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Messages - R4002

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106
I just did some quick updates - and will be fixing the formatting too.


107
2023 confirmed active 11 meter band 26mhz band Internet Gateway connections, simplex repeaters CB repeater list 27MHz repeaters and yes full-duplex repeaters.

List of confirmed active

Full duplex CB repeater Germany

27.405 MHz FM output
26.565 MHz FM input

Channel 41 FM in, Channel 40 FM out.

Simplex repeaters.  FM mode.

27.205 MHz FM - New Zealand Simplex CB Repeater CH 20 FM CB Radio channel 20 FM.  Several other repeaters active on 27205 FM, most of them in Europe. 

27.005 MHz FM - Multiple simplex repeaters active - Europe / Russia - CB Channel 4 FM

27.055 MHz FM - Multiple CB repeaters CB channel 8 FM.  Simplex repeaters repeating each other 27055 FM.

27.055 MHz FM - Germany CB Simplex Repeater

27.275 MHz FM - Sweden - Simplex CB Channel 27 FM repeater Swedish

27.295 MHz FM - Sweden - Simplex CB Channel 29 FM repeater Swedish

27.060 MHz FM - Simplex Repeater - Eastern Europe / Russia, active.  Repeater in Kiev Ukraine on this frequency 27060 FM unknown if this is the repeater heard.

27.065 MHz FM - Simplex Repeater - Russia (multiple repeaters on 27065 FM) CB Channel 9 FM

27.330 MHz FM - Belarus Simplex Repeater 27330 FM 27.330MHz FM

27.350 MHz FM - Belarus Simplex Repeater 27350 FM 27.350MHz FM

27.100 MHz FM - Krasnodar Russia active 27100 FM 27,100 kHz FM

26.805 MHz FM - Germany simplex CB repeater 26805 FM

26.885 MHz FM - Germany simplex CB repeater 26885 FM 

26.895 MHz FM - Simplex 11m repeater 26895 FM - internet gateways active on this frequency

26.875 MHz FM

Internet Gateway Connections
26.875 MHz FM
26.875 MHz FM 88.5 Hz tone 26875FM
26.755 MHz FM 88.5 Hz CTCSS 26755 FM
26.755 MHz FM 100.0 Hz CTCSS 26755 FM

27.055 MHz FM Germany
27.055 MHz FM Another location - Central Europe / Eastern Europe
27.205 MHz AM New Zealand 27.205 MHz AM simplex repeater CB Channel 20 AM New Zealand 27205 AM CB radio repeater


27.350 MHz FM Belarus -
27.355 MHz FM Russia CB channel 35
26.935 MHz FM
26.945 MHz FM Internet gateway
26.955 MHz FM Internet gateway
26.895 MHz FM Czech Republic channel 74
26.875 MHz FM Czech Republic Ch. 72 [88.5 Hz]
26.755 MHz FM Czech [88.5 Hz]
26.755 MHz FM Czech [100.0 Hz CTCSS PL tone]
26.855 MHz FM
26.875 MHz FM [100.0 Hz]
26.845 MHz FM [88.5 Hz]
26.845 MHz FM [94.8 Hz]
26.865 MHz FM [88.5 Hz]
26.825 MHz FM
26.785 MHz FM
26.775 MHz FM
26.685 MHz FM
26.675 MHz FM
26.615 MHz FM
26.685 MHz FM [88.5 Hz CTCSS tone]
26.685 MHz FM [94.8 Hz CTCSS tone]
26.635 MHz FM [88.5 Hz CTCSS tone]
26.635 MHz FM [CSQ]

27.060 MHz FM Russia
27.060 MHz FM Ukraine (Kiev) - possibly off the air? 
27.065 MHz FM Russia CB Channel 9 repeater CB Channel 9 FM
27.070 MHz FM Russia
27.100 MHz FM Krasnodar Russia CB repeater 27100 FM 27,100 MHz FM
27.005 MHz FM Multiple repeaters CB CH 4 FM 27005 FM
27.035 MHz FM Multiple repeaters CB CH 7 FM 27035 FM
26.885 MHz FM Germany Channel 73
26.805 MHz FM Germany Channel
27.265 MHz FM Russia CB Repeater Channel 26 FM 27265 FM
27.085 MHz FM Russia CB Repeater CB CH 11FM
27.285 MHz FM Russian CB repeater 27285 FM 27.285MHz FM
27.035 MHz FM Sweden CB CH7 FM Swedish CB repeater 11M repeater 27MHz simplex repeater
27.075 MHz FM Russia CB Repeater Channel 10 FM
27.275 MHz FM Russia CB Repeater Channel 27 FM
27.105 MHz FM Russia CB Repeater Channel 12 FM
27.005 MHz FM Russia CB Repeater Channel 4 FM 27005 FM
27.000 MHz FM Russian CB 11M repeater 27.000MHz FM
27.140 MHz FM Russia CB repeater 27140 kHz 27140 FM
27.145 MHz FM Eastern Europe Channel 15A
27.395 MHz FM Russia 27.395 MHz FM CB Channel 39 FM repeater
27.415 MHz FM Russia 27.415 MHz FM CB Channel D01FM E01FM
27.295 MHz FM Russia CB repeater channel 29 CB CH29 FM repeater
26.675 MHz FM Russia 26,675 kHz 26.675 MHz repeater 26MHz band
27.200 MHz FM Russia 27.200 MHz FM 27.200 FM
27.275 MHz FM Unknown - Europe?  27.275 MHz FM repeater 27MHz simplex repeater
27.150 MHz FM Russia
27.295 MHz FM Sweden CB Repeater CH29 FM 27295 FM
27.295 MHz FM Russia CB Repeater CB 29 FM 27,295 FM repeater
27.605 MHz FM Russia 88.5 Hz
27.675 MHz FM Russia 88.5 Hz
27.415 MHz FM Russia 88.5 Hz - multiple repeaters on frequency 27415 27.415
27.275 MHz FM Sweden - CB Channel 27 FM Simplex Repeater
27.205 MHz FM Sweden - CB Channel 20 FM Simplex Repeater Beacon DTMF
26.985 MHz FM Russia - CB Channel 3 FM Simplex Repeater
27.635 MHz FM Russia
27.025 MHz FM Russia - CB Channel 6 FM Simplex Repeater
27.190 MHz FM Russia
27.180 MHz FM Russia

108
29.875 MHz is apparently one of the more popular frequencies for these guys.  I thought 31.100 MHz and 31.800 MHz were busy but 29875 FM is basically nonstop. 

27.750 MHz FM, 27.775 MHz FM, 27.900 MHz FM, 27.975 MHz FM, 28.000 MHz FM and numerous frequencies within 10 meters are also busy.  29.150 MHz FM seems to be the most popular one, with the Russian taxi cabs mixing in.

109



29.7050 MHz FM - FSK signal, basically nonstop
29.7400 MHz FM - FSK bursts, 29.739 MHz USB frequency)
29.7600 MHz FM - FSK signal, nonstop (29.758 MHz USB or 29.759 MHz USB)
29.8000 MHz FM - POCSAG paging pager signals 29.8 MHz
29.8250 MHz FM - Weak FM chatter, probably Asian fishery radio chatter
29.8450 MHz FM - FSK, 29.843 MHz USB window frequency
29.9000 MHz FM - POCSAG paging pager signals 29.9 MHz - very strong at 1745 UTC onward
29.9250 MHz FM - Asian fishery radio chatter, OTH Radar QRM
29.9400 MHz FM - Other the horizon radar, roughly 60 kHz wide, center freq 29.94 MHz
30.0000 MHz FM - Carriers, one on 29.9995 MHz, another "chirping" on 30.000 MHz up to 30.001 MHz
30.0000 MHz FM - Military FM comms, maybe radio tests? 30.0001 MHz
30.0000 MHz FM - Yet another FM carrier,
30.1000 MHz FM - Paging - POCSAG, very dramatic fading
30.1550 MHz FM - FSK data bursts, weak
30.3250 MHz FM - Asian fishery radio chatter
30.3500 MHz FM - Military FM comms, very wide FM deviation, unable to ID
30.3600 MHz AM - Indian music, probably broadcast harmonic 15.180 MHz?, fading up to S6, down into the noise
30.4000 MHz FM - UNID two-way comms, not sure of language
30.4125 MHz FM - UNID language, possibly also fishery radio comms?
30.4200 MHz AM - Broadcast harmonic - 30.420.5 MHz
30.5750 MHz FM - Military FM comms, sounds like US military? heavily distorted 
30.6750 MHz FM - Digital two-way comms (probably military going by bandwidth)
30.7250 MHz FM - Asian fishery radio chatter
30.9000 MHz FM - POCSAG paging pager signals
30.9000 MHz FM - FSK data, not POCSAG
31.1250 MHz FM - Asian fishery radio chatter
31.1300 MHz FM - UNID two-way comms, narrow FM
31.2000 MHz FM - Spanish language taxi dispatch - YL dispatcher
31.3200 MHz FM - POCSAG paging
31.3250 MHz FM - French EPAR traffic light control data (polytone)
31.4250 MHz FM - French EPAR traffic light control data (polytone)
31.4375 MHz FM - UNID two-way FM comms (NFM, likely LMR)
31.4750 MHz FM - French EPAR traffic light control data (polytone)
31.5250 MHz FM - Military FM comms, very wide FM deviation, unable to ID
31.5250 MHz FM - FM carrier, fading in and out
31.5250 MHz FM - Asian fishery chatter also on frequency
31.6875 MHz FM - French EPAR traffic light control data (polytone) 
31.7250 MHz FM - POCSAG paging - UK hospital pagers
31.7500 MHz FM - POCSAG paging - UK hospital pagers
31.7750 MHz FM - POCSAG paging - UK hospital pagers
31.8000 MHz FM - Asian fishery radio chatter
31.9750 MHz FM - French EPAR traffic light control data (polytone)
32.0450 MHz FM - FSK signal, 32.043 MHz USB tuning
32.1800 MHz FM - Spanish language taxi dispatch - Costa Rica taxi
32.3250 MHz FM - Asian fishery radio chatter
32.4500 MHz FM - FSK bursts
32.9000 MHz FM - Military FM comms, very wide FM deviation, unable to ID
32.9400 MHz FM - Weak FM LMR - Costa Rican taxi cab dispatcher
32.9450 MHz FM - AM? possible broadcast harmonic?
32.9750 MHz FM - MFSK data signal (3 subcarriers, -2.3 kHz, center freq and +2.3 kHz)
33.3250 MHz FM - FSK data bursts
33.3300 MHz FM - Russian language, NFM, possible land mobile radio
33.4500 MHz FM - Strong FSK signal
33.4625 MHz FM - Weak two-way FM comms
33.9000 MHz FM - Asian fishery radio chatter
33.9250 MHz FM - Asian fishery radio chatter
34.9625 MHz FM - French language, French LMR
35.0125 MHz FM - French language, French LMR
35.0250 MHz FM - French language, French LMR
35.0500 MHz FM - French language, French LMR
35.0625 MHz FM - French language, French LMR
35.0750 MHz FM - French language, French LMR
35.1000 MHz FM - French language, French LMR
35.1625 MHz FM - French language, French LMR
35.2000 MHz FM - French language, French LMR
35.2125 MHz FM - French language, French LMR
35.2250 MHz FM - French language, French LMR
35.2500 MHz FM - French language, French LMR
35.2750 MHz FM - French language, French LMR 
35.3125 MHz FM - French language, French LMR
35.3375 MHz FM - French language, French LMR
35.3500 MHz FM - French language, French LMR
35.3625 MHz FM - French language, French LMR
35.3750 MHz FM - French language, French LMR
35.4000 MHz FM - French language, French LMR
35.4000 MHz FM - Paging - POCSAG pager
35.4125 MHz FM - French language, French LMR
35.4250 MHz FM - French language, French LMR
35.4750 MHz FM - French language, French LMR
35.4875 MHz FM - Open carrier
35.5000 MHz FM - French language, French LMR
35.5000 MHz FM - POCSAG paging pager
35.5125 MHz FM - French language, French LMR
35.5375 MHz FM - French language, French LMR
35.5500 MHz FM - POCSAG paging pager
35.5500 MHz FM - French language, French LMR
35.5625 MHz FM - French language, French LMR
35.6000 MHz FM - French language, French LMR
35.6000 MHz FM - Data bursts, FSK
35.6250 MHz FM - French language, French LMR
35.6375 MHz FM - French language, French LMR
35.6875 MHz FM - French language, French LMR
35.7000 MHz FM - French language, French LMR
35.7250 MHz FM - French language, French LMR
35.7750 MHz FM - French language, French LMR
35.7800 MHz FM - POCSAG (weak)
35.7875 MHz FM - French language, French LMR
35.8000 MHz FM - French language, French LMR
35.8875 MHz FM - French language, French LMR
35.9625 MHz FM - French language, French LMR
36.1125 MHz FM - French language, French LMR
36.1250 MHz FM - Possibly Farsi?   
36.1250 MHz FM - French language, French LMR
36.1500 MHz FM - Paging?
36.1625 MHz FM - Heavily distorted audio
36.1625 MHz FM - French language, French LMR
36.2375 MHz FM - French language, French LMR
36.5000 MHz FM - Spanish language taxi cab dispatcher
37.7000 MHz FM - Military FM comms, very wide FM deviation, unable to ID
38.1000 MHz FM - Military FM comms, very wide FM deviation, unable to ID
38.5250 MHz FM - Military FM comms, very wide FM deviation, unable to ID
38.6600 MHz FM - Spanish language taxi cab dispatcher
38.7250 MHz FM - Military FM comms, very wide FM deviation, unable to ID
40.0125 MHz FM - POCSAG paging - Italian hospital pager systems
40.0375 MHz FM - POCSAG paging - Italian hospital pager systems
40.0625 MHz FM - POCSAG paging - Italian hospital pager systems
40.0875 MHz FM - POCSAG paging - Italian hospital pager systems
40.6600 MHz FM - POCSAG paging signals
40.6650 MHz FM - POCSAG paging, nonstop POCSAG paging signal
40.6650 MHz FM - Another POCSAG pager on top of the "base" signal
40.6700 MHz FM - FM carrier
40.6700 MHz FM - Polytone data FSK signal - looks like ROS on the waterfall
40.6700 MHz CW - Morse ID? beacon?
40.6700 MHz FM - POCSAG paging - numerous paging signals mixing together
40.6750 MHz FM - FSK data
40.6750 MHz FM - POCSAG paging signals
40.6800 MHz FM - FM carrier
40.6800 MHz FM - POCSAG paging - various bandwidths at once
40.6850 MHz FM - Polytone data (FSK)
40.6850 MHz FM - POCSAG paging
40.6875 MHz FM - POCSAG paging
40.6900 MHz FM - FM carrier
40.6900 MHz FM - POCSAG paging - very strong POCSAG pager
40.6950 MHz FM - Nonstop data signal
40.7000 MHz FM - POCSAG paging signals
40.7125 MHz FM - FM carrier
40.7375 MHz FM - FM carrier, fading in and out
40.8800 MHz FM - FSK bursts, similar to those heard on 40.9925 MHz 
40.8850 MHz FM - FSK data bursts, also POCSAG
40.8875 MHz FM - FSK bursts, similar to those heard on 40.9925 MHz
40.8925 MHz FM - FSK bursts, similar to those heard on 40.9925 MHz
40.9000 MHz FM - FSK bursts, similar to those heard on 40.9925 MHz
40.9050 MHz FM - FSK bursts, similar to those heard on 40.9925 MHz
40.9125 MHz FM - FSK bursts, similar to those heard on 40.9925 MHz 
40.9150 MHz FM - FM carrier
40.9150 MHz FM - FSK bursts, similar to those heard on 40.9925 MHz
40.9200 MHz FM - FSK bursts, similar to those heard on 40.9925 MHz
40.9250 MHz FM - FSK bursts, similar to those heard on 40.9925 MHz
40.9275 MHz FM - FSK bursts, similar to those heard on 40.9925 MHz
40.9300 MHz FM - FSK bursts, similar to those heard on 40.9925 MHz
40.9350 MHz FM - FSK bursts, similar to those heard on 40 MHz / 41 MHz
40.9425 MHz FM - FSK bursts, similar to those heard on 40.9925 MHz
40.9500 MHz FM - FSK bursts, similar to those heard on 40.9925 MHz
40.9550 MHz FM - FSK bursts, similar to those heard on 40.9925 MHz
40.9625 MHz FM - FSK bursts, similar to those heard on 40.9925 MHz
40.9750 MHz FM - FSK bursts, similar to those heard on 40.9925 MHz
40.9800 MHz FM - FSK bursts, similar to those heard on 40.9925 MHz
40.9850 MHz FM - FSK bursts, similar to those heard on 40.9925 MHz
40.9950 MHz FM - FSK bursts, similar to those heard on 40.9925 MHz 
40.9925 MHz FM - FSK bursts, very rapid - reminds me of the data networks heard on 26-28 MHz
40.9950 MHz FM - FSK bursts
41.0000 MHz FM - FSK bursts
41.0050 MHz FM - FSK bursts, similar to those heard on 40.9925 MHz
41.0125 MHz FM - FSK bursts
41.0250 MHz FM - POCSAG paging signals, lots of QRM from the various data links on/nearby frequency
41.0375 MHz FM - POCSAG paging, FSK bursts mixing in
41.0475 MHz FM - FSK bursts
41.0500 MHz FM - FSK bursts
41.0625 MHz FM - FSK bursts
41.0650 MHz FM - FSK bursts

110
Via G8JNJ SDR receiver. 

1100 UTC - 1130 UTC



29.7000 MHz FM - Multi-tone FSK MFSK signal (centered on 29.7 MHz)
29.7050 MHz USB - Narrowband FSK signal - short bursts
29.7500 MHz FM - POCSAG paging signals
29.7700 MHz FM - FSK bursts
29.7750 MHz FM - Asian fishery radio chatter
29.8000 MHz FM - POCSAG paging signals
29.8150 MHz AM - French language chatter - out of band freeband CBers outbanders
29.8250 MHz FM - Asian fishery radio chatter
29.8400 MHz FM - FSK signals
29.8750 MHz FM - Asian fishery radio chatter, very busy at points
29.8875 MHz FM - LMR radio two-way comms, Russian language
29.9000 MHz FM - POCSAG paging signals
29.9150 MHz AM - French language chatter - out of band CB operators
29.9250 MHz FM - Asian fishery radio chatter
29.9950 MHz FM - Carrier on and off, 3-4 second "ON" duration
29.9990 MHz FM - Carriers
30.0000 MHz FM - Carriers, "chirp" signals
30.0000 MHz FM - Military FM wide deviation signals, short bursts
30.0015 MHz FM - Carriers
30.0250 MHz FM - Military FM comms
30.0550 MHz FM - UNID two-way comms, possible CB or freebander / outbander activity
30.0750 MHz FM - Asian fishery radio chatter, mixing with weak data bursts
30.1000 MHz FM - Weak POCSAG paging signals
30.1250 MHz FM - Asian fishery radio chatter
30.1550 MHz FM - FSK data bursts
30.2000 MHz FM - Military FM comms, UNID source
30.2500 MHz FM - Asian fishery radio chatter
30.2600 MHz FM - UNID language, two-way comms
30.2750 MHz FM - FSK data bursts
30.3000 MHz FM - Military FM comms, then encrypted digital comms
30.3250 MHz FM - Asian fishery radio chatter
30.4000 MHz FM - Digital two-way comms, possibly encrypted military
30.4800 MHz FM - Two-way LMR comms, NFM, not military
30.5000 MHz FM - UNID comms, Arabic language, not military deviation
30.5250 MHz FM - Digital two-way comms, possibly encrypted military
30.5450 MHz FM - FSK data bursts, weak signals but pretty frequent
30.5750 MHz FM - Asian fishery radio chatter
30.6375 MHz FM - Somebody doing radio checks?  keyups, no audio - not 30.640 MHz
30.6500 MHz FM - Asian fishery radio chatter
30.6750 MHz FM - Wideband data? 20 kHz wide, bursts 1-2 to 6-7 seconds long, S8-S9
30.6800 MHz FM - FM carrier, weak signal fading in and out
30.6875 MHz FM - FM carrier, very weak audio heard
30.7000 MHz FM - POCSAG paging signals
30.7250 MHz FM - Asian fishery radio chatter
30.7450 MHz FM - Weak FM two-way LMR type signals, UNID language
30.7500 MHz FM - Asian fishery radio chatter
30.8000 MHz FM - Asian fishery radio chatter
30.8750 MHz FM - FSK data bursts, similar to data heard on 30.155 MHz
30.9000 MHz FM - FSK data signals, *not* POCSAG on same frequency
30.9000 MHz FM - POCSAG paging signals
30.9250 MHz FM - Military comms UNID source - tell-tale wide FM deviation
30.9300 MHz FM - Weak FM two-way comms, heavy fading
30.9625 MHz FM - UNID FM two-way comms, very weak
31.0000 MHz FM - Data signals - seemed like encrypted military comms
31.0250 MHz FM - Military comms UNID source - tell-tale wide FM deviation
31.1000 MHz FM - Asian fishery radio chatter
31.1500 MHz FM - POCSAG paging bursts, lots of fading
31.1750 MHz FM - Asian fishery radio chatter
31.1950 MHz FM - UNID two-way comms
31.2000 MHz FM - Asian fishery radio chatter
31.2650 MHz FM - Russian? language chatter, not military
31.2850 MHz FM - UNID two-way comms
31.3000 MHz FM - Military comms UNID source - tell-tale wide FM deviation
31.3200 MHz FM - POCSAG paging signals - weak
31.3250 MHz FM - French EPAR multi-tone traffic signal control data bursts
31.3875 MHz FM - French EPAR multi-tone traffic signal control data bursts
31.4000 MHz FM - Digital two-way comms, possibly encrypted military
31.4250 MHz FM - French EPAR multi-tone traffic signal control data bursts
31.5000 MHz FM - Digital two-way comms, possibly encrypted military
31.6750 MHz FM - Asian fishery radio chatter
31.6875 MHz FM - French EPAR multi-tone traffic signal control data bursts
31.7250 MHz FM - POCSAG paging - UK hospital pagers
31.7500 MHz FM - POCSAG paging - UK hospital pagers - busiest frequency
31.7750 MHz FM - Asian fishery radio chatter
31.7750 MHz FM - POCSAG paging - UK hospital pagers 
31.8000 MHz FM - Asian fishery radio chatter
31.8250 MHz FM - Digital two-way comms, possibly encrypted military 
31.9000 MHz FM - Asian fishery radio chatter
31.9750 MHz FM - French EPAR multi-tone traffic signal control data bursts
32.1750 MHz FM - Asian fishery radio chatter
32.2250 MHz FM - Asian fishery radio chatter
32.3000 MHz FM - Digital two-way comms, possibly encrypted military
32.7500 MHz FM - Military comms UNID source - tell-tale wide FM deviation
33.0000 MHz FM - FSK data bursts, deep fading
33.1000 MHz FM - Weak FM comms, possibly fishing fleets or US based land mobile radio
33.2000 MHz FM - Weak FM signals, two-way comms LMR type (unable to ID language)
33.4500 MHz FM - Digital two-way comms, possibly encrypted military
33.6250 MHz FM - Asian fishery radio chatter
33.8000 MHz FM - Asian fishery radio chatter
33.9000 MHz FM - Asian fishery radio chatter
34.1500 MHz FM - FM carrier - military wideband FM (unmodulated, 150Hz tone hum noted)
34.7000 MHz FM - Paging - weak POCSAG signals
34.9625 MHz FM - French PMR
35.0000 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.0750 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.1125 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.1250 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.1625 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.2000 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.2500 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.2375 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.2625 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.2750 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.3000 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.3125 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.3375 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.3750 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.4000 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.4250 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.4375 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.4500 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.4875 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.5000 MHz FM - POCSAG paging signals pager 35.5 MHz
35.5000 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.5125 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.5375 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.5500 MHz FM - POCSAG paging signals pager 35.55 MHz
35.5625 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.6000 MHz FM - POCSAG paging signals pager 35.6 MHz
35.6000 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.6375 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.6500 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.6625 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.7000 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.7750 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.7875 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.8000 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.8125 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.8500 MHz FM - Data signals mixing with the French LMR traffic
35.8875 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.9000 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.9250 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.9625 MHz FM - French PMR (likely DDE ePMR analog trunking system)
35.9750 MHz FM - French PMR (likely DDE ePMR analog trunking system)
36.0000 MHz FM - French PMR (likely DDE ePMR analog trunking system)
36.0125 MHz FM - French PMR (likely DDE ePMR analog trunking system)
36.0250 MHz FM - French PMR (likely DDE ePMR analog trunking system)
36.0500 MHz FM - French PMR (likely DDE ePMR analog trunking system)
36.1000 MHz FM - French PMR (likely DDE ePMR analog trunking system)
36.1125 MHz FM - French PMR (likely DDE ePMR analog trunking system)
36.1375 MHz FM - French PMR (likely DDE ePMR analog trunking system)
36.1875 MHz FM - French PMR (likely DDE ePMR analog trunking system)
36.2500 MHz FM - Military comms UNID source - tell-tale wide FM deviation

111
10/11 meters / Re: FM in the USA
« on: June 16, 2023, 1540 UTC »
Channel 65 as in 27.655 MHz FM? 

Channel 20 "up one band" - so 27.205 MHz up one band [+450 kHz] = 27.655 MHz FM. 

Makes sense, given the US based activity heard on 27.605 MHz FM and 27.805 MHz FM.  It does sound like a local net on an out of band frequency.

The band has been open a lot lately, lots of interesting stuff on 11m.  Glad to hear more folks are using FM. 

112
VHF low band logs

G8JNJ RaspSDR

32.350 MHz FM - Military FM comms, wide FM deviation, unknown source unknown language
32.325 MHz FM - Russian language chatter, NFM (doesn't seem like military)
32.200 MHz FM - POCSAG paging - unknown source - paging POCSAG
32.025 MHz FM - Asian fishing fleet chatter - fishery radio comms fishing veseels 32.0250 MHz FM
31.975 MHz FM - French EPAR traffic signal control multi-tone data bursts
31.800 MHz FM - Asian fishing fleet chatter - fishery radio comms fishing vessels 31.8000 MHz FM
31.775 MHz FM - POCSAG paging UK hospital pager
31.750 MHz FM - POCSAG paging UK hospital pager
31.725 MHz FM - POCSAG paging UK hospital pager
31.650 MHz FM - Military FM comms, wide FM deviation, unknown source unknown language
31.525 MHz FM - Asian fishing fleet chatter - fishery radio comms fishing vessels 31.5250 MHz FM
31.500 MHz FM - Asian fishing fleet chatter - fishery radio comms fishing vessels 31.5000 MHz FM
31.475 MHz FM - Military FM comms, wide FM deviation, possibly IDF
31.325 MHz FM - French EPAR traffic signal control multi-tone data bursts
31.320 MHz FM - POCSAG paging pager signals
31.200 MHz FM - Asian fishing fleet chatter - fishery radio comms fishing vessels 31.2000 MHz FM
31.100 MHz FM - Asian fishing fleet chatter - fishery radio comms fishing vessels 31.1000 MHz FM
31.025 MHz FM - Asian fishing fleet chatter - fishery radio comms fishing vessels 31.0250 MHz FM
30.800 MHz FM - Asian fishing fleet chatter - fishery radio comms fishing vessels 30.8000 MHz FM
30.785 MHz FM - FM carrier on/off, data with FM signal (no voice heard).  Not 30.7875 MHz
30.750 MHz FM - Asian fishing fleet chatter - fishery radio comms fishing vessels 30.7500 MHz FM
30.425 MHz FM - Short-duration paging bursts
30.325 MHz FM - Asian fishing fleet chatter - fishery radio comms fishing vessels 30.3250 MHz FM
30.155 MHz FM - FSK data bursts
30.100 MHz FM - POCSAG paging bursts
30.075 MHz FM - Military FM comms, wide FM deviation, unknown source unknown language
30.025 MHz FM - Asian fishing fleet chatter - fishery radio comms fishing vessels 30.0250 MHz FM 
30.000 MHz FM - FM carrier
29.975 MHz FM - Asian fishing fleet chatter - fishery radio comms fishing vessels 29.9750 MHz FM
29.900 MHz FM - POCSAG paging signals, bursts
29.900 MHz FM - FM carrier
29.875 MHz FM - Asian fishing fleet chatter - fishery radio comms fishing vessels 29.8750 MHz FM
29.850 MHz FM-CW - Over the horizon radar, 70-75 kHz wide
29.703 MHz USB - FSK signal (center frequency: 29.705 MHz)
29.700 MHz FM - Multi frequency shift keying data signal - bursts

113
10/11 meters / Re: FM in the USA
« on: June 12, 2023, 1227 UTC »
As others have mentioned, 26.805 MHz FM seems to be the "home channel". 

I've noticed US FM activity on 27.605 MHz FM and 27.805 MHz FM...but 26.805 FM is by far the most popular out of band frequency for US stations.

Of course, 27.605 MHz is right next to UK FM CB channel 1 on 27.60125 MHz FM.  27.805 MHz is right next to 27.80125 MHz (UK FM CB channel 21).  As far as the UK FM channels go, I've worked UK stations on 27.97125 FM (UK FM CB channel 38), 27.90125 MHz FM (UK FM CB channel 31) and 27.91125 MHz FM (UK FM CB channel 32).  Naturally UK FM channel 19 is the place to start - 27.78125 MHz FM or just 27.781 MHz FM. 

When the band is nice and open to the UK and Europe, there's lots of SSB QRM all over the band, plus AM and FM signals on the "standard" frequencies like 27.785 MHz [taxi cab dispatcher out of Mexico].   I've noticed that the Latin American stations are happy with using FM in the legal 40 CB band. 
 

As far as in-band legal 40 channels go, I've heard US FM signals on

Channel 14 - 27.125 MHz FM.  Unfortunately, there's a lot of AM users on that frequency. 
Channel 23 - 27.255 MHz FM
Channel 27 - 27.275 MHz FM
and
Channel 29 - 27.295 MHz FM. 

There are some indications that Channel 29 FM is being used in some parts of the country as a secondary channel to Channel 19 AM. 

Channels 30 and 31 are both popular FM calling channels in Europe. 


114
10/11 meters / 11m Activity UK Receiver 09 June 2023
« on: June 09, 2023, 1547 UTC »
Via G8JNJ remote SDR receiver. 

From 1120 UTC to 1135 UTC  on June 9th 2023.


25615 FM - Somebody doing radio checks or tuning up?
25615 LSB - Portuguese
25625 AM - Russian language chatter
25635 LSB - Portuguese, very busy
25662 USB - FSK signal
25665 AM - Italian, heavy fading
25690 USB - Strong FSK signal
25705 AM - Weak AM two-way comms
25715 AM - Italian language, two OMs - does *not* sound like a taxi cab
25770 FM - Russian LMR - taxi cab Russia YL dispatch
25775 LSB - Portuguese chatter, good signals w/Roger beep
25775 USB - Russian?
25785 AM - Italian
25800 AM - Weak AM signal - possibly 11m shortwave pirate
25805 AM - Italian, two OMs chatting, one is 2.5 kHz off-frequency
25815 AM - Weak AM chatter
25835 LSB - Portuguese
25855 FM - UNID language, weak
25875 FM - Russian LMR - taxi cab dispatcher YL
25895 AM - Portuguese, weak
25905 FM - Russian LMR - taxi cab radio dispatcher
25915 FM - Weak FM two-way comms
25925 FM - Weak FM two-way comms
25945 AM - Polish language?  UNID
25955 AM - Italian
25975 AM - Spanish language, possibly taxi cab dispatch LMR
25985 LSB - Portuguese, very good signals
26005 FM - Russian LMR - taxi cab Russia YL dispatch
26025 FM - Russian LMR - taxi cab Russia YL dispatch
26065 AM - Weak AM signals noted
26085 FM - Russian LMR - taxi cab Russia YL dispatch
26085 LSB - Spanish, somebody doing radio checks
26125 FM - Russian LMR - taxi cab Russia YL dispatch
26150 FM - POCSAG paging signals - 26.25 MHz pager
26155 AM - Spanish language, taxi cab dispatch?
26163 USB - FSK signal
26165 AM - Portuguese
26200 FM - POCSAG paging signals, often with FM carrier during "idle" times (26.2 MHz)
26205 FM - Russian LMR - taxi cab Russia YL dispatch Russian taxis
26225 USB - UNID language
26235 FM - Russian LMR - taxi cab Russia YL dispatch Russian taxis
26250 FM - POCSAG paging signals - 26.25 MHz pager
26285 AM - Italian language chatter
26300 FM - POCSAG paging signals - 26.3 MHz pager
26315 FM - Russian LMR - taxi cab Russia YL dispatch
26345 AM - Spanish language, informal chatter (freebanders)
26350 FM - POCSAG paging signals - 26.35 MHz pager
26385 AM - Portuguese, freebanders
26400 FM - POCSAG paging signals
26400 AM - AM signal with multi-tone data (not POCSAG!)
26415 AM - Portuguese chatter, freebanders
26425 AM - Portuguese language chatter, very active
26445 AM - Italian language chatter
26465 AM - Italian language chatter
26465 FM - Russian LMR - taxi cab Russia YL dispatch
26475 AM - Data bursts
26484 USB - FSK signal, very strong
26495 FM - Weak FM two-way chatter
26500 FM - POCSAG paging signals - 26.5 MHz pager
26505 AM - Portuguese language chatter
26515 FM - Russian LMR - Russian taxis 26MHz
26525 AM - Spanish language chatter, informal comms with Roger beeps
26530 FM - 8-10 kHz wide data signal
26531 USB - FSK signals
26540 LSB - Spanish language
26541 USB - FSK signals
26545 AM - AM voice signals, getting obliterated by FSK/data
26555 LSB - Spanish language, very busy
26560 FM - Russian LMR - Russian taxi cabs
26565 AM - Italian language
26565 FM - German language - weak
26585 AM - Spanish language
26588 USB - FSK signals
26600 FM - POCSAG paging signals 26.6 MHz pager
26605 LSB - Weak voice, getting obliterated by POCSAG paging signals
26630 FM - POCSAG paging signals 26.63 MHz pager
26635 FM - Strong FM carrier
26645 FM - POCSAG paging signals pager
26650 FM - POCSAG paging signals pager
26655 FM - Data signal, not POCSAG, very strong
26655 FM - POCSAG paging signals pager
26666 USB - FSK signals
26675 LSB - Italian language chatter
26682 USB - FSK signals
26685 AM - UNID language, Portuguse? Weak
26687 USB - FSK signal
26695 FM - POCSAG paging signals - several signals mixing together, very strong
26700 FM - POCSAG paging signals
26705 FM - POCSAG paging signals
26715 AM - Spanish language chatter
26723 USB - FSK signals
26725 FM - Russian LMR - Russian taxi cabs
26725 USB - FSK signals
26735 FM - German language
26740 LSB - French language chatter
26745 FM - POCSAG paging signals, nonstop POCSAG
26750 FM - POCSAG paging signals
26755 FM - POCSAG paging signals
26760 LSB - Portuguese chatter
26772 USB - FSK signals
26775 FM - Weak FM two-way comms, UNID
26775 USB - FSK signals
26790 USB - FSK signals
26802 USB - FSK signals
26815 FM - French, very strong signals, 9-10 kHz bandwidth
26820 FM - Russian LMR - taxi cab Russia YL dispatch
26825 FM - Weak FM signals
26835 FM - Portuguese
26840 USB - FSK signals
26853 USB - FSK signals
26875 FM - Noted FM signal activity, UNID user
26885 AM - Italian language chatter, mixing with FM
26885 FM - Weak FM signals noted
26895 FM - German language chatter
26900 FM - POCSAG paging signals
26904 USB - FSK signal - nonstop
26915 AM - Italian language
26925 FM - FSK data bursts
26935 AM - Portuguese language, strong
26945 FM - FSK bursts
26947 USB - FSK signals
26950 FM - Paging signals
26950 FM - Data bursts
26955 FM - FSK data bursts, MFSK
26960 FM - Data bursts, basically nonstop
26965 FM - Lots of signals on top of each other
26975 FM - Lots of signals on top of each other
26990 USB - French language chatter, data QRM
26995 FM - FSK bursts
27003 FM - POCSAG paging
27007 FM - POCSAG paging
27035 FM - Portuguese
27035 AM - Spanish language
27055 AM - UNID language
27065 AM - Spanish language, very busy
27075 FM - German language
27085 AM - AM calling frequency
27100 USB - UNID language, Eastern Europe
27125 AM - UK stations working AM mode, heavy FM QRM
27125 FM - German chatter
27130 AM - Polish?
27135 AM - Heavy QRM
27155 LSB - SSB calling frequency
27185 FM - Lots of signals
27190 USB - Spanish language
27195 FM - Data signals, weak
27200 FM - POCSAG paging
27200 LSB - Portuguese
27205 FM - Very busy
27235 FM - Packet AX.25 signals
27245 FM - Packet AX.25 signals 
27250 FM - Russian language?
27255 FM - Packet AX.25 signals
27255 USB - FT8 data signals
27255 AM - Modulated CW signals (AM mode with carrier)
27275 USB - UNID language, multiple signals on top of each other
27290 USB - Italian
27295 FM - UK CB stations heard
27300 FM - POCSAG paging signals
27305 USB - Numerous signals mixing together
27305 FM - Heard several stations on top of each other
27315 FM - Similar to 27.305 MHz FM
27350 FM - POCSAG paging signals
27355 FM - Spanish language, very good signals
27360 FM - POCSAG paging signals
27375 FM - Italian, almost full quieting, with faint SSB QRM
27380 LSB - SSB chatter
27385 LSB - SSB calling frequency
27405 FM - Station talking about FM mode vs. SSB on channel 40 (UK station)
27415 FM - UNID two-way comms, possibly LMR
27425 AM - Italian
27435 LSB - Spanish language
27450 FM - FM carrier, with paging signals
27455 USB - Spanish, very bad QRM from 27.465 MHz AM
27465 AM - Italian - very strong signals
27480 USB - Portuguese chatter
27485 AM - UNID user, way too much QRM from nearby SSB
27490 USB - "wish you the best, 14FTxxx and 13 division station QSO
27500 FM - Carrier, keyed down for 5-6 seconds, then unkeyed, then another 2-3 seconds
27505 AM - Italian - also very strong
27505 FM - POCSAG paging signals - very strong - 12 kHz wide
27510 USB - "Alpha Delta" "Japan" heard (in English)
27525 FM - UNID language, FM two-way comms
27537 USB - Faint SSB voice signals on frequency
27550 FM - POCSAG paging signals
27551 USB - FSK signals, FSK bursts
27555 USB - International calling frequency
27580 FM - POCSAG paging signals
27585 FM - UNID FM two-way comms
27590 FM - Russian LMR - taxi cab Russia YL dispatch
27600 FM - On/off carrier (right on 27.600 MHz)
27601 FM - UK FM CB chatter - 27.60125 MHz FM UK FM CB Channel 1
27620 USB - French language
27635 FM - ROS data mode
27640 USB - Portuguese
27641 FM - UK FM CB channel - 27.64125 MHz FM UK FM CB Channel 5
27645 USB - Italian chatter
27650 FM - POCSAG paging signals
27651 FM - UK FM CB chatter - 27.65125 MHz FM UK FM CB Channel 6
27655 FM - Russian LMR - Russian taxi cabs
27671 FM - UK FM CB chatter - 27.67125 MHz FM UK FM CB Channel 8
27681 FM - UK FM CB chatter - 27.68125 MHz FM UK FM CB Channel 9
27700 USB - SSTV
27700 FM - POCSAG paging signals pager 27.7 MHz
27720 USB - Italian language comms, heavy fading
27735 USB - German language comms
27750 FM - POCSAG paging signals pager 27.75 MHz
27750 FM - Asian fishing fleet radio network radio chatter 27.825 MHz FM [CSQ]
27765 FM - German language chatter
27775 FM - Possibly Russian taxi cab or Russian CB chatter
27781 FM - UK FM CB chatter - 27.78125 MHz FM UK FM CB Channel 19
27791 FM - UK FM CB chatter - 27.79125 MHz FM UK FM CB Channel 20
27805 FM - Russian LMR - Russian taxi cabs
27825 FM - Asian fishing fleet radio network radio chatter 27.825 MHz FM [CSQ]
27845 FM - POCSAG paging signals
27850 FM - POCSAG paging signals
27860 FM - Russian LMR - Russian taxi cabs 
27885 FM - POCSAG paging signals
27900 FM - Asian fishing fleet radio network radio chatter 27.900 MHz FM [CSQ]
27901 FM - UK FM CB chatter - 27.90125 MHz FM UK FM CB Channel 31
27911 FM - UK FM CB chatter - 27.91125 MHz FM UK FM CB Channel 32
27915 FM - Russian LMR - Russian taxi cabs
27920 FM - Russian LMR - Russian taxi cabs
27941 FM - UK FM CB chatter, weak. 27.94125 MHz FM UK FM Channel 35
27950 FM - POCSAG paging signals
27951 FM - UK FM CB chatter - 27.95125 MHz FM UK FM CB Channel 36
27961 FM - UK FM CB chatter - 27.96125 MHz FM UK FM CB Channel 37
27965 USB - French language, busy
27971 FM - UK FM CB chatter - 27.97125 MHz FM UK FM CB Channel 38
27975 FM - Asian fishing fleet radio network radio chatter 27.975 MHz FM [CSQ]
27981 FM - UK FM CB chatter - 27.98125 MHz FM UK FM CB Channel 39
27985 USB - French, heavy FM QRM
27985 FM - Russian taxi cab dispatch - Russian land mobile radio LMR
27991 FM - UK FM CB chatter - 27.99125 MHz FM UK FM CB Channel 40
27997 USB - French language
28215 FM - Russian LMR - taxi cab Russia YL dispatch
28265 FM - Russian LMR - taxi cab Russia YL dispatch 25

115
Heard via the G8JNJ RaspSDR UK based online receiver.  Band opening up, 11m and 10m along with VHF low band starting to open. 

The usual chatter on 29.875 MHz - Asian fishermen comms fishing fleet radio network 29875 FM 29.8750 FM [CSQ] 29,875kHz FM 29.875MHz FM CSQ simplex FM no tone.  Good quality audio at around 1130 UTC. 

These guys are running the de facto standard "FM Fishery Radiotelephone" system - 480 channel, channelized high-HF/low-VHF 25 watt radios. 

27.500 MHz to 39.475 MHz.  Some list the coverage as 27.5 MHz - 39.5 MHz or 27.500 MHz to 39.500 MHz.  The standard version uses 25 kHz channel steps, with straight numbering sequence. 

27.500 MHz FM - Channel 1
27.525 MHz FM - Channel 2
27.550 MHz FM - Channel 3
27.575 MHz FM - Channel 4 and so on


29.875 MHz FM is Channel 100 on that channel plan.  I've noted activity on 27.750 MHz FM, 27.775 MHz FM, 27.900 MHz FM, 27.975 MHz FM, 28.000 MHz FM, 29.150 MHz FM, 29.700 MHz FM, 29.725 MHz FM, 29.750 MHz FM, 29.775 MHz FM, 29.825 MHz FM and many many others (including even more above 30 MHz). 

The radios do cover the entire 28 MHz - 29.7 MHz 10m amateur band, and they've been monitored in-band, but usually they seem to stay between 27.500 MHz and 28.000 MHz and 29.700 MHz and 39.475 MHz.

There are apparently some "export" versions of these rigs that reduce the channel spacing from 25 kHz to 12.5 kHz (and reduce the FM deviation from 4 kHz/5 kHz to 2.5 kHz), producing double the available channels.  The indications are that most users are running the 25 kHz channel band plan.  However, frequencies 29.8875 MHz FM, 29.9625 MHz FM, 30.3625 MHz FM, 32.1125 MHz FM, 32.1625 MHz FM, 32.1875 MHz FM and several others have had Asian fishing fleet traffic monitored on them.

With the band open almost every day now...I expect more of these systems will start appearing.   Japan still has their two DSB fishing fleet radio telephone systems (in other words, AM mode).  Double sideband fishery radiotelephone service.  There's the

1W DSB 27MHz service AM voice and data
(26760 kHz to 27988 kHz or 26.760 MHz to 27.988 MHz, odd steps)

5W DSB 40MHz service AM voice and data
39.008 MHz to 39.928 MHz transmit/receive, 8 kHz channel spacing
35.544 MHz to 35.928 MHz ship receive only 8 kHz channel spacing (shore transmit)

The reason for the 35 MHz - 36 MHz shore transmit frequencies is, I believe, for half-duplex or even full duplex ship-to-shore comms.  Various Japanese fishing companies fisheries have licenses for the 35-36 MHz frequencies and the 39-40 MHz frequencies - indicating that the 39MHz band is used for ship-to-ship and ship-to-shore comms. 

Japan also has a 25W SSB 27MHz fishery radio service 27.3105 MHz to 27.4705 MHz or 27310.5 kHz to 27470.5 kHz, odd spacing, USB mode.

South Korea has a fisheries radio service at 27 MHz as well: 27.508 MHz to 27.943 MHz.  Like the Japanese 1 watt DSB AM 27 MHz fishery radio service, the channel spacing is very random. 

Add to that the fact that numerous other Asia - Pacific countries with large fishing fleets have what they simply call "marine CB" or "boat CB radio".  Usually that means one of the following:

26.065 MHz to 28.755 MHz - AM, FM, USB and LSB modes
25.550 MHz to 30.500 MHz - AM, FM, USB and LSB modes
26.475 MHz to 27.275 MHz - AM mode (other variants include 25.550 MHz to 27.270 MHz, also AM mode)
25.615 MHz to 30.105 MHz - AM, FM, USB and LSB modes

The 26.065 MHz to 28.755 MHz and 25.615 MHz to 30.105 MHz versions are the most popular.  All of them appear to use 10 kHz spacing, just like regular old export CB radio.


116
1540 UTC first noted.  Strong to fair signal strength, 13-14 kHz wide at full deviation.  Via G8JNJ RaspSDR internet SDR receiver.  Frequency 29.875 MHz FM.  29.875MHz FM.  Possibly Japanese language.  Fishing fleets.  Asian fishery radio 29.875MHz. 

Also noting strong POCSAG paging signals on 29.8 MHz and 29.9 MHz. 

117
Listening via online SDR - G8JNJ RaspSDR.  1500 UTC

Noted polytone data bursts (on several of the frequencies, also there was POCSAG signals!) on the following frequencies:

31.325 MHz
31.3875 MHz
31.4375 MHz
31.475 MHz - POCSAG paging signals noted on this frequency as well
31.6875 MHz
31.900 MHz
31.925 MHz
31.975 MHz

118
Fishery radio networks, 27.500 MHz FM to 39.475 MHz FM - 25 kHz spacing.  Channelized, carrier squelch, simplex FM. 

31.125 MHz FM 31.1250 FM [CSQ] 31.125MHz FM active with Asian fishermen chatting at 1200 UTC 25-May-2023.  Via UK based RaspSDR G8JNJ SDR frequency 31.125 MHz mode NFM.  Fishery radio chatter 25w output.  31.1250 MHz FM CSQ is one of the more popular frequencies.

119
Via UK based SDR.

27975 kHz FM 27.9750 FM [CSQ] 27.975MHz FM 27.975 MHz FM Asian fishermen radio chatter 1130 UTC May 25 2023. 
Fishing trawler radio chatter 27.750 MHz 27.75MHz 27.975MHz 27,975 27,750.  27.500 MHz FM 39.500 MHz FM.  Channel 20 frequency 27.9750 FM

SIO 222 to SIO 333, some dramatic fading.  Asian fishing radio fleet radio network 27.500 MHz - 39.475 MHz FM.  Often listed as 27.5MHz - 39.5MHz or 27.500 MHz - 39.500 MHz.  25 kHz spacing.  Fully channelized.  25 watt transmit power, 16K0F3E / 16K0G3E voice emission, 300 baud or 1200 baud AFSK / MFSK data transmission - 16K0F1D 16K0G1D emissions 16K0F2D / 16K0G2D GPS location ship to ship individual vessel call.  Channel 1 is 27.500MHz, channel 2 is 27.525MHz, channel 3 is 27.550MHz, channel 4 is 27.575MHz, channel 6 is 27.600MHz and so on. 

System is carrier squelch only, single frequency simplex.  No PL/DPL (CTCSS/DCS) tone squelch in use.  Just regular old simplex FM with carrier squelch, although the data based selective calling is apparently heavily used for individual vessel call and receiver muting (similar to the HF SSB SELCAL system, apparently). 

Lots of activity in the 29 MHz band, 30 MHz band, 31 MHz band...but now they're also showing up in 27 MHz.  Logged similar activity on 27.750 MHz FM (with pager POCSAG QRM, UK FM CB radio QRM 27.75125 MHz FM and SSB freeband CBer QRM).  Russian taxi dispatcher land mobile radio QRM.  Minor UK FM CB QRM from 27.97125 MHz FM as well. 

120
Tuning around 11m band 27 MHz band this morning, noted strong POCSAG paging signals on 27.845 MHz 27845 kHz, nearly nonstop. 

I checked 26.945 MHz, 26.960 MHz and others and they're quiet. 

Now there's an off-frequency POCSAG signal centered on 27.847 MHz or 27.8475 MHz or 27.848 MHz.  Tunes fine on 27.850 MHz.  Noted POCSAG activity on 27.855 MHz as well.  Seems like 27850 kHz 27.85 MHz is the "center" frequency. 

Heard at approx. 1125 UTC on May 25 2023 via G8JNJ SDR in Wessex, UK.


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