What are you calling great results? At best my UHF at 100' on a handheld with a 6 dB gain antenna gives me about 7 to 8 miles of range, considered usable, fed with 1/2" hardline. At 170 ft of LMR 400 you would have nearly a 3.5 dB of loss in just the cable.
Mathew
Jay Urish <[EMAIL PROTECTED]> wrote:
Just as a point of reference, I have a UHF machine Moto MSF5000 pumping
out 90watts going up 170 ft of LMR400 coax and I get great results. To
make it more interesting, I have a comet duplexer at the feedpoint (in
my station) so I can use the VHF part of the fiberglass dual band
wonderstick as RX for my vhf repeater till I get a duplexer that will
tune to 144.630(my DB duplexer wont)
[EMAIL PROTECTED] wrote:
> At 1/6/2006 01:34, you wrote:
>
>>Bob,
>>
>>Sorry if I didn't get it right but now I am really confused .... and open to
>>learn.
>>
>>
>>
>>>Shielding percentage of the antenna feedline has nothing to do with duplex
>>>suitability.
>>
>>Somewhere I am missing something.... If shielding doesn't play a part in the
>>suitability factor of selecting feedlines, why do we use hardline (other
>>than less loss) or double shielded jumpers for connections etc.in a duplex
>>operation?
>
>
> Double-shielded jumpers are needed where isolation is needed between TX &
> RX (duplexer jumpers & RX/TX connections to the duplexer). From the
> duplexer antenna connector onward to the antenna, the TX & RX are already
> combined. What's important there is linearity. RG-214 is double-shielded,
> but it's also silver plated (or supposed to be, some '214-type' cable
> isn't). Hardline has a solid outer conductor with no intermittent/point
> contacts to generate IMD, so it's also extremely linear.
>
> Bob NO6B
>
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> Yahoo! Groups Links
>
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--
Jay Urish Systems Engineer
Unixwolf Enterprises LLC.
http://www.unixwolf.net
972.691.0125 972.965.6229
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