[hpsdr] Pennywhistle q. about negative feedback

[David McQuate]

Hi Paul,
   You're the first I've heard of to apply negative feedback.  It sounds 
like a good idea.  It would be great to have a number of data points 
that show how IMD performance improves and the corresponding gain & 
power output.

On 11/18/2012 2:34 PM, Paul Fletcher wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi all,
>
> I'm playing around with the negative feedback option on Pennywhistle 
> to try and improve the IMD numbers (I only need about 5 watts drive 
> out anyway) and wondered what others have done for the feedback 
> winding on T2? I'm currently using a single turn and R2 / R12 at 10k 
> which gives a noticeable improvement but still develops more power 
> than I need. Any other suggestions on configuration? I'll play around 
> some more but it's always nice to know what everyone else is up to.
>
> 73 Paul
> M1PAF
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