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CHELMSFORD CALLING  

WORLD SERVICE

Data Message Decoding - Programme No. 2

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Thank you for taking part in our data decoding experiment. Our 50 second data message is in PSK-31 form, & is relatively easy to decode if you follow the guide below...

 

You may already be familiar with data signals & decoding, but if you are new to this we suggest you use the Essex Ham decoder which is available as a free download - click on the box below to go to the Essex Ham website page where you can read how to use the decoder & download the EssexPSK Application...  

 

 

 

 

 

 

 

 

 

 

 

Let us know how you get on & how you have received us - whether online or off-air.

 

 

PS - now you have decoded our message - why not carry on decoding ? - If you click on the 'Show Frequencies' box of the Essex Ham decoder you will see a list of HF frequencies used for PSK & RTTY amateur radio transmissions. We suggest you choose PSK-31 in the mode box & then enable your computer to hear the output from your receiver - normally placing an external microphone next to the receiver is sufficient - & click on one of the received streams. You will then see decoded text appear... Note - reception should be in USB - upper sideband mode.

 

Don't have an HF receiver ? - you can still use one of the tuneable online receivers. We often use the radio receiver at the University of Twente in the Netherlands to listen to the HF bands - click below...  

 

 

 

 

 

 

 

With our grateful thanks to Pete M0PSX & Charlie M0PZT for use of the Essex Ham decoder.    

 

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To use the decoder with our data message, you will need to enable your computer to hear the 50 second message either from the off-air recording you have made or by listening again to our online mixcloud programme player (available on the World Service main page). If your recording is on a separate device, an external microphone connected to the computer is normally sufficient to feed to the decoder. You will see a vertical 'stream' appear in the blue 'waterfall' - click on the stream which will move the triangular cursor to the stream line. Hopefully - text will then appear in the box below !  

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