[hpsdr] Pennylane output power

[John Petrich]

Phil and George,

Thank you both for answering my post.  I understand the intention for
PennyLane with the modified software.  Want to make sure that all of the
elements are currently in place and that I can use the Gain by Band settings
to fix the output with confidence.  Sound like I can.  Thanks to all the
people who have worked so hard to make the HPSDR modules such a success.

Regards,
John, W7FU

-----Original Message-----
From: Phil Harman [mailto:phil at pharman.org] 
Sent: Monday, June 27, 2011 5:42 PM
To: John Petrich
Cc: hpsdr at lists.openhpsdr.org
Subject: Re: [hpsdr] Pennylane output power

Hi John,

Yes, you can use the Gain by Band settings with both Penelope and PennyLane.

The power output on PennyLane is adjusted by varying the power out from the
DAC rather than varying the amplitude of the I & Q signals. That way the
full 16 bits are used at every power level which maintains the maximum S/N
ratio.

We also split the PA stage into two sections which is the reason for higher,
and more consistent, power output across the spectrum.

73 Phil...VK6APH




> ***** High Performance Software Defined Radio Discussion List *****
>
> All,
>
>
>
> One more time:  Is it now satisfactory to adjust Pennylane's output 
> power using the Gain by Band settings in the PA Setting tab without 
> degrading the S/N ratio of the transmitted signal?
>
>
>
> Have successfully installed Pennylane using both Bill's and 
> Doug's,W5WC, consoles.  Pennylane makes substantially more output 
> power across the spectrum than Penelope does.  Have the input ranges 
> of my programmable external attenuator module set up for Penelope's 
> power output levels.  It would be so much easier for me to simply 
> adjust the Gain by Band settings to place the Pennylane output in that 
> same range.
>
>
>
> Regards,
>
> John,W7FU
>
> _______________________________________________
> HPSDR Discussion List
> To post msg: hpsdr at openhpsdr.org
> Subscription help:
> http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
> HPSDR web page: http://openhpsdr.org
> Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/




 1309224333.0