Hello Ed,
The measurement don't need to be done with extender card. Just remove
the top cover of the 8350B and the top alu plate of the 83592 plugin.
The measurements I made are on the header pins accessible on top of the
last 3 cards, A6, A7 and A8.
I need an extender card to do measurements at the component level on the
boards.
I removed the 3 transistors that had already flux around from a previous
owner on the A6 Sweep Control board, Q1, Q3 and Q7 and used a transistor
curve tracer and 2 are matched nicely and 1 almost the same as the other 2.
I will check A8 YO Driver card to see if there is anything obvious.
Thanks,
Razvan
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On 07/01/2024 19:58, Ed Marciniak via groups.io wrote:
If you¡¯re seeing 7.2+ GHz on the aux output that would suggest that the
YIG oscillator is working.
I¡¯d look hard at the schematics and see if the input to the YIG driver
is forcing it to maximum frequency. If normal input range is seen, then
perhaps your YIG driver has a failed transistor. If the Input is
abnormal and stuck commanding a high frequency output then look upstream
to see why it is not sweeping.
I don¡¯t have an extender, so taking internal measurements on my 83595C
wouldn¡¯t be easy. There are differences, mostly in that mine has the
idlers for difference frequency to provide the low frequency output. The
topology is similar, and the YIG driver board would probably be the same.
_._,_._,_
