[Elecraft] K3/100 power supply

[Matt Zilmer]

Set it under TX full power load at the K3 APP terminals, measured
using an external voltmeter known to be accurate.  Just probe into the
APP backshells with the DVM probes.

I use 14.2 at full load.  RX voltage is then 14.5V.  This provides
some margin for the power supply going bat$#!+.  The situation here,
though, is safer than most because it's solar-powered going through a
separate charge controller into a battery.  The battery feeds the K3
through a TGE boost regulator.

Recommend the TGE regulator for K3 ops.  It is extremely robust.

matt W6NIA
K3 #24

==

On Sat, 16 Apr 2011 22:40:47 -0500, you wrote:

>So...If I were to tweak the power supply voltage should I use the K3 
>internal voltmeter or an external one?  If an external one, I assume 
>connected at the DC input to the K3 to compensate for any voltage drop.
>
>Also, should I set the voltage under load/while transmitting?  I guess 
>that would depend on how good the voltage regulation is?
>
>On 4/12/2011 10:02 AM, Bill W4ZV wrote:
>> VK5ABQ wrote:
>>> 1. The LCL300PS12 can provide 25A and has an adjustable output range of
>>> 11.0 to 13.0V. Is this suitable for the K3/100? XP Power’s 12.5 to 14.5V
>>> model isn’t available here.
>>>
>> If you operate SSB at full power, I'd recommend at least 13.8V and
>> preferably higher.  The K3 is specified up to 15V and exhibits better TX IMD
>> performance at higher voltages.  I set my Astron RS-35M for 14.5V at the K3
>> terminals.
>>
>> 73,  Bill
>>
>>
>> --
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