[time-nuts] RFG-RB Crystal Filter

paul swed paulswedb at gmail.com
Sat Jan 16 15:46:40 UTC 2010


As I recall there are 2 amps. Both of the 4 pin type transistor. Small as a
gain stage and the large as a power stage. Considering a 7 port splitter and
the need for 0 dbm or more for each terminated port thats a fair amount of
power neatly wrapped up in a small package.

On Fri, Jan 15, 2010 at 10:49 PM, Bob Camp <lists at cq.nu> wrote:

> Hi
>
> My guess would be that the crystal filter strips the phase noise off of the
> multiplied 15 MHz and then the little amps boost it back up. If that is
> indeed what they are doing, the amps should be pretty quiet when running
> fairly high power signals.
>
> Bob
>
>
> On Jan 15, 2010, at 10:43 PM, paul swed wrote:
>
> > Actually the little rf amps pretty nice. It will take any signal in and
> > amplify it so that you can use a 7 way passive splitter for frequency
> > distribution. At least thats how mine worked.
> > Its pretty efficient. Can't speak to the noise quality.
> >
> > On Fri, Jan 15, 2010 at 10:32 PM, Bob Camp <lists at cq.nu> wrote:
> >
> >> Hi
> >>
> >> I'm sitting here stripping LPRO-101's out of RFG-RB's and kind of
> wondering
> >> about the other "fine stuff" on the PC board. About the only thing that
> >> looks useful appears to be a 15 MHz crystal filter made by either PDI or
> >> Netcom. Has anybody gone to the trouble of pulling one off the board and
> >> seeing what a network analyzer says about it?
> >>
> >> The RFG-RB's were cheap enough that I have no real need to get anything
> off
> >> of the pc board. I just hate to throw away anything that might be
> >> useful.....
> >>
> >> Bob
> >> _______________________________________________
> >> time-nuts mailing list -- time-nuts at febo.com
> >> To unsubscribe, go to
> >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> >> and follow the instructions there.
> >>
> > _______________________________________________
> > time-nuts mailing list -- time-nuts at febo.com
> > To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> > and follow the instructions there.
> >
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>


More information about the time-nuts mailing list