OpenGD77

Posted: **Sun Aug 02, 2020 10:15 am**

G4EML wrote: ↑
Sun Aug 02, 2020 10:02 am
The internal AFC of the ADF7021 does not work correctly with pulsed TDMA signals as used by DMR. In fact the chip struggles to lock on these signals with or without AFC. Hence the need to fine tune the frequency to minimise the errors.

Colin

Thanks for the info.

Posted: **Mon Aug 03, 2020 1:05 am**

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

Posted: **Mon Aug 03, 2020 5:14 am**

You may want to change the orientation of the 2 antennas on the hotspot, because it stands those 2 antenna are oriented for maximum coupling of the Tx to the Rx.

Posted: **Mon Aug 03, 2020 6:50 am**

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

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

OpenGD77

[Solved] Pi-Star cannot receive OpenGD77's signal

Re: [Solved] Pi-Star cannot receive OpenGD77's signal

Re: [Solved] Pi-Star cannot receive OpenGD77's signal

Re: [Solved] Pi-Star cannot receive OpenGD77's signal

Re: [Solved] Pi-Star cannot receive OpenGD77's signal