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Re: HR 2510 and DEMI

Thanks for info. I found this on Google. Now to find the QST issue!

Dave Metz wrote:

> > Date:          Sun, 16 Sep 2001 18:06:56 -0700
> > From:          Don DeGregori <don1mh@loop.com>
> > To:            "amsat-bb@AMSAT.Org" <amsat-bb@AMSAT.Org>
> > Subject:       [amsat-bb] HR 2510 and DEMI
> > Question
> >
> > I found my old AO-13 DEMI 28Mhz to 70cm Transverter (10 watts). I also
> > have an HR 2510 10 meter rig (25 watts). I would like to use the 2510 to
> > drive the DEMI. But, have to drop it's power to 1 watt or so. Has anyone
> > seen how to do this? Probably come out of the driver stage? But need
> > some specific ideas.
> >
> > Thanks,
> > Don...W6RWN
> >
> Dear Don,
> A few years ago QST published an artical on how to modify the 2510/2600
> for use with transverters.  The simplist way is to use a power attenuator in
> front of the transmit mixer input.  I did this for three of my transverters, and it
> has worked perfectly.  That is, no problems at all.
> I did it using two attenuators in series to go from 25 watts down to .025 watts.
> That's 20 db of loss.  In your case you need 14db of loss.  Note that the first
> stage of the attenuator that I use is a 10db unit built from metal film low inductance
> power resistors.  These are cheap and available from Digi-Key.  If you cannot
> find the artical (I have no idea of the month/year, you are going to have to consult
> the yearly index), let me know and I will dig out the schematic of my rig.
> --73-- David WA0AUQ

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