So the challenge you run into when building replacement modules ( and I am entertaining the idea right now for the power amplifier MIC in the 8753 sources ) is that first of most microwave circuits use ceramic and are wire bonded , although substrates exist that offer similar dielectric properties than Al2O3 wire bonding on those substrates is not trivial !
The bigger challenge though is to figure out the specs of the original module , I been thinking about using a bad 8753 source and rigging it up with some test points to measure power and DC voltages going into the power amp and the loss from output to the step attenuator but right now I haven¡¯t found the motivation yet
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[email protected]Subject: Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns!
On 3/18/22 22:19, Lothar baier wrote:
If you do edge coupled microstrip filters or directional couplers than
the accuracy of the gaps is very important but another aspect that has
to be considered is the roughness of the edges
Yes. There's a great deal of activity in building replacement boards and modules for instruments like ours (trying to bring this further on-topic), so if the results there are adequate, this does open up some possibilities. One thing that causes trouble with the more affordable board houses is that sometimes they change substrate compositions, so the published dielectric constant isn't always something you can count on.
-Dave
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Dave McGuire, AK4HZ
New Kensington, PA
