Rick and Jon, Personally, I think it has to do with non-linearity of the
amp. I will try to explain: if the basic signal is produced cleanly by the
driver unit then when the amplifier is added, the non-linearity clipping of the
amp causes an undefined amount of compression, thus the signal sound louder at
the received end. This is more pronounced when an amp is over-driven, and can
be seen on an o'scope display. Jon may have a valid point ALC action, but am
more inclined to point at the non-linearity produced by the amplifier
itself.Regards,Ross - W5HFF
On Tuesday, April 14, 2015 12:31 AM, Jon Noxon via BVARC <[email protected]>
wrote:
This kept me up thinking about it. I said ALC when I meant to say AGC.
Jon - KF5TFJ
> On Apr 13, 2015, at 4:26 PM, Jon Noxon <[email protected]> wrote:
>
> How ‘bout this:
>
> Stronger signals do affect (or is it effect?) the ALC and “push” the noise
> level down. Sometimes all it takes is that extra S-unit. The acoustic result
> is a signal that seems much louder, since the brain deals with less noise.
> Try fiddling with the RF gain control for a similar noise reduction.
>
> You did not say if you were dealing with CW or Phone, although Willie C. is
> holding a sign.
>
> Jon - KF5T<F>J
>
>
>> On Apr 13, 2015, at 2:48 PM, Rick Hiller via BVARC <[email protected]> wrote:
>>
>> I am working on a presentation about losses within the antenna system and
>> have come across a question that I have always wanted to ask.
>>
>> -- Why does going from 100 watts (barefoot) to 400 watts (adding a linear)
>> “seem” to make such a big difference in on air performance/audio punch etc.?
>>
>> My observations -- Even though it is only x 4 -- 6dB – one S-unit -- it
>> “sounds” like, most times, a larger jump.
>> Sometimes the receiver indicates a larger jump too, S-meter wise,
>>which points to a receive chain performance issue – non linear AGC gain
>>response. I am guessing here.
>>
>> Anyone care to voice some insight?
>>
>> Thanks and 73…..Rick – W5RH
>>
>> <image002.jpg>
>>
>>
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