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

[Joe Martin K5SO]

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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