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HP8648C Repair Output way low above 1001MHz
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Topic: HP8648C Repair Output way low above 1001MHz (Read 536 times)
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scopeman
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HP8648C Repair Output way low above 1001MHz
«
on:
October 05, 2022, 12:00:48 am »
Well it seems that my 8648C has stopped working above 1001MHz. Above that frequency the output drops by 9 to 14dBm with reference to 0dBm 1mW.
Has anyone seen that issue before I pop the covers on it. From 100KHz to 1001MHz it is absolutely spot on so I think the problem might be in a frequency multiplier string somewhere. Having only block diagrams won't make this easy. This particular generator has option 1EA which is the 100mW power output option.
Thank for looking!
Sam
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TheDefpom
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YouTuber Nerd - I Fix Stuff
Re: HP8648C Repair Output way low above 1001MHz
«
Reply #1 on:
October 06, 2022, 08:38:35 am »
I’ve done some repair videos for it’s sister unit the B version, there are probably some pointers in there such as the sections to look at, FYI the 8920 uses very similar modules which has the CLIP info available online.
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Cheers Scott
Check out my Electronics Repair, Mailbag, or Review Videos at
https://www.youtube.com/TheDefpom
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