MMDVM-Teensy not decoding from DR-1X

Help with other MMDVM Repeater Boards (with NO onboard RF)
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kd7dk
Posts: 2
Joined: Wed Jan 02, 2019 7:27 am

MMDVM-Teensy not decoding from DR-1X

Post by kd7dk » Wed Jan 02, 2019 9:21 pm

I recently purchased the MMDVM-Teensy with a cable for a DR-1X to create a DMR repeater configuration. I got it connected this past week and the transmit side works great as tested with MMDVMCal and a spectrum analyzer. On receive, I get no indication that its decoding anything. I have used an oscilloscope to confirm that I am getting clean receive audio at the RX Audio and ADC test points. Audio level measures about 2.4v peak to peak centered on 2.8v. Signal looks clean. This signal is from a HP8920B with a deviation of 2.7KHz.

Any tips on debugging this? I would love to get some more diagnostics out of the Arduino.

-Doug-, KD7DK

kd7dk
Posts: 2
Joined: Wed Jan 02, 2019 7:27 am

Re: MMDVM-Teensy not decoding from DR-1X

Post by kd7dk » Thu Jan 03, 2019 4:44 pm

Resolved. A quick reply from Mark at Micro-Node indicated that you need to set both RX and TX invert in the MMDVMHost configuration. Once I did that it worked first time. Also minor correction, my input signal is 2.4v p-p centered on 1.6v as measured at the ADC testpoint.

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