[hpsdr] ability to amplify pennywhistle (much) beyond 17W?

[Erik Anderson]

Thank you for all these responses, I think the more and varied responses I
get the better.  I need to know not just what is out there, but what is
necessary and expected and possible.

I've been sitting on the fence for this project for a while (one day not too
long ago the background of all my open tabs turned bright yellow).  Plus I
hadn't known that yesterday's club meeting was "bring your netbook and let's
do digital!" and none of them are putting the same kind of outlay into this
kind of radio (although they are calling me a trailblazer).

On Wed, Nov 17, 2010 at 6:44 AM, Joe Martin K5SO <k5so at valornet.com> wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
>
> Keep in mind that the"QRP rig" portion of your station is the absolutely
> critical part!!
>
> Indeed, it's exactly that part that makes your rig a "high performance"
> radio.  Getting high power from the QRP board set is easy part, relatively
> speaking.
>
> For the higher (VHF, UHF, and microwave) bands one straightforward way to
> get to high power is with one of the numerous (hetrodyne) solid-state
> transverters that DownEast Microwave has available to drive conventional
> amplifiers.   I happen to use a 1296/28 MHz transverter from them that takes
> a 28 MHz output from Penny at a few milliwatts  and outputs up to 50W at
> 1296 MHz, which is more than enough to drive a TH328 triode amp to as much
> as 500W output which (300W) can then easily drive a TH347 tetrode amp to 1.5
> KW output at 1296 MHz.
>
> I previously indicated to you how I choose to achieve 1.5 KW output on the
> HF bands with the HPSDR board set, as one example of working at high power
> at HF, by using the PA/Tx filters/TR relay portions of an analog HF rig.
>  There are many ways to approach your stated goal, of course, but I've found
> that using those portions of an analog HF rig generally works like a champ.
>  I'm sure there are many other, probably more expensive, options that are
> possible that don't use an old "spare" rig to do it if you don't like the
> analog rig option, some of which have already been mentioned in answer to
> your post.
>
> 73,  Joe K5SO
>
>
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