[time-nuts] Identify RFTGM-II-XO Part

paul swed paulswedb at gmail.com
Wed Jan 10 09:21:26 EST 2018


Pat
Here is my thought. Everything may be just fine actually. This looks like
the same approach used on older technology even the transistor. Its job is
to run class AB1 and boost the signal to something like +27 dbm. Lots of
power.
The reason is these then typically drive a passive 8 or 16 way splitter to
drive the various systems in the cel tower..
Regards
Paul.
WB8TSL

On Wed, Jan 10, 2018 at 12:33 AM, Patrick Murphy <fgdhrtey at gmail.com> wrote:

> My recently purchased RFTGm-II-XO threw a fault today. When I opened it,
> the unmistakable smell of something way too hot was released. I guess this
> is one bad aspect of the totally sealed enclosures these come in. Anyway,
> when I plugged it in while open, I found U105, the microwave transistor
> about centered in the attached photo was getting way too hot. It appears to
> be an unmarked microwave transistor, probably part of the 15MHz output
> circuit. VR101 - a 7815 on the far right is also getting pretty hot. I
> expect the two are connected.
>
> Anyone have an idea of what the nomenclature for U105 is? Replacing it may
> be a pipe dream, but knowing its name will be a good first step.
>
> Thanks for any assist.
>
> -Pat
>
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