Do you know why screenshot shows spurious signals in 7GHz-9GHz range, not a harmonic of the YTO? You can set 8560 to zero-span at 1.3GHz to isolated the problematic frequency.?
Any spurs at N*3.6GHz +/- 0.3107GHz strong enough to pass through low pass filter FL2 will show up as signal at the IF frequency.
I just realized this is a 8560A, I have a 8560E (also changed YTO with a different type and adjusted coil current), I will check if frequency plan is the same.
Ozan
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On Sat, Jan 13, 2024 at 05:04 AM, <phil.morelli.pm@...> wrote:
Thanks Ozan,
As it turns out harmonic distortion isn't good (about 20dB worst case), but it gets much better at LO of 5.2GHz.
All filters are in place and all cables are tight.
More pics
It may be a case of pulling it apart again, and tinkering, playing around till something gets better or worse, and trying to make some sense of the results, and then coming up with a solution.
or
Leave it as is.
