Greetings All Here are my basic conditions: - KiwiSDR (~DC-to-30MHz) or - Apache-Labs 7000dle - Dell laptop computer - Both on battery power
I have cleaned up my system using chokes and filtering to the point there are virtually no CM-signals entering the receiver when the feedline at the antenna is disconnected and re-connected to a 50-ohm load. When the antenna is reconnected I see desired signals PLUS an unwanted comb-line with signals every ~98.4KHz (e.g. comb-lines span 2573.49KHz to 4355.38KHz resulting in 98.438KHz line spacings.) These signals are frequency stable and not drifty. Shutting down the house-mains with the receiver battery powered does not kill the QRM. SO, it looks like something somewhere is generating this junk that runs from the BC-band to >20MHz. Have any of you encountered similar ~98.xxxKHz spurious signals ? 73 Dick/w7wkr at CN97uj _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
