[TowerTalk] (no subject)

[Michael D. Ihry]

   Fellow TT's,
        My delima is this:I have raised my 50 ft tower to 85 ft so
        I can stack 2 KT34XA's.I originally had 1 KT at 50 ft rotatable.

        I fed it with 75 ohm catv.It worked great,good swr curves where
        they should be.I now have this beam mounted to the side of the
        now 85 ft tower at 50 ft.I have run a new piece of catv to feed
the
        stacked beams when I get the 2nd one mounted at the top.I am
        going to use a stackmatch fed with equal lengths of 8214 coax.
        By the way,I have cut the new catv to 1/2 wave electrical length

        so as to get a good match.I decided to hook up the beam that
        is sidemounted on the tower to make sure it didnt get out of
        tune by being bolted to the tower.I have 2 27 ft pieces of 8214
        that I intended to use from each beam to the stackmatch.I used
        one of these to hook up this beam directly to the catv.Lo and
        behold,my swr was totally out of wack.I was thinking that maybe
        this coax was bad because I have had it a while.I took the other

        piece and tried that but got the same results.So, I took a full
50 ft
        piece of 8214 and hooked it up and found that all became normal
        once again.Can I assume that this length has now made things
        where they are supposed to be because of lengths? Should I not
        worry about the fact that I now have excessive lenghts of coax
that
        I would assume having more loss in the system?My new piece
        of catv is probably about 50-75 ft longer than it needs to be to
feed
        the tower,but it had nulls right where I wanted them.Am I
defeating
        the purpose of the hardline by using the longer than necessary
lengths?
        If I leave things as they are,I will have a total length of 293
feet of
        feedline to the beams.I would appreciate your comments,and I
        am hoping that I havent just created a massive dummy load.It
seems
        to be working well though.


                                        Thanks,
                                        Bob-WT9Q


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