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| HP8648C Repair Output way low above 1001MHz |
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| scopeman:
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 W3OHM |
| TheDefpom:
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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