[hpsdr] Penelope output.

[Chris Smith]

Ah! Wait a moment. This test was done using the TUN button in the  
software. Does this put out a reduced power level?

Chris
G4NUX


On 14 Jun 2009, at 11:24, Chris Smith wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
> Help!
>
> I've just got around to doing some tests with Penny:
>
> With the HPSDR software settings jacked up to 38dB, which I believe  
> gives maximum output at the antenna socket, with a scope I'm  
> measuring 4V p-p into a 50 ohm dummy load.
>
> Now it's a while since I stirred my one remaining grey cell into  
> action but I believe this equates to approx 40mW output which is  
> what the power meter is showing. Any higher settings in the software  
> give lower output figures. Am I doing something wrong in my  
> calculations or have I got a problem with Penny or a setting  
> somewhere?
>
> P-P / 2 = 2V     :    2 x 0.707 = 1.414 (V RMS)  :  P = V^2 / R      
> 1.414^2 / 50 = 0.04W    or   40mW
>
> 73
> Chris
> G4NUX
>
>
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