Thanks to all. I have check my PS and it does not fluctuate even a
tenth of a volt on TX. With the radio connected directly to the PS.
I am now seeing 14.1 VDC and 12.0 VDC on TX. So I need to look closer
at the wire gauge and connectors. That is still about 2VDC drop.
Thanks for the help
rich
On 10/26/2015 12:09 PM, Phil Wheeler wrote:
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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