Dear reader,
I have a 11664A detector that reads 3-4 dB low on my HP 8756A sna. As
flatness (10 MHz-18 GHz) is not the problem, I suspect the amplifier
succeeding the diode assembly. The sna is ok. The detector has two
adjustment pots inside which I tried. It only gives about 1 dB
improvement. Additionally, I measured the bias of the "final amp" to
be about 0.7V higher than expected. Everything else, as far as I can
see without correct schematics, measures fine. I found schematics of
the older, black version, without adjustment pots (tnx Agilent). Does
one of you have a pdf available of the newer version that I have?
That would be most helpful. Any other advise as well of course.
Also I'd like to connect a Narda diode detector and a Wiltron vswr
bridge to my sna. For that purpose I'd want to make a copy of the
11664C myself. This can be easily done but for that purpose I'd like
to have a decent housing. If you have a defunct 11664A/B/C or just
the case with attached cable assembly in your junkbox that you do not
need, please contact me off list.
Thanks in advance,
Harke, PA0HRK
