Saturday, May 16, 2015

Please Control The ALC!

This is how a bad case of splatter looks like in JT9 waterfall.

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There is very simple solution for this. I have been educating this to everyone who I have introduced to digital modes.

Step 1: If you have option in your rig to turn ALC (Audio Level Compression) off please do so for ALL digital modes!

Step 2: If you can not turn ALC off you need to set the audio level low enough for ALC not activating and power still going out to the antenna system.

I have found that easiest way to control ALC is with the option: MIC GAIN in my rigs.

This is how perfectly set mic gain looks on the ALC and Power meter:

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About 20 watt going out, Zero ALC activation. You need to explore what is correct mic gain for your audio level.

Here is the same for Yaesu 1000mp.

 

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You can see no ALC activation on the ALC meter.

Please clean up your signals!

 

Toni oh3t

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