Back to the project...getting a 147.09tx/147.69rx repeater and 144.39 
APRS on the same antenna...I received many good answers and links to 
assist me.

HOWEVER...looks like the costs are such that I could consider another 
route..namely two antennas/transmission lines, one for 144.39 and the 
other for the 147.09+ repeater. The tower is 200' and we have line 
and antennas available, so cost wise this is a sensible way to go. 

My first choice would be to put both antennas one the top, in the 
same horizontal plane.  Actually we have to go to the top to get away 
from a flock of 2.4 GHz 802.11b service antennas.  The physical 
separation between out antennas will be the issue..the tower has a 
40" face, so the simple install would have the two antennas (specs 
claim 6 dbi) 40 inches apart.

Are they any tables someone could point to which would tell me what 
the db separation this would achieve so I could see what might be 
required in cans to make this approach work?

The radios are Motorola Micors which have pretty good filters in the 
front ends.

Ron N5IN





 
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