noise on initial tx on SSB

  • 1
  • Problem
  • Updated 3 years ago
  • Acknowledged

When initially transmitting on SSB there is a very short noise burst. Seems the tx audio buffer is active on rx and contents are being transmitted on initial transmit. This is most prevelant with stations that have mics that pick up background noise (amps, fans, etc)

Maybe easiest way to get rid of it is to have the tx audio buffer flushed on rx to tx transition?


Dave, wo2x


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David Decoons wo2x, Elmer

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Posted 5 years ago

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Tim - W4TME, Customer Experience Manager

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Is this on the monitored audio or the transmitted RF (or both)?
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David Decoons wo2x, Elmer

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Both. Seems the mic is picking up ambient noise in the room and buffering. (Rx noise, fans, etc) then on tx there is a quick burst of noise on rx.


By adjusting mic gain, compression, and external eq equipment you can reduce mic sensitivity to where it is neglible but the problem still exists. Tx audio buffer needs to be flushed on rx to tx transition.


Dave

wo2x
(Edited)
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Tim - W4TME, Customer Experience Manager

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Official Response
This is a previously reported issue and we have a bug report on it.  I just wanted to make sure it was the same issue as previously reported.
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David Decoons wo2x, Elmer

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No problem. It had been mentioned a while back that it was to be fixed in 1.2 release.

Thanks
Dave
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K2CB Eric Dobrowansky

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Will it finally be fixed in 1.5?
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Rick - N4RZ

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I am getting this problem on version 1.7 using both a Maestro and SmartSDR.  Other than using headphones is there any known fix? 
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Ken - NM9P

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I have found that It is greatly reduced in SSDR by correctly adjusting your DEXP, which keeps the noise out of the TX audio buffer in the first place. DEXP is not implemented in Maestro yet....
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K2CB Eric Dobrowansky

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Flex - please finally address this issue - will it ever be fixed, or is it a hardware limitation?


This has been ongoing for many releases now. It was offically stated that it would be addressed in an earlier release, but immediately reported by users that in fact it still occurs after said release. Prior inquiries to the issue (above) have NOT been answered.
(Edited)