[TenTec] TenTec] TX EQ = -14 dB for PSK31

[Ron Castro]

The power level control only sets the threshold for the ALC and has no 
effect on the linearity of the final.  Running the control at 100 but 
adjusting the audio input for about 25 Watts output will ensure the least 
amount of unwanted level-changing during a PSK-31 transmission.  That being 
said, I have determined that the software ALC apparently operates 
unpredictably to some degree at any audio level input.  You can demonstrate 
this by running a tone into AUX input and reducing it to where the ALC light 
goes out, then start reducing it more.  At various points, the output will 
appear to 'hunt' while the input is kept steady.  This relates back to an 
earlier thread about 'talk power' which is dependent on ALC action which 
appears to be quite aggressive in the V 2.x firmware.

BTW...has anyone determined the function or the proper setting of R-19 in 
the A5 ALC circuit?

      Ron N6IE
 www.N6IE.com
(Formerly N6AHA)

----- Original Message ----- 
From: <K4IA at aol.com>
To: <tentec at contesting.com>
Sent: Friday, December 29, 2006 5:52 AM
Subject: Re: [TenTec] TenTec] TX EQ = -14 dB for PSK31


> Interesting that you leave the transmit power at 100w and control the 
> output
> by reducing the audio drive.  Wouldn't that underdrive the output  and
> introduce non-linearities? I have always reduced the Orion power output to 
> 25w and
> then adjusted the audio drive to just below the ALC lighting up.  I  don't
> remember having to change settings from band to band.
>
> What say list? Which is the better way to control the PSK output?
>
> k4ia
> Craig  "Buck"
> Fredericksburg, Virginia USA
>
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