[OZAPRS] TT4 Switchable?

[vk7arn]

A bit lost here with these Primary/Secondary/Off positions.  I thought we
were
simply making or breaking to switch between Primary and Secondary.  What's
the
difference between Off and Primary?  Just to add to the confusion though,
I did
use a DPDT switch and included a red and green LED in the front of the car
so's
I can see which config I'm on.  This after more than one occasion of
driving all
weekend, seeing nothing on return home, then finding I'd been on the wrong
config.  All I have to do now is to remember to put the lock on the 706 so
I
don't inadvertently knock it off freq!
Cheers
Roger VK7ARN

-----Original Message-----
From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] On
Behalf
Of vk5ex.andrew
Sent: Friday, 22 February 2008 08:22
To: VK / ZL APRS Users
Subject: Re: [OZAPRS] TT4 Switchable?


Hi all,

Just conferring with Gordons comments. I use a TT3 in the Landcruiser and 
managed to install one of those very small DPDT switches into the original

plastic case .. Twas a bit of a squeeze though !! .. .. So I have 300bps
HF 
on the down position of the switch .. VHF 2m on the up position of the 
switch .. and (obviously) the off position is the switch in its centre 
portion. Note that I set the switch to fully up for VHF and fully down for

HF .. ie, VHF being the higher frequency than HF hence the switch in the
up 
position to run VHF APRS .. Had to create some sort of a convention so I 
could more easily prevent myself from beaconing 300BPS all over 2m and
visa 
versa !! .. ( Not really enough room to put labels on the box and they'd
be 
too small to read anyway)

Regards .. Andrew .. VK5EX


----- Original Message ----- 
From: "Gordon Taylor" <gordon.t at internode.on.net>
To: "'VK / ZL APRS Users'" <ozaprs at aprs.net.au>
Sent: Thursday, February 21, 2008 9:24 PM
Subject: RE: [OZAPRS] TT4 Switchable?


>I have done this with the TT3 and "Araldited" the switch on the outside 
>of  the DB9 that goes into the TT3.  If you use a center off DPDT you 
>can have  an off position as well.
>
> Regards,
> Gordo VK4VP
>
> -----Original Message-----
> From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] 
> On Behalf Of Michael Wain
> Sent: Thursday, 21 February 2008 8:46 PM
> To: ozaprs at aprs.net.au
> Subject: re: [OZAPRS] TT4 Switchable?
>
> Hi Geoff,
>
> In the TT4 Tracker config software set Primary window with the 300 
> Baud packet box unticked, in the
>
> Secondary window set 300 Baud packet box ticked, save setting, then 
> run a wire from pin 5 on U1 (sw1 pin )
>
> to pin 4 ( unused pin ) on J1, then you can run a wire from the db9 
> plug
> pin
> 4 to a switch, open circuit for Primary mode,
>
> Ground/neg for Secondary mode. works with the tt3p but the wire on U1 
> pin
> 5
> to pin 4 on J1 is already setup on the tt3p
>
> de VK3HAU Micahel Wain
>
>>From the Owner's
> Manual................................................................
> ......
> ..........................................................
>
>
>
> Jumper J5 and J6
>
> These holes are available for input or output switches. For the 
> TinyTrak4 APRS Tracker, J5 is SW1, used to switch
>
> between primary and secondary configurations and J6 is SW2 used to 
> control power to the radio or GPS 
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