Thanks to all that replied to my qeustion,
I'm very happy already for joining the group, its seem to have big
benifits and lots of experience people in our hobby with the know how,
which is great! I really enjoying the education part too.
This will be a low level UHF repeater for now about 40 to 50ft off the
ground at the home QTH. The antenna is a tri bander, 6/2/70cm @ 8.6dBi
on UHF and would like to use the 6m and 2m on the controller link ports,
will also require an antenna feed . There is also insertion of a small
duplexer to use 6m and 2m part of the antenna. How would that factor
into line loss? Or should I just leave out the tribander for repeater
use and look for a high quality UHF antenna only?
The Line loss answer was what I was looking for and got it. If I'm going
to make this repeater stuff work, I must get ready to buy aleast the
best antenna and feed line. Thanks much all and 73
Will / W4WWM
Eric Lemmon wrote:
>Will,
>
>The key to building an efficient and reliable repeater is to put the
>majority of the money and effort into the components that are the most
>difficult to install and the most costly to repair or replace. That
>means that your antenna and feedline should be the best that you can
>buy, and should be installed expertly with the appropriate hardware.
>You can always replace or upgrade the equipment down in the radio room,
>but safe access to the antenna and feedline may require shutting down
>other transmitters or may (and probably will) be on the coldest or
>windiest day of the year. So, don't scrimp on the tower stuff!
>
>Belden 9913 is a good low-loss cable, but it is inappropriate for
>antenna feedline. One "rule of thumb" is to select a feedline that has
>no more than 1.0 dB of loss at the higher of the two frequencies in the
>repeater pair. Based upon that rule, you should use at least 1/2" foam
>(such as Andrew Heliax LDF4-50) for a 2m repeater and at least 7/8" foam
>(such as Andrew Heliax LDF5-50) for a 70cm repeater. This is based upon
>your statement that your feedline will be 100' long.
>
>73, Eric Lemmon WB6FLY
>
>n2odw wrote:
>
>
>>Hello to the group,
>>
>> I'm new to this group and also new at trying to build a repeater
>>system. My main question is about line lost. Could anybody tell me how
>>to figue out line loss out for the purpose my repeater application and
>>for the use of the antenna cable I have? The cable is Bendel 9913 @
>>50ohm, planning to use 100ft. Thanks
>>
>>W4WWM / Will
>>
>>
>>Yahoo! Groups Links
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