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Re: FYI - GPS
Posted: Fri Oct 20, 2023 6:33 pm
by CU7AAZ
SA0BUX wrote: ↑Fri Oct 20, 2023 4:13 pm
i5ekx wrote: ↑Fri Oct 20, 2023 10:44 am
Questo il risultato:
That's the other antenna?
Link to supplier.?
Hello Friend!
Two mods
Mod 1
Just active antenna link-
https://pt.aliexpress.com/item/10050042 ... pt=glo2bra
https://drive.google.com/file/d/1qomyZf ... sp=sharing
Mod 2
https://drive.google.com/file/d/1VrMJm0 ... sp=sharing
I hope your doubts have been clarified
Best 73s
CU7AAZ
Re: FYI - GPS
Posted: Fri Oct 20, 2023 7:23 pm
by VK3KYY
FYi.
I have compared the accuracy of the AGTM336 and the GP-02 GPS modules and the GP-02 seemed to be slightly more accurate
The official GPS was branded JumpStar , but we do not know what brand or model of GOS is fitted to the newer radios.
The JukpSar module is worse than the AGTM336 or GP-02
Re: FYI - GPS
Posted: Tue Oct 31, 2023 12:45 pm
by PU2RMT
Good morning!!
Finally my kit. It arrived, I made that cutout in the housing to house the GPS antenna, but the back of it has that metal shield and I can't close the radio because of it, is there any risk of reducing sensitivity or causing interference if I remove it? the shield?
Re: FYI - GPS
Posted: Tue Oct 31, 2023 1:01 pm
by CU7AAZ
PU2RMT wrote: ↑Tue Oct 31, 2023 12:45 pm
Good morning!!
Finally my kit. It arrived, I made that cutout in the housing to house the GPS antenna, but the back of it has that metal shield and I can't close the radio because of it, is there any risk of reducing sensitivity or causing interference if I remove it? the shield?
Hello
You can remove the metal shield. and place insulating tape or kapton tape
73s
CU7AAZ
Re: FYI - GPS
Posted: Wed Nov 01, 2023 9:10 am
by EU1AEQ
I want to note that when installing a GPS kit, there is no need to make a cutout in the housing to accommodate a GPS antenna. The sensitivity is sufficient to place the antenna in a regular place. I also removed the antenna connector from the board and shortened the coaxial cable. The cable was soldered directly. The board is placed to the right of the speaker. Do not place the antenna close to the socket, so as not to break the inductance during assembly. I sawed off the antenna mounting pad on the board.
viewtopic.php?f=19&t=2415&sid=56475089d ... =90#p26889
Re: FYI - GPS
Posted: Wed Nov 01, 2023 9:54 am
by SA0BUX
EU1AEQ wrote: ↑Wed Nov 01, 2023 9:10 am
I want to note that when installing a GPS kit, there is no need to make a cutout in the housing to accommodate a GPS antenna. The sensitivity is sufficient to place the antenna in a regular place. I also removed the antenna connector from the board and shortened the coaxial cable. The cable was soldered directly. The board is placed to the right of the speaker. Do not place the antenna close to the socket, so as not to break the inductance during assembly. I sawed off the antenna mounting pad on the board.
viewtopic.php?f=19&t=2415&sid=56475089d ... =90#p26889
This is the active antenna ?, I presume it has power feed via the coax ?
Does the radios with factory installed GPS also have an active antenna or do you need to add some power feed if you replace the original antenna ?
Re: FYI - GPS
Posted: Wed Nov 01, 2023 10:06 am
by EU1AEQ
SA0BUX wrote: ↑Wed Nov 01, 2023 9:54 am
This is the active antenna ?, I presume it has power feed via the coax ?
Does the radios with factory installed GPS also have an active antenna or do you need to add some power feed if you replace the original antenna ?
There was no GPS installed in my radio station. I installed a kit with an active antenna.
Re: FYI - GPS
Posted: Tue Nov 07, 2023 9:00 pm
by PU2RMT
I installed the antenna at the top but I had removed little plastic and when it was time to close the radio I broke the porcelain of the antenna, I only noticed because the reception was very bad in the open, I disassembled everything again glued the porcelain of the antenna with super glue and redid the metal part with tin, I removed more plastic, I mounted everything, now it finds satellite even inside the house.
Re: FYI - GPS
Posted: Tue Nov 14, 2023 11:44 pm
by AA3RP
CU7AAZ wrote: ↑Tue Jan 24, 2023 8:55 pm
EA5JAQ wrote: ↑Tue Jan 24, 2023 9:53 am
CU7AAZ wrote: ↑Mon Jan 23, 2023 11:04 pm
Hello everybody!
Finally!
New GPS antenna installed. Excellent results!
28db antenna, installed on top of the radio.
When activating the gps, in one minute the gps starts to receive the satellites.
Amazing, I wasn't expecting it. Indoors, he obtained 9 satellites. (And with the exact location of my house)
It took a lot of work but I'm happy with the result.
73s everyone
CU7AAZ
That sounds great! Could you please post the part number or link of the antenna? I definitely wanna try it out
Thank you, 73!
It's amazing. I want to alert friends that the antenna is active. This dear RT3S uses a passive gps antenna. But no problem, to make the work easier, I advise you to remove the pcb components and then connect the small coax directly to the (positive) of the antenna and of course not forgetting the ground.
Link
https://www.amazon.de/-/en/Antenna-Cera ... 278&sr=8-1
Good Luck
73s!
The link to the antenna in the post is now showing they are no longer in stock. I found another amazon listing (US) that has the same antenna listed
https://www.amazon.com/Antenna-Ceramic- ... B09WVTB9VT
Also found a link on AliExpress for them as well
https://www.aliexpress.us/item/32568040 ... US%21%21AB
I hope this helps anyone trying to find them.
Re: FYI - GPS
Posted: Sun Nov 19, 2023 12:46 am
by AE7GQ
I bought an RT3S 2 weeks ago on Amazon. Same Jumpstar gps chip as the earlier versions.
Nice thread on improving the GPS signal reception.
I pulled apart a AT878UV that I had and the GPS antenna is mounted at the top of the radio pointing up. Same adhesive holding it in place. There is a better connection to the ground side on the AT878 that pushes/cuts into the adhesive backing.
73,
AE7GQ - Michael