HP-Agilent-Keysight-equipment@groups.io

Tom Dawson All Messages By This Member #91 Synthesizer lock on all frequencies but has about a 10 KHz FM signal on most frequencies. Using a scope on the output pins of the Phase detector chip shows the expected pulses but about a ten KHz amplitude modulation on the pins. Powwersupply looks clean. Chip jhas been replaced. Anyone seen this before? 73 Tom WB3AKD
John Miles #92 How about the PD's reference and VCO inputs? My bet's on the YIG or tuning driver circuit, or one of the supplies associated with them. -- john KE5FX toggle quoted message Show quoted text Synthesizer lock on all frequencies but has about a 10 KHz FM signal on most frequencies. Using a scope on the output pins of the Phase detector chip shows the expected pulses but about a ten KHz amplitude modulation on the pins. Powwersupply looks clean. Chip jhas been replaced. Anyone seen this before?

开云体育