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Okay, here's some stuff to nudge us back on topic... One of the two boards I bought from sz.plaza.com had a defective regulator, and I cooked the OCXO before I realized the problem. So I decapitated

Dave Wright <davewrightsplace@...> added folder */A temporary directory for photographs and help relating to emails and posting/CTI_OCXO internal photos*

On straightening the traces, I wonder if rotating the parts (and 45 degrees is legal) would help.? Don't think that power leads are as critical.? IIRC, the bends might cause impedance changes and

I got a bunch of stuff from an old moldy garage for US$50 a box and this HP 3490A shows all number 2 on the display. It looks (to me) to be in pretty rough shape externally, and great shape

Straight signal line, 2 layer, (transistors.....), bottom ground plane stitched to top ground pour. Yep, looks reasonable to me. Harvey

Hej Klaus det er desv?rre ikke s? let. Du kan kun k?re med intern source. Og der er 2 slags YIG i de apparater. 5086-7473 eller 5086-7934. De g?r begge i stykker. Du kan god f? den repareret men

Hi I have an HP8753 network analyzer I bought at an auction. When powered up, it shows the error: " CAUTION: NO IF FOUND: CHECK R INPUT LEVEL" Seems the 8753ES has a known problem with YIG

Hi I recently bought a? EMI test receiver HP 85422E at an auction. I have tested it, directing a single frequency into the RF input. The gain is spot on, at most 0.5dB off. But the frequency is

Hi all, I'm on the hunt for a verified working 8482A power sensor, shipped to Japan. If you can provide a few pictures of it in operation and are willing to sell it for a reasonable price, I'm

Here's some pictures of the original HP board that I found online: HP 53132-60003 PCB Top ( https://drive.google.com/file/d/1J42heNdRPS1HLB-nYkH_spUI71Q6yCM0/view?usp=drivesdk ) HP 53132-60003 PCB

It's pretty straight forward. https://ibis.org/touchstone_ver2.0/touchstone_ver2_0.pdf I take the four real/imaginary S-parameter data pairs, using the Smith plot data retrieved by HPIB and write the

Good point Tom. The schematics don't necessarily indicate the fine details of circuit structure (especially at HF) and operation. I guess there is no picture of the original HP board layout? If one is

I don't know what HP's original layout looks like, but here's one possibility for the doubled-up diode clamps: Note that they're not directly in parallel -- they're separated by other stuff. If that

Jared, as I recall, the modern replacement diodes you're using are quite a bit more stout than the originals HP used. The only reasons I can picture for the doubled-up ones by HP is first, at the

Hello again Group - I have an 8720C and would like to be able to extract s2p files. I do have a PC with GPIB, and also I have a plotter emulator which works great. But I need a way to extract the data

The diodes are there because that's what HP did. I would also like to know the exact reason they did that too. :) It seems to work, so I'm sure there's a good reason for that layout. The Coplanar

I use the cal kit manager to create the XML version of the cal kit. In my ' HP8753 Companion ( https://github.com/VK2BEA/HP8753-Companion/tree/main ) ' program for the 8753 I parse the XML and use the

wrote: My understanding is that it only works with NI or Agilent GPIB cards, but I have not verified that.

Hi all, I have just stumbled across the VNA cal kit manager software here on this

Why two sets of diodes before the prescaler? I would think that two diodes after the resistor should be enough. The pair after the amplifier have no limiting. Also agree with the comment about