3:1 turns ratio; 9:1 impedance ratio; assumes 450 ohm impedance wire to 50 ohm coax.? The original plans called for only four turns around the core, but I found this weak so I used 11 turns. I used a yellow toroid I found in a burned out PC power supply. Note that I only use this for HF receive, transmitting would be a whole different matter and definitely NOT with this set up!
Jon
toggle quoted message
Show quoted text
On 6/21/21 3:23 AM, Nick wrote:
On 19/06/2021 12:40, JonI via groups.io wrote:
As you know, made the 9:1 unun yesterday for the random wire and it is performing fabulously well!
Jon
do you mean a turns ratio of 9:1 or an impedance ratio of 9:1 i.e. a turns ratio of 3:1?
73
Nick
