I thought about a Auto Volume Control, AVC but these tend to boost the weak stations and the noise when no one is talking. This might take the form of an upward compression function with a slider for how much it limits the loud signals.
This differs from the AGC-T in that some strong stations have weak audio and some weak stations have strong audio.
I believe this function would be really great for listening to and running a net.
On FM and AM, however, I can see that this would be very handy. I have noticed a lot of difference between modulation levels on AM and FM signals. AGC keeps the "RF" gain equal, but if you have a S9+20 AM signal with low modulation then it is very difficult to understand the station without turning up the AF volume drastically, only to be blasted by noise or the next signal when the station unkeys. Some form of audio level AVLC could be handy for these situations.
Ken - NM9P
I agree Audio limiter separate from AGC-T would be great. Since the FLEX SDR has so much dynamic range and the fact that the “AGC-T” does not work the same as a traditional “AGC” control, having an “AVC” or audio limiter/compressor would great to take advantage of this awesome dynamic range and enjoy a better listening experience
If this is not what you are after, I am confused on how this new control would interact with the existing AGC-T and volume controls.
To me this is a good idea to offer max audio level (for ear protection, not automatic)...why?
Recently I have been using AGC-T set to "off" so that I can hear some of the very very weak South Pacific DXpeds. They have often been just s0-s1 here on SSB (almost directly over the pole). Turning AGC-T off can make all the difference between just noise and just being able to copy them. Having it on at 100% (fast), or lowered to the noise floor method doesn't achieve the same result. I'd say there is still about 3db more to be had by turning it off in those ultra-weak situations.
So, why is it a problem: well, when you have AGC-T off and working split things are fine and you can squeeze that that last bit of juice out of the flex. As a keen DX chaser, I am used to straining to hear what is going on at the noise floor. But, then some muppet calls on the DX freq at s9+20 without split, and thus blows your eardrums in to the next county. I have actually had this happen twice now, and the result is severe ringing in the ears all day curtesy of some IQ0 not knowing how to use split.
Cheers, Steve G1XOW
"I think what I would suggest may actually seem counterintuitive. I would suggest that in order to protect your ears, you actually want to push the weak signals UP to the same limited signal target as the strong signals by turning the AGC-T level UP (rather than setting AGC to off). You may then need to adjust your Slice volume and/or your master volume down, but I think this will give you the protection you are looking for."
This works for me when listening for weak signals when occasional strong signals occur.
The obvious solution is the addition of a AVC (Automatic Volume control), Audio Limiter, Compressor what every you want to call it but it is separate from the AGC-T control.When I have time I will grab one of my Audio limiters connect it to the Audio output on the back of the flex then out to the speakers and demonstrate how this works and is DIFFERENT FROM USING THE AGC-T CONTROL.
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