[hpsdr] PS and THD

[Warren C. Pratt]

Hi Brian & Mike,

No, unfortunately, PS won't correct the harmonics.  In the 'Information' 
document that's embedded on the PureSignal form, there's a short section 
on Correction Bandwidth.  Perhaps the easiest way to think about this is 
that those distortion products are outside the correction bandwidth.

73,
Warren  NR0V

On 2/9/2014 4:16 PM, Mike Seguin wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> I really couldn't imagine any scenario where that would work, but I 
> had everything hooked up on the bench so I just ran my bare Hermes 
> into my SpecAn and saw no change on the 2nd or third harmonics with PS 
> on/off. Test run at 50 MHz.
>
> I'm seeing 30 dB on IMD on the bare Hermes, but so far ~ 20 dB is 
> about the best IMD improvement when Hermes is run with my driver/amp.
>
> Mike
>
> On 2/9/2014 6:14 PM, Brian Lloyd wrote:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>>
>>
>> Has anyone looked at the effect of PureSignal on harmonic distortion? It
>> makes a 30dB improvement in IM3. Does it make a similar reduction in
>> THD? If so, does it do enough that one might be able to meet FCC signal
>> purity requirements without having to resort to low-pass filtering after
>> the PA?
>>
>>
>>
>> -- 
>> Brian Lloyd, WB6RQN/J79BPL
>> 706 Flightline Drive
>> Spring Branch, TX 78070
>> brian at lloyd.com <mailto:brian at lloyd.com>
>> +1.916.877.5067
>>
>>
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