Squelch Tail at Begining of SSB Maestro Transmissions

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  • Updated 3 months ago
My station consists of a 6600M, PG and Maestro for remote operation. Latest firmware updates.

While using the Maestro barefoot on my home LAN in the SSB mode I have been told every time I push to PTT the voice audio is proceeded by a “rushing“ sound much like a squelch tail sound. I am using a RE-27 and the PTT inputs located at the rear of the Maestro.

Some experimentation revealed when I increase the TX delay the problem gets better. unfortunately I have to increase the delay to 450 ms!

In addition I am connected by WiFi with “excellent” as reported by the Network monitor on the Maestro.

I do not have this experience with the radio while using the 6600M while in the shack, nor on the iPad while on LAN or Remote.

A friend of mine and I were speculating as to the root cause. It is as if the PTT is arriving at the radio server and the audio buffer arrives filled with noise. I have been told experience was a identified some time ago during general SDR development on “thick” client development.

Any input would be appreciated.

Howard
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Howard K2AQ

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Posted 3 months ago

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WW1SS - Steve

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Where is your dexp set at???
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Howard K2AQ

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Can’t adjust via Maestro, correct??
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Howard K2AQ

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60
(Edited)
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Howard K2AQ

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Have to try that
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Howard K2AQ

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Set at 60 Steve
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WW1SS - Steve

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Try turning it down to 0 or off and see if it goes away. I never even have mine on.
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Howard K2AQ

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Dave. It does not do it under the configuration you suggested. Still have the problem with Maestro.
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David Decoons wo2x, Elmer

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ok, what's different, besides the Maestro? Same mic? Settings? Processor or 20 dB boost?

I found the level meter on the Maestro does not show properly. If you adjust your audio using it then you will be overdriving and also making the mic more sensitive to pick up receiver noise which gets buffered on beginning of transmission.

I use the Maestro with an FHM-2 hand mic into MIC1, the RadioSport traveler headset and RadioSport RS-60CS headset using the M350 element.

Dave wo2x
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W9WLX-Chuck

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This is likely the known issue cause by the TX buffer dump when starting Xmit. 
https://community.flexradio.com/flexradio/topics/noise-burst-on-transmit?topic-reply-list%5Bsettings...

Using DEXP will take care of it, but the mic needs to be physically connected to the radio, not the Maestro, in order for DEXP to be available.

Chuck
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Howard K2AQ

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Thanks for this input Chuck. But WOW, this is a problem. This sound is not insignificant. Using the Marstro with this is a problem.