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 |
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
Digital Trunking |
See CDPD, above |
Apparently uses
CDPD signalling with voice AMBE CODEC from DVSI |
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 - 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 |
|
|
Mystery Railroad
Codeline - 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 |
|
|
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 |
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)
|
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 |
|
|
Mystery status
box |
|
As used by a cement
truck firm. |
452.25 in Milwaukee,
WI |
|
|
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 |
|
|
|
|
|
|