On Mon,10/26/2015 8:48 AM, Rich wrote:
My K3 shows 13.7VDC on RX. When I TX that reading drops to 10.9VDC. Is that a normal drop?
It's not good. Two possible reasons -- poor regulation of the power supply and IR drop in the power cable.
How long is the power cable between the K3 and power supply? What wire gauge? Do the arithmetic for Ohm's law for the IR drop in that length of that wire gauge. and remember to use the length of the cable x2 (for two conductors). Resistance per ft for various wire gauges is in the ARRL Handbook.
Put a voltmeter across the output terminals of the power supply and check the voltage. It's also possible that the power supply has poor regulation.
73, Jim K9YC ______________________________________________________________ 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
