HP 4195A network /spectrum analyer

[ppppenguin]

If fitted the the pair of AAA cells, a bit fiddly but no problems. The 4195A now boots OK and seems to work on everything I've tried. I'm sure that calibration is adrift in all sorts of ways but I doubt it will matter for the jobs I use it for. When doing 2 port transmission measurements you always calibrate against your test cables to zero them out. For 1 port return loss measurements you always calibrate against at least an open circuit and a 75R termination.