[BC] MCI MW Interference

[Stanley Adams]

I have contacted Tom directly and will be able to help him once we get some
other bits of information.

FYI, The old C Band is in the 4 GHz 'much older' Land based Common Carrier
band.  This band was highly used by all Common Carriers and is still in 
use in parts of the country. Channels are 20 MHz wide and are stacked by the
CC'ers in such a way as to get a satellite channel and the adjacent channels
too.

The rules are clear that unless your facility is 'grandfathered' with the
receive only licenses then the common carriers are not responsible for 
any interference that you might suffer.  Having said that, it has been the
general tenor over the years to help out where possible and to provide
some direction and information that might help. We had to redo the Mt.
Sterling Ky CATV head-end by moving them because they were licensed.

I have done many of these RFI studies, especially during the 1980's and up
into the early 90's.  This was in addition to my other duties as a Sr Field
Engineer with MCI.  I worked out of Nashville, Louisville and worked about
every hollow between Cleveland to Cincy to Lexington, Charleston, Louisville
and Nashville to Dallas.  Also worked the MW route from Lexington Ky to
Atlanta.

4 GHz can travel quite a ways past the radio horizon.  Typical power out of
the radio stack is @ +26-28 dBm.  Add a 10-12 ft dish and you have a pretty
narrow beam of strong energy.  Modulation is some form of QPSK, so it is 
broadband digital, all the time.

Stanley Adams
Memphis