[DSP-10] DSP-10 to 70 cm

[ww2r at mgef.org]

I use a microwave modules mmt432/144R to enable me to use the dsp10 with
my microwave transverters for 5,10 and 24GHz which have a 435MHz IF. This
box normally covers 432 to 436 with a 144 to 146 IF. They have being going
for as low as $45 recently. 10W 2.8db nf, dual conversion via 28MHz, so
you dont get 3rd harmonics of 144 hitting the pa.

dave

ww2r

> I would like to put my DSP-10 on 432 (435) MHz but a google search on
> transverters doesn't find much these days in terms of off the shelf
> converters or kits.  I suspect that since every rice box made today
> (seems like) has 2 meters and 440 (and even 1.2) that there isn't much
> market for such building blocks anymore.  For the applications I have in
> mind, this equipment would need to be phase locked to the same reference
> that runs my DSP-10, so that would probably be a mod to an existing
> product, if there is such a thing.
>
> So I'm wondering how to proceed.  Possibilities that come to mind:
>
> - Something from the past -- ebay?  People's junk boxes?
> - A design from the past (or present!), like from QST or QEX, that I
> could scrounge, etch, build, and modify.
> - Design my own?  I feel nearly ready for this, but would need some --
> advice on parts, layout, tricks, even packaging.
> - A contemporary product that my searches have missed (because I don't
> know what to call it or it's not on the web or whatever).
>
> I have a second DSP-10 that I will be building sometime in the next year
> or three and have even considered re-engineering it to 70 cm.  Like, the
> 126 MHz PLL becomes 412 somehow, and every relevant filter and amplifier
> in the upstream chain has to be redesigned, replaced or at least
> retuned.  This is over my head right now and if it wasn't then I'd
> probably just know why it isn't a good idea.  Anyway, I don't want to do
> that because I want the two DSP-10s to be roughly interchangeable.  (And
> I'd be back here asking for a 70 to 2 converter.)
>
> Any thoughts, advice, or offers from anyone here would be appreciated.
>
> Courtney, n5bf/6 DM04vf
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