[Racal] Panadaptor output from RA6790/GM

[Dan Rae]

Dave,
I fitted a "First IF Sample" to my 6790/gm by putting a FET follower on to the
output of the first mixer.   This gives a very low level output due to the mixer
loss, and for practical use will need to be fed into an appropriate broad band
low noise/low intermod  amplifier stage.   But the raw output on mine is enough
to use with an HP spectrum analyser.   If you tap into the receiver further down
you will get a higher level, but it will be bandwidth limited by the roofing
filter(s).  Also I know of no ready built or commercial panadptors that have a
40.455 MHz input, although the rather fine design by Bob Dildine (?)  that was in
QEX a while back would be easily adaptable.  The Racal  US "panadptors" for the
RA*217 series have  2-3 MHz and  wide and narrow 1.6 MHz inputs, but the wide 1.6
will only work with the RA6217A3 version.   There are a few commercial with 21.4
MHz inputs that you could build an adaptor for.

As others have pointed out the connectors are called "SMB" and are available from
just about everywhere.    I can send you a few if you give me your address.

73 Dan
ac6ao g3ncr

DAVEINBHAM@aol.com wrote:

> Has anyone out there hooked a RA6790/GM to a panoramic scope ( Panadaptor ) ?
> If you have, I would like to know how you did it.
>
> If I have to do this from scratch, I will start by coming off TP3 on board A3
> and through a buffer amplifier to the outside world.
>
> Also, does anyone have a part number ( preferably Digi-Key or Mouser as I
> gotta order stuff from them this week for another project ) for the minature
> jacks on the PC cards that connect to the various mini coax cables in the
> radio. I want to unplug the cable presently going from card A4 to IF out on
> the rear aporn and plug it into the jack that will be on the buffer amplifier
> card I will make .
>
> Hopefully, I will get time to build this week after next.
>
> Kindest regards,
> Dave
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