[hpsdr] PowerSDR Gain settings

[Chris Smith]

Hi George

Thank you for your response.

I was very lax in my use of English. I didn't mean to imply that Alex performed the ALC function but that this function probably existed in the s/w or FPGA of Penny(lane) as a result of the information provided by Alex.

Actually I don't think my assumption was too far off target. The Calibrate (to a target) function in PA Settings of PowerSDR must use the fwd power level fed back by Alex to monitor the final o/p. How else would the s/w know what the overall gain of the PA was?

I have to admit that I'm VERY annoyed with myself for destroying a perfectly good matched pair of MRF454s because of my own stupidity.

I was aware that the only ALC function that I've seen mentioned in the documentation is that performed by Penny(lane) to limit the o/p to 0.5W. Thanks to Dan Mitchell, W0IQ, for refreshing my memory yesterday.

73

Chris G4NUX

On 9 Sep 2011, at 07:12, Chris Smith wrote:

> ***** High Performance Software Defined Radio Discussion List *****
> 
> Hi George
> 
> I was assuming, as Alex feeds back the fwd & rev power to Mercury and thence to Penny(lane), that this would/could be used as ALC by PowerSDR. I was obviously mistaken in my assumption.
> 
> 73
> 
> Chris G4NUX
> 
> On 8 Sep 2011, at 23:14, george byrkit wrote:
> 
>> ***** High Performance Software Defined Radio Discussion List *****
>> 
>> Dear Chris,
>> Alex of course has no ALC.  It's not at all shown as having that in the
>> schematics, nor is it described as having that feature (ALC) in its manual.
>> Why would you think that it had such a feature?
>> 
>> That said, ALEX power levels are for reporting 0-about 110W.  Penny power
>> level reporting is appropriate for Penny only (0 to .5w).  It would be hard
>> for either to be otherwise.
>> 
>> 73,
>> George K9TRV
>> 
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