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
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