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echo: ham_tech
to: ALL
from: ROB DENNIS
date: 1997-12-22 20:09:00
subject: Field Day Part 3B

 Original article from: Wayne Sarosi 
 Reposted by Rob Dennis,Moderator HAM_TECH,for use of the FIDO HAM_TECH echo.
  THIS POST/SERIES NOT TO BE USED IN ANY CDROM COMPILATIONS FOR COMMERCIAL
 SALE WITHOUT EXPRESS WRITTEN PERMISSION OF ORIGINAL AUTHOR(S) OF THIS POST.
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Continued from previous posting:   part 3
Cubical Quads: (Mono band,armstrong rotor,etc)
 This antenna can be a real hoser if not constructed correctly the first 
ime.
 Preps on this antenna are a must. Spreaders must be checked and elements 
lso
checked. There is nothing worse than getting to the field day site and having
difficulty with a Cubical quad. A strong antenna but a real pain in the butt
raising and lowering to adjust,especially in the rain. Like a box kite,this
antenna does lend itself to the wind.
 Whether you use the D/DE or DE/R configuration,it makes no difference.
 This is a homebrew antenna for the most part. There is very little in the
commercial source market for these antennas. So,get your sh** together early
if you want to use a Cubical quad on field day.
 Assemble per your design and test per the yagi directions.
 Cumbersome as it is,this must be done.
 Mark all connection points and if possible,use expanding spreaders and wire
clamps on the ends. -IF- you use a tuning arm,be sure it's protected in the
correct position and can be easily re-adjusted if required.
 A cubical quad can fold down into a very neat package,but that will take
some forethought on your part.
==================================================
Inverted Vees: (fixed,mast support or improvise)
 An Inverted Vee *may* tune fine at home and then be out to lunch at the 
ield
day site. Using the tuning extentions I posted for Inverted Vees will solve
any problems relating to this.
 Why this happens is that at home the IVee is interacting with Guy wires or
other wire antennas or something in the immediate area of the antenna.
 At my home,the roof flashing does not require a tuner when used as an 
ntenna
on 40m,I found this out by accident. Thus,my 40m inverted V was very 
ifficult
to tune. So was a 15m yagi I had once.
 Solution: I grounded the roof flashing.
 Select a clear open area to cut,assemble and test the antenna.
 Once this is accomplished,the IVee should work just fine.
 Hints: Raise and lower the antenna using a rope and pulley. You can attach a
rope & pulley to the mast prior to raising and securing the support. Use rope
as guys rather than cable. A wheel & tire from a car make an excellent mast
base when combined with a clamp & flange assembly.
 This appeared in QST I believe about a couple of years ago.
 Any good mast base will work and I have used plywood and a hinged base
support many times.
 If you can,use a 1:1 BALUN. Hook ups are easier and so is raising.
=================================================
 Wire Dipoles: (fixed,mast or rope support)
 Pretty much like the Inverted Vee,prepare ahead.
 Similar problems may happen so test in an open area.
 At the site,determine where the antenna needs to face and then pick out the
best supports. If using masts,set up similar to a large volley ball net (very
large). The farther apart the supports,the more the rope will sag if no 
enter
support is used. On 10m and 15m this is not too much of a problem.
 By the time you get to 40m and below,the sagging is a big problem.
 I will suggest the wire dipole be supported in the middle and the ends held
out with rope.  Set up similar to the Inverted Vee.
 Use a 1:1 BALUN.
==================================================
-WS
--- GoldED 2.42.G1219
---------------
* Origin: VE3SJN....Moderator....HAM_TECH (1:163/506.4)

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