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Re: [TenTec] Help with New Orion II

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Help with New Orion II
From: Robert & Linda McGraw K4TAX <RMcGraw@Blomand.Net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Tue, 14 Feb 2006 18:54:45 -0600
List-post: <mailto:tentec@contesting.com>
Yes and add a bit of IM generated by some of the solid state amps to the 
3KHz wide SSB signal and it is now 6 or more KHz wide.  Rapidly I might add. 
Unfortunately, the solid state amps have a very sharp knee between being 
clean and transitioning to being a distortion generator.  Oh it rarely 
affects the fundamental SSB signal but transmitted bandwidth increases 
rapidly.  Unlike the old fashion tube amps, specially those that use tubes 
developed for AB linear service, these have a very soft knee and can be 
somewhat over driven or lightly loaded with little observed problems.  As 
was said, if it is in the passband, you're gonna hear it.

As to why heard on the Orion and not on the FT, as someone suggested, was 
the 600 Hz roofing filter actually activated?  An oversight on this point 
makes all the difference in the world.  And then is the point of AGC 
threshold where the gain under certain conditions is actually increased in 
the processing chain.

Bob, K4TAX

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