[hpsdr] Penny Whistle

[Graham / KE9H]

Tim:

If you have access to a spectrum analyzer that can look close in at the 
3rd. 5th, etc.
products, you can trim the bias control pots to improve the 
intermodulation products.

Any setting on either pot that does not exceed 0.5 amps per transistor 
is fair game.
And even if you go above that on a transistor, you won't damage anything.

Unfortunately, you won't find a setting that gets rid of them all, at 
the same time.
But you might find a compromise setting that is slightly better than the 
one in the
set-up instructions.

Since these settings are transistor specific and dependent, you do need 
a Spectrum
Analyzer to do it.  Don't be afraid to experiment a little with the 
quiescent bias.

--- Graham

==

Tim O'Rourke wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> All works as expected, tnx Graham. Just for grins I will ck output with SA tomorrow. 
> I will run it through a THP amp so low pass will be FB until Alex is ready.
> Tim W4YN
>
> Tim O'Rourke 
> W4YN at ARRL.Net
> Low Power Amateur Radio Rocks 
> Member of Flying Pigs,ARCI,GQRP,RSGB,ARRL Life Member
> NHRA Life Member
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