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: | Sun, 27 Mar 2016 21:04:30 +0100 |
Cc: | [email protected] |
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If you are referring to the close spaced lines making up the spectrum of the two strong signals, from teh plot you show they appear to be about 1.5Hz spacing. This is the WSPR symbol rate (actually 1.465Hz) so the lines visible are the natural sidebands from the WSPR waveform.
I'd be surprised if an DDS itself were generating 100Hz sidebands on its own. Especially a more modern one like the AD9859. Even the venerable AD9850 doesn't generate stuff only 40dB down. So I'd still look for other means of 100Hz leakage. Perhaps getting onto the reference source. I assume the two stations both reporting 100Hz sidebands are using identical generating hardware ? I use an AD9852 for WSPR and generationg MFSK modes generally, a device perhaps bit a bit older than the AD9859, but the same family, and it is certainly clean down to at least -60dBc. When driven from a higher clock frequency, better still. Andy G4JNT On 27 March 2016 at 19:47, 'Clemens Paul' [email protected] [rsgb_lf_group] <[email protected]> wrote:
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