Thanks for the additional info Carl.
73,
Don W4IML
----- Original Message -----
From: "Carl Morris, WN3DUG" <cwmorris@pa.net>
To: <tentec@contesting.com>
Sent: Monday, December 19, 2005 2:33 AM
Subject: [TenTec] Ten-Tec service
Bob & Don,
The 1 uF Capacitor was added to prevent "Resets" on
the 1220's microprocessor, due to noise spikes.
I had problems on my 1220 until Ten-Tec Service told
me to add this cap, and then the problems went away.
I actually used a 4.7 uF cap, at the time, and my notes
say "to prevent 'Glitches' on the Master Clear Micro-
Processor signal from causing frequency changes,etc."
Another cap not normally included or installed in the
1220 when built, is C86 (4,700 uF - 35VDC Electrolytic),
which helps resolve ignition noise problems, and is
discussed on Page 15 (Service section) of my 1220
manual. Ten-Tec gives some P/N examples for this
part in the 1220 manual and also a Ten-Tec Part No.
23320 for obtaining from Ten-Tec.
There is space on the PCB (C86) to install this capacitor,
but there is a limit on the physical size allowed for the cap.
Again, I installed this cap and never had any more noise
problems while mobile.
72/73, Carl, WN3DUG
cwmorris@pa.net
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|