Distance Length Ref. 30 346 Boom lengths: Front boom 7/8" OD x 0.049" wall DE 134 340 6061-T6 tubing 1530 mm (60 1/4") D-1 176 321 long. D-2 254 311 D-3 362 305 Center boom 1" OD x 0.058" wall D-4 496 301 6061-T6 tubing D-5 652 297 D-6 828 295 Rear boom 7/8" OD x 0.049" wall D-7 1020 293 6061-T6 tubing 1580 mm (62 5/16") D-8 1226 291 D-9 1444 289 D-10 1672 288 D-11 1909 286 D-12 2152 285 D-13 2403 284 D-14 2659 283 D-15 2920 281 D-16 3184 280 D-17 3452 279 D-18 3723 278 D-19 3997 277 D-20 4272 276 ------------------------------------------------------------------------- 22 el. Boom Contstruction lengths. Double up boom where mast clamp mounts. use 12" of 7/8" OD x 0.049 wall - 6061 | No. 8-32 screw | Slot and use (2 places) | clamp (2 places) v (v) v --------------------=#==+===========|=|=====+==#=------------------------ ^ ^ ^ ^ |----- 1412 mm -----|---------- 1415 mm --------|------- 1475 mm -------| (55 9/16") (55 11/16") (58 1/16") |-------------------------------4302 mm --------------------------------| (169 - 5/16") -------------------------------------------------------------------------- Element mounting. The elements are installed through the boom useing plastic insulators between the el. and boom. Stainless steel push-nut retaining rings hold the el. in place. ------------------------------------------------------------------------- Details for the driven element. <------------------------------- 340 mm -----------------------------> <-----62 mm---->v clamp 0.03 alum. 3/8" wide <---- 62 mm -----> ----------------|-----------------( )--------------|------------------ < 38 mm >------|---------------o| .>|o------------|-----\ 15 mm ^ ^ |___| \ ^ Solder T wire 122 1" Balum T wire 140 mm length of lug mm length of ^ #12 wire make straight portion no. 12 wire. | of T wire 122 mm long; form | and solder to N-connecter. | use UG-58a/u connector mounted on small bracket. Blum made from UT-141 copper-shielded coax, RG-303 or RG-142/u taflon- insulated cable could be used. --==|======================================================|==-- ^ |< 233 mm shield >| ^ | center 5 mm core Dielectric Driven element side looking > solder center of the UG-58a/u and right side if the Balum then to right driven element. left side of the Balum solder to left driven element. 19 mm - Centerline of driven element to Centerline of - 15 mm v rear face of n-connector bracket. n-connector v | |_ above boom. -- /-|_