Would a pulsed two-tone modulation reveal something ???
OZ5TG, Verner
----- Original Message -----
From: rb <rbigg@pcola.gulf.net>
To: <amps@contesting.com>
Sent: 6. marts 2000 18:11
Subject: [AMPS] SSB interference
>
> Peter (SM2CEW) and others have raised some interesting points about
"dirty"
> SSB signals heard during a contest this weekend. The topical points this
> raises are interesting.
>
> I'm certainly personally an adovcate of having a good, clean signal. The
> problem is, I don't know how to do that without resorting to asking for
> on-the-air signal reports, which, fortunately, I get every day I'm on the
> air through guys on the net I check in with. Let me explain why I
otherwise
> don't fully know what kind of signal I'm putting out.
>
> I'm sitting here with a nice matched exciter, final, and monitor scope.
> WOW! What more could a guy want, you say??? Well, believe it or not, I
> still don't know of a way to tell the composite quality of my transmitted
> signal.
>
> Yes, the exciter and final are hooked through the monitor scope. So what
> does this do for me? Well, in one switch position, I can look at Sine
Waves
> dancing around over the screen of the scope. These fluctuate in width and
> amplitude with speech, and vary so fast that I really can't tell if I'm
flat
> topping or not. The other test I can run is to use the oscillator in the
> scope to inject a two tone audio signal into my rig and then look at a
> trapezoid screen pattern. This test does indeed tell me if/when my final
> isn't behaving in a linear manner. But, it is only useful with the tone
> injection, and doesn't tell me anything about transmitted signal width
> and/or buckshot/splatter when speech is present. It tells me what the
final
> is doing in a steady state condition.
>
> So, given the above, is there any simple, practical way of getting a good
> idea of what kind of signal my rig is putting out? I have a feeling there
> may be a fair number of hams out there who would like to know the answer
to
> this question. Please keep any answers as non-tech as possible. I'm sure
> that by now the 8,000,000 or so hams reading the mail on this reflector
have
> figured out that I'm not a rocket scientist or brain surgeon by profession
> or training.
>
> I don't want to ever put out a bad signal. I'm thankful that I have a
> means, through other hams on the net I check into, to give me a reading of
> relative signal quality. Is there a better way?
>
> 73 de Ron, K5BDJ
>
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>
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