TYT MD-9600, add GPS later?

N1KY
Posts: 81
Joined: Sun May 24, 2020 10:46 pm

Re: TYT MD-9600, add GPS later?

Post by N1KY » Sun Dec 11, 2022 11:09 pm

Nice work Roger! Actually sounds like fun. I have a tube of MC1489s left over from the old days and they are always perfect for those unexpected RS232 <-> TTL conversion needs. :D

VK4MWL
Posts: 22
Joined: Mon Jun 01, 2020 7:52 am

Re: TYT MD-9600, add GPS later?

Post by VK4MWL » Fri Dec 16, 2022 3:55 am

Thanks Roger for the details.

Here are the pin outs on a V2 md9600.

Red 3.3V
Brown TX from the GPS
Black GND

Mike
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VK3KYY
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Location: Melbourne, Australia

Re: TYT MD-9600, add GPS later?

Post by VK3KYY » Fri Dec 16, 2022 6:53 am

VK4MWL wrote:
Fri Dec 16, 2022 3:55 am
Thanks Roger for the details.

Here are the pin outs on a V2 md9600.

Red 3.3V
Brown TX from the GPS
Black GND

Mike
Thanks for the photo.

I used a different pad for GND, but the others are the same.

I use hot glue to hold the wires to the PCB to act as strain relief, as I am always worried about pulling pads off PCBs.

Did you drill a hole in the back section of the front module of the radio, to exit the wires?

UA0LMC
Posts: 53
Joined: Thu Oct 01, 2020 6:09 am
Location: Vladivostok, Russia

Re: TYT MD-9600, add GPS later?

Post by UA0LMC » Fri Dec 16, 2022 11:43 am

VK4MWL wrote:
Fri Dec 16, 2022 3:55 am
Thanks Roger for the details.

Here are the pin outs on a V2 md9600.

Red 3.3V
Brown TX from the GPS
Black GND

Mike
As far as I can see, built-in GPS module pin 6 (Vbat) and pin 8 (Vcc) are in parallel with no battery backup - so I expect the problems similar to RT3s, where every GPS on/off cycle causes a built-in module full reset and subsequent cold start.

VK4MWL
Posts: 22
Joined: Mon Jun 01, 2020 7:52 am

Re: TYT MD-9600, add GPS later?

Post by VK4MWL » Fri Dec 16, 2022 11:07 pm

Here are some more details.

GPS is similar to https://www.aliexpress.com/item/3283434 ... 1802ejNRic

I will use an external antenna, photos show the SMA plug in the side of the front panel. Hole is just big enough to fit the SMA female connector.

GPS board is held in with hot glue.

Roger. I forgot to put some hot glue on the wires. Good idea.

Mike.
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VK4MWL
Posts: 22
Joined: Mon Jun 01, 2020 7:52 am

Re: TYT MD-9600, add GPS later?

Post by VK4MWL » Fri Dec 16, 2022 11:13 pm

UA0LMC wrote:
Fri Dec 16, 2022 11:43 am
VK4MWL wrote:
Fri Dec 16, 2022 3:55 am
Thanks Roger for the details.

Here are the pin outs on a V2 md9600.

Red 3.3V
Brown TX from the GPS
Black GND

Mike
As far as I can see, built-in GPS module pin 6 (Vbat) and pin 8 (Vcc) are in parallel with no battery backup - so I expect the problems similar to RT3s, where every GPS on/off cycle causes a built-in module full reset and subsequent cold start.
Yes I think you are correct. The GPS board I used has a backup battery so the acquisition using an external antenna was pretty quick.

VK4MWL
Posts: 22
Joined: Mon Jun 01, 2020 7:52 am

Re: TYT MD-9600, add GPS later?

Post by VK4MWL » Fri Dec 16, 2022 11:52 pm

Should the GPS also set the time on the Radio?

VK3KYY
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Joined: Sat Nov 16, 2019 3:25 am
Location: Melbourne, Australia

Re: TYT MD-9600, add GPS later?

Post by VK3KYY » Sat Dec 17, 2022 5:50 am

VK4MWL wrote:
Fri Dec 16, 2022 11:52 pm
Should the GPS also set the time on the Radio?
I did not test this, but it should be setting the time

VK3KYY
Posts: 7293
Joined: Sat Nov 16, 2019 3:25 am
Location: Melbourne, Australia

Re: TYT MD-9600, add GPS later?

Post by VK3KYY » Sat Dec 17, 2022 5:55 am

VK4MWL wrote:
Fri Dec 16, 2022 11:13 pm
UA0LMC wrote:
Fri Dec 16, 2022 11:43 am
VK4MWL wrote:
Fri Dec 16, 2022 3:55 am
Thanks Roger for the details.

Here are the pin outs on a V2 md9600.

Red 3.3V
Brown TX from the GPS
Black GND

Mike
As far as I can see, built-in GPS module pin 6 (Vbat) and pin 8 (Vcc) are in parallel with no battery backup - so I expect the problems similar to RT3s, where every GPS on/off cycle causes a built-in module full reset and subsequent cold start.
Yes I think you are correct. The GPS board I used has a backup battery so the acquisition using an external antenna was pretty quick.

The module I am using has its own backup battery.

Also

I did not want a socket on the front panel, so I used a module with its own antenna, and I have a short length of wire protruding from the back of the radio.
With an inline socket.

VK3KYY
Posts: 7293
Joined: Sat Nov 16, 2019 3:25 am
Location: Melbourne, Australia

Re: TYT MD-9600, add GPS later?

Post by VK3KYY » Mon Dec 19, 2022 8:29 am

I had not previously come across 10V RS232.

I have seen 20V RS232 using native voltages, but that was a long time ago..

The problem with the 10V signals from the module I bought was that the signal is inverted as well as being higher voltage.

If it wasn't inverted a simple voltage divider would have fixed the problem.

However 3.3V or 5V signals down a couple of meters of wire seems to be OK

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