[hpsdr] Penelope output.

[Kjell Karlsen]

Hello Ghris,

Tune gives 1/10 of full power.

Try to use the 2-tone test. Then you get full power. When measuring with a  
scope, record the peak voltage and calculate the PEP.

73, Kjell LA2NI







På Sun, 14 Jun 2009 12:57:42 +0200, skrev Chris Smith <chris at vspl.co.uk>:

> ***** High Performance Software Defined Radio Discussion List *****
>
> 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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