Re: Crystal CW filter with Version 4 uBITX boards? #ubitx
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The diplexer would have been required of we were concerned with mixer spurs. However the 45 mhz filter narrows the signals reaching the filter. So, mixer troubles by way of spurs are not a major concern.
The second filter frequency should not be harmonically related to 12 mhz. 4.195 mhz is a good choice. I have tried that and it worked very well.
I will make another build and post the details.
On 8 Jul 2018 9:34 am, "Jerry Gaffke via Groups.Io" <email@example.com> wrote:
Exactly how do the transformers ruin this?