charlie wrote in news:PpmdnSwlVffV47
:

....
As an example I have a ten metre dipole in my loft, some 25 feet
above ground. It resonates at 28.44 at the end of approx 10 metres
of 50 ohm coax, the SWR is 1.4:1 . The bandwidth at 2:1 is 28.25
-28.63. At 2.5:1 it is 28.160-28.760. This is before the ATU, after
the ATU the TX sees from 1:1 to 1.4:1 over the whole of ten metres.

You didn't mention the balun, it is significant.

Owen

Owen Duffy wrote:

SNIP


You didn't mention the balun, it is significant.

Owen

I can't comment on that as I did not make any measurements without a
balun. It was always going to have a balun because I did not want
any significant RF coming down the outside of the coax and causing
interference.

It would be a simple matter for Jim to make a balun like mine and I
imagine he'd get very similar results.



Charlie.

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