At 10/8/2009 06:04, you wrote: >Possible options ????? > >I decided to poke around on the Bird TX/RX website and found this >"little" guy ( relatively speaking :-) ) > >Probably more command post sized than SUV sized but hey.. how big is >that SUV :-)??????? > >http://birdtechnologies.thomasnet.com/item/all-categories-duplexers-and-triplexers/duplexers-2/28-37-04c?&seo=110 > >At 9.5 x 19 x 10.5 inches, COULD fit in a car.. It is rated at 65db >at .5mhz.... so would be a bit better at .6mhz and as I recall many >of the little mobile duplexers are typically 65db to 80db at >best....so would be in the neighborhood of lowest useable isolation >figures, depending on how quiet the TX is to start with. > >It looks like it gets to 70db at 1 mhz with less insertion loss so .6 >mhz would likely be somewhere in between... if you do not mind the >insertion loss...
Not enough isolation. With most equipment you need at least 80 dB. Possibly with a very low noise (PLL exciter) TX you could get away with a few dB less but ~67 dB isn't enough. But as you say, using this & split antennas just a few feet apart might yield sufficient isolation. Bob NO6B
