Now crank up the voltage output on the power supply to 14.1 Volts. This will result in a cleaner signal and lower the amp draw, thus reducing the cable voltage drop slightly (that Ohms Law thingy again).
Enjoy your rig. ps: I’ve replaced the circuit board in several Astron power supplies recently and they were all set to 14.1 Volts right from the factory. Sent from my iPhone ...nr4c. bill > On Feb 26, 2019, at 9:55 PM, mjpilgrim <mpilg...@bellsouth.net> wrote: > > yep, OHM's law lives, even after at least 61 years since i first studied it > in preparation for my novice test. > > Furthermore, I'm grateful for the outpouring of ideas and suggestions > received here on this forum. I think I have learned enough to convince > myself that I have improved my situation as much as i can, and with what > remains, I can live with the resultant which appears to be due to the > presence of the referenced internal diode which some have suggested would > impose a .7V voltage drop. > > From received suggestions I replaced the input power cable with a 8AWG 6' > stranded copper pair with all the power pole connectors firmly crimped to > the wires. When plugged into the MFJ switched power supply i measure 13.6V > at the power poles on the power supply, and the same 13.6 is measured at the > power input on the back of the K3. Under key down 100W CW test, the power > supply voltage does not vary at all, either at the power supply or on rear > of the K3, and on the internal power meter in the K3 I see a .8V drop to > 12.8V......... that's near enough to .7V to declare victory as far as I can > see. > > Having achieved what seems to be normal operations as based on those voltage > measurements, I then disabled the MFJ power supply and moved the input power > cable on the K3 over to the DC distribution panel from the Solar System > batteries. Much to my surprise and pleasure the voltage measurements > compared equally to what I registered in the hookup to the MFJ power source. > > So, now that you have helped put this power concern to rest for me, I will > close out this concern as I turn my full attention to fine-tuning my solar > power system capabilities, such as incorporating a boost inverter for > raising and holding the input voltage at a level more friendly to the K3 > operating efficiency. > > Thanks again for all your suggestions and ideas. > Regards, > Mike, K5MP > > > > > > -- > Sent from: http://elecraft.365791.n2.nabble.com/ > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
