The analyzer input is not responding to the input signals and the calibration procedure generates the "REF Signal not found" alarm.
I noticed that the YIG is not generating any RF signal on the SMA connector ....
The 5V and 15V supply voltages are present, but I am suspecting about some points regarding the maincoil control signal.
Pin1 = -15v
pin2 = gnd
pin3 = gnd
pin4 = + 5v
pin5 = maincoil + = + 14.8v
pin6 = maincoil- = + 10.3v
pin7 = gnd
pin8 = + 14.8v
pin9 = FM-signal = 0.04v
pin10 = FM + signal = 0.04v
I also mesured the main coil current at these conditions:
(zero span and center frequency at 1 Mhz) - 72mA
(zero span and center frequency at 2.9Ghz) - 153mA
With this information I believe I can conclude that YIG is faulty, but my question is about the driver card ?
Could someone help me with the information if is correct for the main coil control current change only from 72mA to 153mA to cover the full range from 3Ghz to 6.8Ghz of this YIG ?