Homebrew Spectrum Analyzer

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Does anyone recognize these?

These are mixers I believe. Probably equivalent to the 10514A series but as a plug in brick instead of with BNC connectors. Apparently the 10514A is good from 200KHz to 500MHz.

I would at least like to know what the R X and L designations mean as far as LO, RF, and IF would be used.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.
 
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This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.