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| To: | [email protected] |
|---|---|
| Subject: | Re: LF: 500kHz 1mW WSPR beaconing |
| From: | Richard Newstead <[email protected]> |
| Date: | Mon, 26 Oct 2009 19:14:30 +0000 |
| In-reply-to: | <[email protected]> |
| References: | <[email protected]> <14E9228C113E44A6A66C5DEF8A144F28@AGB> <[email protected]> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
| User-agent: | Thunderbird 2.0.0.23 (Windows/20090812) |
Andy Talbot wrote: ---There is no 'chance' involved. The strong source coding employed in all the WSJT modes to get the number of bits to be encoded down to an absolute minimum, before proper error correction is added, removes all wasted redundancy in the original callsign format. This has the result that most _truly random_ bit patterns will therefore generate a valid looking callsign. Its an artefact of efficient coding. AndyThanks for the explanation. It is interesting to see WSPR decoding things such as CQ and a plausible looking callsign and today mine has a message "de 9y4/mk0whx rrr". All these on 500kHz. I notice that your beacon is detectable all day here. 73 Richard G3CWI |
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