[hpsdr] Penelope max pwr without final amp

[Joe Martin K5SO]

On closer examination, I see that Penelope puts out a very trashy  
signal spectrally (any band)  if the PA setting is set for absolute  
maximum power out (i.e., 38.0) even though the power level looks okay  
on a power meter.  Here, at least, it appears that a "practical"  
maximum PA setting is 38.4, instead in order to maintain a nice clean  
signal.  At a slightly lower power output setting of 38.4 for the PA  
setting value, the signal is clean once again on mine.   Bottom line,  
I suppose, is to avoid using the absolute highest power output (lowest  
PA setting value) settings in PowerSDSR with Penny!

I suppose I've answered my own original question then.  Thanks anyway!

Joe K5SO


On Jan 17, 2009, at 8:24 AM, Joe Martin K5SO wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
> Phil or anyone,
>
> I am using low power (mW) output from Penelope by removing JP2 and  
> taking the rf output from pins 1 & 3 of JP2 to drive a high power  
> amplifier system.
>
> I would like to run the PA settings in PowerSDR at maximum (38.0 =  
> max pwr output setting for all bands).  Will Penny be alright  
> running at maximum in this way?  I don't see any obvious problems  
> with Penny at the moment but thought I'd ask to be sure.
>
> 73,  Joe K5SO
>
>
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