Howto build a circular polarized cross element yagi from two identical yagis. This methode will work with any pair of well-behaved yagi's. I have used TRIAX antennas bought through EDR (Experimenting Danish Radioamateurs). The forward shift is 514 mm for the 2 meter antenna and 172 mm for the 70 cm. Of course you have to increase the Designsvary, but there are basically three different types of mobile antennas: the ¼-wave vertical, the ½-wave vertical, and the ⅝-wave vertical. In general, the taller the antenna, the more gain the antenna will have. So, if the bulk of your operation will be in town, close to the repeaters, a ¼-wave vertical should work well for you.
MagicBand Antennas for Ham Radio, 6 Meter Antennas You Can Build by Bruce Walker, N3JO. Published by ARRL. Six & Four, The Complete Guide to 50 and 70 MHz Amateur Radio by Don Field, G3XTT. Published by Radio Society of Great Britain. Six Meters, A Guide to the Magic Band by Ken Neubeck, WB2AMU. Published by Worldradio Books.
Aimyour yagi antenna directly at the satellite, with the shortest rods (directors) closest to the satellite and the longest rod (the reflector) farthest away. When the pass starts, aim the yagi toward the satellite, then sweep it right and left slightly until you hear something.
DESIGNDATA FOR YOUR YAGI. Note : It is quite possible, that other calculators deliver slightly different results. Some are based on look-up tables, some completely hide their algorithms. We use an interpolation approach. Our results are optimised for gain, but others may be optimised for bandwidth. However, if the parasitics differ much from 0 Fig 1 Ultra-simple "wire" version above made on an SO-239 connector. Designed for hanging from any handy support and can be hung from trees, used inside motel rooms or as a "stealth" antenna. Fig 2. Table top "wire" version above using a dowel or other simple base. Upper and lower elements must be self supporting. Use aluminum or copper tubing.1nhY. 276461931715690414271313
