[TenTec] 1220 2-meter(Was Ten-Tec service)

[Don Bullard]

Thanks for the additional info Carl.

73,

Don W4IML

----- Original Message ----- 
From: "Carl Morris, WN3DUG" <cwmorris at pa.net>
To: <tentec at 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 at pa.net
> 
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