Hi folks, after moving to FINLAND where its very cold now, I put up a
longwire loop of approx 84 metres of wire. Its fed with 300-ohms
radioshack line.

The tuner WON'T tune this on the lower bands (but its fantastic on
20m.)

I'm going to try shortening the loop slightly to around 81m, but
before that has anyone got any advice? Why is the SWR so high for the
tuner?

Antenna is about 5m up, and the feedline is about 4.5m.

Ground here is solid granite rock... hence the loop!

Cheers
Clve4

The short answer is "High Current."

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Look at the AH-4 Graphical Wire Length Calculator in the files section of this group.? Yes, the AH-4 is an Icom product, but it is the wire length that is important, not the brand of tuner.

The file is in Xcel 2003.? As is, it's set for dipole/long wire, but the constant is given for loops too.

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Plug in the constant for loops and AVOID the lengths shown on the chart.? Try to find a length that has no data points on the graph.? Remember to start long and trim slowly.

?

?

73

Gary

KC9DJQ?