[Elecraft] Data mode and filters

[Wes (N7WS)]

Ahem.

I've said before that I used a floating battery and boost regulator to keep the 
supply voltage at the high end of the spec. (I have a KPA500 inline now, so this 
has changed somewhat.)

But I've seen comments here more than once that someone's K3 "works" down to 11 
V. or some such number.

I'm hoping that Elecraft has a PIP that will add another connector to the KPA3A 
to run it on 28-50V to make a K3S/200+.

Wes  N7WS


On 5/18/2015 12:48 PM, Joe Subich, W4TV wrote:
>
> No, I'm on a mission - if that's what you call it - to get the ham
> world to stop using devices with output impedance below 2 Ohms. Most
> times those are coupled with 16:1 broadband transformers and one gets
> significant peak non-linearity because of impedance mismatch and/or
> core saturation problems.
>
> If you want to use 12V systems, use multiple amplifiers in parallel
> or use a lower power output.  If you want higher power with only a
> single pair of devices, get the voltage/impedance up where they will
> operate properly.
>
> > But a significant part of the ham world wants a radio that runs on
> > 11-14VDC, making it much more versatile for portable and mobile
> > operation, carry-on in luggage for a DX trip, and easy to run from a
> > simple solar power system.
>
> There is nothing sacred about 11-14V for any of those functions.
> Simple solar and battery power systems can handle higher voltages -
> it's just a matter of design and planning, switching supplies for DX
> trips can be made just as physically small in higher/multiple voltages
> (particularly since they typically need to handle less than half the
> current, and quiet "boost regulators" solve the mobile issue.
>
> 12V is only used because it has always been used.  Modern equipment
> designers make too many compromises in signal quality to force 12V
> operation.  "Boost Regulators" (e.g. vibrator or motor generator
> supplies) were used for high voltage PAs even in the *tube* days.
>
> 73,
>
>    ... Joe, W4TV