If the wire gauge is OK and the supply regulation
is not at fault, give some attention to the
connectors at each end of the cable, too. A drop
of 2.8 Volts points to some sort of issue.
73, Phil W7OX
On 10/26/15 9:02 AM, Jim Brown wrote:
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
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