Anonymous wrote:

What's all this about channels 30 through 40being ssb only?

I have listened for months and years here, in the U.S.,
and except for channel 38,every channel I hear, including
the upper channeels and channels 39 and 40
are all AM-only,

If you broadcast in SSB on channels 30 through 40 here, you
wil get chewed out by someone or many someones..

Unless you're using channel 38

It seems to me that the "gentlemen's aagreement" is
to use only AM on every cb channel except for channel 38.
well,
actually, per part 95, no frequency within the 11 meter class D band can be
exclusively for any specific mode. the SSB only thing is an
informal 'gentlemens agreement' setup years ago among the more advanced cb
operators to cut down on noise (hetrodynes, etc) on the upper chans.

for the most part, that agreement had held to this day. chan 19 is used for
the local trucking/comms (as well as some others) and a few of the truck
stops run radios and call drivers to their channels to present information
(traffic conditions, advertised specials on products/services, etc).

its not exactly well managed, but information does flow (if you can cut
through all the noise, especially on heavy skip days).