Barry,
With my SDR-IQ looking at the K3S i-f output I can see the other guy's
signature. I suppose a P3 does the same. It's pretty amazing to see some of
the lousy signals when we have such improved technology.
Wes
On 8/28/2019 1:30 PM, Barry 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" <[email protected]>
To: [email protected]
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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