[R-390] Signal Amplifier Needed

[Scott, Barry (Clyde B)]

List,

I've gotten a few suggestions.  Apparently it is possible to build an
external amp to get enough gain.  It became glaringly obvious, however, that
the best solution is to use the "high-power" output on the signal to drive
the counter while using the attenuated output for the radio.  I was thinking
the "high-power" (2V) output was not 'ON' all the time, but apparently it is
and this is one of its best uses.

Being a neanderthal, I don't always know a wheel when I sees it.

Thanks again,

Barry(III) - N4BUQ

> -----Original Message-----
> From: Scott, Barry (Clyde B) 
> Sent: Monday, March 22, 2004 9:30 AM
> To: R390 (E-mail)
> Subject: [R-390] Signal Amplifier Needed
> 
> 
> When I use my signal generator, I usually connect my 
> frequency counter to
> the output to monitor and accurately set the generator's 
> output.  I know
> this is generally not needed, but for some things, accuracy 
> is necessary.
> 
> The problem I have is the counter needs a fairly strong 
> signal whereas the
> circuit in question may need a very low signal so I end up 
> switching the
> output level up and down.  It can get pretty annoying, 
> especially when a
> very loud signal suddenly comes through the radio!
> 
> Is there a simple circuit I could build, perhaps an op-amp or 
> two, that
> could amplify the signal going to the counter while, at the same time,
> leaving the signal generator at the low levels needed for the 
> radio?  For
> example, I may need the generator set to 1mV, but the counter 
> needs about
> 100mV to drive it.
> 
> I'm not a EE design engineer, but I think a simple circuit 
> could accomplish
> this.  Are there op-amps that perform in the 100kHz to 30mHz 
> range that
> could be used in a simple circuit for this?  Am I dreaming to 
> think this is
> a simple endeavor?
> 
> Thanks,
> 
> Barry(III) - N4BUQ
> _______________________________________________
> R-390 mailing list
> R-390@mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/r-390
>