[Elecraft] KAT3 - Antenna tuned or not?

[G4ILO]

Tom Hammond-2 wrote:
> 
> Yes... and the SWR (AT THE POINT AT WHICH YOU'RE MEASURING IT) is going to
> REMAIN 5:1 for a long time... hopefully... if it changes, then there's a
> problem with your antenna.
> 
And what's more, if the feeder is very long, it could result in significant
signal losses. Take a look at the chart at
http://www.g4ilo.com/mismatch_losses.html which shows the amount of loss at
different frequencies for RG-58, RG-213 and open wire feeder. This is in
addition to the loss normally expected because of the feeder length.

The Elecraft tuners have a great ability to match a wide range of loads
(compared with the auto ATUs in other transceivers) but they can't do
anything about this problem. If you have a non-resonant antenna and want to
feed it with co-ax then the best place for the ATU is at the antenna feed
point not the back of the radio. Built-in ATUs are really meant for matching
resonant antennas that present a slightly too high SWR when used near the
band edges.

-----
Julian, G4ILO  K3 s/n: 222 K2 s/n: 392
G4ILO's Shack: www.g4ilo.com
Zerobeat Ham Forums: www.zerobeat.net/smf
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