[Elecraft] 9:1 Balun

[Lynn W. Taylor, WB6UUT]

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