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juribeparada / MMDVM_HS

MMDVM HotSpot: firmware for ZUMspot or MMDVM_HS based boards (D-Star, DMR, YSF, P25, NXDN and POCSAG)
GNU General Public License v2.0
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loopback problem with 1 MMDVM_HS as remote gateway for fusion repeater #132

Open DU8BL opened 3 years ago

DU8BL commented 3 years ago

loopback problems on single MMDVM_HS (separate TX/RX freq but same band) acting as a remote gateway for fusion repeater. everything works fine but sometimes the MMDVM_HS will rx back to the network the tx of the repeater, any option to disable rx while tx is going for the MMDVM_HS? or drop it when it receives back what it transmitted?

DL7CG commented 3 years ago

I can confirm that. The fusion repeater delays the transmission a bit, and the MMDVM_HS receives the last part of it's own transmission. The solution for this is to set the "TXHang" parameter in the MMDVM.ini. The MMDVM will then keep the TX on for a short period of time, preventing itself from receiving nonsense.

Unfortunately the current MMDVM_HS doesn't support the parameter. Please compare the "process" method here: https://github.com/g4klx/MMDVM/blob/master/YSFTX.cpp and here: https://github.com/juribeparada/MMDVM_HS/blob/master/YSFTX.cpp

The writeSilence call is missing in MMDVM_HS. This would solve the problem ...

Best wishes

Carsten DL7CG