K8VT,
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.
KA5SIW
--- "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
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
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