Don't forget that most radios don't start the bottom end of the passband at
0. It is usually 200 hertz . So if you are using a 2800 hertz filter and
the bottom of the passband is 200 hertz, then your desired frequency is 200
+ 2800/2 or 1600 above the dial frequency. It seems like everyone would be
on a slightly different frequency depending on how their radio passband is
designed and transmit filter they are using in order to center their SSB
emission at in the prescribed channel.
Carl Moreschi N4PY
Franklinton, North Carolina
n4py@earthlink.net
----- Original Message -----
From: "George, W5YR" <w5yr@att.net>
To: <tentec@contesting.com>
Sent: Friday, May 16, 2003 6:33 AM
Subject: Re: [TenTec] 60M
> The government and the military, in short.
>
> They specify frequency in terms of the center frequency of the occupied
> bandwidth or channel width. Hams use the transmitted frequency for all
> carrier-present modes and the suppressed carrier frequency for SSB, SSTV,
> etc.
>
> So, if a channel is 2.8 KHz wide and the FCC defines the center frequency
> for the channel - and the R&O clearly says "center frequency" - then the
way
> our rigs are set up, we have to set the dial to that specified center
> frequency and then lower the reading by 1400 Hz to put our
> suppressed-carrier frequency on the lower-frequency edge of the channel
such
> that our occupied bandwidth will run from that edge upward 2.8 KHz.
>
> It *is* different! <:}
>
> 73/72, George
> Amateur Radio W5YR - the Yellow Rose of Texas
> Fairview, TX 30 mi NE of Dallas in Collin county EM13QE
> "In the 57th year and it just keeps getting better!"
> <mailto:w5yr@att.net>
>
>
>
>
>
> ----- Original Message -----
> From: "Kip Glunt" <kipg@yorkinternet.net>
> To: <tentec@contesting.com>
> Sent: Friday, May 16, 2003 1:15 AM
> Subject: Re: [TenTec] 60M
>
>
> > I'm curious, when did the center of a Single Sideband signal (presuming
it
> could have an upper or lower sideband) become the specified frequency plus
> or minus 1400 KHz.? Where did this come from?
> >
> >
> > ... Kip, WB3AFL
> >
> >
> >
> > _______________________________________________
> > TenTec mailing list
> > TenTec@contesting.com
> > http://lists.contesting.com/mailman/listinfo/tentec
>
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