Interesting Discovery When Setting Dexpander Level

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  • Updated 2 years ago
Does anyone notice an apparently high noise level on their transmit panadaptor when keying the radio in SSB mode?  This apparent "noise" causes no RF output whatsoever.  It just shows up on the Panadaptor.  I am running a 6300, SSDR 1.9.13 on Windows 10 and a boom mounted PR781.  I am using the 20db mic boost, processing is set to "DX" and mic gain is set to 65.

Seeing this apparent noise, I assumed that my shack had a relatively high ambient noise level (ALS 600 amplifier), I formerly set the Dexpander relatively high in order to eliminate this "noise" shown on the Panadaptor.  Listening to my audio through the monitor and headphones showed little of any ambient noise.  I still use the Dexpander but adjust it to eliminate what little ambient noise there is.  Setting the Dexpander while listening through the monitor results in a much lower setting and more punchy audio.

Any thoughts?
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Bill Roberts

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Posted 2 years ago

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Tim - W4TME, Customer Experience Manager

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This is normal.  Look at the signal level of the noise.   I suspect it is VERY low.
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Bill Roberts

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Yes, shows virtually no RD output. Still, it is confusing. I was a bit concerned because my 6300 h d to go back to Austin for an internal noise mitigation mod.
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Tim - W4TME, Customer Experience Manager

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The noise issue on the 6300 was an issue with the audio input ground.
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EA4GLI - 8P9EH - Salvador

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Thanks for letting us on know. Bad contact on the audio plug?
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Bill Roberts

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Thanks for the clarification.
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Ross - K9COX

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