[TenTec] AGC Response 2.037j v 2.059d

[Ron Castro]

My guess about the faster decay on O2 with 2.037J is that short pulses cause 
a fast attack, followed by a fast release.  On very strong SSB signals, this 
is most noticeable since the S-meter moves down very quickly then seems to 
plateau and continues to decay at what looks like normal decay rate.  This 
may have been intentionally programmed in to reduce the effects of static 
pulses.  If so, it seems to work, although it needs a little hang-time.

Ron N6AHA

----- Original Message ----- 
From: "Grant Youngman" <nq5t at comcast.net>
To: "'Discussion of Ten-Tec Equipment'" <tentec at contesting.com>
Cc: <orion565 at yahoogroups.com>
Sent: Saturday, September 09, 2006 10:00 AM
Subject: [TenTec] AGC Response 2.037j v 2.059d


> Finally got both the v2 Orion and the Orion II up on a multi-coupler so I
> can listen on both simultaneously.
>
> Regarding the comments about the AGC on 2.037 sounding "fast", I agree. 
> If
> one can presume that the S-meter movement is actually following AGC, the
> difference between the v2 Orion and the Orion II is VERY visable also.
>
> I'm watching S-5 to S-7 signals on 20M, with both radios' AGC set up the
> same.  I have SLOW AGC decay set to 5 dB, no hang, 1:10, and THRESHOLD set
> to 0.6 uV.  The v2 behaves the way one would expect with nice slow AGC: 
> the
> meter action is smooth with visible decay, and very little response to 
> voice
> peaks.  The Orion II meter is bouncing all over the place, with very fast
> decay, and is responding to voice peaks pretty much the same way 
> regardless
> of AGC speed setting.  Even with decay on the II set down to 1dB, the 
> meter
> still bounces on peaks, and shows rapid decay.
>
> The radios don't sound that much different, but meter action is another
> story altogether.  I "think" I hear faster decay on 2.037j, but it could 
> be
> because my eyes are tricking me.
>
> If the meter does in fact follow AGC, I think something is amiss in 2.037j
> regarding AGC decay speed settings.
>
> I also hear some distortion fuzz on the v2 Orion using the internal 
> speaker.
> It is not present on an external speaker.  This might just be something
> mechanical.
>
> Grant/NQ5T
>
>
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