[Elecraft] Exact 5MHZ Channel Frequencies

[Bob Nielsen]

George,

Shouldn't the offset ideally equal the center of the transmitted SSB
passband, which is a function of the filter and BFO frequency?  This
will vary slightly between different radios.  With a passband of 0.5
to 2.5 kHz, an offset of 1.5 kHz would center the signal, but if the
passband were 0.5 - 3.0 kHz, the center would be offset from the
supressed carrier by 1.75 kHz).  

I said "ideally," because the stations should be netted on the same
frequency, thus it makes sense to pick a common offset to use.  I think
either 1.4 or 1.5 would certainly work.

73,
Bob, N7XY
K2 #3273

---
Bob Nielsen, N7XY                          n7xy (at) n7xy.net
Bainbridge Island, WA                      http://www.n7xy.net
 

On Fri, May 16, 2003 at 10:45:27AM -0500, George,  W5YR wrote:
> Roy, an English ham posted that they do the same thing only they
> offset 1500 Hz instead of "our" 1400 Hz. Evidently their "channels"
> are 3 KHz in width.
> 
> 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: <Unifiedtx@aol.com>
> To: <elecraft@mailman.qth.net>
> Sent: Friday, May 16, 2003 7:03 AM
> Subject: [Elecraft] Exact 5MHZ Channel Frequencies
> 
> 
> > If the FCC intends allow us to use 5332, 5348, 5368, 5373 and 5405 Khz,
> then
> > they should have told us we can use 5330.6, 5346.6, 5366.6, 5371.6 and
> 5403.6
> > USB.  This would make the 1.4 Khz shift allowance to center the sideband
> in
> > the channel.  It seems to me the FCC needs to go back to the drawing board
> > and restate the above frequencies for the amateur service since we use the
> > suppressed carrier frequency on all other bands.  It seems to me that the
> FCC
> > is causing unnecessary confusion in the amateur service which may result
> in
> > many hams using the wrong frequencies.
> > If we have to use 5403.6, would this put us off 1.4 Khz from the UK hams
> who
> > will be using 5405?  Roy W4WFB
> >
> >