When you have finished listening to the sound-bites, press the "Sound-Bites" button on the left to return to the Main Page, or press an appropriate button to go to a different section.

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If you can't hear me, don't worry, either you have a slow connection (be patient) or your browser does not support background sound.  However, you will still be able to listen to the sound-bites by clicking on the appropriate coloured text, provided you can handle files in ".MP3" or ".WAV" format.  The MP3 files are much smaller than the WAVE files and will therefore download faster.  However, some of these files may take a few minutes to download over a slow connection.

Here are a few examples of what you might hear on the Amateur Radio Bands, together with explanations of what they are.  I hope that those of you who are not familiar with Amateur Radio will find them interesting.

CQ call (MP3) (WAVE)

This is a CQ call (a "general" call to any station), recorded on the 20m Band.  This station is located in Sicily, denoted by the callsign prefix, IT9.  We have edited this sound clip so that the callsign is not an issued one.

SSB on an AM Receiver (MP3) (WAVE)

This is what an SSB signal sounds like when received on an AM broadcast receiver.  Reception of SSB requires the re-insertion of the suppressed carrier, which is not required with an amplitude modulated signal.  We have included this example as many casual listeners hear their first SSB signals whilst using a short wave broadcast receiver and are puzzled by the apparently very distorted, and usually totally unresolvable signals, they hear on the amateur radio bands.

23cm Beacon (MP3) (WAVE)

This is the Martlesham 23cm Beacon, GB3MHL, located near Ipswich, in Suffolk, transmitting on a frequency of 1296.830MHz, as received under lift conditions at the QTH of G3NPF.  The path length is 173km.  If you listen carefully, you can hear the sidebands of Gatwick radar producing a brief "buzz" every 10 seconds.

Slow Scan Television (MP3) (WAVE)

This is an analogue slow scan television transmission recorded on the 80m Band.  SSTV is a method by which still colour pictures can be transmitted over a limited bandwidth system intended for voice communications, whilst still maintaining reasonable definition.

Packet Radio (MP3) (WAVE)

This is packet radio recorded on 144.900MHz.   Packet radio is a digital data transmission system.  This is a recording of G3NPF downloading data from the local packet cluster node, GB7DXS, located at Ansty, West Sussex.


This is part of an actual QSO (contact), in which two stations were discussing German radio receivers of the Second World War period.  Go to the Codes page to see full definitions of all the Q-Codes.


This is CW (Morse), recorded during a contest.  Go to the Codes page to get information on the Morse Code.

NOAA Weather Satellite (MP3) (WAVE)

This is a small part of a NOAA 15 weather satellite transmission recorded on 137.5MHz.  These satellites can be received for up to about 20 minutes during "overhead" passes but for much shorter periods when the orbit is near the radio horizon.  This sample is part of a transmission which lasted about 14 minutes.  The American NOAA and Russian Meteor weather satellites are located in low earth orbit (LEO).  Examples of weather satellite images resulting from decoding these audio signals are located in the Picture Gallery.

Watch this space!!  Under Construction   More to come soon.

Press an appropriate button on the left to go to another section of this site.

If there are no buttons on the left, you probably got directly to this page via a search engine.  Select normal access to go to the G3NPF/M1AIM home page.