What marker frequency do you get on the 0dBm signal?
It sounds like you are looking at the LO feed through signal, if so the marker on peak signal will be 0 MHz @ 0 dBm.
What do you see if you do an instrument preset (green button)?
At turn on, what is the start frequency? What is the stop frequency? With cal signal connected, can you run the self cal procedure? What happens when you narrow the span to 100, 10, 5.01, 5.00, 1 MHz, and 100KHz? Do it with the phantom signal, then with the cal signal. Cal signal 300 MHz @ -10 dBm
Please report back your findings.
Don Bitters
