Ron, you are 100% on the money.. I was thinking about how I wanted to
explain the same thing.. thanks.. Fred
Fred Moore
email: f...@fmeco.com
wd8...@gmail.com
phone: 321-217-8699
On 9/3/17 7:04 PM, Ron D'Eau Claire wrote:
> The advantage of controlling the gain manually is not an "old wife's tale".
> Rather, it's clearly just a technique that is not for everyone.
>
> AGC will reduce the gain according to the strongest signal inside the I.F.
> passband. Manually riding the "RF" gain ensures that a very weak signal is
> not affected by a strong signal that is also inside the I.F. passband. Of
> course that means your ears could be blasted by that strong signal, which is
> why Wayne included a hard limiter that can be enabled to chop such a signal
> down to size, making it no louder than the weak signal we want to copy.
>
> It has become a moot point for many operators today who cannot read CW if
> they are hearing two or three (or more) signals within the I.F. passband all
> at the same time. For them, it's essential to have enough I.F. selectivity to
> isolate one signal and so AGC is just fine.
>
> But some of us have a lifetime of experience sorting out multiple signals
> with our gray matter between the ears and prefer to continue to do so --
> probably until we all become SKs.
>
> 73, Ron AC7AC
>
>
>
> -----Original Message-----
> From: elecraft-boun...@mailman.qth.net
> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Wes Stewart
> Sent: Sunday, September 3, 2017 3:00 PM
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] Noise Blankers
>
> Just a couple of points.
>
> In the K3(S) there is no "RF Gain" control unless by RF gain you mean "It's
> not the audio gain gain control."
>
> The "RF" gain control operates on the i-f amplifier, which is after the
> analog noise blanker. In this regard, it is little different from AGC, which
> operates on exactly the same circuitry. Why some people believe that they are
> better at controlling i-f gain than the AGC system does is beyond me, but old
> wife's tales die hard. If this is hard to fathom, watch the S meter as you
> reduce "RF"
> gain. The reading increases, no different from letting the AGC do it.
>
> Attenuation is a different matter. It operates at RF and is a viable tool.
>
> About noise blanking, I think I had a little to say about that almost 40 years
> ago: http://k6mhe.com/n7ws/Noise_Blanker.pdf
>
> Wes N7WS
>
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