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Re: [Amps] Maximum RF output in practical application: 4-250A

To: "Keith Dutson" <kdutson@sbcglobal.net>,"'Joe Isabella'" <n3ji@yahoo.com>, "'Tom W8JI'" <w8ji@w8ji.com>,"'Joe Subich, W4TV'" <w4tv@subich.com>, <amps@contesting.com>
Subject: Re: [Amps] Maximum RF output in practical application: 4-250A
From: "Jim Tonne" <tonne@comcast.net>
Date: Mon, 3 Jul 2006 22:05:14 -0400
List-post: <mailto:amps@contesting.com>
Keith wrote:

> It [ wideband transmissions] definitely is not warranted in a contest 
> where the bands are crowded.

And when the bands are crowded the receivers must be
made narrow.  And then, as I pointed out, it is impossible
to have a wideband system because the receiver is a part
of that system.

> There is nothing wrong using high fidelity as long as no interference is 
> caused.

And remember that the receiver is part of the system, part
of a chain.

I think that one of the reasons that SSB got a bad rap from a
fidelity viewpoint is that too many systems were designed using
four-pole filters.  To get any kind of stopband selectivity at all
those had to have a narrow top.  So the low-end response was
down 6 dB at perhaps 400 or 500 Hz on the low end and
2400 or 2500 Hz on the high end.  Pretty difficult to listen to
for very long.

- Jim WB6BLD


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