[OZAPRS] TT3 and a fm900 radio

Scott Evans scott at vk7hse.hobby-site.org
Tue Jun 23 12:26:27 EST 2009

Hi, you may want to check out the TT4 wiki that I host as a point of
reference for the pin outs for the TT4 unit. 

http://www.vk7hse.hobby-site.org/wiki/index.php/Main_Page or for the pin

Also here is a good pictorial of the FM-900 DIN pin out (saved me
scaning the FM-900 service manual!)


And if all else fails! you could try posting to the TT4 yahoo list at...

http://groups.yahoo.com/group/TinyTrak4/  (need to join the group

> Hello
> Thanks for the email and the file
> My friend went to the dayton hamfest and was supposed to bring home a TT3 
> for a few of us
> When he was at the stall, he said everyone was purchasing the TT4 and 
> thinking in buying the TT3 for us
> he was doing wrong seeing the TT4 was the latest he bought the TT4
> So the ideas we have been working on and thinking we have it all right and 
> ready to go
> now has been blown out of the water, no a whole new learning curve is about 
> to begin
> searching the net etc to find out what this TT4 does that the TT3 doesnt.
> We have fm900 radios programmed with the control heads and ready to go
> Well we thought we did
> 73 David
>   VK3EW
> At 08:36 PM 21/06/2009, you wrote:
> >David,
> >         This is what I did, circuit is courtesy of a VK7 as noted.
> >
> >Regards,
> >Gordo VK4VP
> >
> >-----Original Message-----
> >From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] On
> >Behalf Of David McAulay
> >Sent: Wednesday, 17 June 2009 15:39
> >To: ozaprs at aprs.net.au
> >Subject: [OZAPRS] TT3 and a fm900 radio
> >
> >
> >Hi All
> >Wonder if someone maybe able to help please.
> >A couple  of us here in VK3 have ordered the tt3 from the usa, and in
> >prepartion are trying to make up a cable to suit a fm900 radio using the 8
> >pin din on the back of the radio. We propose to use the middle pin which  is
> >not connected at present to supply 12v to the tt3. The gps we propose to use
> >is a 12v unit Looking at the tt3 web pages and cicuits between us we are
> >still confused on what pins of the tt3 db9 we use
> >
> >and to what pins of the fm900
> >Im sure someone has done it
> >
> >Could I ask you share this please with me
> >
> >Thank you
> >
> >All replies appreciated
> >
> >73 David VK3EW

Scott Evans VK7HSE
Phone: +61362291658
Mobile: +61417586157
Skype: vk7hse
scott at vk7hse.hobby-site.org
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