It would be impossible the fit a GPS module inside the case of the radio, but you could fit a GPS on the outside and drill a hole through the case for the power, the and data wires
GPS (GP-02) kit module fitted in a GD-77
Re: GPS (GP-02) kit module fitted in a GD-77
Hi GP-02 people, I have two stupid questions. I'm trying to add GP-02 into DM-1701.
The First one, where is PA9 and PA10. The STM32 Chip has two mark on it. I believe the mark on the lower right is the real mark and the one on the top left is a fake one. If I'm right that means PA10 and PA9 are on the left side of the photo, Pin 7 and 8 counting from the bottom. Can anyone confirm this for me please.
The second one, I'm planning to put the GP-02 underneath the volume and channel selector. I will use N-MOS (SI2300) to switch on the Ground side of the GP-02. Ground is easy, However, my stupid question is where can I get Vcc (3.3V) in this area?
Thank you in advance,
Charlie,
The First one, where is PA9 and PA10. The STM32 Chip has two mark on it. I believe the mark on the lower right is the real mark and the one on the top left is a fake one. If I'm right that means PA10 and PA9 are on the left side of the photo, Pin 7 and 8 counting from the bottom. Can anyone confirm this for me please.
- IMG_2068.jpg (171.79 KiB) Viewed 1959 times
The second one, I'm planning to put the GP-02 underneath the volume and channel selector. I will use N-MOS (SI2300) to switch on the Ground side of the GP-02. Ground is easy, However, my stupid question is where can I get Vcc (3.3V) in this area?
- IMG_2069.jpg (162.54 KiB) Viewed 1959 times
Charlie,
Re: GPS (GP-02) kit module fitted in a GD-77
BTW, we finished the project successfully in Baofeng DM-1701.BD4SMY wrote: ↑Sat Jan 27, 2024 10:05 amI also want to add gd-02 module in my Baofeng DM-1701B (like Retevis RT-84), but I don't know how to connect the wire. Is there anybody could help me? Thanks a lot!
Because I can only load the pictures which size is less than 250KB, maybe the chips' model is not very clear. The following is the details:
MCU -- Geehy-APM32F407VGT6
Modem -- Hongrui HR_C6000
RF -- AUCTUS AT1846S
ROM -- Winbond-W25Q128JVSIQ
As the detail, FYI. viewtopic.php?f=19&t=4800&start=10
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Re: GPS (GP-02) kit module fitted in a GD-77
I have successfully put GP-02 module into my DM-1701. I decided to use the module, not kit, without backup battery. I might add a battery in the future, but the GPS cold boot takes only less than a minute, so I'm satisfied for now.
The N/F pin on the module is function perfectly. on a bench top power supply the module takes 18 mA when N/F is high and 0 mA when N/F is low. So I decided not to use N-MOS.
wiring details
3V3 (RED) <--> PIN 8 of Flash memory chip
GND (BLACK) <--> PIN 4 of Flash memory chip
N/F (GREEN) <--> Pin 8 (PA9) on the left side counting from the bottom of the STM32 chip
TX (YELLOW) <--> Pin 7 (PA10) on the left side counting from the bottom of the STM32 chip
Before modification
After modification, overview
The N/F pin on the module is function perfectly. on a bench top power supply the module takes 18 mA when N/F is high and 0 mA when N/F is low. So I decided not to use N-MOS.
wiring details
3V3 (RED) <--> PIN 8 of Flash memory chip
GND (BLACK) <--> PIN 4 of Flash memory chip
N/F (GREEN) <--> Pin 8 (PA9) on the left side counting from the bottom of the STM32 chip
TX (YELLOW) <--> Pin 7 (PA10) on the left side counting from the bottom of the STM32 chip
Before modification
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- overview.jpg (119.99 KiB) Viewed 1595 times
Last edited by KA1CM on Tue May 13, 2025 12:18 pm, edited 2 times in total.
Re: GPS (GP-02) kit module fitted in a GD-77
GP02 module with 4 wires. double-sided taped to a SOIC8 (I believe it is an op-amp, bot not so sure)
Tap 3V3 and GND from Flash memory chip, kinda stupid, but it works!!!
Finally!!!!
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Re: GPS (GP-02) kit module fitted in a GD-77
Cool.
If you are using a bare-bones GPS module, you should consider using one which supports other GNSS constellations, as the GP-02 does not support Galileo or GLONASS
If you are using a bare-bones GPS module, you should consider using one which supports other GNSS constellations, as the GP-02 does not support Galileo or GLONASS
Re: GPS (GP-02) kit module fitted in a GD-77
Hi Roger,
The GP-02 can be configured to use GLONASS instead of BDS. I will try this configuration for my second 1701.
The GP-02 can be configured to use GLONASS instead of BDS. I will try this configuration for my second 1701.
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Re: GPS (GP-02) kit module fitted in a GD-77
BDS is probably better than GLONASS, so there is no point in changing to GLONASS
Newer generations of GPS support 3 or more GNSS systems concurrently
Re: GPS (GP-02) kit module fitted in a GD-77
Re: GPS (GP-02) kit module fitted in a GD-77
I'm not sure which M10 generation modules would fit inside a dm1701.
Virtually all modules listed on AliExpress etc, as M10 generation have the same chipset in them
I use Quescan branded modules in my md9600, but other brands perform about the same.
I think the variation in performance is mostly related to the antenna size