[TowerTalk] R.E. Matching Sections-Modified Yagi

[Nick Pair]

If I remember right, when you remove the triagonal reflector and replace it with a single one, you must increase the reflector to driver distance. If you just placed the new reflector in the holes where the vertical boom the triagonal reflectors were, it will be too close. I don't have the dimensions in front of me right now, but I think the new location is about 2 3/4 inches past the end of the existing boom. Cushcraft abandoned the tri reflector and you could use the dimensions from the antenna they replaced it with as a starting point for reflector length and position. The T match works well and if you adjust the shorting bars on the driver you can dial in quite a range of impedance's from the stock 13 or 14 ohms.
The modification of removing the triagonale reflector was done on quite a few 3219 and 42 18 beams for EME arrays and worked out well. You might check on the vhf reflector and find someone with a better memory than I have on the mod.
Good Luck,
Nick
WB7PEK 


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