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[TenTec] Mic v Line

To: <tentec@contesting.com>
Subject: [TenTec] Mic v Line
From: nq5t@attbi.com (nq5t@attbi.com)
Date: Fri Apr 4 10:42:35 2003
It is sort of an interesting discussion.  Let me bring it back to the 
Orion so it's a little more on topic.

The Orion allows you to disable either the mic level input or the line 
level input, or run them both.  (The unbalanced line level input 
accessible through the aux connector and supplied breakout cable 
is disabled by default).  If modem tones are fed to the line level 
input, the mic input can be completely disabled -- so you're not just 
turning the gain down and taking the risk that something untoward 
will get in that route.

Also, the DSP monitor function allows you to monitor the transmitted 
signal whether it's sourced from mic or line, which should make it 
reasonably straightforward to determine whether or not there is 
garbage (hum, RF, hiss, or general chortle) on the signal in any 
case.  My experience so far is that if you don't hear it in the monitor, 
it won't be on the transmitted signal -- and vice versa of course.

As I currently lack a TNC of any ilk, I've checked out using the line 
level input with external audio gear and various microphones.  Line 
and mic input levels are settable separately, and the ability to switch 
between them in the menus makes A/B comparison pretty easy.  


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