OpenGD77

Could you also supply backup power to the GPS module, this would improve the time to achieve GPS lock considerably Perhaps a resistor and a zener diode from the main battery or a low power 3.3V regulator, or perhaps a connection to the MCU backup/RTC battery I've done a lot of testing of new GPS an...

Excellent job! The house for the new antenna was excellent :!: I just had a doubt, did you remove the rf amplifier from the new antenna and put it on the radio pcb? I'm happy with your results. Thanks for sharing the mod Best 73s CU7AAZ Yes, I try to combine two schemes. It's amazing. I want to ale...

CU7AAZ and UB3AYH proposes the scheme is very exciting. Thanks for sharing ! I used the antenna they recommended Transform active antenna into passive antenna, installed on top of the radio. Replaced with AL5 radio frequency amplifier. Positioning can be completed within one minute after booting(Out...

Thanks for reminding!
Another knowledge blind spot.
I have adjusted.

I found a duplex board using ceramic antenna. How about this?

My devices are working fine.
Bit Error Rate <0.5%
Thanks everyone for your help!

Note that the Pi-Star running on "JumboSpot" hardware (with one of the radio "hat" boards on a Raspberry Pi) have a Software defined Radio chip without Automatic Frequency Control implemented. This means that the fine adjustment of the center of the radio's reception frequency is necessary, and the...

This is normal. I can't use my MD-380 and GD-77 on the same hotspot, even running the official firmware on both radios, also my Baofeng DM-1801 doesn't work with any of my hotspots unless I significantly change the settings in the hotspot. You could try adjusting the calibration, Reference Oscillat...

Hi Marko Thank you for your help! I uesd “pistar-mmdvmcal”, and calibrated my Pi_Star(RXOffset 600). It can receive calls from MD760. But now it cannot receive MD380's calls. Restore configuration to 0(RXOffset 0 and TXOffset 0), MD380 Works very good. So, the frequency of MD380 and the simplex boar...

Hello， My Radio is TYT MD760(As same as Radioddity GD-77). Used D20200628 OpenGD77 firmware. The Simplex board is MMDVM_HS Hat for the Raspberry Pi. When I pushing the PTT, The Radio is trying to connect the simplex board. But the simplex board does not respond, and the LED light is not on. I used a...