[Elecraft] K3 Voltage on TX

[Rich]

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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