FYI - GPS

[OK1TK]

Hello everybody,

In the link there are some tips for those who want to try to mount a new GPS antenna on the RT3s.

https://drive.google.com/file/d/1qomyZf ... sp=sharing

Some pictures with higher resolution
https://drive.google.com/file/d/1-G001m ... sp=sharing

I hope I have contributed something useful

Good tests and good Qsos
73s

Hi, looks like the first link doesn't work anymore. May I ask you if you can share the guide again, please ?
Thank you Tomas

Hi,
New link
https://drive.google.com/file/d/1-_22eY ... sp=sharing
Cheers
73s
CU7AAZ Duarte

Thank you so much. Can I use it for the GPS version as well ?
73! Tomas

[VK4MWL]

Hi, Like many I have been dissatisfied with the GPS performance. Based on some info in this post I have replaced the "Jumpstar JS-H210" module that came with the radio with an "ATGM336H-5N31" module. I did not change the antenna or any other components in the radio.

I'm now getting a cold start GPS position in about 45 seconds outdoors, which is a big improvement.

The module is a direct replacement.

Here is the Aliexpress link to the chip.
https://vi.aliexpress.com/item/10050069 ... pt=glo2vnm

I masked of the surrounding components with Kapton tape and used a hot air station to remove the chip old chip. Then some solder wick and alcohol to clean up the pads. Then soldered the new chip on.

Mike VK4MWL

[CU7AAZ]

Hi, looks like the first link doesn't work anymore. May I ask you if you can share the guide again, please ?
Thank you Tomas

Hi,
New link
https://drive.google.com/file/d/1-_22eY ... sp=sharing
Cheers
73s
CU7AAZ Duarte

Thank you so much. Can I use it for the GPS version as well ?
73! Tomas

Yes.
Just remove the module that comes on the PCB
Best 73s!
Cheers
CU7AAZ

[M7KYD]

I would love to extend my thanks to EA5JOP and EA5JOQ for their amazing guide for GPS on this handheld. I have followed the guide without issue and it looks perfect, can identify many satellites with good signal relatively quickly. However it never can get a lock, even after 20 mins in the same position. It doesn’t seem to make a difference whether it’s inside or outside, the signal strengths are the same just no lock. I’ve attached photos of my build and the gps screen.

73’s M7KYD

https://imgur.com/a/AikJYQZ

[CU7AAZ]

I would love to extend my thanks to EA5JOP and EA5JOQ for their amazing guide for GPS on this handheld. I have followed the guide without issue and it looks perfect, can identify many satellites with good signal relatively quickly. However it never can get a lock, even after 20 mins in the same position. It doesn’t seem to make a difference whether it’s inside or outside, the signal strengths are the same just no lock. I’ve attached photos of my build and the gps screen.

73’s M7KYD

https://imgur.com/a/AikJYQZ

Nice Job!
Cheers!

[TA1ECA]

I disassembled my radio to install a GPS module in my Non-GPS UV390. The inside of the radio is very small. There are terminal pads to install the GPS chip, but I couldn't find a place to mount the GPS antenna.
Is there anyone on the forum who has managed to install a GPS module and GPS antenna in the UV390? If so, I would appreciate it if you would share how you did it.

Cheers, 73

[CU7AAZ]

I disassembled my radio to install a GPS module in my Non-GPS UV390. The inside of the radio is very small. There are terminal pads to install the GPS chip, but I couldn't find a place to mount the GPS antenna.
Is there anyone on the forum who has managed to install a GPS module and GPS antenna in the UV390? If so, I would appreciate it if you would share how you did it.

Cheers, 73

Hi

This topic has all the information you need to know.
Cheers!