Hi Greg,
Your recommendation of looking at first mixer output is still valid. Rik's SA is off by 30-40dB, few dB error in expected levels won't change debug approach. Block diagrams take some time to decipher, I spent quite some time on 8594E (tracking generator fix) and 8560E (YIG retrofit) block diagrams before.?
Ozan
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On Mon, Feb 27, 2023 at 10:18 AM, Greg Muir wrote:
Ozan,
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Boy, did I make a big fluff!!? Your recent comment regarding the erroneous IF frequency in my last post brought me to take another look at the stage gains/levels that I had mentioned in that post.? From that I realized that I had pulled up the wrong documentation that was for the 8590 instead of the 8594 analyzer.? The last section containing this information in that email should be disregarded.
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The HP ¡°Service Guide - HP 8590 Series Analyzers Assembly-Level Repair¡± document (08590-90300) appears to contain all of the necessary level/frequency information shown in the block diagram (foldout 9-4) to be able to further diagnose the problem.? As Rik had commented it can be a little daunting to try to decipher the information across various analyzer models but with careful attention across each stage it can be a great help if one simply uses a highlighter marker to indicate the information that only applies to the 8594E unit.
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My apologies for any misleading information.? I was dealing with too many tasks at the time.
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Greg
