I believe this a harmonic from the PTO?  The PTO in Ten-Tec rigs generates a 
frequency between 5.0 and 5.5 MHz (see 3-14 in the manual).  Four times that 
would be a tone close to 21.320 MHz.  As I remember it is very strong and very 
sharp.
I found with the Omni V a similar birdie was impossible to remove. If you want 
a quiet rig with crystal mixing this is the price you pay.
73,
Rick
VE7TK
Website:  http://www3.telus.net/ve7tk
Subject: 
[TenTec] Argosy II Questions
From: 
Bill Mellema <mellema@qis.net>
Date: 
Sat, 21 Mar 2009 16:45:04 -0400
I have a Argosy II  and have a few questions and would appreciate any 
insight:
1. I have a strong signal on 21.320 Mhz...is this normal? I know that it 
is generated internally. I don't see it mentioned in the manuals specs
2. I am pretty sure I need to rebuild the PTO...is it a big deal to do? 
I am handy equipment.
3. How about alignment of the PTO?
Thanks in advance..
Bill N3WM
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