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> I know I could mod the receiver to pull flat audio directly from the Group delay is more difficult to measure, and I wouldn't go down that route until all other issues have been ruled out. sweep from a few Hz up through 3 kHz at 1.5 kHz deviation). You can rule out frequency response easy enough by sweeping with analog test equipment (i.e. You might be able to get a handle on transmit delay by keying on/off an audio source into the transmitter and using a 2-channel scope (or similar) to measure the delay, then adjust DMRdelay accordingly. subscriber radio is receive-only mode), but does matter when the subscriber radio transmits into the repeater. Transmitter audio delay doesn't matter when transmitting network traffic (i.e. Delay/sync would be where I would look first. There may be audio issues to be considered, but whether or not that's the problem you're having is hard to say. You should be seeing *something* in MMDVMhost I would think. If the DMR indicator on the modem comes on, them the modem is decoding. > The board’s DMR light does come on while receiving DMR. > instructions) very carefully adjusted both the single-turn RX pot as well as the multi-turn pot, and while D-STAR RX was easy to get working, I cannot get DMR RX to work. I absolutely would not have found the solution without your help. Thanks to you, Jeff, and eve ryone who posted. I imagine some clubs with an XPR8400 in DMR service who want to try MultiMode might be interested in the details. I’ll write up the basics in case someone else wants to use this repeater for MultiMode. So I then tuned the RX pots until it reliably hears DMR. MMDVMHost noticed the incoming DMR transmission for the fi rst time at 160 and a bit better at 157. Then testing DMR, I started with DMRdelay of 165 and walked down to 1 55. I re-tested D-STAR and got the RX pots optimized. It appears the XPR8400 has a similar receive architecture. DMRDelay is how you tell MMDVM about this delay so that the subscriber can properly synchronize to the repeater. Since DMR is TDMA, it is critical that the time a DMR burst was received to the time it is retransmitted is synchronized. This creates a delay in the audio path as the ADC and DAC actions come with a small time penalty of around 7ms. The 2nd IF is digitized into PCM data, and the digital information is sent from the receiver to the SCM (system control module), where it is converted into an analog signal in CODEC #5. The MTR2000 does not have an analog FM detector. The big one, and this one is absolutely critical, is to set the DMRDelay to a number around 165.
It is about the very same problem with the Motorola MTR2000 repeater: I did find this article by Cort N0MJS useful:
I don't have proper test equipment, so was forced to go with trial and error. Default is 0, but for this repeater, 157 allows it to work, and t he XPR8 400 can now handle both DMR and D-STAR.