[hpsdr] PowerSDR Gain settings

[Kjell Karlsen]

Hi Chris.

If you are using Penny, never use gain settings between 38 and 38,8 dB.  
The distortion can be very high, that is there are some unwanted sidebands  
generated at this settings. Pennylane should not have this problem.

73, Kjell





På Thu, 08 Sep 2011 22:58:24 +0200, skrev Paul Fletcher  
<paul_fletcher at me.com>:

> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi Chris,
>
> I'm not sure it's that simple. Penny and Pennylane have different output  
> stages for a start. I would do this the simple way and begin by taking  
> your 100W PA out of circuit and measure the output of Pennywhistle,  
> while adjusting the gain figures to get 5W out at 100% drive on each  
> band - this will give you some idea of a starting point when setting up  
> your 100W PA. Also if you are using Penny you want to adjust your input  
> pad for Pennywhistle so that Penny is near 500mW for 5W out from  
> Pennywhistle to keep the signal as clean as possible (Pennylane  
> shouldn't be affected by this as much if at all)
>
> HTH
>
> 73 Paul M1PAF
>
> ----- Original Message ----- From: "Chris Smith" <chris at vspl.co.uk>
> To: "HPSDR list" <hpsdr at lists.openhpsdr.org>
> Sent: Thursday, September 08, 2011 7:34 PM
> Subject: [hpsdr] PowerSDR Gain settings
>
>
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Hi
>>
>> Am I right in thinking that the Gain by Band (dB) settings in PA  
>> Settings on PowerSDR should reflect the total gain after Penny(lane)?
>>
>> If I'm interpreting this correctly then assuming a mean gain for  
>> Pennywhistle of around 40dB LESS the 6dB pad I have on Pennywhistle's  
>> input PLUS the 14dB mean gain of my PA the TOTAL gain = 40 - 6 + 14 =  
>> 48dB.
>>
>> Should I set the Default gain to 48 or all band gains to 48 before  
>> doing a Calibrate with a Cal. Target of 100(W?)? What is the Advanced  
>> Calibration Routine?
>>
>> I'm asking because I think I've destroyed the pair of MRF454s in my PA  
>> by over driving them. :-(  I believe I should have had a 12dB pad on  
>> the input of Pennywhistle to limit the input to my PA to 5W.
>>
>> 73
>>
>> Chris G4NUX
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