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GPS (GP-02) kit module fitted in a GD-77
Posted: Wed Oct 11, 2023 3:05 pm
by F1RMB
Re: GPS (GP-02) kit module fitted in a GD-77
Posted: Wed Oct 11, 2023 8:42 pm
by CU7AAZ
F1RMB wrote: ↑Wed Oct 11, 2023 3:05 pm
Hi,
Here is a small hack I made on one of my GD-77.
I fitted a GP-02 tiny GPS module and a 8x8 active GPS antenna.
20231008_112626-scaled.jpg
20231008_112707-scaled.jpg
20231008_112821-scaled.jpg
20231008_174154-scaled.jpg
20231009_162141-scaled.jpg
20231011_110345-scaled.jpg
20231010_095015-scaled.jpg
20231010_095008-scaled.jpg
20231011_120310-scaled.jpg
Some screengrabs:
GD-77_screengrab-2023-10-11_16_35_02.png
GD-77_screengrab-2023-10-11_16_35_10.png
GD-77_screengrab-2023-10-11_16_11_28.png
Cheers.
---
Daniel
Wowww Daniel,
Good Job!
73s
CU7AAZ
Re: GPS (GP-02) kit module fitted in a GD-77
Posted: Wed Oct 11, 2023 9:03 pm
by VK3KYY
Daniel
Can post a link to the module and the antenna
I know the antenna is
https://www.aliexpress.com/item/1005004473774121.html
But I'm not sure of the exact GP-02 board you bought.
What glue did you use for the GPS module ? Some sort of epoxy?
Re: GPS (GP-02) kit module fitted in a GD-77
Posted: Thu Oct 12, 2023 1:50 am
by F1RMB
Hi Roger,
It's this one (with the PCB and ceramic antenna, which I removed (double-sided tape):
https://fr.aliexpress.com/item/32764345698.html
Yes, the antenna is the active one, 8x8mm, from your link (the board supports active antenna).
About the glue, it's just a bit of sanitary silicone sealant
I put some kapton tape under the board for insulation.
The power control is done using a N-Channel MOSFET (AO3400, cheap and I have plenty), and 2 resistors (300kΩ between Source and Gate, 200Ω on the Gate line).
Cheers.
---
Daniel
EDIT: resistors value updated.
Re: GPS (GP-02) kit module fitted in a GD-77
Posted: Thu Oct 12, 2023 4:07 am
by VK3KYY
F1RMB wrote: ↑Thu Oct 12, 2023 1:50 am
Hi Roger,
It's this one (with the PCB and ceramic antenna, which I removed (double-sided tape):
https://fr.aliexpress.com/item/32764345698.html
Yes, the antenna is the active one, 8x8mm, from your link (the board supports active antenna).
About the glue, it's just a bit of sanitary silicone sealant
I put some kapton tape under the board for insulation.
The power control is done using a N-Channel MOSFET (AO3400, cheap and I have plenty), and 2 resistors (100k between Source and Gate, 1k on the Gate line).
Cheers.
---
Daniel
Thanks.
I use the same GPS module , with built in antenna, on the outside of the GD77 which I modified
I have 2 of those modules with antenna, so I can easily unsolder and remove the antenna from one of those boards
I checked my other modules and they are all ATGM336H with external active antenna, but the ATGM336 modules have the battery on one side of the PCB and the GPS rx on the other wise of the PCB, which makes them too thick to fit inside the radio, as they are double the thickness of the GP02 board
Also. The performance of the ATGM336 modules seems worse than the GP-02, so I prefer to use GP-02
BTW.
Is it possible to control the power of the GPS using only one N channel FET ? I thought a N and P channel were needed, i.e this is what is in the MD9600 and probably also in the RT3S/UV380
Re: GPS (GP-02) kit module fitted in a GD-77
Posted: Thu Oct 12, 2023 5:02 am
by F1RMB
Hi Roger,
Yes, N-Channel is switching the GND of the board, not the VCC (Drain is connected to the GND of the board, Source to the main GND).
Am I wrong (I used that few times) ?.
Cheers.
---
Daniel
Re: GPS (GP-02) kit module fitted in a GD-77
Posted: Fri Oct 13, 2023 12:29 pm
by BI4VWR
你好，请问这是什么设备
Re: GPS (GP-02) kit module fitted in a GD-77
Posted: Fri Oct 13, 2023 12:54 pm
by SA0BUX
F1RMB wrote: ↑Thu Oct 12, 2023 5:02 am
Hi Roger,
Yes, N-Channel is switching the GND of the board, not the VCC (Drain is connected to the GND of the board, Source to the main GND).
Am I wrong (I used that few times) ?.
Cheers.
---
Daniel
https://www.learningaboutelectronics.co ... ircuit.php
Re: GPS (GP-02) kit module fitted in a GD-77
Posted: Wed Oct 18, 2023 6:54 am
by bg5bdt
good aftenoon
dear
Do you have a detailed wiring principle circuit diagram
Re: GPS (GP-02) kit module fitted in a GD-77
Posted: Wed Oct 18, 2023 7:06 am
by bg5bdt
F1RMB wrote: ↑Wed Oct 11, 2023 3:05 pm
Hi,
Here is a small hack I made on one of my GD-77.
I fitted a GP-02 tiny GPS module and a 8x8 active GPS antenna.
20231008_112626-scaled.jpg
20231008_112707-scaled.jpg
20231008_112821-scaled.jpg
20231008_174154-scaled.jpg
20231009_162141-scaled.jpg
20231011_110345-scaled.jpg
20231010_095015-scaled.jpg
20231010_095008-scaled.jpg
20231011_120310-scaled.jpg
Some screengrabs:
GD-77_screengrab-2023-10-11_16_35_02.png
GD-77_screengrab-2023-10-11_16_35_10.png
GD-77_screengrab-2023-10-11_16_11_28.png
Cheers.
---
Daniel
good aftenoon
dear
Do you have a detailed wiring principle circuit diagram