16 SPECIFIC TEST CONFIGURATIONS

BEFORE VIEWING THE TEST RESULTS,  it is very important to understand the Road Map through the tests.

 

It was determined that every test should be run with:


  • 4 different lengths of coax:
  1. Typical Portable Length:  11m for the dipoles;  12m for the OCFD's.  This was only slightly longer than the CMC Best Case length, which would be an electrical quarter wavelength using the Velocity Factor for CMC on coax which we estimated to be 0.95).
  2. Electrical Half Wavelength:  The Velocity Factor of the coax (0.66) is used to determine this.  (This reproduces the actual characterics of the feedpoint)
  3. Worst Case Length: Electrical Half Wavelength (Velocity Factor for CMC on coax (0.95) was used)
  4. Worst Case Length, Skewed: Same as #3, but with the coax pulled away from the feedpoint in the air, running close to one side of the antenna, instead of straight down the pole like with #3.

 

  • 4 different configurations:

a)  Analyzer or TX:  no ground and no choke.

b)  Analyzer or TX:  coax shield grounded at Analyzer or TX

c)  Analyzer or TX:  with choke but not grounded

d)  Analyzer or TX:  with choke and with Analyzer or TX grounded

 

CONFIGURATION SUMMARY (TOTOAL 16):

 

Config. 1: Typical Portable length

1a: no ground, no choke

1b: grounded but no choke

1c: with choke but not grounded

1d: with choke and grounded

 

Config. 2: Electrical Half Wavelength

2a: no ground, no choke

2b: grounded but no choke

2c: with choke but not grounded

2d: with choke and grounded

 

Config. 3:  Worst Case Length

3a: no ground, no choke

3b: grounded but no choke

3c: with choke but not grounded

3d: with choke and grounded

 

Config. 4:  Worst Case Length, Skewed

4a: no ground, no choke

4b: grounded but no choke

4c: with choke but not grounded

4d: with choke and grounded

 

THIS PATTERN OF 4 SETS OF 4 CONFIGURATIONS

WILL BE FOLLOWED THROUGHOUT THE TEST

FOR ALL ANTENNAS.

TEST CONFIGURATION ROAD MAP:

 

 

The configurations above are a bit difficult to read as shown here as a jpeg image.

I have also saved these configurations to a PDF which  shows them much clearer.

DOWNLOAD BELOW:

16 Test Configurations (PDF)
This file shows pictures for the 16 test configurations for testing SWR and other basic antenna characteristics. For measuring CMC, the antenna analyzer was replaced by a transceiver.
BASIC SWR TEST CONFIGURATIONS_small.pdf
PDF-Dokument [747.5 KB]

 

FINAL NOTE:

  • This file and the pictures shown above show the 16 test configurations for measuring SWR and other basic antenna characteristics.  
  • For measuring CMC, I used the same 16 configurations, EXCEPT the antenna analyzer was replaced with a transceiver.