[Elecraft] KXPA100 on battery.

[Chip Stratton]

Jose -

The N8XJK boost regulators will do what you want with a few caveats.

First, they do introduce some conversion inefficiency themselves - they
will draw about 10% to 20% more power from the battery than will be
delivered to your radio. Just the nature of boost converters. This will put
quite a strain on your battery in any event. You won't get a full 22 amp
hours of use from it, i.e. I wouldn't expect much more than an hour of
operation at best before it became unusable, but until then everything
should work well..

Second, since it is a switching type power supply it may introduce birdies
on receive. Naturally this will be worse if near the antenna, or if there
isn't a choke on the coax going to the antenna. N8XJK does have a more
expensive converter that senses RF and only activates boost during
transmit, and takes the converter out of the line on receive. That should
take care of the birdie problem.

I have used one of their converters in a marine environment, and it worked
well. I haven't used one in portable ham operations.

Chip
AE5KA

On Wed, Feb 3, 2016 at 5:27 PM, Jose Rivera <n2lrb at n2lrb.com> wrote:

> I just purchased and put together a KXPA100 Amp. I want to use it at home
> with my power supply (same one
> Elecraft currently sells). But I also want to use the amp with my KX3 out
> of doors in a portable situation.
> I tried my KXPA100 with my 12v 22ah battery and I received a "LO SPPLY"
> message on my KX3 along with the
> bottom right reading "PA FLT". Go in touch with Elecraft and my battery is
> not up to the task of giving my
> KXPA100 12-15amps. I will recharge my battery and try again.
>
>
>
> Question: Will a voltage regulator like the N8XJK Super Boost regulator
> work and or work well with my
> KXPA100? Does anyone use their KXPA100 portable with a battery?
>
>
>
> Jose N2LRB
>
> www.n2lrb.com
>
>
>
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