[time-nuts] Temperature and signal amp for 'Bay FE-5680A?

paul swed paulswedb at gmail.com
Sat Jan 7 18:43:48 UTC 2012


I ultimately went with the 1 rf amp and splitter method which allowed lower
current consumption and single supply operation. I had seen this approach
in celsite dist amps.
I used a fet IR 510 as I recall cheap and available.

On Sat, Jan 7, 2012 at 12:53 PM, David <davidwhess at gmail.com> wrote:

> The FD-5680A specifications say the output is a 0.5 V RMS sine wave
> into 50 ohms so there are lots of options if that is the signal you
> want to distribute.
>
> There are a number of medium power operational amplifiers specified
> for video applications which will operate at a gain of 2 allowing back
> termination without signal loss while driving several 50 ohm loads in
> parallel.  Most will be current feedback but there are a few voltage
> feedback ones as well.  If you use low supply voltages, then you will
> need to watch the input common mode voltage range and output voltage
> range.  AC coupling will make that easy.
>
> http://www.linear.com/product/LT1206
>
> This amplifier is lower output current but operated at lower supply
> voltages as well.  I might try it with an emitter follower buffer.
>
> http://www.linear.com/product/LT1192
>
> Since you are dealing with just a low level sine wave, a single
> transistor amplifier for each channel would work fine as well.
>
> I would probably convert the sine wave into a logic level square wave
> and maybe use some 50 ohm interface drivers.
>
> On Sat, 07 Jan 2012 11:39:32 -0500, Peter Gottlieb <nerd at verizon.net>
> wrote:
>
> >So, here's a question.  One app is a rack of gear which all needs to get
> >the 10 MHz.  I could just go find some distribution amp, but I would
> >prefer to build something.  Has anyone done this?  I was thinking
> >perhaps a good solid reasonably high power op amp buffer feeding
> >resistors to each output to each piece of gear?  Anyone done this and
> >found any "gotchas" or success stories?
>
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