Having garbled MY callsign when transmitting

ko4l
New Member

Posts: 8

Having garbled MY callsign when transmitting Feb 19, 2015 20:35:03 GMT -7

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Post by ko4l on Feb 19, 2015 20:35:03 GMT -7

I am facing a strange problem. when I transmit to my new MEGA/Pi B+ (not the 2 model) combo with the Commander image, occasionally, (more often than makes it usable)

I am seeing errors when I transmit to the MEGA/Pi from across the room. I am seeing the MY Call corrupted about every other time I transmit. When I do get in the audio is 100% according to the recieving party.

I am at wits end about a fix. Have any of you seen this before? Please let me know any possible fixes...Thanks

Please look at the LOG on the D-star repeater window at the following links for what the system is showing when this error occurs.

drive.google.com/file/d/0B0nQjls0m5VJek44dTRlLWo0UkE/view?usp=sharing

drive.google.com/file/d/0B0nQjls0m5VJeGNhazFCN3U2QkU/view?usp=sharing

KO4L Lloyd

W6KD
Administrator

Posts: 419

Having garbled MY callsign when transmitting Feb 19, 2015 21:48:10 GMT -7

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Post by W6KD on Feb 19, 2015 21:48:10 GMT -7

Very likely your radio and your dvMega are slightly off-frequency from each other. The MYCALL field is sent in a part of the DStar data frame that is subject to forward error correction...for the MYCALL to be corrupted, there has to be a pretty high bit error rate, and that's usually caused by the hotspot, or the radio, or even both being off-frequency.

The DVAP has a very nice calibration utility...I am not aware of something similar for the dvMega. Maybe an e-mail to Guus is in order.

Regards

Bob (W6KD)
Colorado Springs, CO
D*STAR Hangouts:
XRF555A (persistently linked to XRF002A)
XRF720C (Colorado Front Range reflector)

ko4l
New Member

Posts: 8

Having garbled MY callsign when transmitting Feb 20, 2015 20:08:29 GMT -7

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Post by ko4l on Feb 20, 2015 20:08:29 GMT -7

Thanks Sir, I will check both my radio and the Mega board on the service monitor. I suspected that as a possible cause and waited until the Pi/Mega warmed up some. (on about 40 min) to help stablize it. Guus wanted me to also reload the pgm again...I will post my solution when I find it.

KO4Lloyd

ko4l
New Member

Posts: 8

Having garbled MY callsign when transmitting Mar 3, 2015 17:08:23 GMT -7

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Post by ko4l on Mar 3, 2015 17:08:23 GMT -7

Aha! Found the Icom IC-91ad was off freq enough on transmit to send errors from time to time. I compensated by transmitting 5kc lower than the receive freq and all is good... The radio was used to me. (bet I know why it was sold from original owner)

Time for a ID-51 in due time..

Thanks for your help. KO4L Lloyd

Last Edit: Mar 3, 2015 17:09:06 GMT -7 by ko4l