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HP8563 show sidebands on CW and high noise level

Question asked by sm7ovk on Feb 6, 2020
Latest reply on Apr 7, 2020 by noiseguy

Haven't been very active for some time. When I now started my old HP-8563E it shows two faults;

1. when I connect any CW-signal I get sidebands about 400-450kHz on each side of the carrier. These are shown about 53dB below the carrier and are on all CW-signals. (Not when I look with another analyzer.)

2. Noise level seems very high. I get a broad band of noise with the analyzer after reset and there isn't any dark part of the screen below the "noise band".

No errors recoreded.

Any ideas?


Regards 73 Jens, SM7OVK