[OZAPRS] Trimble GPS (Lassen SQ)

[rsmitj at tpg.com.au]

Hi Darryl,
It is in the car for the travelling today, connected to a DM700.
My only real frustration is the power supply.
I used what was in my junk box, a 7805 for 5V for the 7404 inverter, and
then a 3.3V Zener 
circuit (all very inefficient).
I gather there is a better GPS model for the tracker. 
Cheers
Ron

Quoting Darryl Smith <Darryl at radio-active.net.au>:

> I have tried, and have about 6 or 7 of the slightly larger Trimble
units,
> with their level converter PCB allowing them to connect straight into a
tiny
> trak. 
> 
> I used them in IronMan Hawaii 2002, and they worked well.
> 
> I am also using the Lassen SQ in some commercial work I am doing
> 
> Darryl
> 
> ---------
> Darryl Smith, VK2TDS   POBox 169 Ingleburn NSW 2565 Australia
> Mobile Number 0412 929 634 [+61 4 12 929 634 International] 
> www.radio-active.net.au - www.radio-active.net.au\web\tracking
>  
> 
> -----Original Message-----
> From: ozaprs-bounces at marconi.ics.mq.edu.au
> [mailto:ozaprs-bounces at marconi.ics.mq.edu.au] On Behalf Of Ron and Val
Smith
> Sent: Sunday, 15 February 2004 7:37 AM
> To: ozaprs at marconi.ics.mq.edu.au
> Subject: [OZAPRS] Trimble GPS (Lassen SQ)
> 
> Hi All,
> I don't know if this has been tried before but I have just obtained a
Lassen
> SQ GPS module (also called the Trimble GPS module)
> It is nice and small, about 2.6cm square and .6cm thick.
> When you manage to connect to it, power it up, and interface the
computer it
> rather quickly finds the satellites and even first time it finds itself.
All
> very good.
> 
> It needs 3.3V and will not run below 2.9V.  Depending on which antenna
it
> draws between 45mA and 60mA.
> The power/data connector is very small and really needs surface mount
> approaches (and good eyesight) to make connections. I don't have that
but
> was able to use 'veroboard' by cutting down the centre of the tracks
using
> an old, but small, dental burr.  There are some mechanical difficulties
with
> holding it in place as well. Double sided tape is recommended in the
manual
> if the soldering tabs cannot be used but in the hot climates inside a
car
> the glue just melts.
> 
> The software and manuals are available on the Trimble web site and the
> software works and the manuals are ok.
> 
> The data lines, both in and out, need to be inverted before  connecting
to a
> computer or APRS device, eg Kenwwood rig.
> 
> The default data mode is TSIP but it can be commanded to NMEA.
> 
> So, after a day playing, it works fine on the bench. I hope to have some
> more time today to make up a better physical arrangement, which is the
messy
> part, and put it in the car.
> 
> Has anybody tried these?
> 
> Cheers
> Ron
> VK4AGS
> 
> 
> 
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