[Elecraft] Keying Bandwidth Mod

[al_lorona@agilent.com]

Earl, this did occur to me as soon as I sent my message. I believe you
are right, that transmitted noise was contributing to what I was
hearing.=20

I am finally getting my shack back in order after the move and am close
to a point where I can test the susceptibility to magnetic fields from
big transformers because I do have an amp that I can test with. I guess
I can let you know what I find and see if it contributes any to the
collective knowledge.

Al W6LX



> -----Original Message-----
> From: Earl W Cunningham [mailto:k6se@juno.com]=20
> Sent: Friday, February 27, 2004 12:29 PM
> To: LORONA,AL (A-USA,ex1); elecraft@mailman.qth.net
> Subject: Re: [Elecraft] Keying Bandwidth Mod
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> Al, W6LX wrote:
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> "When performing this measurement, you need to distinguish=20
> between actual
> clicks and phase noise in the receiver."
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> What may sound like phase noise could be the on the transmitted signal
> due to proximity of the K2 to a power transformer.  This=20
> "noise" is much
> worse if the K2/100 is driving a linear amp because of the greater
> magnetic field from the amp's transformer.
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> My amp, an Alpha 76CA, has a hypersil transformer which=20
> produces an even
> larger field and I cannot get rid of the transmitted "noise"=20
> with the K2
> even six feet from the amp.  Moving the K2/100 to another=20
> room about 30
> feet from the amp "cured" the problem, but that answer is=20
> unacceptable.
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> Eric was going to look into this and try it with his Alpha 99=20
> (which also
> uses a hypersil transformer).  I'm still waiting to hear from him on
> this.
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> Meanwhile, I confine my K2/100 operation to barefoot, so as=20
> not to arouse
> the wrath of my neighboring hams.
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> 73, de Earl, K6SE
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