 4.5 kHz bandwidth
26.950 MHz FM - Weak data bursts on frequency, various bandwidth signals, 6 kHz, 7.5 kHz
26.950 MHz FM - Data bursts (narrowband) also on frequency - 4 kHz bandwith MFSK
26.950 MHz FM - POCSAG paging signals also on frequency
26.900 MHz FM - Active, POCSAG paging signals (6 kHz bandwidth) and other data signals noted
26.600 MHz FM - Sporadic POCSAG pager signals
26.450 MHz FM - Sporadic POCSAG pager signals
26.350 MHz FM - POCSAG paging signals, also FM carrier on 26.35 MHz noted
26.200 MHz FM - POCSAG signals noted, various bandwidths

35

VHF/UHF Logs, including satellites and radiosondes / VHF Low Band Logs 16 Feb 2024 G8JNJ SDR 1415-1455 UTC

« on: February 16, 2024, 1426 UTC »

30.5800 MHz FM - US LMR comms, construction, truck to truck somms
30.6400 MHz FM - US LMR comms - business radio comms, highway maintenance
31.0800 MHz FM - US LMR comms, bus dispatcher
31.1200 MHz FM - US LMR comms, bus / van dispatcher, very good signals
31.2000 MHz FM - US LMR comms, sounds like construction
32.1800 MHz FM - Taxi cab dispatch, Spanish language, Costa Rica (see also: 32.940 MHz)
33.2000 MHz FM - US LMR comms
33.5000 MHz FM - Data signal, constant stream at 1424 UTC
33.6400 MHz FM - US LMR - fire/rescue dispatch
33.6800 MHz FM - US LMR - fire/rescue dispatch
33.7400 MHz FM - US LMR - fire/rescue dispatch
33.9000 MHz FM - US LMR - fire/rescue dispatch
34.4750 MHz FM - Military comms, UNID language, good strong FM deviation at 1415 UTC
34.5500 MHz FM - Short data bursts,
34.7000 MHz FM - Digital comms, likely encrypted military voice comms, very active
35.0250 MHz FM - Data bursts, ARQ, probably military datalink
35.2500 MHz FM - French DDE ePMR network - voice comms with selcall tone bursts 
35.3375 MHz FM - French DDE ePMR network - voice comms with selcall tone bursts   
35.3500 MHz FM - Military FM voice comms
35.3500 MHz FM - Digital comms, likely encrypted military voice comms, very active
35.4000 MHz FM - Strong data bursts, roughly 10-12 kHz wide
35.4250 MHz FM - French DDE ePMR network - voice comms with selcall tone bursts 
35.4625 MHz FM - French DDE ePMR network - voice comms with selcall tone bursts 
35.5125 MHz FM - French DDE ePMR network - voice comms with selcall tone bursts 
35.5375 MHz FM - French DDE ePMR network - voice comms with selcall tone bursts 
35.5500 MHz FM - Data signals - POCSAG paging - not 35.540 MHz
35.6125 MHz FM - French DDE ePMR network - voice comms with selcall tone bursts 
35.6250 MHz FM - French DDE ePMR network - voice comms with selcall tone bursts 
35.7125 MHz FM - French DDE ePMR network - voice comms with selcall tone bursts 
35.7600 MHz FM - US LMR Business Radio, dispatcher to mobile voice comms
35.7625 MHz FM - French DDE ePMR network - voice comms with selcall tone bursts 

36

10/11 meters / Russian Taxi Cabs Radio Dispatchers Comms 11m/10m G8JNJ SDR 02/16/24

« on: February 16, 2024, 1412 UTC »

Started monitoring at 0645 UTC.  0645 UTC to 0700 UTC on 16 February 2024.

Via G8JNJ online SDR receiver located in the UK.

Russian taxi cab radio comms LMR PMR land mobile radio comms taxi cab dispatchers intruders on 28 MHz taxi cab controllers QRM interference on CB radio on 10 meter band 28MHz band 10 meter band intruders

25635 FM 25.635 MHz FM
25705 FM 25.705 MHz FM
25725 FM 25.725 MHz FM
25740 FM 25.740 MHz FM
25785 FM 25.785 MHz FM
25805 FM 25.805 MHz FM
25825 FM 25.825 MHz FM
25975 FM 25.975 MHz FM
26005 FM 26.005 MHz FM
26055 FM 26.055 MHz FM
26065 FM 26.065 MHz FM
26075 FM 26.075 MHz FM
26095 FM 26.095 MHz FM
26115 FM 26.115 MHz FM
26165 FM 26.165 MHz FM
26175 FM 26.175 MHz FM
26185 FM 26.185 MHz FM
26195 FM 26.195 MHz FM - with some significant QRM from POCSAG pager on 26.2 MHz 26.200 MHz
26205 FM 26.205 MHz FM
26215 FM 26.215 MHz FM
26225 FM 26.225 MHz FM
26235 FM 26.235 MHz FM
26295 FM 26.295 MHz FM
26335 FM 26.335 MHz FM - very strong
26355 FM 26.355 MHz FM
26365 FM 26.365 MHz FM
26415 FM 26.415 MHz FM
26425 FM 26.425 MHz FM
26485 FM 26.485 MHz FM
26500 FM 26.500 MHz FM
26510 FM 26.510 MHz FM
26535 FM 26.535 MHz FM
26570 FM 26.570 MHz FM
26590 FM 26.590 MHz FM
26605 FM 26.605 MHz FM
26625 FM 26.625 MHz FM
26630 FM 26.630 MHz FM
26635 FM 26.635 MHz FM
26655 FM 26.655 MHz FM
26670 FM 26.670 MHz FM
26690 FM 26.690 MHz FM
26715 FM 26.715 MHz FM
26720 FM 26.720 MHz FM
26760 FM 26.760 MHz FM
26795 FM 26.795 MHz FM
26825 FM 26.825 MHz FM
26840 FM 26.840 MHz FM
26845 FM 26.845 MHz FM
26855 FM 26.855 MHz FM
26865 FM 26.865 MHz FM
26870 FM 26.870 MHz FM
26895 FM 26.895 MHz FM
26920 FM 26.920 MHz FM
26955 FM 26.955 MHz FM

26985 FM 26.985 MHz FM
27030 FM 27.030 MHz FM
27050 FM 27.050 MHz FM
27055 FM 27.055 MHz FM
27060 FM 27.060 MHz FM
27070 FM 27.070 MHz FM
27100 FM 27.100 MHz FM
27110 FM 27.110 MHz FM
27150 FM 27.150 MHz FM
27200 FM 27.200 MHz FM
27210 FM 27.210 MHz FM
27250 FM 27.250 MHz FM
27330 FM 27.330 MHz FM
27335 FM 27.335 MHz FM

27420 FM 27.420 MHz FM
27430 FM 27.430 MHz FM
27470 FM 27.470 MHz FM
27485 FM 27.485 MHz FM
27515 FM 27.515 MHz FM
27540 FM 27.540 MHz FM
27575 FM 27.575 MHz FM
27585 FM 27.585 MHz FM
27600 FM 27.600 MHz FM - right on 27.600 MHz, some QRM from UK FM CB on 27.60125 MHz FM
27625 FM 27.625 MHz FM
27665 FM 27.665 MHz FM
27735 FM 27.735 MHz FM
27745 FM 27.745 MHz FM
27755 FM 27.755 MHz FM
27775 FM 27.775 MHz FM
27805 FM 27.805 MHz FM
27815 FM 27.815 MHz FM
27825 FM 27.825 MHz FM
27835 FM 27.835 MHz FM
27845 FM 27.845 MHz FM
27865 FM 27.865 MHz FM
27885 FM 27.885 MHz FM with QRM from POCSAG paging pager system on 27.885 MHz
27900 FM 27.900 MHz FM
27905 FM 27.905 MHz FM
27915 FM 27.915 MHz FM
27925 FM 27.925 MHz FM
27935 FM 27.935 MHz FM
27945 FM 27.945 MHz FM
27955 FM 27.955 MHz FM
27965 FM 27.965 MHz FM
27975 FM 27.975 MHz FM
27985 FM 27.985 MHz FM

28005 FM 28.005 MHz FM
28055 FM 28.055 MHz FM
28095 FM 28.095 MHz FM
28115 FM 28.115 MHz FM
28125 FM 28.125 MHz FM
28145 FM 28.145 MHz FM
28175 FM 28.175 MHz FM
28195 FM 28.195 MHz FM
28215 FM 28.215 MHz FM
28225 FM 28.225 MHz FM
28245 FM 28.245 MHz FM
28255 FM 28.255 MHz FM
28265 FM 28.265 MHz FM
28275 FM 28.275 MHz FM
28295 FM 28.295 MHz FM
28305 FM 28.305 MHz FM
28315 FM 28.315 MHz FM
28335 FM 28.335 MHz FM
28375 FM 28.375 MHz FM
28445 FM 28.445 MHz FM
28485 FM 28.485 MHz FM
28495 FM 28.495 MHz FM
28505 FM 28.505 MHz FM
28535 FM 28.535 MHz FM
28755
28765 FM 28.765 MHz FM
28775 FM 28.775 MHz FM
28885 FM 28.885 MHz FM
28905 FM 28.905 MHz FM
28965 FM 28.965 MHz FM
28985 FM 28.985 MHz FM
29035 FM 29.035 MHz FM
29105 FM 29.105 MHz FM
29115 FM 29.115 MHz FM
29635 FM 29.635 MHz FM

29755 FM 29.755 MHz FM
29815 FM 29.815 MHz FM
29875 FM 29.875 MHz FM
29905 FM 29.905 MHz FM
29915 FM 29.915 MHz FM
29925 FM 29.925 MHz FM
29965 FM 29.965 MHz FM

37

10/11 meters / 26.765 MHz AM Taxi Radio Dispatch Comms 2045 UTC 9 Feb 2024

« on: February 09, 2024, 2046 UTC »

26.765 MHz AM 26765 kHz AM 26,765 MHz kHz AM mode taxi cab dispatch out of Mexico Mexican radio taxi dispatch strong signal, very good copy on YL dispatcher at 2045 UTC. 

Received locally and via both the W3HFU SDR and N1NTE SDR online receivers.  26.7650 MHz AM is coming in almost daily now.  Nearly as reliable as 26.585 MHz AM, 26.555 MHz LSB, 27.455 MHz USB and the other calling frequencies. 

Noted activity on 26.755 MHz AM, 26.795 MHz AM, 26.805 MHz FM and others around the same time.

38

10/11 meters / 27.815 MHz AM Taxi Radio Dispatch Comms 2040 UTC 9 Feb 2024

« on: February 09, 2024, 2043 UTC »

27815 AM 27815 kHz AM 27,815 27.8150 MHz AM taxi cab radio dispatch Latin America likely Mexico Mexican taxi cab radio land mobile communications system, YL dispatcher SIO 222, weaker than usual when the band is open. 

Some minor SSB QRM, also Spanish language, freeband CB radio chatter. 

27.815MHz is Channel 36 up one band, or Band E on most export radios.  27.365 MHz CB channel 36 up one band is 27.815 MHz. 

39

10/11 meters / 25.695 MHz AM Taxi Radio Dispatch Comms 2030 UTC 9 Feb 2024

« on: February 09, 2024, 2039 UTC »

Received via the W3HFU KiwiSDR receiver, tuned in at 2030 UTC (3:30pm local time).  SIO 333 taxi dispatch radio YL dispatcher lady Spanish language.  Some minor fading, good AM audio this afternoon. 

Frequency 25695 kHz AM 25.6950 MHz AM 25,695 MHz AM

taxi dispatch lady reading alphanumeric taxi IDs, trip/ride identifiers, other IDs over the air.  Mexico taxi radio comms 25 MHz band 25.615 MHz - 26.055 MHz Band A export radios, 25.695 MHz is channel 7A on Band A, so channel 7 +10 kHz.  25.685 MHz +10k switch. 

40

VHF/UHF Logs, including satellites and radiosondes / VHF Low Band Logs 3 Feb 2024 G8JNJ SDR 1415-1455 UTC

« on: February 03, 2024, 1454 UTC »

Some quick low band VHF logs - G8JNJ SDR.  1415 UTC to 1455 UTC 3 February 2024


29.7500 MHz FM - OTH Radar - 60 kHz bandwidth 60kHz BW
29.8000 MHz FM - POCSAG paging signals - see also: 29.900 MHz FM
29.8500 MHz FM - Strong OTH Radar with "horn" sound in FM mode, 50-60 kHz bandwidth
29.8550 MHz FM - Taxi cab dispatch, Russian language Russian YL taxi cab dispatch 29.855 MHz FM
29.9000 MHz FM - POCSAG paging signals - well known pager frequency, see also: 29.8 MHz
29.9150 MHz FM - Taxi cab dispatcher - Russia Russian YL taxi cab lady 29.915MHz FM
29.9250 MHz FM - Asian fishery radio chatter, fisheries comms 29.925 MHz FM [CSQ]
29.9550 MHz FM - Russian taxi cab dispatch, heavy fading
29.9650 MHz FM - Taxi cab dispatch, Russian language Russia taxi cab company comms 29.965 MHz FM
29.9950 MHz FM - Carrier signal
30.0000 MHz FM - Carrier signal - not a chirper
30.0200 MHz FM - POCSAG paging signals on waterfall, likely Canadian hospital pagers 30.020 MHz FM
30.0250 MHz FM - Military FM signals noted, short transmissions
30.1000 MHz FM - UNID FM comms - possibly Asian fishery radio chatter 30.100 MHz FM CSQ
30.1550 MHz FM - MFSK data bursts
30.1750 MHz FM - Data bursts
30.2250 MHz FM - Asian fishery radio chatter, fisheries comms 30.225 MHz FM [CSQ]
30.2500 MHz FM - OTH Radar, 50 kHz bandwidth
30.3750 MHz FM - Weak military FM comms, unable to ID
30.4000 MHz FM - Asian fishery radio chatter fisheries comms 30.400 MHz FM [CSQ] 30.4 MHz FM
30.5500 MHz FM - Military FM tactical comms (clear voice), very heavy fading
30.5500 MHz FM - Data signals - 14-16 kHz wide, could be secure voice military comms
30.5750 MHz FM - Military FM tactical comms, tell-tale wide FM deviation
30.6400 MHz FM - US LMR business radio - dispatcher talking to mobiles
30.6500 MHz FM - Military encrypted voice comms - very strong
30.7250 MHz FM - Asian fishery radio chatter, fisheries comms 30.725 MHz FM [CSQ]
30.8000 MHz FM - Asian fishery radio chatter, fisheries comms 30.800 MHz FM [CSQ]
30.8200 MHz FM - US Land Mobile chatter, heavy fading
30.9000 MHz FM - POCSAG pager paging signals
30.9200 MHz FM - US LMR - strong signals, previously logged
31.0000 MHz FM - Strong OTH Radar, 100 kHz BW
31.0750 MHz FM - Asian fishery radio chatter, fisheries radiotelephone 31.075 MHz FM CSQ
31.1000 MHz FM - Asian fishery radio chatter, fisheries comms 31.100 MHz FM [CSQ]
31.1200 MHz FM - US LMR business comms - bus dispatcher, strong signals
31.1750 MHz FM - Asian fishery radio chatter, fisheries comms 31.175 MHz FM [CSQ]
31.1750 MHz FM - Wideband data signals, likely encrypted mil comms
31.2250 MHz FM - Asian fishery radio chatter, heavy fading, busy frequency 31.225 MHz FM [CSQ] fisheries
31.2400 MHz FM - US LMR Part 90 comms - possibly highway maintenance
31.3000 MHz FM - Military FM comms, clear voice with strong AC hum, possibly IDF
31.3200 MHz FM - POCSAG pager paging signals, mixing with data on 31.325 MHz
31.3250 MHz FM - EPAR data signal, polytone French traffic signal control link 31.325 MHz FM
31.3400 MHz FM - Weak POCSAG paging signal
31.4400 MHz FM - US LMR comms, business dispatch
31.5500 MHz FM - UNID military FM comms, unknown language, wide FM deviation
31.5750 MHz FM - Chirper, roughly 18 kHz wide center frequency 31.575 MHz
31.6000 MHz FM - US LMR business comms, sporadic signal
31.6250 MHz FM - Asian fishery radio chatter, fisheries comms 31.625 MHz FM [CSQ] - weak with heavy fading
31.6400 MHz FM - "Hey Doug, it's a fenced in area" - US business comms, good signals at 1415 UTC
31.7000 MHz FM - Asian fishery radio chatter, fisheries comms 31.700 MHz FM [CSQ]
31.7500 MHz FM - POCSAG paging signals - UK hospital pagers
31.9600 MHz FM - US LMR, bus or taxi dispatcher
32.0750 MHz FM - Asian fishery radio chatter, fisheries comms 32.075 MHz FM [CSQ]
32.1800 MHz FM - Costa Rica taxi cab dispatch - 77.0 Hz / 141.3 Hz, also on 32.940 MHz FM
32.2250 MHz FM - Asian fishery radio chatter, fisheries comms 32.225 MHz FM [CSQ]
32.3250 MHz FM - Very strong "chirper" signal
32.8000 MHz FM - Military comms, secure mode digital signals, 18 kHz bandwidth, very strong bursts
32.9000 MHz FM - Asian fishery radio chatter, fisheries comms 32.900 MHz FM [CSQ]
33.0400 MHz FM - US LMR, fire rescue EMS dispatch
33.4000 MHz FM - Strong data bursts
33.5200 MHz FM - US LMR, fire rescue EMS dispatch
33.5500 MHz FM - Encrypted military comms
33.5600 MHz FM - US LMR, fire rescue EMS dispatch
33.5800 MHz FM - US LMR, fire rescue EMS dispatch
33.6600 MHz FM - US LMR, fire rescue EMS dispatch
33.6800 MHz FM - US LMR, fire rescue EMS dispatch
33.7000 MHz FM - US LMR, fire rescue EMS dispatch
33.7400 MHz FM - US LMR, fire rescue EMS dispatch
33.7800 MHz FM - US LMR, fire rescue EMS dispatch
33.8250 MHz FM - UNID military FM voice signals, heavy fading
33.8400 MHz FM - US LMR, fire rescue EMS dispatch
33.8800 MHz FM - US LMR, fire rescue EMS dispatch 
33.9000 MHz FM - Strong data bursts
33.9000 MHz FM - US LMR, fire rescue EMS dispatch
33.9600 MHz FM - US LMR, fire rescue EMS dispatch
34.5500 MHz FM - Short data bursts, 25 kHz bandwidth
34.8000 MHz FM - Data bursts, previously logged

41

10/11 meters / 26.765 MHz AM Taxi Radio Dispatch Comms 1945 UTC 2 Feb 2024

« on: February 02, 2024, 1947 UTC »

Listening locally and via the W3HFU SDR.  26765 kHz AM 26,765 AM 26.765 MHz AM Spanish taxi cab radio taxi dispatcher SS YL taxi lady.

Signal strength peaking at S-5 at 1945 UTC / 1946 UTC on the W3HFU SDR with the T2FD antenna.  Strong AM modulation.

42

10/11 meters / 29.889 MHz USB Portuguese Chatter 29.888.8 UNID - Fishing Fleet? 02/02/2024

« on: February 02, 2024, 1355 UTC »

Another odd find via the excellent G8JNJ SDR receiver.  Tuned in at 1352 UTC.  Two OMs chatting, reminds me very much of 6925 kHz LSB Portuguese language chatter.  Probably pescadores on another super secret squirrel frequency!

29889 kHz USB 29.889MHz USB out of band Portuguese chatter.  Stations actually seem to be right on 29888.8 kHz USB or 29.888.8 MHz USB.  29.888 MHz 29.8888 MHz USB 29.7 MHz - 30.0 MHz 30-88 MHz. 


At the same time, POCSAG paging signals were just starting to fade in on 29.800 MHz and 29.900 MHz.  Russian taxi dispatch radio chatter on 29.855 MHz FM, 29.915 MHz FM and 29.965 MHz FM around the same time.  No sign of the Asian fisheries guys on their usual hangouts 29.775 MHz FM, 29.825 MHz FM, 29.875 MHz FM, 29.975 MHz FM, etc. but they seem to come and go at seemingly odd times given their (presumed) location(s). 

43

10/11 meters / Russian Taxi Cabs Radio Dispatchers On 10 Meters 02/02/2024

« on: February 02, 2024, 1337 UTC »

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

44

VHF/UHF Logs, including satellites and radiosondes / Fishing Fleet Chatter Asian Fisheries 12.5 kHz channels 29.9375 MHz 30.0125 MHz

« on: January 30, 2024, 2000 UTC »

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

45

VHF/UHF Logs, including satellites and radiosondes / Data Links 33.400 MHz and 35.550 MHz G8JNJ SDR 30 January 2024

« on: January 30, 2024, 1607 UTC »

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