Signal Identification Guide

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This wiki is intended to help identify radio signals through example sounds and waterfall images. Most signals are received and recorded using a software defined radio such as the RTL-SDR, Airspy, SDRPlay, HackRF, BladeRF, Funcube Dongle, USRP or others.

Editing: Anyone can edit this wiki, so if you see missing or wrong information please feel free to correct it by clicking the 'edit with form' button at the stop of the signals page. When doing an edit, if you are not logged in as a user, you will be asked to answer a very simple spam prevention question which will appear at the top of the screen after clicking on Save page. If you are not experienced with editing Wiki Markup, refer to this reference card, Quick Guide of editing pages, or just email the requested changes at sigidwiki_AT_gmail_DOT_com.

Discussion: You can also discuss the signals by using the discussion tab at the top of every page, or just by using the comments box at the bottom of this page (note that the comments section will be periodically pruned to reduce its length).

Addsignal.png


Software
Artemis 2.png

Artemis 2

Check out Artemis 2, the main companion app to this guide! Artemis 2 gives you all known reference signals in an easy to access offline format, with improved sorting and filters and offline audio samples and waterfalls.



Frequency bands.png

VLF.png

1
LF.png

19
MF.png

26
HF.png

183
VHF.png

84
UHF.png

92

Testing.png

AllSignals.png Unid.png
Military.png Radar.png Active.png Inactive.png Amateur.png Commercial.png
Aviation.png Marine.png Analogue.png Digital.png Trunked.png Utility.png
Satellite.png Navigation.png Interfering.png Requested.png Numbers.png Time.png
== Stats ==

Stats


Identified Signals in Database: 312
Unidentified Signals to be Identified: 145
Requested Signals: 54


Recently Added Signals Recently Updated Signals

Recently Added Unidentified Signals Recently Updated Unidentified Signals


Comments

Feel free to make comments about unidentified signals that you might know or anything else here.


Anonymous user #1

877 days ago
Score 1+-

I'd like to put in a request for info and signal sample on RD-LAP and also on the Motorola MDTMobile Data Terminal, A mobile data terminal (MDT) is a computerized device used in public transit vehicles, taxicabs, commercial trucking fleets, military logistics, and emergency vehicles, such as police cars, to communicate with a central dispatch office. signals that preceded the 19.2 kbpsKilobits per second (kbps) rdlap, such as MDC4800.

This is sold by Motorola as part of their DataTAC network package. It used to be active as part of the ARDIS network nationwide, but I believe that has all been retired (maybe still used somewhere? Not 100% sure)

Also, it is still used by some police departments and others with private datatac networks.

Anonymous user #2

779 days ago
Score -1+-

I found this web page full of digital signals: http://kb9ukd.com/digital

Listening to theese signals I think that Unknown Chirping 2 could be mmp-4800 but there are also other similar modes like SEAR, SCADA.

Anonymous user #2

687 days ago
Score 0+-

In response to the person who posted about the "Police Idling Walkie Talkie Radio Signal"

I have also found the same signal in the UK which is on the 70cm band it pulses every few seconds with 12MHz BW, I also noticed there is an other pulse signal 30 mhz apart which pulses at a slower pace once every 4 or 5 pulses.

Anonymous user #3

680 days ago
Score 0+-
1.8126MHZ; a female voice reading out a string of numbers in what sounds like Italian language. Heard for one hour 2100hrs GMT. This is in the Ham Radio top-band frequency range.

Anonymous user #4

342 days ago
Score 1+-

"1.8126MHZ; a female voice reading out a string of numbers in what sounds like Italian language. Heard for one hour 2100hrs GMT. This is in the Ham Radio top-band frequency range."

There's also the english version if you wait enough

METEOMAR VHFVery High Frequency (30-300 MHz) 156.425 MHzMegaHertz (MHz) 10^6 Hz by Telecom Italia

Anonymous user #5

243 days ago
Score 0+-
probably maritime or aviation weather forecast

Anonymous user #3

666 days ago
Score 1+-

All the missing sound samples here: https://mega...GuGFwpEcxfaA

Please let me know if you need more.

Erbo

639 days ago
Score 0+-

Very nice wiki! very helpful! Unknown 40 is very weird.

I'm located in Quebec, Canada near Montreal, lots of signal around, some unknown.

MikeAgner

632 days ago
Score 0+-

Hi - I just joined, and noted a few things that are incorrect;

a. Serdolink is misspelled - it should be Serdolik

b. There seems to be quite a bit of confusion on the Cuban HM01 listing. DIGTRX is not a mode - it's an app originally written for digital TV, and folks try to use it to read the data sent by this station (only not very well, from what I hear). The mode is an adaptation of a ham mode known as Redundant Data File Transfer or RDFT. You can find listings for this at the well known Numbers and Oddities website, listed as 'AMAmplitude Modulation/RDFT' as the mode

In the next few days I will be adding a lot of software links. Stay tuned...

MikeAgner

631 days ago
Score 0+-

I'll add that to my list :.>>

Actually I found something on RDFT that might be of interest, and even a link for DIGTRX

http://swlin...nd-explains/

http://digtr...nformer.com/

I have a little more, but I'll save that for when I work on that article...CUL Mike

MikeAgner

625 days ago
Score 0+-

You can also find a nice summation of many of the amateur digital modes, and at least 1 web page for each, here....

http://wiki....mateur_Radio

Anonymous user #6

608 days ago
Score 1+-

The last signal "weird moving signal" I know EXACTLY what that is, it is an OLD type of telemetry signal used to remotly send the value displayed on a gauge or dial, It works by taking the circular movement of a needle on a dial (like a thermometer or pressure gauge) and connecting the shaft to a potentiometer and using the pot to control a VCO, you get the data by knowing the "center" frequency and calculating the offset value of the Continuous signal as it moves up and down, the ammount it moves is displayed at the RXReceive end by taking the difference in frequency and using that value to move a dial on a gauge.

This tech dates WAYYY back, back to the 1930's

Cartoonman

598 days ago
Score 1+-
I will look into this as soon as I get a chance, thanks!

Admin

598 days ago
Score 0+-
I thought that it was probably just be some sort of internal noise from the RTL-SDR, but this might be right too.

Anonymous user #7

544 days ago
Score 1+-
Maybe someone could add Autex from MultiPSK.

Anonymous user #8

444 days ago
Score 0+-

Anon #7 is ABSOLUTELY right about that "weird moving signal" one, it is used for what s/he said, and more, it used to be used also for seismographic sensor data collection, as follows:

Lay out a LARGE array of sensors, each with one of these analog telemetry TXTransmit units, each on a different freq. and you RXReceive it in USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) mode, like s/he said to get the data back you have to know the centre freq. and amount the offset of the signals are the data.

I was VERY shocked to see that these are STILL being used, I say that because back then the bands were almost devoid of activity, save for A1A ship to shore comms. When more and more users began to use the radio spectrum these devices were banned because they cause TERRIBLE interference!!! they roam around a centre freq. and can deviate by as much as 100 kcs up or down!

Cartoonman

443 days ago
Score 0+-
Interesting... This will be the next signal I look into. Do you know any specific names or devices of these kind of signals to ease my research?

MillMan

419 days ago
Score 0+-

CartoonMan :

Let say , it is static position. how do we figure out ?

Cartoonman

419 days ago
Score 0+-
hmm, if its a geostationary satellite, i guess you'll have to figure out the frequency for your specific part of the earth and the satellite that corresponds to that frequency. Geostationary satellites follow the earth's rotation so they stay in the same relative area of the earth, and if this is true i dont think the frequencies would be allowed to mix with other satellites in that region at least.

MillMan

407 days ago
Score 0+-

2 things :

1. Let say i know the signal comes from satellite , how do we confirm the signal comes from that particular satellite 2. I received strange waterfall pattern. http://imgur.com/SVoihWF

any comment !

Cartoonman

407 days ago
Score 0+-

the 2.4GHz range has a bunch of oddities, and i think i've seen what you got, but may not be from same transmission: http://imgur.com/AmluTy4

If you can figure out the satellite's modulation and specific frequency to be the same frequency you receive, and you do some independant tests where you try to receive indoors vs outdoors, then you can say with some evidence that your signal comes from that particular satellite. May I ask what satellite you're looking at?

Anonymous user #9

67 days ago
Score 0+-
Looks like a microwave oven..

MillMan

399 days ago
Score 0+-
hi there, I did at http://www.s...l_at_2.4_GHz

Cartoonman

399 days ago
Score 0+-

Is this the one you suspect to be a satellite? I *think* the 2.4GHz is ISM so many different devices operate on it (not to mention microwaves to say the least). Satellites would probably stay away from this range.

For your signal, is it possible to see how wide these bursts are? In the docx you provided i see a middle point where signal power is decreased, which would suggest that this is the center frequency of the transmission. The sidebands of it therefore must be to the left and right of the signal

MillMan

396 days ago
Score 0+-
I use AirMagnet Spectrum XT and I can see the same thing. The sound is totally different because it is not wifi sound. detected everywhere in the region. sometime it affected few channels ( 4-10 channels ).

Cartoonman

396 days ago
Score 0+-
hmm, have you been able to localize where it occurs? usually 2.4GHz stuff is near-proximity because of line of sight behavior of microwave band. It might be some sort of 2.4ghz telemetry that's really strong for some reason. It probably isn't a satellite, but then again i haven't had much experience with satellites.

Anonymous user #10

392 days ago
Score 0+-
well.. the radio sound always the same and never change and inside the flight as well.

Cartoonman

391 days ago
Score 0+-
hmm... could it possibly be noise? either from the receiver or computer?

Anonymous user #10

384 days ago
Score 0+-
no, i tried in different place where no electronics , i have same sound wit different power lovel at 2.4 GHzGigaHertz (GHz) 10^9 Hz

Cartoonman

384 days ago
Score 0+-

and you have received the same signal with a different receiver or sdr? i know some upconverters like mine emit some spurious emissions which get picked up and i was able to see them with another sdr so i could verify it was really there.

I believe 2.4GHz is ISM band so it could really be anything.

The6P4C

333 days ago
Score 0+-
I just updated my unknown signal, http://www.s...nown_504p690. I fixed the broken IQ file link, so if anyone'd like to have a look it's there. I'd be very interested if anyone can derive some meaning from it :)

Cartoonman

333 days ago
Score 1+-
I've added my analysis. You found quite a fascinating signal there. At first I thought it was just computer noise but when i analyzed it, there was too much perfection that it had to be on purpose and transmitting data.

Linkz

328 days ago
Score 1+-
oops i post on the wrong page, admin ack those informations & delete them please

Cartoonman

328 days ago
Score 0+-
Your ids have been acknowledged, thanks!

Anonymous user #11

327 days ago
Score 0+-
Señales interfirente potent en 7.120 con un ancho de banda de 15 kcc recibido en receptores SDR de España, Francia, Holanda, Suècia, Polònia, Chekia,Rusia y tambien en Australia 15.00UTC hasta 23.00 UTC Origen desconocido .

Cartoonman

327 days ago
Score 0+-

"Interfering signals in 7120 kHzKiloHertz (kHz) 10^3 Hz with a bandwidth of 15 kcc received in SDR from Spain , France, Holland , Sweden, Poland , Chekia , Russia receptors and also in Australia 15.00UTC until 23:00 UTC Unknown Origin"

lo siento si no comprendo claro.

http://puu.s...5d7b617e.jpg

I believe this is what you saw /\. I looked at WebSDR at University of Twente, and this was their log from ~6:30 UTC yesterday. If the signal was 15 kHzKiloHertz (kHz) 10^3 Hz wide, most likely 29B6 Russian Over the Horizon Radar.

MillMan

289 days ago
Score 0+-

Dear All, I detected unknown signal and I have captured using SDR# and HackRF. It is 16 Bit PCM Baseband ( IQ file , the file can be downloaded : https://mega.nz/#!wgohWRyQ

I need help to decode the signals.

MillMan

289 days ago
Score 0+-

here is the link to download he file :

https://mega...V0aML5wCr6uY

Cartoonman

280 days ago
Score 0+-
i've added an entry for this here: http://www.s...own_2.42_GHz

Anonymous user #12

252 days ago
Score 0+-
a

Cartoonman

252 days ago
Score 0+-
?

ANgazu

239 days ago
Score 0+-

Hi.

I would like to add some ACF data to signals, but not proper field so ARTEMIS can not display it.

Hope you can add that field.

Best regards.

Cartoonman

239 days ago
Score 0+-
Hi ANgazu, i've now added ACF support to signals. You can either add "|ACF=" to the signal's source code in edit, or use the edit form option and enter the ACF field for the signal.

ANgazu

237 days ago
Score 0+-

Thanks Cartoonman.

I will add some ACF to database. Hope it helps in Signal Identification.

Besta regards.

Aco

235 days ago
Score 0+-

Hi ANgazu, thanks for your work: I've planned to upload updated version of Artemis (with ACF filters, new DB and so on) this evening. Some suggestion about ACF data (to keep some formalism on International System of Unit (SI) and avoid equivocal definitions):

1) Abbreviation of second should be "s" (lowercase) and not "S" (uppercase, Siemens = electric conductance) 2) To keep consistency, all time intervals should be written in msmilliseconds (.001 of a second) (milliseconds). For instance, TETRA superframe: 1020 msmilliseconds (.001 of a second)

PS: Thanks again for your contribution!

Cheers,

Marco

ANgazu

235 days ago
Score 0+-

Thanks for the tip.

All times will be in msmilliseconds (.001 of a second).


Best regards.

Anonymous user #13

234 days ago
Score 0+-

This unidentified signal I have solved http://www.s...unked_System

447.135 its a NXDN48 signal. The "Kunsthalle" Vienna is this 447.350 its a NXDN96 signal, used bei the Vienna Schatzkammer

This radios are used

http://comms...p?category=1

Cartoonman

233 days ago
Score 0+-
Thanks for your identification! I will merge this with our existing NXDN page as soon as i can!

Cartoonman

232 days ago
Score 0+-

ANgazu, regarding your recent submission: http://www.s...0_Appendix_C

Is this MIL 188-110C App.D? Theres a lot of confusion between different versions since updated standards reuse the same letters but may change the appendix. This is because we have http://www.s.../STANAG_4539, which is also called MIL-STD-188-110B/C Appendix C.

ANgazu

232 days ago
Score 0+-

It is appendix C and you are OK, It is 4539, too, so please erase my submission. ACF is 119.6 mS for App C.

Best regards.

ANgazu.

MikeAgner

230 days ago
Score 0+-
Please make Multi Frequency Shift Keying (MFSKMultiple Frequency Shift-Keying) on the Amateur Radio category green. Along with Olivia, it's used almost every weekend during the VoA tests (2 other stations are also participating). See the link I added in those articles for more information if you're interested. Thanks

Cartoonman

230 days ago
Score 0+-
Thanks, I've updated the status of MFSKMultiple Frequency Shift-Keying. It should update by the next server database refresh.

MikeAgner

226 days ago
Score 0+-

You can additionally change these to green;

HFHigh Frequency (3-30 MHz) signals (verified by number of logs found in the UDXF Yahoo group) CCIR493-4 North Korean Diplo FSKFrequency-Shift Keying Packet (kinda rare on HFHigh Frequency (3-30 MHz), more on VHFVery High Frequency (30-300 MHz)) PACTOR1 and 2 Serdolik Siemens CHX-200 (last seen in 2015 - rarely reported)

VHFVery High Frequency (30-300 MHz) Systems Next Generation Digital Narrowband (NXDN)

Trunked Systems Enhanced Data Access Communications Systems (EDACS) Logic Trunked Radio (LTR) Motorola Type II

I'm unsure as to whether you're in the US or not, but those 3 trunking systems are quite active, and as you noted, EDACS is going EOL in about a year or so. NXDN is a slowly growing trunked app, being used in railroads (and a couple of private and statewide systems)., It's both a trunking and conventional app

I'll adjust the categories over the weekend. Please change these on the main page to green. Thanks

Cartoonman

225 days ago
Score 0+-
Thanks for the updates on these signals! When I see the changes updated, I'll refresh the pages for you so that they are displayed green.

Mbeam

207 days ago
Score 0+-
as of the time of this comment, number station HM01 is active on 9.065 mhz  !

Mbeam

207 days ago
Score 0+-
then boom just like that its gone :(

Mbeam

207 days ago
Score 0+-
Found it again on 9.240 !

Anonymous user #14

205 days ago
Score 0+-

I have recorded strange signal at 2,4 GHzGigaHertz (GHz) 10^9 Hz. Please make a note that the transmission is vertical line.

The signal can be downloaded at :

- Signal data set : https://mega...DcVB6nzdCGko

- https://mega...-WjpHbWaDwb0

Cartoonman

205 days ago
Score 0+-
If you have airspy, try using their new Spectrum Spy program which allows you to view a much wider bandwidth in real time. The problem with having a smaller bandpass than the signal bandwidth is you cannot really tell what the signal really is. The vertical line transmission could just be a harmonic from some other much more powerful continuous wave signal. Lots of signals occupy the 2.4 ISM band so it will be hard to figure out where it's exactly coming from.

Mbeam

203 days ago
Score 0+-
added WLO to the wiki

Mbeam

199 days ago
Score 1+-
USA military EAM on 8.992 was active just a short while ago , will post audio later

Cartoonman

199 days ago
Score 1+-
Added your audio recording to the HFGCS page.

Mbeam

198 days ago
Score 0+-
HM01 number station active again on 9.065

Anonymous user #15

179 days ago
Score 0+-

Please watch my video. I want to find the source of the signal And I would appreciate your help. Thank you.

https://youtu.be/oJbqRV514W4

Anonymous user #15

179 days ago
Score 0+-

https://youtu.be/Niksar3AEKg

Let me know what you think...

Cartoonman

176 days ago
Score 0+-
Radio frequencies don't interact with water in such a visible way. I'm afraid that what you have is just either heat or wind aberrations.

Mbeam

175 days ago
Score 1+-
check you pool filter for a transmitter , ( aka bugs )

QuantumQuetzal

175 days ago
Score 0+-

Hi! I recently made a request about a signal that is always transmitting in the 850 MHzMegaHertz (MHz) 10^6 Hz band,in my hometown Santa Tecla, El Salvador. Here's the link to the article.

http://www.s...850_mhz_band

What kind of digital mode that signal, my guess is something related to speech communications but I've never heard something similar.

Is it possible to decode it? Which decoder I should use? Because I've tried DSD+ and nothing picks up.

My rig is only a full vanilla RTL-SDR

Best regards!

Cartoonman

175 days ago
Score 1+-

Look into our entry on iDEN. I'm 100% certain this is what you're seeing.

http://www.s...twork_(iDEN)

QuantumQuetzal

175 days ago
Score 0+-

Thanks Cartoonman! Indeed it is iDEN.

It's possible to delete my entry? To avoid any duplicates of the same subject?

Cartoonman

174 days ago
Score 0+-
Don't worry, I'll merge your entry with the existing iDEN one. Our entries can always use more samples :)

Lsr

149 days ago
Score 0+-
Sometimes it can be helpful to lookup the devices that operate at a particular frequency: https://fcci...explorer.php

KarapuZ

140 days ago
Score 0+-
Signal "Unknown FSKFrequency-Shift Keying, possible STANAGNATO Standardization Agreement (STANAG), defines processes, procedures, terms, and conditions for common military or technical procedures or equipment between the member countries of the North Atlantic Treaty Organization (NATO). 4202" is a Finnish encrypted messaging system NOKIA ADAPTIVE M85200 M / 90 MSG TERMINAL. In the transmit mode at a speed of 150 baudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second., used is characteristic coding, which is described in the comments Cryptomaster this link: http://signa...e/signal135/

Cartoonman

140 days ago
Score 0+-
Thanks, the signal entry is now made!

QuantumQuetzal

127 days ago
Score 0+-
hi! recently i catched what i believe is a rtty transmission on 16.122 khz, here's a link of that https://driv...hdHVyYndIZzg the transmission ended at 20:00 UTC -4 (central america)

Cartoonman

126 days ago
Score 0+-
What you got is most likely http://www.s.../STANAG_4481 STANAGNATO Standardization Agreement (STANAG), defines processes, procedures, terms, and conditions for common military or technical procedures or equipment between the member countries of the North Atlantic Treaty Organization (NATO). 4481, which is commonly found in the shortwave bands these days with 850Hz spread. Military fsk transmission shore to ship I believe.

QuantumQuetzal

125 days ago
Score 0+-
Oh! I see. but catching a supposed stanag transmission on Salvadoran coast (which I'm close to) is super weird or the atmospheric conditions was in favor because I even caught Radio Habana in 15.140 khz. Even though there is a bad case of strong FMFrequency Modulation stations blasting 24/7 casing intermodulation on my sdr dongle

Cartoonman

125 days ago
Score 0+-
STANAGNATO Standardization Agreement (STANAG), defines processes, procedures, terms, and conditions for common military or technical procedures or equipment between the member countries of the North Atlantic Treaty Organization (NATO). is used by a lot of militaries, not only NATONorth Atlantic Treaty Organization. It's likely a US based one and yea, propagation conditions can make it so that you can hear it. Since it's just standard FSKFrequency-Shift Keying, you could try to decode using a generic RTTYRadio TeleTYpe decoder, but if it's encrypted you'll only get garbage, or if they're using a different encoding or charset.

QuantumQuetzal

125 days ago
Score 0+-
Oh I didn't knew that. And to decode that fsk, I used sorcerer but like you said I've decoded a lot gibberish. Any way thanks a lot!

AmatorRadioResearcher

123 days ago
Score 0+-

Guys, anyone has the experience of decoding ACARS system?

Does anyone have any information regarding the operations that must be applied after demodulation, to see the header that is claimed in the standard ?

Anonymous user #16

122 days ago
Score 0+-

I think the header is xor ed with something

you need to find that something :D

Anonymous user #17

120 days ago
Score 1+-

I have got the same problem

please share you knowledge if you found the answer

AmatorRadioResearcher

109 days ago
Score 0+-

Guys with Experience on ACARS system, Would you please share your experience to the operation that is needed to expose the header out of the demodulated bits ? The discussion page is here: "http://www.s...stem_(ACARS)"

With Special Regards,

AmatorRadioResearcher

109 days ago
Score 0+-
I have shared an experience for AIS decoding process

AmatorRadioResearcher

105 days ago
Score 0+-
I found the answer to ACARS

Cartoonman

105 days ago
Score 1+-
? The answer to the problem in the talk page? you can share it there or on the main page of ACARS.

Anonymous user #18

52 days ago
Score 0+-

Hello.

Having problems whith GM2100 waterfall and sound. Files are uploaded but no showed. Please, try to do it for me.

Thanks a lot.

ANgazu.

Anonymous user #19

25 days ago
Score 0+-
Can a RTL-SDR be used as a troubleshooting tools for Wi-Fi, Z-Wave, and ZigBee signaling problems in home automation systems. Has anyone developed software to accomplish this?

Anonymous user #20

25 days ago
Score 0+-
Of course! I use my SDR all the time to diagnose issues with my wireless weather sensors. Usually it just comes down to low battery power, but it can also be used to make sure that the signal is received strong enough by the receiver depending on the RFRadio Frequency environment.

Anonymous user #20

25 days ago
Score 0+-
With Wifi, rtl-sdr isn't really suitable due to the wide bandwidth of wifi compared to the relatively narrow passband of the rtl-sdr. Not sure about the other 2 but they sound like IoT systems, which i believe are in the frequency range of rtl-sdr and are narrow enough to do so.

Vittorio

21 days ago
Score 0+-
hy my friends i have a DVB-T DAB+FMFrequency Modulation+SDR. dongle i live in the west coast puerto rico,my question is when it sas tha Bandwith is:PSKPhase-Shift Keying,C4FMContinuous 4-Level Frequency Modulation OR 4FSK. what means dose letters after the 4 ???PSKPhase-Shift Keying ??? C4FMContinuous 4-Level Frequency Modulation???....IM INTEREST IN (P25)in my town how i can hear it with my dongle pleace help my friend i have the basic sdr# program for beiguiners

Cartoonman

21 days ago
Score 0+-

Hi Vittorio, when something says PSKPhase-Shift Keying, C4FMContinuous 4-Level Frequency Modulation, or 4FSK, these are modulations, not bandwidth. PSKPhase-Shift Keying = Phase Shift Keying, using phase of carrier to shift bits. C4FMContinuous 4-Level Frequency Modulation and 4FSK are unique modes to P25. They're simply how it sends digital data over analog RFRadio Frequency channel.

To listen to P25, you first have to find frequency of a P25 control channel or radio channel. They tend to be around 400-550 Mhz or 800-860 MHzMegaHertz (MHz) 10^6 Hz.

Tutorial for trunked radio: http://www.r...-unitrunker/

Anonymous user #21

15 days ago
Score 0+-

I recorded this is Bermuda back in 2013 on 460.100MHz can anyone ID?

http://forum...#post2164801

Cartoonman

13 days ago
Score 0+-
Not sure. It has some semblance to some data terminals possibly, for bus or taxi dispatch. Not sure though.
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