According to the KX3 documentation, the KXAT3 will handle a 10:1 VSWR
and "match" it.
If I did the math right (always a question) your load must be between
about 5 ohms and 500 ohms, so if your antenna is about 400 ohms (not
resistance, but impedance) then you're okay.
If you have a 600 ohm antenna, the tuner won't be able to give the
finals in the transmitter a perfect 50 ohms.
Use a 4:1 Balun, and your 600 ohm load would be transformed (a balun is
a transformer) 150 ohms and the tuner would handle it just fine.
Use a 9:1 Balun and your 600 ohm load would be transformed to about 66 ohms.
That doesn't say the antenna would radiate it, but the transmitter could
make power and the tuner/transmission line would deliver it to the radiator.
73 -- Lynn
On 1/30/2017 10:59 PM, gliderboy1955 via Elecraft wrote:
What are the advantages/disadvantages of using a 9:1 balun v. using the
switchable Elecraft balun at 1:1 or 4:1 or no balun at all when using a random
wire portable?
Why 9:1?
Thanks
73 Eric WD6DBM
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