Hi Ed, WB2UAQ ---
Thank you both for quick and helpful replies!
Ed - with your suggestion, I remembered that I do have a 11707A and it is now in the unit (I've never used it before as I've not had a 8660 failure, and I don't believe I've ever heard of a 11707A manual).
I also remembered that I have a 08660-90070 8660A/B/C service manual, which makes use of the 11707A test plug-in (an
online search for 11707A pointed me to that manual which makes use of it.)
Using the 08660-90070 manual, I am beginning tests:
The power supply voltage measurements on page first requiring those tests all show within spec.
The 350-450 MHz output is a couple of db below minimum spec (measured using 436A/8484A with 40 dB inline attenuator); all of the other RF level test points on the 11707A are above minimum spec.
I am now recharging TinySA Ultra (covers to 800 MHz) so I can look at the signal quality.
Thanks again, I'll update once I have any more specific results.
Dave
