[TenTec] Orion 1 & 2 "Talk Power" problem

[Ron Castro]

That is a dramatic difference between the v 1 and v 2, and the numbers you 
report on v 2 are in line with what I see here.

I checked the O2 against the TS870 and saw average outputs on the O2 
(barefoot) of 5-10 Watts with no SP and 10-12 Watts with SP at 7.  The TS870 
showed 10-20 Watts with no SP and 20-30 with compression and ALC in normal 
ranges.

I looked over that article by Dough Smith and it looks like there is a dual 
ALC system.  I doubt very much that all of the digital part of the system 
could have been completely taken out, but it certainly possible that is has 
been simplified or that the parameters have been set differently.  What may 
be needed is for the analog ALC to be driven harder.

      Ron N6IE
 www.N6IE.com
(Formerly N6AHA)

----- Original Message ----- 
From: "Merle Bone" <merlebone at charter.net>
To: <tentec at contesting.com>
Sent: Thursday, December 21, 2006 3:26 PM
Subject: Re: [TenTec] Orion 1 & 2 "Talk Power" problem


> Grant (NQ5T) said:
> "I don't recall this ever being an issue on the 565 v1.  I suspect it's
> another benefit of the revised DSP code in v2/II."
> --------------------------------------------------------------------------------------------
> I checked the "talk power issue" on V1.373b5 a few minutes ago. I ran the 
> test on 10M using the Ameritron AWM-30 Peak/Avg reading watt meter. With 
> the audio set to flash the ALC light on audio peaks, the AWM-30 was 
> consistently reading 1400W Peak with my voice. The Alpha 87A Peak reading 
> meter was periodically "peaking" at 1400W also. In the average position 
> the AWM-30 was showing about 150W as the average (No speech processing). 
> With the speech processing set to 7 the AWM consistently read 1400W peak 
> and when set to average it read between 800 and 900W. I certainly don't 
> observe a "talk power" issue the with the V1 code.
>
> In this article http://www.doug-smith.net/digitalagc.htm  Doug Smith 
> describes the AGC and ALC techniques used in the Orion V1 code. While the 
> AGC discussion is pretty clear (And rather elegant - such as in preventing 
> AGC "overshoot"), the ALC discussion isn't so clear about what is 
> implemented, although I agree that it is likely that the DSP code is 
> involved in the ALC process. And, of course, all bets are off on what is 
> in the V2 code today.
> 73, Merle - W0EWM
>
>
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