Re: 8350B w/83590A repair advice
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I would suspect the YTO. I have seen several fail over the years...... The YTO output at the rear side is a good starting point..... Good luck, 73? de
Harke
On Saturday, December 14, 2019, 03:54:24 PM GMT+1, jfphp via Groups.Io <jfphp@...> wrote:
There is no YTF in the A and B models : only in the C On Saturday, December 14, 2019, 3:42:47 PM GMT+1, <pa0jme1952@...> wrote:
I took a look at the blockdiagram of my 83592, which differs only with an extra low band mixer,
The sweeper unit is a cascade of
a) YTO o/p 2.4-7.0GHz
b) amplifier
c) isolator
d) YTM (multiplier)
e) YTF
The most probable cause imho is tracking of the 3 YIG devices, at least that's my experience with the older 86290B which showed the same symptoms.
The tracking is done by opamp controlled current sources and can be caused by resistor ageing
Unfortunately I gave a few years ago my 83590 manuals away?
Best regards Rien
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