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220 sounds

Audio and sounds files

Radio amateur communications and other transmissions

Here are some hundreds of amateur radio recordings, including QSO, aurora traffic, meteor scatter, communications with ISS crew and the sound of various transmission modes that you can hear on HF and VHF bands.

Most HF recordings were performed using a transceiver connected to either a G5RV dipole or a simple vertical antenna installed in LX or ON (cf. antennas). No filtering (DSP) nor RIT or IF Shift was used to preserve the original sound. As usual, many DX stations were subject to big pile-ups.

Note that you can identify the country of each call sign listed below in downloading the sheet of DXCC entities (xls).

In some recordings we do not always hear comments of some radio amateurs because of the working conditions (split of RX/TX, time of the day, sensitivity of the receive system, location and distance of both contacts, fading aka QSB, and static aka QRN).

For RF or digital messages listed in the "Transmission modes section", you can use multi-mode decoders to translate them. Read also my history of amateur radio for more detail about AMTOR and other PSK31 modes (mainly from years 1980s).

A DX station in pray of pile-ups : AH0J, Mariana islands. QSL released in 2015. Listen to the pile-up.

You will find additional recordings of rare CW/SSB QSO on K8CX's website, recordings of broadcast stations on BCLworld and interesting ATC archives at LiveATC.

At last, since 2014 a signal identification guide including tens of audio files with a waterfall display is available on SigidWiki, a free wiki that you can complete with your own recordings and descriptions.

You will find on this page numerous scientific recordings like the sound of meteor showers, auroral emissions, geomagnetic storms, solar flares, Jupiter and Saturn hisses and bursts, pulsars, interstellar palsma, natural phenomena, and more.

You will find on this page recordings related to astronautic events, transmissions from satellite and other spacecrafts, as well as reports from astronauts and cosmonauts on orbit.

You will find on this page commentaries extracted from films, sounds and music samples used on this site to illustrate some subjects. 

Check also my animations for hundreds other videos and films.

In addition, audio CDs gathering sounds of tens of transmission modes can be purchased from Gerhard Beck and Klingenfuss websites.

Documents listing a callsign or a link are on loan by their author and copyrighted. If you want to use these files, please ask first the permission to the concerned person. Even if a QSO can be assimilated to a public transmission on the air, shared with listeners too, like any intellectual activity, the QSO's initiator holds the right to grant or deny the publishing of his or her communication.

Formats : WAVMP3 RAM WMA

Oldies and Historical Events

86 KB

CBS interrupting its programs to announce the airraid on Pearl Harbor on December 7, 1941

528 KB

The Message of President Roosevelt qualifying the airraid on Pearl Harbor as a "day of infamy".

64 KB

BBC "V" jingle with german jam. Message recorded in 1944

325 KB

"Ici Londres. Veuillez écouter maintenant quelques messages personnels.

 L'éléphant s'est cassé une défense, nous répétons..."

158 KB

"Les sanglots longs des violons de l'automne, bercent mon coeur d'une langueur monotone"...  

 (D-Day started next day). Two recordings reconstituted

87 KB

"Clémentine peut se curer les dents"... Recording reconstituted

172 KB

Reconstitution of the Titanic (MGY) CW transmission at 21 WPM partly covered with noise and fading sending "...MGY CQD SOS SOS CQD CQD DE MGY WE ARE SINKING FAST PASSENGERS KEIN...

372 KB

Reconstitution by the author of the Titanic (MGY) CW transmission at 40 WPM sending "CQD CQD SOS DE MGY MGY REQUIR IMEDIAT ASISTANC POSITION 41.46 N 50.14 W"

VoIP communications

612 KB

HamSphere (v3.0) communication between amateurs. Document HamSphere.

64 KB

Welcome message on NH6XO-R relay located at Honolulu, Hawaii on Sep 17, 2003 linked to Echolink

97 KB

Welcome message in French on ON4MAX-L transponder linked to Echolink, 17 Sept. 2003

Radio amateurs in QSO (Satellite, EME, MS, Aurora)




1.2 MB

Recording from Suitsat, alias RS0RS, delivered on the air on February 17, 2006 including the SSTV message in the second part. Recorded by VE6BLD on 145.990 MHz FM at 0143 UTC. Suitsat still worked that day until about 10:59 UTC (received by N2SPI) then ceased transmitting.

371 KB

Recording from Suitsat, alias RS0RS, delivered on the air on February 8, 2006. Recorded by VE6BLD on 145.990 MHz FM.

354 KB

Suitsat, alias RS0RS message (noisy with fading) delivered on the air on February 6, 2006. Recorded by VE6BLD on 145.990 MHz FM. The message is "This is suitsat-1 amateur radio station RS0RS. Greetings to the students around the world. This is a message from [...] to americans and the united states. We share a mutual excitement about the future of space travel. The USA special word is FREEDOM". 
The transmitter on-board Suisat was a Kenwood TH-K2 handheld transceiver emitting with 1W PEP. Its signal was loud and clear in all countries from PY, K, VE, NL, AU or ZS. Unfortunately, Suitsat batteries have frozen after 12 days. It ceased all transmission as soon as in voltage dropped below 9 V although the computer was still active down to 3 V. More information on AMSAT or PD0RKC.

564 KB

Fabiano, PY5RX working NA1SS (Bill McArthur) in February 12, 2006 at 13:12 UTC given him a status of receive conditions of Suitsat. 

1.4 MB

NA1SS (Bill McArthur) during his EVA after have launched Suitsat on February 6, 2006 asking capcom at Houston about receive conditions at ground. Capcom was also curious about Bill's 1000 radio amateurs contacts and how he manage his QSL. Recorded by PD0RKC.

1.1 MB

ISS, QSO recorded on Aug 7, 2002 between Peggy Whitson, KC5ZTD, for NA1SS, and the European Space Center at Redu (B), ON4ESC on 145.200/145.800 MHz

103 KB

ISS, QSO recorded on Aug 18, 2002 between RS0ISS for NA1SS and VA2CST on 144.490/145.800 MHz

601 KB

Mir, QSO recorded on July 31, 1999 between Jean-Pierre Haignere on Mir and G0SFJ on 145,200/145,800 MHz (bilingual French - English)

615 KB

Communication with Mir recorded on Aug 5, 1999 (format VQF). Document Thierry Fricot.

960 KB

VK3UKF working VK3JOO via UO-14 ham satellite in FM on Feb 21, 2002

553 KB

VK3UKF working ZL1HAU via UO-14 ham satellite in FM

79 KB

Packet transmission in PCSat mode with UO-40 ham satellite on March 24, 2003 worked by VK3UKF

107 KB

PSK, Telemetry of FUNCUBE 1 satellite, 145.935 MHz

136 KB

EME QSO worked by IY4FGM/4 and F2TU at 2401 MHz (23 cm) in SSB

212 KB

EME QSO worked by HB9BBD and LX1DB in SSB

391 KB

EME QSO worked by G4DZU and OE9XXI in SSB

336 KB

EME QSO worked by DL0SHF and HE9ERC in SSB

228 KB

EME QSO worked by F1ANH in SSB

359 KB

EME QSO worked by W5UN in SSB

240 KB

EME QSO worked by HB9BBD and KD4LT in CW

222 KB

EME QSO worked by JA6CZD and HB9BBD in CW

65 KB

Meteor Scatter QSO worked by F6CRP in SSB

37 KB

Meteor Scatter QSO worked by LY2WRP in CW

1 MB

Aurora VHF QSO worked in CW by GM4VVX (QTH loc : IO74VA) and DL6YEH. The gosthy like sound (or lack of modulation) is typical of Aurora traffic

Radio amateurs in HF bands (SSB)

4 KB

DP1POL in Antarctica in QSO (big pile-up !), 20m, 23:59 UTC, 7 March 2003

1.5 MB

VE3YJ in Canada working RZ6ANV on 20m, 23:20 UTC, June 2015

1.2 MB

W2W in the U.S.A (special call) working UK1THA and others on 20m, 20:58 UTC, June 2015

793 KB

FS4WBS in Saint Martin working FS5QS (5 up) on 20m, 05:57 UTC, June 2015

634 KB

FG4NN in Guadeloupe working RW5FD on 17m, 18:57 UTC, June 2015

874 KB

6Y5TR in Jamaica working VE1BB on 20m, 23:36 UTC, June 2015

960 KB

VP2ETE in Anguilla working W1WM on 15 m, 23:32 UTC, June 2015, with QRN

839 KB

9Y4D in Trinidad & Tobago working 9H5RJ on 20m, 23:29 UTC, June 2015, pile-up

1.2 MB

WP4MPV in Puerto Rico working EA5FWW on 20m, 22:59 UTC, June 2015

484 KB

CO6LC in Cuba working AB1UT on 20m, 22:45 UTC, June 2015

1.2 MB

HI8JSG in Dominican republic working EA9SV on 20 m, 21:36 UTC, June 2015

1 MB

4V200YH in Haiti on 40m, Feb 2004

909 KB

FY/F5UII in French Guiana working 5 to 10 up EA1XT and F8OEI (weak) on 15 m, June 2015

1 MB

HK3C in Colombia working G0MBA (weak) on 20 m, 22:40 UTC, June 2015

517 KB

TG9IIN in Guatemala working IZ1YQV on 15m, 21:51 UTC, June 2015

420 KB

PT7BZ, Ali, in Brazil working DL6LBD, YL Lisa, on 20m, 30 April 2003

298 KB

PT7BZ working UA6AQS on 20m, 30 April 2003

806 KB

LU3MCJ in Argentina working OK2BIQ on 20m, 22:30 UTC, June 2015

1.8 MB

CE6/CX1RP in South Chili worked by F5OUX in France, 59+25 dB on 10m, May 2015

123 KB

VP8THU in South Sandwich islands working GM4WJA on 10m, Jan 2002

625 KB

VP8LP in Falkland islands (îles Malouines) working DL7NN on 17m, 20:09 UTC, June 2015

644 KB

ZD7VC in St Helena island working IK2ODD on 20m, 20:51 UTC, June 2015, QRM

655 KB

OX/DL7DF in Greenland working RU1AB on 17m, 13:23 UTC, June 2015

344 KB

JW9JKA in Svalbard working LY1FM on 20m, 13:26 UTC, June 2015

678 KB

TF2MSN in Iceland working EA5ILK on 20m, 22:08 UTC, June 2015

1.5 MB

GI4MBM in North Ireland working CX7OV in Uruguay (weak) on 40m, 22 UTC, June 2015

1.2 MB

ON4UB, the national belgian station, working ON6LI (YL) on 80m, 11:50 UTC, June 2015

1.15 MB

F5OUX working VK4CQ in Australia at 00:30 on May 21, 2015 on 28.430 MHz, skip distance of 23516 km, SSN=36. 10-element beam, 50W. NB. There was a radio blackout 72 hours earlier.

1.88 MB

F5OUX working ZL3TEN/B in New Zealand on 28.228 MHz with 10W and l/4 vertical, May 2015

3.47 MB

F5OUX working ZL2OK, VK4CZ and ZL2FT on 28.430 MHz. 10-element beam, 50W, May 2015

101 KB

F0DIA/P working from Mont Blanc refuge in JN35KV at 3843 m of altitude, 144.330 MHz, Mar 2003

1.8 MB

PA0SNY/AM (Aeronautical Mobile) aboard a Boing 747-400 (PH-BFV), flight KL9866, 40000 ft over St-Petersburg working EB1CAM on 14330 kHz 16:09 UTC, June 2015

1.9 MB

DF1CHB/AM (Aviation Mobile) op. Cyril (F5OUX) working on 29020 kHz aboard a Boing 737, 30000 ft above West France

600 KB

HB0/OE5REO/P in Lichtenstein working UR5QW on 20 m, 12:58 UTC, June 2015

1.1 MB

T77LA in San Marino working AK4QA on 20 m, 07:34 UTC, June 2015

293 KB

E73E in Bosnia-Herzegovina working I2YBY on 20 m, 11:59 UTC, June 2015

751 KB

D0B (QSL Mgr RW6HS) in Donetsk Republic working YO5PNF on 20 m, 19:26 UTC, June 2015

Donetsk Republic is a secessionist land from Ukraine since 2014, it is not an official DXCC

1.3 MB

Z33Z in Macedonia calling NA, SA and working W2PJ on 20 m, 22:55 UTC, June 2015

1 MB

9H5TS in Malta working JH7FMJ on 17m, 20:02 UTC, June 2015

380 KB

ZB2JK in Gibraltar working WA1SAZ on 15m, 19:42 UTC, June 2015

478 KB

RT5G in European Russia, YL from the club station CQing on 40m, 20:14 UTC, June 2015

677 KB

RK9UN in Asiatic Russia (Siberia) working K3NUI and others on 20m, 23:41 UTC, June 2015

290 KB

OD5ZZ in Lebanon working R5DU on 15m, 10:12 UTC, June 2015

1.1 MB

E41WT in Palestine working MS0IXD and others, 20m, 15:59 UTC, June 2015

800 KB

EP2C in Iran (weak) working EW1HI on 20m, 09:54 UTC, June 2015

1.7 MB

7Z1SJ in Saudi Arabia working N4WZ and others, 20m, 00:25 UTC, May 2015

951 KB

HZ1HZ in Saudi Arabia, YL Laila working UA9CGL on 15m, 16:42 UTC, June 2015

581 KB

A61DA in UAE working RZ1AS on 15m, 12:50 UTC, June 2015

649 KB

A92HK in Bahrain working PY1SX on 17m, 1727 UTC, June 2015

457 KB

SU9IG in Egypt working DG3KCL (weak) on 20m, 19:47 UTC, June 2015

800 KB

5U5U in Niger working F4FSY on 15 m, 07:49 UTC, June 2015

452 KB

TR8CA in Gabon working IK5OWQ on 15m, 17:15 UTC, June 2015

547 KB

XT2AW in Burkina Faso working F8ATM (weak) on 17m, 18:45 UTC, June 2015

433 KB

TN/CT1FJZ in Rep. of Congo (weak) working IK8INR on 17m, 19:46 UTC, June 2015, with QRN

379 KB

3DA0TM in Swaziland calling CQ on 20m, 16:45 UTC, June 2015, with QRN

980 KB

ZS5DCF in South Africa working ES7GN on 20m, 17:13 UTC, June 2015

305 KB

5R8UI in Madagascar working LA1KUA on 17m, 18:53 UTC, June 2015

889 KB

FR5CB in Réunion island working DF8XC on 20m, 16:44 UTC, June 2015, QRN

690 KB

8Q7CQ in Maldives islands, listening 5 to 7 up on 20m, 18:45 UTC, June 2015

577 KB

4S6NCH in Sri Lanka working SV1IZY on 20m, 19:20 UTC, June 2015

900 KB

XU7TZG in Cambodia CQing on 20m, 17:14 UTC, June 2015

1.5 MB

YE6YE in Indonesia replying to NP4A (pile-up) on 40m, 23:27 UTC, June 2015

800 KB

9M2SE in South Malaysia, CQ from AS-046, working DL3FCG on 20m, 18:24 UTC, June 2015

1.2 MB

BT7BM in China working IT6TMZ (weak) on 15m, 18:05 UTC, June 2015

407 KB

VR2XMT in Hong-Kong working ON4PG on 15m, 12:55 UTC, June 2015

953 KB

AH0J in Mariana island working OH2FNR, DC9XU and others on 17m, 15:40 UTC, June 2015, QRN

825 KB

VK3MO in Australia using 4x5ele monoband at 60m working W3WC on 20m, 12:55 UTC, June 2015

4 KB

T31MY2 in Central Kiribati working US stations on 12m, 19 Feb 2003

156 KB

FO5JV in French Polynesia working F5NOD (weak) on 20m, 16:16z, 2002

Special events and contests

438 KB

200 years of Battle of Waterloo Commemorative Event, OO200WTO, op. ON7WR in Belgium working PA7K on 40m, 11:52 UTC

792 KB

D-Day Commemorative Event, W2W in Baltimore on 15m, 16:16 UTC, Operating from 3-10 June 2015

606 KB

Olympic Games, 4K2015BAKU in Azerbaijan on 12m, 11:00 UTC, June 1015

1.5 MB

90th birthday of REF (France), TM90REF on 40m, 21:47 UTC, May 2015

897 KB

Flora Fauna activity (FF-1525 Givet), TM08FF in France on 40m, 14:09 UTC, June 1015

1.5 MB

DFCF activity (DFCF 80140 and 005), F2YT/P in France on 40m, 08:19 UTC, June 1015

373 KB

Deutch Kingdom contest, P43A in Aruba working M0MCV on 20 m, 20:48 UTC, June 2015

806 KB

Seanet contest, JA3AOP in Japan CQing on 15m, 16:35 UTC, June 2015

1.9 MB

IARU contest 2003, R7HQ near Moscow (ops RV1AW, Arno) working 77 stations in 16 minutes on 20m. Document RU1A

516 KB

CQ WPX Contest 2002, AL1G in Alaska working KL7FH on 15m, recorded by KB9UWU

970 KB

CQ WPX Contest 2001, WL7E in Alaska and WL7RA (both VFOs work simultaneously on the RTX)

Amateur radios working during emergency situations

399 KB

Bharathi Prasad, VU2RBI calling for help from Sri Lanka after the tsunami of december 26, 2004. She was in DX-pedition with VU4NRO on Andaman Island when the earthquake and the tsunami hit the region. She immediately shifted to an emergency operation. The emergeny network worked on the primary frequency of 14.190 MHz and on Echolink.

1.3 MB

KB3JUV giving a status report about hurricane Isabel to Net control of National Hurricane Center via Echolink, 18 Sep 2003, relay 147.060 kHz.

664 KB

KI4BTD (FL) in emergency QSO on Echolink via the K40BX-R VHF relay (VA) on 17 Sep 2003

When the ham spirit is tarnish

1.2 MB

Khaos during the pile-up for E41WT in Palestine on 20m (the operator uses the call by number but it was not respected by amateurs forcing the operator to QRT for 1 hour).

1.2 MB

QSO between ZS5DCF and RA4PQ continuously interrupted on 20m by amateurs who do not listen and create QRM

1.7 MB

FR5CB trying to work OK1FGS on 20m through the QRM. On the cluster, GW3RIH qualified the situation "The ZOO is open" !

625 KB

VP8LP would have well continued working european stations but after have been disturbed by impatient and tactless amateurs from EA, he decided to QRT due to QRM this evening on 17m.

793 KB

ZD7VC calling Asia but Europe and North Africa reply without listening on 20m.


259 KB

French cosmonaut on Mir disturbed by tactless amateur (in French).

Transmission modes (amateurs)




428 KB

Beacon transmitted by VA3GRR with 4 W output on 28.205,6 MHz (signal RST=579)

1.1 MB

GB3SEE beacon in JT65 mode (USB) on 1036.8821 MHz or 3 cm-band (SHF), 20h51 UT,  June 2015, and repeating. More info about JT65 on YouTube.

80 KB

D-STAR, digital voice at 145.670 MHz, NFM (can be routed over the Internet too, e.g. via webSDR)

289 KB


361 KB


1.3 MB

BPSK31, G4YDO working S51AB on 14.071 MHz, 14:03 UTC, July 2015

140 KB


52 KB

CLOVER 2000 in QPSM modulation (XCLOVER, 250 bps)

273 KB

CW transmission at 5 words per minute sending ON4SKY

215 KB

CW transmission at 20 words per minute (CQ CQ DE ON4SKY 73). The main difference with the 5 WPM is the length of blanck separating each character that is reduced

146 KB

CW transmission at 40 words per minute (CQ CQ CQ DE ON4SKY ON4SKY)

480 KB

CW transmission by DK0WCY of spaceweather information on 10.144 MHz at 15 UTC

148 KB

DominoEX in IFK mode (Incremental Frequency Keying), USB. Can be hear anywhere between 03-30 MHz. Used to send text message.

314 KB

Feld-Hellschreiber transmission (amplitude modulated)

375 KB

Hellschreiber or Hell transmission (phase modulated)

586 KB

FSK (Frequency Shift Keying)

57 KB

GTOR transmission recorded in HF bands

113 KB

GWEN (Ground Wave Emergency Network)

652 KB

JT65, UA3DIB confirming signal from JA3LVJ R-16 on 14.076 MHz, 17:04 UTC, July 2015

166 KB

LORAN-C (Long Range Radio Navigation System)

184 KB

MFSK16 FEC (Forward Error Correcting), a "super RTTY" based on THROB

352 KB

MT-63, calling CQ

118 KB

Packet radio bursts (1200 bauds) recorded by VK3UKF

58 KB

Packet mode Q15X25 15 tones (used by AX.25 interfaces)

201 KB

PACTOR (200 bauds)

332 KB


196 KB


122 KB


178 KB

PSK31 (Phase Shift Keying, 31 bauds), calling CQ in QPSK mode

185 KB

RTTY 45 (45.45 bauds), RU3AMO calling CQ on 14.084,7 MHz, 17:23 UTC, July 2015

57 KB

RTTY 50 bauds transmission

171 KB

RTTY 50 bauds transmission

314 KB

RTTY ITA2 mode at 50 bauds, extract of a weather report

69 KB

RTTY 75 bauds transmission

256 KB


69 KB

SSTV signal

106 KB

SSTV mode Martin1

805 KB

SSTV mode Martin1

2.5 MB

SSTV mode Martin1 recorded by Marius Rensen

314 KB

SSTV mode ML-320

314 KB

THROB transmission, 4-Throbs/sec, center frequency 900 Hz

Transmission modes (professionals)




18 MB

Extract of a communication in clear (not usual, so can be temporary) between submarine Windsor from the Canadian Armed Forces and Canadian Naval Station Halifax Military on March 2015, 00:55 UTC on 6694.5 kHz. Recorded with a WinRadio card WR-G33DDC "Excalibur Pro" connected to a Wellbrook magnetic loop 1530S installed in Forida. Here is a screendump. More info on YouTube

177 KB

ACARS (Aircraft Communications Addressing and Reporting System), 137 MHz, AM

233 KB


148 KB

ADS-B (Automatic Dependent Surveillance-Broadcast) used by aircraft as alternative radar, 1090 kHz, AM, 50 kHz bandwidth

100 KB

AIS (Automatic Identification System used by ships, 161.975 MHz, NFM

201 KB

ANDVT (Advanced Narrowband Digital Voice Terminal) used by US Gov. and Mil.

301 KB

APT (Automatic Picture Transmission of weather image) from NOAA 14 (extract, 10 jul 2002)

35 KB

APT transmission of an infrared image from METEOR 3-05 (satellite in polar orbit)

20 KB

APT transmission of an infrared image (starting) from RESURS 01-04 at 120 lpm

17 KB

AT beacon transmitted on 228.87 kHz

234 KB

Air distress beacon in USB, 121.5 kHz, can be hear at 121.5 MHz for civilians and 243 MHz for military use

182 KB

DCF77, Time station signal from Germany, 77.5 kHz

124 KB

DCF77, Time signal, weaker

263 KB

DGPS (Differential GPS) transmission in QPSK mode

222 KB

DGPS  (Differential GPS) transmission in MSK mode

324 KB

DECCA , LF (70-127 kHz) radio navigation system (today replaced by the GPS system)

172 KB

ERMES (European Radio Message System), 169413 kHz, NFM. Paging system developed by ESTI.

256 KB

GMDSS, maritime safety system, recorded on 4.125 MHz

108 KB

NATO STANAG 4285 (encrypted)

152 KB

NATO STANAG 4285 (encrypted)

521 KB

OTHR (Over The Horizon Radar) 29B6 "Kontayner" on 14530 kHz from Russia (some state that it is located in Singapore, others in Iran, maybe on other frequencies). There is the same noise at 13465,14260, 15060, 19745, 28400 and 28500 kHz. Most of the time it emits at night but also at daytime on weekends. Its bandwidth is 20 kHz but creates QRM over 300 kHz up and down, including in amateur bands where it is the loudest (in USB). Its spectrum at 14260 kHz, in the amateur band, and 14430 kHz is stunning. Read this radio news too released in August 2014. In theory national regulators, if needed in cooperation with ITU, should handle this issue.

142 KB

OTHR (Over The Horizon Radar)


168 KB

OTHR "Woodpecker" from Russia active in 1984. Recorded on the same frequency as the WWV

59 KB

HF-FAX, fax transmission recorded in HF bands (also called SW FAX, radiofacsimilé in French)

782 KB

HF-FAX, test transmission at 240 lpm (Index of Co-operation IOC=288)

96 KB

OFDM HDR (High data rate modem) from Russia in 3 modes : CIS-45, CIS-60, CIS-93, anywhere in 3-30 MHz, USB, bandwidth ~3 kHz, in FSK/OFDM

456 KB

Pager on 26.950 MHz

708 KB

SYNOP transmission by 10 swedish weather stations

4.1 MB

SYNOP transmission by Icelander weather stations recorded by Marius Rensen

224 KB

VFT (or MCVFT, Multiple Channel Voice Frequency Telegraphy)

259 KB

WEFAX (Weather Facsimile) transmission

4.5 MB

WEFAX  transmission recorded at 240 rpm (selecting the visible image) by Marius Rensen

20 KB

WEFAX transmission of a visible image (starting) from NOAA 14 at 240 lpm

120 KB

WEFAX transmission (starting) from METEOSAT

807 KB

WWV time signal (10 kW) from NIST at Fort Collins, Colorado, on 5 MHz at 09:00 GMT (with QRM)

262 KB

WWV time signal (10 kW) from NIST at Fort Collins, Colorado, on 5 MHz at 08:59 GMT (wuth QRM)

61 KB

WWVB signal

314 KB

WWV and WWVH signals. Documents Thierry Fricot.

176 KB

3 CIS-14 signals overlapping, emitted from Russia, speed 100 bd, anywhere in 3-30 MHz, USB, bandwidth 3.1 kHz

4.4 MB

BPL (CPL) interferences on HF ham bands generated by trials in Austria

Air Traffic Control

1.1 MB

Arrival traffic with Atlanta Macey ATC on 121.35 MHz on April 19, 2004

1.0 MB

Arrival traffic with Atlanta Macey ATC on 121.35 MHz on April 19, 2004. YL ops

1.3 MB

Approach/departure traffic with Boston ATC on April 19,  2004. YL ops

1.1 MB

Approach/departure traffic with JFK ATC on 127.4/135.9 MHz on April 19, 2004

DRM stations




1 MB

Radio Luxembourg on Nov 21, 2004 on 6095 kHz

443 KB

Audi sample of DRM speech in English

378 KB

Audi sample of DRM speech in French

1.4 MB

Audi sample of DRM sound

Technical demos




1.7 MB

Noise (RFI) generated by a LED lamp at 1.5m from a low band doublet antenna. Recorded on 3.5 MHz with a FT-817 transceiver

1.2 MB

Ten-Tec ORION 565 panoramic (stereo) audio

80 KB

TS-570D filters : N.R1 on, N.R1 off, N.R2 on, N.R. off in SSB, by JA6QXW

142 KB

TS-570D filters : N.R. off, N.R1 on, N.R2 on, N.R off in CW, by JA6QXW

123 KB

TS-570D filters : BEAT CANCEL on/off, by JA6QXW

111 KB

TS-570D filters : CW filter 200 Hz on/off, by JA6QXW

89 KB

TS-570D filters : TX Equalizer (3 built-in profiles), by JA6QXW

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