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Baofeng DM-1801
Posted: Sun Nov 17, 2019 9:21 am
by iw0dt
Buongiorno Roger, volevo sapere se il DM-1801 può funzionare con il firmware OpenGD77 come Hotspot.
Grazie
Re: Baofeng DM-1801
Posted: Sun Nov 17, 2019 2:44 pm
by k8upe
Translation:
Hello Roger, I wanted to know if the DM-1801 can work with the OpenGD77 firmware as a hotspot.
Thanks
Re: Baofeng DM-1801
Posted: Sun Nov 17, 2019 7:47 pm
by VK3KYY
DM-1801 looks similar on the outside, but if you take the radio apart you will find it’s not the same hardware
It uses a slightly different CPU the main PCB is completely different , hence the firmware won’t run on this or any other radios
It won’t even run on the GD-77S,
Re: Baofeng DM-1801
Posted: Sun Dec 01, 2019 10:11 pm
by VK3KYY
BTW.
If anyone has a schematic diagram for a DM-1801 it would probably be possible to modify the OpenGD77 firmware to work with that radio, but I can't find a schematic for it anywhere
Re: Baofeng DM-1801
Posted: Sun May 03, 2020 10:09 am
by ok3js
The problem with the falling hotspot openGD77 on DM1801 and the freezing MMDVM (also Pi-star) solved, it is RF performance.
Everything works OK up to 500mW, at 750mW and above it freezes. Apparently a HF signal is induced into the USB cable and kills the Pi Zero process.
I'll put on a ferrite cable and see what's next.
---------------------------------------------------
Problém s padajícím hotspotem openGD77 na DM1801 a zatuhávajícím MMDVM (i Pi-star) vyřešen, je jím RF výkon.
Do 500mW vše pracuje OK, u 750mW a výše dojde k zatuhnutí. Zřejme se indukuje do USB kabelu VF signál a umrtví proces Pi Zero.
Osadím kabel ferity a uvidím co bude dál.
Re: Baofeng DM-1801
Posted: Sun May 03, 2020 10:19 am
by F1RMB
Hi,
ok3js wrote: ↑Sun May 03, 2020 10:09 am
The problem with the falling hotspot openGD77 on DM1801 and the freezing MMDVM (also Pi-star) solved, it is RF performance.
Everything works OK up to 500mW, at 750mW and above it freezes. Apparently a HF signal is induced into the USB cable and kills the Pi Zero process.
I'll put on a ferrite cable and see what's next.
---------------------------------------------------
Problém s padajícím hotspotem openGD77 na DM1801 a zatuhávajícím MMDVM (i Pi-star) vyřešen, je jím RF výkon.
Do 500mW vše pracuje OK, u 750mW a výše dojde k zatuhnutí. Zřejme se indukuje do USB kabelu VF signál a umrtví proces Pi Zero.
Osadím kabel ferity a uvidím co bude dál.
Yes, that's a well known problem.
Also, if you want more coverage or using more power, an external antenna is the way to go.
Cheers.
---
Daniel
Re: Baofeng DM-1801
Posted: Sun May 03, 2020 1:08 pm
by ok3js
Yes, an external antenna will probably solve it.
I have for more than a month ordered from AE 5m pigtail SMA - PL259 and 3 el. yagi antenna.
I'm waiting for delivery.
It is pleasant to cover the surroundings with 500mW, it is much better than 10mW with a small mmdvm hotspot.
Re: Baofeng DM-1801
Posted: Sun May 03, 2020 2:39 pm
by EB3AM
I bought a baofeng dm-1801 with the intention of using it as a hotspot, but the operation is very bad. As you say it kills the connection with the raspberry, which is not the case with radioddity.
I ran the hotspot with 4w and outdoor antenna a long time with the GD77, no problem. But the Baofeng, above 500mW is impossible to run for an hour straight.
Re: Baofeng DM-1801
Posted: Sun May 03, 2020 2:56 pm
by LY1RF
No problem with my 1801, pi2 and diamond x200 external antenna - hotspot works all day at any power you set it, 5w too...
Maybe try to change usb cable, or rpi power adapter...
Re: Baofeng DM-1801
Posted: Sat May 09, 2020 8:08 am
by ok3js
