[OZAPRS] Re: Packable Tracker TH-D7A solution

[Roger Nichols]

Yes Bruce.  The ideal solution.  Looked long and hard. I would love one - but
not at the price.  It's only one of several tracker units we use for WICEN
events and, unfortunately, cost is a major consideration.
Cheers
Roger vk7arn

-----Original Message-----
From: Howard, Bruce MR [mailto:Bruce.Howard at defence.gov.au] 
Sent: Friday, 9 May 2008 10:54
To: Australian APRS Users
Subject: RE: [OZAPRS] Re: Packable Tracker [SEC=UNCLASSIFIED]


UNCLASSIFIED

Guys,

Don't know why you don't use a hand held with TNC built-in like Kenwood TH-D7A,
GPS head and a small battery pack to pwr the GPS. All in All can be carried on
belt and in top pocket, or if on a bike mount on helmet.

Hope this helps,


Rgds



Bruce


Bruce Howard  CISSP CISA OPST
Security Accreditation Manager
Contractor to Defence
JCTC-SSS Development Office
F1-2-020
26-28 Fairfairn Avenue
Canberra 2600
Tel: +61 (02) 6127 1220
Mobile: 0428974848
Email: bruce.howard at defence.gov.au

-----Original Message-----
From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] On Behalf
Of Dave Ingram
Sent: Thursday, 8 May 2008 18:31
To: vk7arn at bigpond.com; Australian APRS Users
Subject: Re: [OZAPRS] Re: Packable Tracker

vk7arn wrote:
> I've put some pictures and notes on the APRS BakPak tracker here
> http://tas.wicen.org.au/APRS/aprs_bakpac.html.  Seems to work without 
> RF feedback OK now at 4W.  Thanks for the contributions, some of which

> (those suited to the concept) I'll incorporate.

For those that are interested, I did something similar last year when I bought
an OpenTracker 1+. I haven't replied until now due to computer problems, but it
sounds like people are on the same track as I was.

I use 4x AA batteries to run the tracker and Deluo SirfStar III GPS (which is so
sensitive it works well from inside the case), and the Puxing PX-777 runs off
its own Lithium Ion battery.

To avoid RF problems I put a ferrite choke on the microphone lead at the tracker
end.

The description of what I did is at:
	http://ingramtech.com/?p=13
Some photos are at:
	http://ingramtech.com/photos/main.php?g2_itemId=727

It works quite well with a 1m whip antenna on the bike, but still has a little
difficulty around the hills/bumps in inner-west Brisbane. If I put the tracker
onto my colinear it hits the VK4OG igate about 40km away with no difficulty at
5W.

I would like to make something smaller, but that would involve the OT1smd and a
GPS module, all on one board that fits into an empty battery holder on the
PX777. An external LiIon pack would then run the whole lot.


Regards,
	David.
--
David Ingram (VK4TDI)
Real email: dave at ingramtech dot com
Brisbane, Queensland, Australia
http://www.ingramtech.com/
MGRS: 56J MQ 991583    Maidenhead Grid Square: QG62lm
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