[DSP-10] DSP-10 to 70 cm

[Roger Hayward]

The other place that might be a good way to stir up some ideas is by looking
at Down East Microwave (www.downeastmicrowave.com) .  Steve (the guy @ DEMI)
has a variety of transverters from 6m thru 10 GHz.  The projects go together
without too much trouble.

FYI.

-----Original Message-----
From: dsp-10-bounces at mailman.qth.net [mailto:dsp-10-bounces at mailman.qth.net]
On Behalf Of Courtney Duncan
Sent: Saturday, April 15, 2006 3:17 PM
To: Discussion of DSP-10 2-meter transceiver
Subject: [DSP-10] DSP-10 to 70 cm

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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