[Elecraft] K3 drive level for Q5 Signal 432 Transverter

[Ed Cole]

Tried what you suggested Gary.  No joy.  The upper limit with the PWR 
knob remains at 0.8MW.  I can adjust downward but not upward.  Need to 
get a good power meter on it and see what the actual output is.  And, 
I?ll try the low-level power calibration process and see what happens.

Thanks again.

Any others have any suggestions?

David, NS4V

For accurate measurement of power at 1mw, the HP-432A Power Meter is 
excellent.  But probably Tried what you suggested Gary.  No joy.  The 
upper limit with the PWR knob remains at 0.8MW.  I can adjust downward 
but not upward.  Need to get a good power meter on it and see what the 
actual output is.  And, I?ll try the low-level power calibration process 
and see what happens.

Thanks again.

Any others have any suggestions?

David, NS4V
--------------------------
For measuring mw level RF, the HP-432A Microwave Power Meter is 
excellent and reads up to 10-GHz, which probably not needed by most who 
read this reflector.  They sell used at about $150, but the power sensor 
and cord are hardest to find.

For most reading RF voltage across a 50-ohm dummy load with an 
oscilloscope is good.  Read the peak voltage and calculate the rms 
voltage.  Vrms = 0.7071*Vpk.  Power = Vrms^2/50.  Scope needs to be 
rated for the frequency being measured.

One other note: I have found my K3 will drop power if the load is not 
low SWR.  Could the input impedance of the Q5 not be 50-ohms?

I assume the input is similar to the DEMI 432 transverter with a choice 
of high power (up to 10w) or low power (down to -20mw).  There is a 
mini-pot for adjusting Tx drive on the pcb.  The Q5 manual should have 
installation and tune-up instructions that mention input power 
requirements and drive adjustment.

Probably a call to Elecraft Service might help.

73, ED - KL7UW