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Switching the input coupling to GND makes no difference as far as I can tell. Also, does anybody have any recommendations for mosfets to use for a replacement circuit? or important specs at least.

Just made a few calls to Keysight and 1460-1311 grounding clip is definitely not orderable. I have the dimensions of the clip so I will try and manufacture a clip out of BeCu sheet metal. Thanks,

Hi everyone and sorry for the OT, but this group has the best chances to help in this case. Does anyone happen to have the Leader LVG-1600 manual? Even only the user manual would greatly help. Thanks

Ok Yves, makes sense now. My figures are a bit different, but looks ok overall. Thanks for your helpful data again.

Regardless it is best practice to keep cable lengths at a minimum, DB25 cables retail from $5 to $20 depending on make and length so its not cost prohibitive to aquire a short cable

Thanks - Excellent, now he can test his cable. Cheers! Bruce Quoting Lothar baier <Lothar@...>:

Pin 4 Pin 10 Pin 11 Pin 17 Wired straight through ! I am using a DB25 cable from Amazon 3ft works flawless Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows Sent: Wednesday,

If you know the cable connections please POST it to the board. That way, he can check his cable and "fix" it if necessary. BTW - IS the cable straight through? If so, which conductors are needed?

I bought mine on ebay for $800 , spend quite a bit of time trying to figure out the cable Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows Sent: Wednesday, March 2, 2022 7:13

Seems like the wrong wearing due to a cross over or some other "defect" could cause intermittent operation. How about using a break out box to look at the signals. I've never owned an 8516 (owned most

In case anyone is interested, there is some amazing new technology that came out using some interesting magnetic materials that automatically filters out any frequencies above a certain threshold

There is no schematic for the 8516 only a few block diagrams , the switching isn’t done by relays but rather with pin diodes inside the brick , the doubler control board is buttoned up on the

Sure but it is comparatively slow - Normal 8510C sweep is relatively slow, and the problem can be avoided by only weeping 50-20 and say 25-40GHz. I think the best first step is to look at the doubler

Disagree with you on this, dont forget that the synthesizer is swept so if you do a 45MHz to 40GHz sweep the doubler is switched in and out constantly so your DC now becomes a squarewave , also the

Missed that - the 20 ft cable seems NOT likely to be a problem - these ar DC control signals. I recall some discussion that it is a straight through cable without cross over based on looking at 8341

He mentioned earlier in this thread that its only 20-40GHz but he also mentioned using a 20ft cable ? which could be the problem, I am not sure what the control interface is , the part number of

Thanks!

Great responses, thanks!

Does the IF error occur below 20 GHz ?? If not, the doubler is suspect - if so, look at the switching or the test set. Nexg step would be to try and look at the test set VTO. It is difficult because

Good pojnt and actually one that is often not considered , spectrum analyzers ARE wideband and as a result signals that fall within the bandwidth of anything before the mixer WILL affect the mixer