Makes sense to me.?
The birdie at 7.2 is due to 5*4.8mhz = 2*12mhz ?The crystal filter is between the VFO and the BFO so those harmonics should never meet if we have proper shielding. ?Coax on the VFO is part of proper shielding.?
Of course changing drive level will adust the strength of the various VFO harmonics and will also have an effect.
Will be interesting to see how bad that birdie is when we use the Si5351 CLK0 for the BFO, as there will be some crosstalk within the Si5351. ?We do have the option of moving the VFO to 19.2mhz, reducing the birdies but using the not-so-steep skirt of the filter
On Mon, Apr 10, 2017 at 09:15 am, Allard PE1NWL wrote:
So then I guess it must have been the RG-174 coax (and the cable
arrangement perhaps) that made the difference.
?
