On Thu, Mar 25, 2021 at 05:31 PM, VE7PS wrote:

...as WB6OGD has come up with an el-cheapo modern equivalent of the Drake FS-4 frequency synthesizer that you can build easily for about $30.?

As Peter says, no need for xtals anymore, The SPR-4 would be great to have..wish I could find a cheap one!?
And, I have the FS-4 cost down to more like $11 now,? hi hi.

I think we could even add passband tuning... the Si5351 synthesizer we use actually has 3 outputs and we are only using one for the band crystal
frequency.? Another could replace the BFO and with some Arduino code, we could vary both, one up and the other down...? PASSBAND TUNING!
And, by counting the PTO frequency and coding, we could send an Injection signal to the T-4X without need for the Drake transceive adapter.

73,
Gary
WB6OGD