[Elecraft] K3 drive level for Q5 Signal 432 Transverter

[D Remy]

Thanks Ed!  Don’t know how this chain got so scrambled.  I’ll run it be Elecraft too!

73, David, NS4V


David R. Hourdequin, PE
Specialty Heavy Timber Engineer
Hayesville, NC 28904
828-421-6216

> On Mar 2, 2022, at 02:03, Ed Cole <kl7uw at acsalaska.net> wrote:
> 
> 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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