Re: Si5351 VFO - Low Pass?
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Joel when you say noisier, do mean sounds noisier or scope trace is noisier? I built the top filter and I didn't hear any difference. On the scope, the signal cleaned up good, but I could see some phase noise.
73
Ken VA3ABN
On Wed, Jan 4, 2017 at 8:26 PM, Joel Caulkins caulktel@... [BITX20] <BITX20@...> wrote:
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Andy,
Mine was noisier too until I put a LPF inline with the Si5351. I got the idea here. Scroll down the page a ways to find the filter table.
Joel KB6QVI
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I noticed that my receiver got noisier when I disconnected the built-in VFO and added the Si5351.? I get that a filter re-shapes the waveform, but I'm wondering about whether it's useful to clean the output signal a bit before injecting it into the radio.
I guess this is where the 'experiment' and 'learning' parts of the game happen. :)
Andy
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