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
I assume that the 400kHz originates from the power supply, so probably some electrolytic capacitors have to be changed. When I check with a small probe there is a lot of 400kHz in the power supply.
This is a picture with the increased noise level. Compare with the normal displayed noise below. The displayed "band" of noise is about 2 squares in the normal but all the way down in the faulty. Any ideas what this could be?
Regards Jens