| |
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|
| Click on a digital mode below to hear a brief
(most <100 kilobytes) sample of the sound these modes make. Hopefully this
page will help you identify a mode you've heard (or help me identify ones
I've heard!). Many folks have submitted excellent quality, lengthy
files which are no trouble for me to accept, but I do generally drop the
sampling rate and length to make them more reasonable to download over a
dial-up line. The intent here is more for recognition by ear than for
signal analysis. I have higher quality
samples of some files, please email me to request them (up to 3MB). |
| Send me your .wav files of digital modes not
featured and I'll happily add it, paying credit where due. High sample rates
and large files are encouraged. Please
include frequency and user info to help ID your sample. Your comments or
clarifications are always welcome. Send mail to garyhahn@wi.rr.com. |
| Send mail to: |
garyhahn@wi.rr.com |
|
Back to the SEWI
home page! |
| |
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|
|
|
| Sound |
Acronym |
Description |
Common Freqs |
Links |
Special Thanks |
| CW 20 wpm |
Continuous Wave |
Continous
Wave is technically a modulation scheme, but the term CW is often used
interchangeably with Morse Code. This sample is keyed at 20 words per minute.
Many repeaters ID in Morse Code. |
|
More info |
|
| RTTY 45 baud |
Radio TeleTYpe |
Sends text as 5 bit
characters with no error correction. 45 baud is the Amateur standard. |
14075 KHz USB |
More info |
|
| RTTY 75 baud |
Radio TeleTYpe |
Same as above, except
faster. Commonly used in weather data transfer. |
10536 kHz USB |
|
|
| SITOR-A |
Simplex Telex Over Radio |
Sends data in a two
frequency mode, one for sending and one for receiving an acknowledge. The
brief pause you hear in this sample is where the receiving station sends the
acknowledge burst. Automatic Repeat
reQuest guarantees delivery. |
|
|
|
| AMTOR ARQ |
Amateur Teletype Over Radio |
As above. |
|
|
|
| SITOR-B |
Simplex Telex Over Radio |
In
this case using Forward Error Correction mode, minimizing errors. Identical
format used in SITOR - SImplex Teletype Over Radio, and NAVTEX - NAVigational
TEleX. |
14070, 6330, 518 kHz,
respectively |
|
|
| AMTOR FEC |
Amateur Teletype Over Radio |
As above. |
|
|
|
| ROU-FEC 164.5/218.3 bd |
Roumanian FEC |
See above for FEC
explanation. |
HF band |
|
Unknown |
| SWED-ARQ |
Swedish ARQ |
As above. |
HF band |
|
|
| PSK-31 |
Phase Shift Keyed |
Currently, a quite popular
amateur mode providing highly readable teletext over great distances on low
power on narrow bandwidth. |
HF band |
|
|
| MFSK |
Multi-Frequency Shift Keying |
Sequential multi-tone data
mode near 64bps. |
HF band |
More info |
Van Lanphear |
| VFT |
Voice Frequency Telegraphy |
An older USAF RTTY-like
data mode |
HF band |
|
|
| Hyperfix |
|
A military data or sounding
mode. |
HF band |
|
|
| Hyperfix |
|
As above. |
HF band |
|
|
| ALE |
Automatic Link Establishment |
Propagation sounding and
messaging used by the military. |
HF band |
More info |
|
| SSTV |
Slow Scan TeleVision |
Amateur video mode carries
images one scan line at a time by using a frequency shift for each pixel. |
14230 kHz USB |
More info |
Pic
from Mir on 145.985 |
| WeFax |
Weather Fax |
Used to send weather maps
and photos primarily to ships at sea and operates similarly to SSTV |
8080 kHz USB |
|
|
| Packet 300 baud |
|
Amateur Packet radio sends
data in bursts at 300 baud, and waits for an acknowledge packet from the
other end before sending the next packet. |
14105 kHz USB |
More info |
|
| Packet 1200 baud |
|
As above, but faster. |
144.39 NFM, 145.030 NFM |
|
|
| Bell 103 modem 300 baud |
|
Used by WB9AGH weather wire in a
Chicago suburb for transmission of weather info. Can be decoded with a telephone modem. |
147.060 NFM |
|
Scott, Jerry in IL |
| Pactor |
|
A sort of combination of
Packet and AMTOR used by ships and Amateur Radio on HF. |
HF band |
|
|
| 5/6 tone paging |
|
Used for simple tone or
voice pagers or ANI. This sample has 2
sequences reading 0-123456 when decoded, the first set use an optional
preamble. |
|
|
Steve Donnell |
| Golay |
Named after a mathematician |
Golay is a 600 baud paging
signal developed by Motorola. Also, Motorola DPL uses the same protocol
format as a subaudible tone set of a 23 bit repeated word sent at a 134.5 Hz
rate. |
|
|
Gary Gray |
| POCSAG 512 baud |
Post Office Code
Standarisation Advisory Group |
A paging format originating
in the UK, used widely in the US. |
152, 454, 929, and 931 MHz
US |
|
|
| POCSAG 1200 baud |
|
As above, only faster. |
|
|
|
| POCSAG 2400 baud |
|
As above, faster yet. |
|
|
|
| FLEX |
|
Another paging format
common in the US. 2 or 4 level
signalling as 1600, 3200, or 6400bd rates. |
929 and 931 MHz US |
More
info |
|
| ERMES |
European Radio MEssage
System |
6250 baud paging format
used in Europe |
169MHz in France, Hungary,
Malaysia |
More
info |
|
| AFSK Paging Link |
Audio Frequency Shift Keyed |
At the paging Tx site, this
AFSK is decoded into the "digital" FSK format (e.g, POCSAG). |
72-75 MHz US, also old
mobile phone freqs |
|
Steve D. |
| FLEX Paging Link? |
|
Pretty sure this is a
paging link from terminal to transmitter |
940MHz US |
|
EJ Caylor |
| Speedcall DTMF |
Dual Tone Multi Frequency |
Yep, just like telephone
dial, but quite rapid. This particular
use is for water utility telemetry.
Also used for other signalling and over the air device activation. |
About anywhere, as DTMF
falls in the passband of most transceivers |
|
anonymous in CA |
| MODAT |
|
Used as ANI or status
indicator, precedes or follows voice. |
|
|
Lindsay Blanton |
| GE-Star |
|
Used as ANI or status
indicator, precedes or follows voice. |
155.445 WI State Patrol D1 |
|
Lindsay Blanton, Jake Guild |
| MDC1200 |
|
Used as ANI or status
indicator, precedes or follows voice. |
154.130 Milw FD |
|
Jake Guild |
| MDC4800 |
|
Mobile Data Terminals
(MDTs) used in Police squads. |
858.2625, 855.7375 in
Milwaukee, WI |
|
|
| MDC4800 (ARDIS ) |
|
Slightly different in
sound, Ardis, now Motient, is a packet switched
data network for two-way data transfer. |
formerly 854.8375 in
Milwaukee |
|
|
| MDC4800 (ARDIS at 855.8375) |
|
Somewhat different yet in
sound. |
855.8375 in Milwaukee |
|
|
| MDC4800? |
|
SAPOL - South Australian Police |
868.7625
MHz |
|
Jon in Australia |
| RD-LAP 9600 baud |
Radio Data - Link Access
Protocol ? |
As used by a power utility
in Wisconsin. Not fully verified, note similarity to 19.2k variety. |
938.9375 in WI by WEPCo |
|
|
| RD-LAP 19200 baud |
Radio Data - Link Access
Protocol ? |
Mobile Data Terminals
(MDTs) used in Police squads. |
856.7375, 857.2625 in
Milwaukee, also ARDIS now 854.8375 |
|
|
| DataRadioIP |
|
Mobile Data Terminals
(MDTs) used in Police squads. Uses IP as addressing system and allows Voice
Over IP |
857.2625 Sheboygan Co, WI |
More info |
Mike Mannchen |
| MMP-4800 (MDI) |
|
Mobile Data Terminals
(MDTs) used in Police squads and FedEx. Created by a company called Mobile
Data International, which was purchased by Motorola. |
|
|
Charles Guerin, Eric
Hoefert |
| Gandalf Mobile Dispatch |
|
Licensed to American United Cab in
Milwaukee area, evidence of MDT usage. |
152.42 in Milwaukee, WI |
|
Sean Douglas, anonymous |
| DDS 4800bd QPSK |
Digital Dispatch Systems |
Licensed to Yellow Cab in Milwaukee area,
evidence of MDT usage, credit, GPS. |
152.33 in Milwaukee, but any
NFM poss |
More info |
Bob Brown |
| IP MobileNet |
|
19.2kbps MDT system. TDMA
voice capable using INVADR (formerly Electrocom) ( likely 4-level FSK with
FEC, native IP communications) |
139.375 by the WI State
Patrol, 852.6125 Rock Co, WI? |
More Info |
Barry W, Jim Korth |
| ATCS Spec200 |
Automatic Train Control
System |
4800 baud data system
somewhat similar to MDC4800. US Nationwide license to American Ass'n of Railroads (AAR) |
Standard 6 base and 6 mobile
freqs allocated nationwide US in 935-940 band. |
More
info |
Dave Huoy |
| EOTD |
End of Train Device |
Used to monitor and control
air pressure, etc on US trains. AAR
standard 1200bd FSK protocol. |
457.9375, 452.9375 |
More info |
1200/1800Hz Mark/Space |
| ARES Railroad Telemetry |
|
Used by the BNSF railroad. Data
transmission protocol is same as ACARS, datagrams same as ATCS. |
161.325, 160.365 Northern IL |
More
info |
Dave Huoy |
| Harmon MCS-1/2 base |
|
As used on the CP railroad
in WI on the 952MHz band, base side
for signal and track control |
952.28125 in Jefferson Co,
WI |
|
Erik Coleman |
| Harmon MCS-1/2 wayside |
|
As used on the CP railroad
in WI on the 928MHz band, wayside for signal and track indication |
928.28125 in Jefferson Co,
WI |
|
Erik Coleman |
| Mobile Data Systems MDS9710 - RR Base |
|
As used on the CN railroad
on the ex-IC Dubuque Sub on the 941MHz band, base side for signal and track control |
932.34375 at Freeport, IL |
|
|
| Mobile Data Systems MDS9710 - RR Wayside |
|
As used on the CN railroad
on the ex-IC Dubuque Sub on the 932MHz band, base side for signal and track control |
941.34375 at Freeport, IL |
|
|
| Union Switch & Signal 550 Flexicode
base |
|
As used on the UP railroad
on the 952MHz band, wayside for signal and track control |
952.13125 on the UP at
Ellis, IL |
|
Doug Nipper (sample)
Anonymous (ID)
|
| Union Switch & Signal 550 Flexicode
wayside |
|
As used on the UP railroad
on the 928MHz band, wayside for signal and track indication |
928.13125 on the UP at
Ellis, IL |
|
Doug Nipper (sample)
Anonymous (ID)
|
| Harmon HP-1 Railroad Codeline Base |
|
As used on the CN/IC
railroad on the 952MHz band, wayside for signal and track control |
952.18125 on CN/IC at
Tolono, IL |
|
Doug Nipper |
| Harmon HP-1 Railroad Codeline Wayside |
|
As used on the CN/IC
railroad on the 928MHz band, wayside for signal and track control |
928.18125 on CN/IC at
Tolono, IL |
|
Doug Nipper |
| Mobitex |
|
As used in US by RAM mobile data. |
935-940 MHz band US |
|
anonymous from UK |
| CDPD |
Cellular Digital Packet Data |
Typically uses vacant
cellular voice channels to transmit 19200 baud data. FedEx apparently uses a dedicated frequency system in Chicago on
860.8625 and other freqs. |
|
|
Steve Donnell |
| Paknet |
|
This is another British
commercial data system. It uses an X.25 access system. |
164 MHz UK |
|
anonymous from UK |
| NMT-450 |
Nordic Mobile Telephones
control channel |
It is a very primitive
network (first generation) and uses analog FM with 25 KHz spacing. Similar is
NMT-900. |
463-470 in Sweden |
|
Alex Skafidas, John
Kristian Snekvik, anonymous |
| LoJack |
|
Not sure what protocol this
is, but it is used to direction find stolen vehicles and/or disable ignition. |
173.075 nationwide US |
|
|
| Cognito |
|
This is another British
commercial data system |
178 MHz UK |
|
anonymous from UK |
| GSM digital cellular |
Global System for Mobile |
This form of digital voice
transmission is very common in North America, Europe, and the Middle East |
890-915 MHz EU? |
More info |
|
| D-AMPS Cellular voice |
Digital-Advanced Mobile
Phone Service |
The TDMA based digital
standard for the legacy 800MHz cellular system in the US, allowing for 3
conversations per 30kHz channel. |
879-881 MHz US |
|
|
| AMPS Cellular Control Channel |
Advanced Mobile Phone
Service |
This channel tells cell
phones what channel to use for voice, and other information. |
879-881 MHz US |
More info |
|
| Motorola Type 1 (old) Trunking Control Channel |
|
This 3600 baud channel is
used to tell mobile radios which voice frequency to use. |
851-869 MHz band US, others |
More info |
|
| Motorola Type 1 (newer) or Type 2 Trunking Control
Channel |
|
As above, but the sound
here is nearly the same for newer Type 1, and all flavors of Type 2, except
networked systems. |
851-869 MHz band US, others |
More info |
|
| Motorola Networked Trunking Control Channel |
|
As above, Networked, or
"Smartzone" systems use Type 2 style IDs, which can span across
many distinct transmitter sites over a wide area. |
851-869 MHz band US, others |
More info |
|
| Motorola ASTRO APCO-25 Trunking Control Channel |
|
This 9600 baud channel is
used to tell mobile radios which voice frequency to use. ASTRO is a
digital/analog voice trunked radio system. APCO-25 makes it industry
standards compliant for smooth interaction with neighboring systems. |
851-869 MHz band US, others |
More info |
|
| Motorola IMBE (ASTRO APCO-25 Trunked) Digital Voice |
Improved Multi-Band
Excitation |
This is to be the Common
Air Interface (CAI) specified by the APCO-25 standard. State of MI State Police, also on a 400 MHz
military TRS. The military system is not using a 9600bd control
channel, but seems to be using the same voice format. |
|
More info |
|
| EDACS (Ericsson) Trunking Control Channel |
|
This 9600 baud channel is
used to tell mobile radios which voice frequency to use. |
851-869 MHz band US, others |
More info |
|
| EDACS (Ericsson) Narrowband Trunking Control Channel |
|
This 4800 baud channel is
used to tell mobile radios which voice frequency to use. NIPSCO, the northern Indiana
power utility has a multi-site networked system. |
935-940 MHz band US |
More info |
|
| Aegis Digital Voice (Ericsson) |
|
Digital voice format
incorporated into EDACS trunked systems. |
|
More info |
Charles Guerin |
| VSLEP Digital Voice |
|
Digital voice format as
used by Motorola radios prior to IMBE format. |
|
|
Rich Carlson |
| OTAR |
Over The Air Re-key |
Transmitted to DES capable
radios to update encryption key. |
160MHz Fed Band US |
|
Lindsay Blanton |
| DES Encryption |
Digital Encryption System? |
Probably the most common
encrypted digital voice format.
Commonly heard on same freqs as analog voice. |
160MHz Fed Band US, various
PDs |
|
|
| DES Encryption - Trunked |
|
Same as DES, but on a
Motorola trunked system. Note lack of high pitch at end of transmission |
Motorola TRS |
|
|
| KY57/58 Encryption |
|
Military Voice encryption
standard, heard on aircraft/base comms here |
UHF air band 376.1 AM |
|
Mike Hein, others |
| Racal Cougar Voice Encryption |
|
Voice Encryption used by
military and special law enforement units. |
Mostly UK. |
|
Bob |
| Voice Inversion Scrambling |
|
Simple voice inversion
scrambling. Not digital, per se, but
interesting. |
|
F1 Scanner Group |
Bob |
| TETRA |
Trans-European Trunked RAdio |
Digital trunked radio,
primarily European |
390.2375 NFM in Spain |
|
Miquel in Spain, Rickey
Stein, and anonymous |
| EFJ LTR Trunking Control subaudible |
Logic Trunked Radio |
EF
Johnson trunking format. This subaudible tone sequence is used to tell mobile
radios which voice frequency to use. You will need a set of HEADPHONES or
speakers/amplifier with plenty of bass response to hear anything as these
tones are "SUBAUDIBLE". The audible tones you hear is just a
telephone ring. |
851-869 MHz band US, others |
|
Bruce in Colorado |
| M/A-Com - OpenSky Data Network |
See CDPD, above |
Apparently uses private
CDPD for data. Voice is a 2 slot TDMA
AMBE CODEC from DVSI and likely sounds different from this. |
851-869 MHz band
Pennsylvania state system |
More
info |
http://www.wpascanner.com/ |
| 220 MHz SEA LTR Trunking Control pilot tone |
Logic Trunked Radio |
As heard in NFM, but
actually uses ACSB (similar to SSB) for voice comms. The pilot tone is
transmitted about every 10 seconds. In Milwaukee, 220.0125 is one
frequency, but you may have to tune up or down a bit to hear it. Sorry
for the scratchy copy, I'll work on a better sample. |
220-222 MHz ACSB |
|
|
| GE MARC-V Trunking |
|
A trunking system which
does not use a control channel. No
longer implemented in the US, some systems linger. |
|
More info |
Isidoro Hernandez,
Carolina, Puerto Rico. Also Matthew
Sadler. |
| Midland CMS Trunking Control |
|
In Jasper, IN area, also in
Ottawa, Ont. David confirmed the type. |
857.0875Mhz in Jasper, IN |
|
Chris in IN, David Harris
in Ont |
| MPT 1327 Trunking Control Channel |
Ministry of Post and Telecom |
This format is very common
in European countries, Australia, and South Africa. Might be commonly referred to as TaitNet.
This channel is used to tell mobile radios which voice frequency to use. |
More info |
More info |
anonymous from UK |
| MPT1317 |
|
A data format found in the
UK. It is a variant of MPT1327. |
86.5875 MHz UK |
|
anonymous from UK |
| Motorola iDen (Nextel) |
|
A digital modulation scheme
used by the Nextel digital cellular system. |
851-869 MHz band US |
More
info |
|
| ACARS |
Aircraft Communications And
Reporting System |
Used to transmit aircraft
waypoint, temperature, performance, and other data between to and from the
ground station. |
131.55 MHz AM |
More info |
|
| SCADA telemetry |
Supervisory Control And Data
Acquisition |
Technically this isn't a
mode, but a generic term for a data acquistion means. Some of possible data
protocols are SC-1801, Harris 5000/6000/XA-21, Telegyr 8979, TRW-9550, and
PERT 26/31. This particular signal is heard in the Milwaukee, Wisconsin area.
It is a wide signal spanning 952.250 thru 952.750 MHz with this audio being
recorded from the center of 952.500 MHz WFM. I have observed directional
900MHz antennas in use at various utility shacks, so I suppose it could be
monitoring or control telemetry from these. |
952.50625 MHz WEPCo |
|
anonymous local |
| SSR |
Secondary Surveillance Radar |
used to transmit an
aircraft's ID number and altitude to ground controllers. It is otherwise
known as a transponder and the transmissions are referred to as
"squawks". Aircraft squawk on 1090 MHz when interrogated by ground
radar. Listen in SSB or AM mode. |
1030, 1090 MHz |
|
|
| DMB |
Data Marker Buoy |
US Coast Guard drops these beacons to pinpoint Search And Rescue positions
and monitor drift of wreckage. Continuous tones. This one was set to
242.65 MHz. I'm told ELT's on 121.5 sound the same. |
243, 121.5 MHz AM |
|
|
| EAS |
Emergency Alert System |
tone sequence which has
replaced the old EBS annoying tone. These new tones will be used on
commercial and National Weather Service radio stations and carry location-specific emergency
messages (SAME). |
162.4-162.55 MHz FM, bcast radio |
|
|
| CompuLert FSK-FM |
Frequency Shift Keying |
Low speed FSK telemetry to
monitor and sound warning sirens. Milw. Co. Emergency Management uses it for tornado siren telemetry. Voice is also on
this freq. |
453.375 Milwaukee, WI |
More info |
|
| Zetron Model 6/26 |
|
1200 baud FSK
telemetry for fire station alerting. |
154.175 Waukesha, WI |
More info |
Frank Monaco |
| Radionics Safecom |
|
Alarm system telemetry. |
? |
|
Jon in Australia |
| GPS RTK |
Global Positioning Satellite
Real-Time Kinematics |
Not sure if this is a
standard protocol, but the signal is definitely being transmitted from a GPS
survey unit to improve accuracy, as close as 1 cm |
various |
More Info |
|
| TAG CTX330 F1 Telemetry |
|
Formula 1 Grand Prix car to
pit |
|
F1 Scanner
Group |
Bob |
| Magneti
Marelli F1 Telemetry |
|
Formula 1 Grand Prix car to
pit |
|
F1 Scanner Group |
Bob |
| Magneti Marelli
F1 Telemetry |
|
Formula 1 Grand Prix car to
pit |
|
F1 Scanner Group |
Bob |
| Magneti
Marelli F1 Telemetry |
|
Formula 1 Grand Prix car to
pit |
|
F1 Scanner Group |
Bob |
| Pi Research Pi96 Fq
Telemetry |
|
Formula 1 Grand Prix car to
pit |
|
F1 Scanner Group |
Bob |
| Pi Research Pi96 Fq
Telemetry |
|
Formula 1 Grand Prix car to
pit |
|
F1 Scanner Group |
Bob |
| Pi Research Pi96 Fq
Telemetry |
|
Formula 1 Grand Prix car to
pit |
|
F1 Scanner Group |
Bob |
| TAG CTX400 F1 Telemetry |
|
Formula 1 Grand Prix car to
pit |
|
F1 Scanner Group |
Bob |
| TAG CTX400 F1 Telemetry |
|
Formula 1 Grand Prix car to
pit |
|
F1 Scanner Group |
Bob |
| Magneti Marelli Step 9 ECU |
Engine Control Unit |
Formula 1 Grand Prix car to
pit |
400.825 in Canada |
|
Charles in Montreal, Bob |
| . |
|
|
|
|
|
| . |
|
. |
|
|
|
| Mysteries! |
|
Heard from home or as
noted. |
|
|
|
| . |
|
. |
|
|
|
| Mystery Railroad Codeline |
|
As used on the P&L RR
in Kentucy for signal and track control |
160.455 on the P&L |
|
Chris Dees |
| Mystery 864.0875 |
|
As used on an LTR trunked
system in Milwaukee, probably an MDT of sorts. |
|
|
|
| Mystery FAA Windshear telemetry |
|
As used at the Madison
airport for a type of weather conditions monitoring system. 6 bursts
from different transmitters, with about a 20 second pause between cycles. |
162.275 in Madison, WI |
|
|
| Mystery 152.54 |
|
As used on what used to be
an Ameritech IMTS
frequency. |
|
|
|
| Mystery 453.375 |
|
Heard from a distance, a
constant tone. |
|
|
|
| Mystery 154.46375 |
|
Power/water utility
telemetry, at least in Northern IL, is used to control "power line caps
(capacitors)" which compensate for load varitions in the power grid. |
154.45635, 154.46375,
154.47135, 154.47885 US allocations |
|
anonymous in IL, please
remind me what the "name" of the protocol or mode is. |
| Mystery 467.9 |
|
Data from survey equipment
as used by Edgerton Contractors levelling a grade, hand-held style radio visible attached
to portable unit |
|
|
|
| Mystery QuickSilver |
|
QuickSilver Couriers MDTs on 864.7375 and others on an LTR trunked system in
Milwaukee. |
|
|
|
| Mystery MCTS |
|
Milwaukee County Transit
System uses this data for AVL fixes and misc MDT
stuff. |
|
|
|
| Mystery VSELP? |
|
Pretty sure this is VSELP
(Vector Sum Excited Linear Prediction) digital voice. Used in
conventional mode on a MI gas utility on 451.075 and reported as used by the Secret Service in
PA. |
|
|
Michael in PA |
| Mystery MDT |
|
Licensed and confirmed to Wisconsin Gas in Milwaukee
area, evidence of MDT usage. |
|
|
|
| Mystery RD-LAP? |
|
Licensed to MI Gas in Grand
Rapids area. Sounds like RD-LAP at an
odd bit rate. |
|
|
|
| Mystery MDT |
|
Licensed to John Aegerter in Milwaukee
area, evidence of MDT usage, possibly Butler, WI PD. Possibly Cerulean brand Packet-Cluster MDT
service, maybe transported by a DataRadio RF modem. |
152.69 in Milwaukee, WI,
others |
More info |
Bob Brown |
| Mystery MDT |
|
Believed to be a Motorola
MDT format. |
453.1 in Hidalgo Co, TX |
|
T. in TX |
| Mystery ANI or squelch system? |
|
Possible squelch system used at end of transmission
for mobiles. |
|
|
Dan Morley |
| Mystery |
|
Telemetry? In Jasper, IN
area. |
|
|
Chris in IN |
| Mystery digital voice |
|
Formula 1 Grand Prix car to
pit |
414.175 in Canada |
|
Charles in Montreal |
| Mystery telem/voice |
|
Formula 1 Grand Prix car to
pit, possibly scrambled, possible interspersed telemetry |
457.275 in Canada |
|
Charles in Montreal |
| Mystery telemetry |
|
Possible survey data from
local municipality. |
452.825 in Milwaukee, WI |
|
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| Mystery status box |
|
As used by a cement truck
firm. |
452.25 in Milwaukee, WI |
|
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| Ontario Provincial Police Trunking |
VHF Modat trunking based on
MDC1200 |
As heard in Canada. Marker
channel. System phasing out in favor
of ASTRO trunked. |
141.450 in Canada |
recording in AM? |
Paulo Lima in Canada, David
Harris |
| Mystery telemetry |
|
BC Forest Service weather
telemetry |
402.0375 in Salmo, BC |
|
Neil Walker in BC |
| Mystery Utility telemetry |
|
Utilicorp Canada |
155.325 in Trail, BC |
|
Neil Walker in BC |
| Mystery telemetry |
|
Teck-Cominco |
457.0125 in Trail, BC |
|
Neil Walker in BC |
| Mystery MDT |
|
Used by police in Netherlands |
|
|
Huub Roem |
| Mystery |
|
Possible hospital paging,
sent every minute |
29.9 NFM in Norway |
|
John Kristian Snekvik |
| Mystery |
|
Possible security company
freq |
142.425 NFM in Norway |
|
John Kristian Snekvik |
| Mystery (ISS?) |
|
Possible xmission from
International Space Station's Russian Zvezda module |
143.625 NFM in Norway |
|
John Kristian Snekvik |
| Mystery telemetry |
|
Possible power plant telem
(Trondheim?) |
166.250 NFM in Norway |
|
John Kristian Snekvik |
| Mystery Trunked Radio System |
|
Norwegian Railways -
Possible trunked system? |
467.700 NFM in Norway |
|
John Kristian Snekvik,
Martin Kristiansen |
| Mystery |
|
Possible trunked system |
834.025 NFM in Norway |
|
John Kristian Snekvik |
| Mystery |
|
Military in Netherlands? |
455 MHz band in Netherlands |
|
Hans |
| Mystery |
|
Something in Canada? |
424.3125 heard from Niagara
Falls area |
|
Mike Trank |
| Mystery Fire Dispatch |
|
Used over an EDACS trunked
talkgroup for FD station dispatch data.
Sounds like AX.25 but does not decode. |
Hartford, CT EDACS system |
|
Chris Gordon |
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| Links! |
|
Yep,
other folks are warped enough to do this too! |
| Mostly
HF samples |
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| More HF samples |
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