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echo: ham_tech
to: ALL
from: ROB DENNIS
date: 1997-11-05 17:17:00
subject: Wires Part 3

 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
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SUBJECT: Wire antennas- part 3
 In this posting I will be discussing some of the different wire antennas
the we use in the amateur world.
 These antennas are:
 o Long Wire, closing remarks.
   The long wire antenna was discussed in the previous posting.
   I would recommend this antenna for those interested in a continued contact
 postion with a specific station. Long enough,the longwire can provide very
 good signal in the direction of the antenna for fixed communication.
 o Wire Dipole
   Simple to make and inexpensive to buy.
   It's the basic design for Inverted Vee. Basically a bidirectional antenna
 with a balun. Antenna is null of the tips.
   The dipole is 2.12 dB over isotropic and is and electrical halfwave.
   Can be arranged vertically or horizontal. It is a linear antenna.
 o Inverted Vee
   This antenna is a dipole with sloping elements.
   The antenna is omni-directional for the most part.
   It's overall gain is less than a dipole because of the omni pattern.
 o Rhombic
   This is a rather large antenna. Rhombics can be various lengths total.
   In the UHF range,19 wavelengths is common.
   In HF,4 and up is common. This antenna requires some land depending on the
 frequency.
  A rhombic is good to twice it's design frequency, directional,and fixed.
 o Terminated longwire
   Requires some space,but performs well. Directional with a wider bandwidth
 than the longwire at shorter lengths.
 o Sloping Vee
   Similar to the Inverted Vee,the sloping vee is semi-directional.
   Easy to install,inexpensive,and easy to build.
 o Beverage
   Good all band antenna with a tuner. Easy to build and set-up.
   Requires some space and not suitable for small lots.
 o Marconi
   Large antenna requiring some space,but good for the lower HF bands.
   Semi-directional,the marconi is easy to build and cheap to construct.
 o Folded Marconi
   Cheap and easy to install antenna. Made from 300 Ohm ribbon cable (TV).
   Set up in a `hockey stick' form. Use a tuner.
   Works well in the 40-160 range. Requires a ground plane.
 o Loop
   Consists of a full wave length and can be set-up horizontally or 
ertically
 polarized with the antenna in the vertical position or set-up parallel to 
he
 ground for lower frequencies.
 o Sloper
  Common design for most hams.
  Antenna is a slooping dipole or sloping quarter wave.
  Easy to bulid and install.
  Semi-directional in the direction of the slope.
-WS
--- GoldED 2.42.G1219
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* Origin: VE3SJN....Moderator....HAM_TECH (1:163/506.4)

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