Knut,
You might try adding or subtracting feedline at the shack end of the
feedline to bring the SWR down on those bands. I would suggest
experimenting with an antenna analyzer rather than the tuner - you will
be able to see which way to go for making improvement.
The fact is that the feedline with SWR will act as an impedance
transformer, and it will be more of a transformer on bands with high SWR
than on the bands that are better matched.
Some experimentation may be in order.
73,
Don W3FPR
On 12/7/2012 5:52 PM, ab2tc wrote:
Hi,
Still can't manage to get any improvement doing this. Anyway, right now the
tuner is doing a great job to my G5RV on all bands except 15m and 80m. For
those bands the raw SWR is above 12:1 so is outside the design parameters
for the tuner. These are screen shots for the bands where the tuner is
finding a good match:
http://ab2tc.getmyip.com/g5rv_10m.png
http://ab2tc.getmyip.com/g5rv_12m.png
http://ab2tc.getmyip.com/g5rv_17m.png
http://ab2tc.getmyip.com/g5rv_20m.png
http://ab2tc.getmyip.com/g5rv_40m.png
I'll continue to work on the 15m and 80m to see if I can improve it.
AB2TC - Knut
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