[aprssig] GPS attachment for Kenwood TH-D7?

[David Rush]

Greg:

I've not yet built anything, but I'm seriously considering something 
similar to what you're describing.

I've had good luck with the Deluo GPS units. My next project will likely 
be using a dry-cell pack to house the 5 VDC power converter for the GPS, 
as well as interconnects.

I'd drill a hole in the battery case to feed in 12 VDC (or 13.8 from a 
car cig lighter socket). That would internally split to feed power to 
the 5 VDC converter, and feed another short wire just long enough to 
jumper to the radio's external power input on the corner of the radio 
(unless I was confident I could safely feed power in through the battery 
contacts - not sure about that). I'd also have a connector for the Deluo 
coming out of the battery case, and a short jumper for the GPS data wire 
from the battery case to the radio's GPS input plug.

I could mount some sort of bracket on the back of the battery case to 
hold the GPS unit itself, although it would make it difficult to grab 
the radio and hang it on my belt for safe keeping when I'm parked.

This is focused on a minimum fuss vehicle setup - obviously it needs 
external power.

73, David, ky7dr

Greg D. wrote:
> Slight drift...
>
> Has anyone built a GPS unit suitable for mounting on top of the 
> Kenwood TH-D7A(G)? I'm thinking of something with two prongs that 
> would clip into the back of the rig's battery pack, and sit behind the 
> base of the antenna. What GPS module & antenna did you use, and how 
> did you power it?
>
> Thanks,
>
> Greg KO6TH
>
>
>
> ----Original Message Follows----
> From: Mark Cheavens <mcheavens at usa.net>
> Reply-To: TAPR APRS Mailing List <aprssig at lists.tapr.org>
> To: TAPR APRS Mailing List <aprssig at lists.tapr.org>
> Subject: Re: [aprssig] Some Quick Impressions of the Dayton 
> Hamvention2007 -- APRS -- Kenwood TM-D710
> Date: Tue, 22 May 2007 17:32:20 -0500
>
> I will go one step closer. I own a D7 and would buy a replacement for 
> it as well as a D710, ONLY if they have smart beaconing.
>
> I do not own a D700 because it will NOT do smart beaconing. I would 
> gladly send Kenwood the money for one IF it did!
>
> As far as a D7 replacement it should also have a built in GPS and 
> better batter life (Smart beaconing would help).
>
> Too bad the Garmin Rino's won't do HAM frequencies and AFSK data!
>
> Mark Cheavens
> KC5EVE
>
>
> At 05:08 PM 5/22/2007, you wrote:
>> Bob Burns W9RXR wrote:
>>
>> > At 01:37 AM 5/21/2007, Stephen H. Smith wrote:
>> > >I was finally told that the D710 probably won't be available until
>> > >early fall. [snip]
>> > Both the U.S. rep and "Shin" said that the D710 firmware was still in
>> > development and that few details were still being worked out. I asked
>> > about Smart Beaconing, but was told that the D710 would have
>> > "something better". I was also told that "Shin" had spent a lot of
>> > time with Bob Bruninga at the TAPR conference discussing APRS
>> > features for this radio. Bob may or may not be able to confirm what
>> > they discussed.
>>
>> It seems several people asked Kenwood about SmartBeaconing for the 
>> D710, because several such tales were told over at the HamHUD booth.
>>
>> My guess is that "something better" means WB4APR's "PROPORTIONAL 
>> PATHING" (PP). While PP may help QRM issues as well as 
>> SmartBeaconing, it certainly does not produce any improvement in the 
>> appearance of a map track over fixed-timed posits, because the 
>> positions are in fact still being sent at fixed intervals. In 
>> contrast, SmartBeaconing includes both corner-pegging and 
>> speed-variable beaconing, which not only improve the QRM situation, 
>> but also produce useful map tracks, and allow dead reckoning to truly 
>> work. SmartBeaconing has been adopted and refined by many APRS 
>> software and devices, including HamHUD (II and V), UIView, APRS+SA, 
>> SmartPalm, OpenTracker, TinyTrak, TNC-X, and APRS Deluxe. It's well 
>> accepted by the APRS community, which begs the question: why won't 
>> Kenwood adopt it?
>>
>> Speculative 73's,
>>
>> Steve KA9MVA
>>
>> "The HamHUD Guy"
>>
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