I'm interested in building a medium gain antenna with a wide beamwidth. I see that hkaye has experienced success using a double biquad with 15 cm sides for interior diamond and 10cm sides for outer diamonds. Is that the recommended dimensions? Someone else found through optimization that the smaller diamond whould be on the inside and bigger diamonds further away from the feedpoint. Which is right? Is there a recommended feed spacing? I'd like to use either 1-1/4 or 1-3/4 inch feed spacing. 300ohm showed excellent gain on a double biquad using 2x4 inch mesh. I'd probably use 300 ohm's reflector size but I didn't see the spacing from the antenna to the reflector? For me, 4-1/2 inches works well with my method of constructing antennas from pvc components, hopefully that is close optimum for the double biquad.
Also, I don't know how to run the nec models. What is the beamwidth for the double biquad at say 470, 600 and 680?
Thanks!
Also, I don't know how to run the nec models. What is the beamwidth for the double biquad at say 470, 600 and 680?
Thanks!