At 1/20/2006 21:27, you wrote:
>All this discussion about duplexer tuning and cabling is making me
>wonder if I should not order a duplexer for the TKR-750 and just use
>separate TX and RX antennas. Most repeaters, of course, operate on a
>specific frequency pair but, since mine will be mobile and could be
>set up anywhere, I'll be selecting whichever frequency pair
>throughout the 2-meter band that's reserved for repeater use and
>won't cause any interference with a coordinated repeater wherever I
>stop. I'll have to be careful about being co-channel with anyone
>within 120 miles and avoid adjacent frequencies unless I can get the
>proper separation with the adjacent repeater.
>
>By using non-ground plane antennas with magnetic mounts atop the
>spacious roof of the Sprinter van, there's some flexibility on the
>spacing between the TX and RX antennas. Is there some rule of thumb
>for spacing these two antennas (that will be at the same height above
>ground)?
I suggest that ask your freq. coordinator to set aside a wide-split pair
specifically for portable repeater use. Here in SoCal we have such a pair:
147.585 in, 144.930 out. This split allows for the use of small mobile
duplexers normally designed for 5 MHz spacing, which would be much easier
to tote around than a full-size 600 kHz spaced 2 meter duplexer.
Bob NO6B
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