[Towertalk] TH11 SWR problem

[DK2GZ@aol.com]

Hello


a friend of mine, DJ4PI have a problem since a few days with his TH11.

The Problem:

Sometimes the swr jumpes up from 1:1.2 to 1:3.

He did exchange the entire coax from the shack up to the antenna in one piece.
No difference!

Then he disconnect the balun.
No difference.

He checked the entire antenna for poor connection, but canīt find any
poor connection.

The problem getting stronger on the higher bands, 20 meter is quiet fair,
but on 17,15,12 und 10 the swr jumps up and down, also with low power
100 watt. The effect is increasing with the frequency.

He checked the antenna also with his swr analyzer(MFJ) without any power
and got the same swr-jumping.

Any help here on the reflector?

Please answer to me or to Emil, DJ4PI@t-online.de

Thanks de Harry, DK2GZ