[Antennas] NZNEC model of a C-Pole vs a vertical dipole?

[Brian Cake]

Hello Niel,

    When I designed the C-pole I did compare it with a conventional 1/4 wave 
vertical antenna over a ground plane (I think you probably meant lambda/4 
and not lambda/2). This was at 3.75 MHz, and these are the EZNEC results, 
with medium soil (conductivity=0.005S and dielectric constant=13) :

                                                                          Gain 
Take-off angle 
Gain    Take-off angle

            Vertical with 120 lambda/4 radials    +0.46dBi     25 degrees 
C-Pole with no radials (lowest wire 10" above ground)   -0.5dBi    22 
degrees

                                                                             
                                      C-pole with no radials (lowest wire 
12'  above ground)    0dBi        20 degrees

            Vertical with 60        "        "    "            +0.3dBi 
"

                "            "    30        "        "    "            0dBi 
"

                "            "    15        "        " 
     -0.5dBi            "

    These results are in "The ARRL Antenna Designer's Notebook", along with 
other C-pole stuff.

    The C-pole will work fine with very small separation between the 
vertical wires. I have used 2" with 1/16" wire in the past and the results 
are a reduction in gain by about 1dB in a C-pole cut for the 20m band. One 
disadvantage is that the height of the "skinny" 20m C-pole increases by 
almost 8' from 16' to almost 24'.

    Hope this helps.

    73

    Brian KF2YN







-----Original Message----- 
From: Niel - W0VLZ
Sent: Saturday, November 16, 2013 10:24 AM
To: antennas at mailman.qth.net
Subject: [Antennas] NZNEC model of a C-Pole vs a vertical dipole?

Has anyone done a NZNEC model of a C-Pole ( a vertically oriented off
center fed folded dipole and see
http://w0vlz.blogspot.com/2010/05/c-pole-antenna-for-qrpxpeditions.html
)versus a vertical half wave dipole?

Also, what does NZNEC say if the width of a C-Pole is squeezed down to
about an inch (the width of 450 ohm window line)?

73,
Niel - W0VLZ



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