[Elecraft] K3 going expeditionary

[George Thornton]

Concur.  

The K3 can in my experience be vulnerable to voltage drop which can happen with a questionable power source.  

For a rig like the K3 you should draw straight from the battery.  You can add some additional protection in a mobile setup by incorporating a voltage regulator In the circuit just before the K3.

-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of Ed K1EP
Sent: Sunday, August 23, 2020 11:32 AM
To: Ted Edwards W3TB <w3tb.ted at gmail.com>
Cc: Elecraft Reflector <elecraft at mailman.qth.net>
Subject: Re: [Elecraft] K3 going expeditionary

You could do that. I wouldn't advise it for other reasons. Why don't you measure the current at different power levels when on a power supply? There is a current display on the radio. The cigarette plug is not directly connected to the battery. There is likely to be poor connections resulting in IR losses and other problems.

On Sun, Aug 23, 2020, 14:22 Ted Edwards W3TB <w3tb.ted at gmail.com> wrote:

> I am planning to put my K3 in the car for the upcoming Tennessee QSO 
> Party so that I can go rover/expeditionary.
>
> With that comes a question:  Powering from that accessory socket which 
> appears limited to 15 amps instead of the 20 amps that the K3 wants at 
> full power, do I understand right that reducing to 50 watts output and 
> taking the -3dB will work out in terms of power draw?
>
> In the past, I have done QRP and would like to be a bit louder this time.
> Thanks to all who might respond.
>
> --
> 73 de Ted Edwards, W3TB and GØPWW
>
> and thinking about operating CW:
> "Do today what others won't,
> so you can do tomorrow what others can't."
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