[aprssig] GPS attachment for Kenwood TH-D7?

[Greg D.]

Since starting this thread I've been browsing around, and the 406A is at the 
top of my list.  At 70ma current draw, it's about as thirsty as the D7 
itself, which would cut the battery life in half.  Also, my D7 battery pack 
is 9.6v, so I'd need a regulator, along with a simple RS-232 level shift.  
So, what I'm thinking now is to mount a 406A on a small PC board, along with 
a holder for 4x AAA NiCd batteries (5v  total), and the level shift 
components.  At ~700 mah, the batteries should last about as long as the D7, 
for a nicebalance.

One question, though...  Does anyone have any experience with putting one of 
these little gems so close to a screaming 5w 2m transmitting antenna?

Greg  KO6TH


----Original Message Follows----
From: "Greg Clark" <K7RKT at bigredbee.com>
Reply-To: TAPR APRS Mailing List <aprssig at lists.tapr.org>
To: "TAPR APRS Mailing List" <aprssig at lists.tapr.org>
Subject: Re: [aprssig] GPS attachment for Kenwood TH-D7?
Date: Sat, 26 May 2007 12:08:22 -0700

There are lots of bare GPS modules out there for under $100.   I know of at
least one with an integrated voltage regulator and 'supercap' that's used to
retain the ephemeris/almanac data.  I think it's the EM-406A (it's on
www.sparkfun.com).

Only problem is it outputs TTL level data, so you'd need to convert that to
RS232 levels.

For my BeeIine GPS/APRS transmitter, I use the Trimble Lassen IQ -- that one
requires an external regulator and external coin cell to backup the memory,
but it's smaller, lower power and has been confirmed to work well at high
altitudes (>18K meters).

-- Greg





On 5/26/07, Scott Miller <scott at opentrac.org> wrote:
>
>Hey, I've got the same paperweight!  =]  Actually, mine gets use as a
>booth
>display now, so it's not a total loss.  If I ever figure out what part(s)
>need to be replaced to get it working again, I'll let you know.
>
>My Deluo rep said they had a unit with a built-in regulator, but I don't
>see
>it listed.  I'll have to ask him which one he was talking about.
>
>Scott
>N1VG
>
> > -----Original Message-----
> > From: aprssig-bounces at lists.tapr.org
> > [mailto:aprssig-bounces at lists.tapr.org] On Behalf Of Jason Winningham
> > Sent: Saturday, May 26, 2007 10:47 AM
> > To: TAPR APRS Mailing List
> > Subject: Re: [aprssig] GPS attachment for Kenwood TH-D7?
> >
> >
> > On May 26, 2007, at 12:07 PM, Stephen H. Smith wrote:
> >
> > > A GPS18 is small and light enough that you could Velco it to the
> > > back of a TH-D7, and steal power directly from the battery pack
> > > terminals
> >
> > Just remember that once you cut the cigarette lighter plug off a
> > GPS18PC, you then have a GPS18LVC.  The regulator is inside the
> > lighter plug.  Such an arrangement would need +5V voltage regulation.
> >
> > I have an expensive paperweight on my desk becasue a student group
> > didn't realize this, and fec unregulated +15 or so into an 18PC.
> >
> > -Jason
> > kg4wsv
> >
> >
> >
> >
> > _______________________________________________
> > aprssig mailing list
> > aprssig at lists.tapr.org
> > https://lists.tapr.org/cgi-bin/mailman/listinfo/aprssig
> >
> >
>
>
>
>
>_______________________________________________
>aprssig mailing list
>aprssig at lists.tapr.org
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>


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