Topband: Forbidden Frequency Part 2

[Tom Rauch]

> 1820khz and 1810khz.  But, what I was trying to address in
my post was "why
> is 1830khz IN PARTICULAR so bad for so many different
locations?"

.....because quite a few DX stations work 1830 CW. It's
often the center of DX activity, and for some odd reason
once in a while DX stations (some pretty rare) like to
operate right on 1830.

No one worries about 1800, very few DX'ers worry about 1810,
only slightly more worry about 1820.

Then comes SSB at 1840. On SSB at 1840 you can zero beat the
carrier or better yet follow the bandplan and stay on 1843
or above. Besides, on SSB everyone's noise power is about
10dB higher than on narrow CW so any carrier there is much
less disruptive than on a frequency where everyone cranks in
the selectivity.

If the spurious stuff on 1830 for a night moved to 1810 or
1860, no one on the DX clusters would notice or report the
QRM, even if it was several dB louder.

73 Tom