[TenTec] More ARRL Lab Data

[Carl Moreschi]

The DSP/AGC artifacts noted by Sherwood in the Orion can be completely
eliminated by adding a very small amount of hang time.  They were caused by
the AGC being so fast that the noise came up between dit and dah elements of
a CW character.  This gives the impression that the reciever is noisy when
in fact all that is happening is the gain is being increased in between
elements.  With full programmable AGC, you have the ability to make things
real good or make things real bad at your option.  The Orion has an awesone
receiver in it.

Carl Moreschi N4PY
121 Little Bell Drive
Bell Mountain
Hays, NC 28635
----- Original Message ----- 
From: "John Rippey" <w3uls73 at gmail.com>
To: <tentec at contesting.com>
Sent: Wednesday, September 12, 2007 10:51 AM
Subject: [TenTec] More ARRL Lab Data


> The October review of the FT-2000D in QST, now posted, contains an
> article by Mike Tracy outlining further refinements in the Lab's
> testing regimen.  Oh, brother, he's leaving me behind.
>
> What comes through for me in the October review is that the FT-2000,
> along with the PRO III of the DSP rigs, has to labor long and hard to
> equal the IMD3 results for the discontinued Mark V, and do not equal
> the IMD3 of an unmodified OMNI VI.
>
> So if one wants to remain analog, you can go with an INRAD roofing
> filter mod and be well ahead of the game.  Of course, there are
> refinements in the DSP rigs that make them (perhaps) more fun to use,
> but the basics have yet to be bettered. (Exceptions, ORION and
> IC-7800, but then you get with these high-performing rigs the
> troublesome DSP/AGC artifacts R. Sherwood has noted.)
>
> Does the OMNI VII avoid the DSP artifacts bug?
>
> 73,
> John, W3ULS
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