To: | [email protected] |
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Subject: | Re: [rsgb_lf_group] RE: Cheap and nasty sources - was LF: DK7FC WSPR bad quality problem |
From: | Andy Talbot <[email protected]> |
Date: | Tue, 29 Mar 2016 17:25:54 +0100 |
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Completely predictable. It how you write the code. I have all the WSJT modes running from PICs, driving a variety of different frequency sources. All timing is derived from a timer interrupt, which for most of the modes is the 10Mhz crystal divided by 4096 = Sending prestored messages for beacon use (symbols calculated off lin with a separate utility then stored in the PIC) JT4 for AD9850/51 and AD985 DDS chips and LMX2541 Fract-N synth JT65 for ditto WSPR for AD9852 ISCAT for LMX2541 JT9 for AD9852 (new) PSK31 for AD9852 (that DDS has 12 bit programmable amplitude) And now, real time modes where the symbols are generated in the PIC code and message data is input to it: Real time JT4 transmitting compressed lat/long (See RadCom Plus recently) JT4 from LMX2541 and now, as of two days ago, real time JT9 from AD9850/51 None of these are plug-n-play. You need to assemble and adapt your own PIC code, but the source code is all on my website for anyone to use - although there will be a bit of a delay before the JT9 stuff appears there Andy G4JNT On 29 March 2016 at 13:54, Graham <[email protected]> wrote:
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