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HRD/DM780 Not Copying MT63

Mar 25th 2015, 17:46


Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
I cannot copy MT63 with this software but can do so successfully with MixW. DM780 copies all other modes fine. How do I fix this? No one on the HRD community forum has answered this.
Mar 26th 2015, 18:22


Super Moderator

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
Finally, it is critical to have your sound card calibration pretty much perfect for MT63. Follow the instructions that go with your software to check the calibration of your sound card. On receive it's a procedure involving WWV

From what I've read, FLdigi has fewer issues soundcard calibration.

Most of the time, this is only an issue for SSTV and MT63.

The problem is that the oscillator on a soundcard isn't precisely adjusted to the right frequency, as the minor inaccuracy normally isn't an issue. Worst case may be a soundcard with a drifting oscillator--while you can calibrate it, the calibration won't hold over temperature--you may need to use another soundcard.

Zack W1VT
ARRL Senior Lab Engineer

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