[K3CAL] FB transmitters on the County Towers.

[Jim Tetlow]

All 

 

The Trunking system WPFN68 is State Wide; western and eastern shore of
Maryland. Sunderland has two transmitters 821/823 and 866/868. This system
is on all towers in Calvert, Sunderland, Dunkirk, Prince Frederick, Island
Creek, Lusby. The interesting frequency is 866.xxxx to 868.xxxx that has a
negative 3rd harmonic 108 mhz.+/-  when you add the other transmitter of 33
mhz. +/- that puts us close to 141 Mhz. So instead of ESPN - (which may also
be a factor @106 Mhz.) it may the two FB transmitters. And if you are
getting interference on 10 meters like I do, you  may want to filter out the
33 Mhz. transmitter at your own station to see if that clears up 10 meters.
Of course there will always be some losses in receiver sensitivity when you
null filter frequencies, but those close to the tower may find something is
better than nothing; you can always bypass the filter until you need it.

Regards,

Jim Tetlow

 

K3UGA

jimtetlow at chesapeake.net

 

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