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R266A -Spectrum analyzer ghosts (internal signals)

 

Hello members, I have an old R2660A (IDEN option) that I replaced all the 33uf electrolytics caps on Interface board ( each one had leaked). Luckily no major damage that didn't clean up. This fixed the alarming of the "excessive power to internal load alarm". I also replaced the memory battery as well. It goes through all calibrations successfully. Everything seams to be working ok except I'm seeing all kinds of internal signals in spectrum analyzer mode (no antenna connected). It does receive signals normally when connected to an antenna.
Does anyone know what might be causing this?
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More bad electrolytics on another board....or?
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I pull the spectrum card and receiver card and check the electrolytics on those and they were fine.
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It what quite a job replacing all those things too i must say...
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Thanks in advance
Randy
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Terminate the RF input with a dummy load when testing this. As to if it is normal, there are a lot of internal signal sources that could intrude. I would suggest checking all the shields, fasteners and connectors for tightness. If any shields or connectors are corroded be sure to clean up appropriately and use de-oxit.
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The Real RFI-EMI-GUY
 

Thanks for the reply. These signals are internal. All the boards are mounted in a giant metal card cage and are very well shielded. Not sure what else to check at this point.?
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