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Re: [TenTec] Omni D Update

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Omni D Update
From: James Boswell <ka5siw@yahoo.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Fri, 10 Feb 2006 09:43:34 -0800 (PST)
List-post: <mailto:tentec@contesting.com>
     Five watts less you will not miss, compaired to
the loss of a fine radio. I run mine at 90 watts most
of the time.

--- "Carter, K8VT" <k8vt@ameritech.net> wrote:

> Earlier, I posed a question to the group about an
> Omni D (Series B) that 
> I was working on and promised an update upon
> completion of the job--so 
> here it is.
> First, thanks again to those who responded and also
> to John at TenTec!!
> The original problem I noticed was that the 160
> meter waveform going in 
> to the final amplifier module was very distorted
> compared to the 80-10 
> waveforms. This turned out to be an alignment issue.
> Adjusting the mixer 
> balance (R2) on the "Osc-Mixer" board solved that
> problem.
> As it happened (and unbeknown to me), the ALC diode
> was history. "So 
> what", you ask. Well as I was checking the radio
> into a dummy load, I 
> was pleased to note that I was getting 110-115 watts
> output (due to no 
> ALC). To make a long story short, TT says the final
> transistors (MRF 
> 458s) are fairly delicate and won't tolerate very
> much over 100 watts 
> out--so yes, you guessed it, one of the 458s is
> toast (open emitter).
> I changed the ALC diode (easy), was fortunate enough
> to find a new, 
> matched pair of 458s and replaced them (NOT a job
> for the faint of heart).
> Bottom line, the radio is back in fighting trim
> again. And as John at TT 
> says, every time an Omni D leaves his bench, it is
> set at 90-95 watts 
> max output. A word to the wise.
> Thanks again to all and 73,
> Carter K8VT
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