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 <[email protected]> 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 > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
