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Jim Vincent wrote:
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That is just pure nonsense (the up vs down part). You can buy a 30W
(15V @ 2A) dc-dc converter for $62 from Mouser (search for
UHE-15/2000-Q12). The description says the input is 24V, but it really
is 9-36V, which should cover just about any battery you want to come up
with. The thing is 88% efficient and occupies 1.5 in^3. You can buy
lower power ones even cheaper. If that makes your 14V heart feel
better, go for it (it won't damage your radio).

Tom Seim
2G DG-400


Get one of these for $45 and it will take your 12 V input and upconvert
it
to 14V, handle 2A and be about 83% efficient.

http://www.dimensionengineering.com/AnyVolt.htm

I wish I had been available two years ago when I built my own 13.9V
upconverter.

This looks like a hobbyist product that would have to put into an
enclosure before using in a glider. What I found is a commercial dc-dc
converter that is in volume production from a company that has an
established reputation. It is also a much smaller package, has
over-voltage protection & short circuit protection, and meets all
specifications at -40 C. I doubt that the other unit has even been
tested at anything but room temperature. The level of testing and
quality assurance that a company like Datel has to offer should not be
underestimated.

Tom Seim
2G DG-400

Tom, my guess is the product is built with off the shelf components that are
more than adequate for our purposes. If I was to get one, I would pull the
display and Amp/Volt switch and mount them on my panel. The rest I would
put in a standard Radio Shack enclosure, drilled out for cooling/venting
purposes.

Regarding Datel, do you think they're in compliance with MILSPEC-1540B and
have been fully vibe/shock/thermal tested....I doubt it. Great that you
found another vendor, but please don't dis a vendor because they cater to
hobbyists. Dimension Engineering caters to radio control aircraft, which as
you surely know experience diverse environments. If their reliability was
bad, they'd be out of business in no time...s**t listed too on every
newsgroup. I'm sure either vendor would work just fine.