[hpsdr] Pennywhistle q. about negative feedback

[Paul Fletcher]

Chris,

I have exactly the same setup (AN762 amp - 140W version) so I'll let you 
know what I end up with.

Cheers,
Paul M1PAF

----- Original Message ----- 
From: "Chris Smith" <chris at vspl.co.uk>
To: <hpsdr at lists.openhpsdr.org>
Sent: Monday, November 19, 2012 8:53 AM
Subject: Re: [hpsdr] Pennywhistle q. about negative feedback


> ***** High Performance Software Defined Radio Discussion List *****
>
> Paul
>
> Please keep me informed of any progress you make on this. I also only need 
> about 5W out from P'whistle to drive a 140W PA from CCI and would rather 
> use f/b than some sort of pad.
>
> Cheers & 73
>
> Chris G4NUX
>
> On 19 Nov 2012, at 07:01, David McQuate wrote:
>
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> 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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>>
>> -- 
>> Clear Stream Technologies
>>
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