Here is a transformer table: FT14043 Binocular Source Amidon Amidon Cost $3.75 80 cents size 1.40" od .525" x .550" # turns 4/12 2/6 material vhf hf A-L 952 8500 (thus few turns) pri jX? yes no Vs loss due to jX? 2 to 1 none 73 Bob W7LR