Lee:
You Orion owners are far to sensitive. I will "knock" any rig I please
including the ones I own (which I have done often). Yes, I own a
microchirping Omni VI! I did manage to fix that problem however by
installing the W9AC ALC mod.
As for the overactive AGC...For lack of a better term I use that to
describe and AGC that applies too much voltage, too quickly and
effectively mutes the receiver for a split second.
I know the Orion develops it's AGC in the DSP stage and I'm sure it also
has an analog loop feeding back to the IF amps. All I can tell you is, I
spent a long time trying to overcome the problem and never did.
As I said, the other rig that I noticed this on was the TS-570. Of
course it has no agc adjustments to play with.
The AGC in the OMNI VI is the best I've ever seen. Why it works so well
in QRN without any complex adjustments is not clear but it certainly is
hard to beat.
So you are amazed by all the adjustments on the Orion's AGC while I am
amazed at the AGC with no adjustments on the Omni VI. We are both
amazed. Being amazed is a good feeling. Let's leave it at that.
Steve N4LQ
-----Original Message-----
From: Lee Crocker <w9oy@yahoo.com>
To: tentec@contesting.com
Date: Fri, 14 Jan 2005 07:03:15 -0800 (PST)
Subject: [TenTec] N1eu Orion static Redux!
> Steve,
>
> I'm glad you adjusted threshold. My comment was not
> to you particularly but about my experience with the
> Orion, to the thread in general. You never seem to
> miss an opportunity to knock the Orion, but your
> present comments makes me wonder if you really
> understand how the Orion's AGC actually works. What
> the heck is an "over active AGC"? Sounds like
> something that needs medical attention. You will note
> the relevant adjustment I described was hang, not
> threshold.
>
> To the rest of the thread:
>
> If you set the hang to zero it is my experience the
> elements won't be lost to static induced gain
> reduction in the AGC. If you set the hang to anything
> except zero you run the risk of some crashes
> activating the AGC enough when copying some weak
> signals to blank character elements. This tends to
> not be a problem on signals well above the noise. For
> those signals I often use "slow", which I have set up
> for 75M ssb ragchewing. For those strong signals slow
> AGC (i.e. a long hang time and a shallow decay slope)
> is like CW with FM like quieting.
>
> This AGC still amazes me in its range of
> adjustability. It combines some of the best elements
> of the old Ten Tec audio derived AGC but also has some
> of the best of RF level AGC. I think it's not always
> easy to appreciate since the controls are not so
> readily available for adjustment, and that makes the
> evaluation somewhat cumbersome. Given that these
> changes tends to make a difference with ESP level
> signals anyway, it's hard to even find a source signal
> that transmits long enough to be able evaluate whether
> an adjustment made a real difference, or is just due
> to QSB or changing band conditions etc. I haven't
> found a real good way to do a systematic analysis of
> what constitutes "best performance" in terms of more
> successful QSO's for really weak stations. If someone
> has a good methodology I would be interested in
> hearing about it.
>
> 73 W9OY
>
>
>
>
>
>
>
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