[Elecraft] K3--Too much ALC creates energy on opposite sideband?

[Michael Walker]

I agree with  Jim and what I tell hams every day since I seem to talk to a
bunch of them on the phone.

Do NOT use the settings other tell you, set up the radio by using the
Meters in the radio, in this case the ALC. That is the reason it is on the
radio.

The more ALC you have, the  more the radio is already shutting down down
your audio gain and hence the reason it is called Automatic Limiting
Control.

I am not a big fan of compression and in today's world there really is no
requirement to have it on.  Ask anyone who has been DXPedition end of a
DXPedition and they will tell you to turn it off as it is actually harder
to understand you.

It 'might' look like you have more power out, but it is not really in a
good way.

This is also a good time to review page 28 on "Voice Modes" and follow the
steps the way the Engineers who designed this want you to set up your
radio.  They are pretty smart people.  :)

I hope that helps, Mike va3mw


On Wed, Aug 28, 2019 at 4:33 PM Barry <barrylazar2 at gmail.com> wrote:

> Wes,
>      You make a very good point. The unwanted sideband will not be 0;
> there will be some "residue" that can be heard if the signal is strong
> enough. And, a lot has to do with the measurement method at the
> receiver.
>
>      Years ago, I was running DSBSC using a Globe DSB-100. I was told
> that my carrier was way down but my unwanted sideband was only 20 db
> down. That was interesting as I made no effort to suppress my unwanted
> sideband. The problem was the method that was used to make the
> measurements and the strength of my signal. So, determining the ratio of
> the two sidebands might be difficult, but it may be the correct
> approach, However, it will require being able to "see" both sidebands on
> an equal basis.
>
> 73,
> Barry
> K3NDM
>
> ------ Original Message ------
> From: "Wes" <wes_n7ws at triconet.org>
> To: elecraft at mailman.qth.net
> Sent: 8/28/2019 1:45:11 PM
> Subject: Re: [Elecraft] K3--Too much ALC creates energy on opposite
> sideband?
>
> >Although the manual doesn't say so, according to an ARRL review, the K3S
> is specified to have undesired sideband suppression of >50 dB.  ARRL claims
> an optimistic >70 dB.
> >
> >So if you are extremely strong at the other guy's place, he might easily
> hear an opposite sideband, even though your radio is operating correctly.
> Ask him what the ratio is.
> >
> >Wes  N7WS
> >
> >On 8/28/2019 9:40 AM, Nate Bargmann wrote:
> >>I received a note this morning advising that I should check my ALC as he
> >>is seeing some energy on USB when I check into a 75m voice net on LSB.
> >>I am using an MC-50 microphone and am running the mic gain at 35 and the
> >>compression at 11.  My thinking was that generating opposite sideband
> >>energy would be quite difficult with the K3's DSP.  Am I wrong?
> >>
> >>I'll try working with him some morning and back down the mic gain a bit
> >>and see what that does for him.
> >>
> >>73, Nate, N0NB
> >>
> >
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