[time-nuts] Identify RFTGM-II-XO Part
dan at irtelemetrics.com
Wed Jan 10 12:22:50 EST 2018
It's possible that's one of the integrated RF amps, and not just an RF
You should be able to tell by tracing out the circuit. The inputs and
outputs will typically be capacitor coupled, with DC fed to the output
through a chip inductor or similar choke and resistor. There are some
other variations, but that's a pretty common style part.
Here's and example. Although I doubt this is exactly what you have.
If it's one of these style amp's, you may be able to find a compatible
part if you know the rough gain required and frequency of operation.
It appears there is a mini circuits part close by, possibly tied into
this amp. Can you tell what part of the circuit this board covers? GPS
On 1/10/2018 1:26 AM, time-nuts-request at febo.com wrote:
> Message: 3
> Date: Tue, 9 Jan 2018 23:33:33 -0600
> From: Patrick Murphy<fgdhrtey at gmail.com>
> To:time-nuts at febo.com
> Subject: [time-nuts] Identify RFTGM-II-XO Part
> <CAG1UqTg3dkjunSiOc=hrkxv7untygMKPT6XqSrfm9qMdwSD2DQ at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
> 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.
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