Yep I’m familiar with that formula. One of the tests in the assembly instructions was to test the current draw at 100w. It was 13A. The acceptable range was 13-18A so I thought that was a good result.
Thanks, Mike NJ2OM > On Jun 30, 2020, at 11:20 PM, Nr4c <n...@widomaker.com> wrote: > > Watts is Volts X Amps. > Fewer Volts means more Amps. More Amps means more work for power supply, > leading to fewer Volts. Fewer Volts means ...( you get the picture). > > Sent from my iPhone > ...nr4c. bill > > >> On Jun 30, 2020, at 8:37 PM, Mike Kopacki <mikekopa...@gmail.com> wrote: >> >> I didn’t have ring connectors big enough but I did have spade connectors. I >> crimped and soldered them but there was no change in the voltage readings >> during receive and transmit. >> >> Is it possible that the power supply is failing? >> >> Why, if the voltage drops during transmit to 11.6V, does the radio still put >> out 100W on 30, 40 and 80 meters? >> >> Thanks, >> Mike NJ2OM >> >>>> On Jun 30, 2020, at 6:55 PM, Don Wilhelm <donw...@embarqmail.com> wrote: >>> >>> Mike, >>> >>> The red and black assembly is an Anderson Power Pole connector - commonly >>> called APP. >>> >>> For the small receive current drawn, the voltage drop in the wire and >>> connectors should be close to zero, so the 0.2 volts is significant for #12 >>> wire unless there is something not properly tightened on the connectors. >>> The drop will be more substantial with the increased current during >>> transmit at 100 watts. >>> >>> Banana plugs and jacks can be used to carry a heavy current, but some of >>> the ones I have seen have a poor contact method of fastening the wire to >>> the banana plugs - properly installed wires on banana plugs are good for up >>> to 30 to 50 amps. Is there any way you can connect ring terminals onto >>> those power supply terminals? Like removing the outer nuts from the >>> terminals - if so then switch to the ring terminals. >>> >>> 73, >>> Don W3FPR >>> >>>>> On 6/30/2020 6:21 PM, Mike Kopacki wrote: >>>> >>>> Don, don’t know what you mean by the APP assembly. >>>> >>>> I can only see one metal part on the inside of the red and black >>>> connectors that plug into the K2. I assume that is the “contact blade”? >>>> I see nothing else on the inside. >>>> >>>> But here is a possible problem, that I will throw out, knowing full well >>>> that some will think I am not very smart…..I had to buy banana plugs to >>>> make the power cable, which is part of the KPA-100 assembly instructions. >>>> When I received them from MFJ, model MFJ-7713, it was a solderless type >>>> that I had never seen before. I talked to three people at MFJ, none could >>>> explain how the wire attached to the plug. The third guy hung up on me. >>>> >>>> So I connected the wire to the plug the only way I could see, but the >>>> configuration of the plug still eludes me. >>>> >>>> The P/S output is 13.6V. I’m seeing 13.1V at the K2. If the normal drop >>>> is .3V, it should read 13.3V at t ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
