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Re: Si5351 VFO - Low Pass?

Baruch Atta
 

I thought that a pure sine wave was best. Isn't a square wave a mix of waves?? That would result in all sorts birdies and products?


On Jan 4, 2017 10:28 PM, "Ken Chase chase8043@... [BITX20]" <BITX20@...> wrote:
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And I am using the Adafruit SI5351.

73 Ken

On Wed, Jan 4, 2017 at 10:26 PM, Joel Caulkins caulktel@... [BITX20] <BITX20@...> wrote:
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Jerry,

Im using the Etherkit Si5351 breakout board.?

Joel KB6QVI

On Jan 4, 2017, at 7:08 PM, jgaffke@... [BITX20] <BITX20@...> wrote:

?

I'm no RF guru, but had thought?a diode ring mixer would be fine with a square wave LO.
Would be interesting to hack the analog VFO to give a square wave at the same amplitude as the Si5351, see if that has similar rx noise.? Might be other things going on here, like uC hash or a poor board layout.
Curious how the softrock guys found it necessary to have galvanic isolation for their Si570.

I assume nobody in the field yet has a Raduino equipped Bitx40 to experiment with.
What Si5351 board are you using?

Jerry, KE7ER

On Wed, Jan 4, 2017 at 8:26 PM, Joel Caulkins caulktel@...? wrote:?
?Mine was noisier too until I put a LPF inline with the Si5351.?
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