You may be getting interference from nearby broadcast stations. The MFJ
runs just microwatts, so it wouldn't take much to upset the readings,
especially at that height. I live withing 4 miles of a 50 kw AM station and
can see the effects with a tribander at 40 feet.
Kenneth Mathews wrote:
>I have a forty meter two element cushcraft beam on 160 foot Rohn 45
>tower, newly mounted. It checked using an MFJ 259 at 1.1 to 1 at
>7.100 mhz on the ground at ten feet on a test tower. Now after raising
>to 160 feet it checks 2.5 to 1 at 7.200 mhz, with no real match
>anywhere near forty meters. Now it has been taken down and checked
>from elbow to you know where and it is still at the correct settings for
>the book and checked good on the same MFJ meter. Then it went
>backup to 160 feet and you guessed it it now is at 2.5 to 1 and doesn't
>show a big dip on the meter.
>Question the antenna is notgrounded well to the tower yet it is
>suspended by the bearing plate and clamps above the bearing, could it
>not being grounded to the tower be causing the interaction or what?
>Any Ideas please post here, as we have several friends trying to sort
>this out. Ideas or suggestions are appreaciated.
>Thanks and 73
>Ken ( gettin tried of climbing)
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