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G8MNY > TECH 31.03.08 19:00l 100 Lines 4209 Bytes #999 (0) @ WW
BID : 51748_GB7CIP
Read: GUEST
Subj: 70cm 22el Yagi
Path: IZ3LSV<IW2OHX<IR2UBX<IW0GPS<ED1ZAC<GB7CIP
Sent: 080330/2327Z @:GB7CIP.#32.GBR.EU #:51748 [Caterham] $:51748_GB7CIP
From: G8MNY@GB7CIP.#32.GBR.EU
To : TECH@WW
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 Centre 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 Construction lengths.
Double up boom where mast clamp
mounts. use 12" of 7/8" OD x 0.049 wall - 6061
|
No. 8-32 screw | Slot & 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 using plastic insulators between
the el. & 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" Balun 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
| & solder to N-connector.
|
use UG-58a/u
connector
mounted on
small bracket.
Balun made from UT-141 copper-shielded coax, RG-303 or RG-142/u Teflon-
insulated cable could be used.
--==|======================================================|==--
^ |< 233 mm shield >| ^
| centre
5 mm core
Dielectric
Driven element side looking >
solder centre of the UG-58a/u & right side if the Balun then to right driven
element. left side of the Balun solder to left driven element.
19 mm - Centre line of driven element to
Centre line of - 15 mm v rear face of n-connector bracket.
n-connector v | |_
above boom. -- /-|_ <UG-58a/u
/--|------------------<Balun
=======O====\============================
\
Solder log attached to the
bottom screw on connector, bend 90 d
& solder to UT-141 shield.
Thanks to the ARRL Antenna book.
Offered by Jack - KE4IQQ - AAAC #1
Address: KE4IQQ @ KF4BPX.#OKE.FL.USA.NOAM
Why Don't U send an interesting bul?
73 De John, G8MNY @ GB7CIP
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