Horizontal vs. Vertical Stacking Test

stacked antenna 023.jpg (57681 bytes) vertical stacking 001.jpg (60718 bytes)

Description:

I used two Blake JBX21WB antennas. To confirm that the antennas were working properly and matched in performance I tested each antenna separately first. I used a Spectrum Analyzer to check the waveform for each station. The antennas were very closely matched. 

 

For horizontally stacking I mounted the antennas to my ATF-V100 Vertical Tilter using a custom made boom assembly. This boom assembly uses a fiberglass tube to prevent the boom from becoming a active element in the antenna system. Each antenna mount clamps to the boom and allows for easy adjustments to the spacing between antennas. I had already determined in previous tests that 36-44" spacing worked best, so I used 40". 

 

For vertically stacking I simply mounted both antennas to a common mast. I tested a 32" and 17" spacing.

See below for results and my comments following the tests.

 

Results Definition:

Note: Signal level refers to the Dish 6000 indicator which measures the signal quality based on percentage of errors. As long as the indicator stays above 48-50%, the signal will lock. I assume that if you have over 50% errors, the Dish 6000 does not have enough good signal to decode properly. A reading of 100% would indicate no errors in signal. I have found that at 47% I will see pixelation in the picture and below 46% the picture will drop out completely.

 

**For easier printing, click on image to bring up a separate page containing just results.

Test#1, Date: 03/03/02

 

Spectrum Analyzer Waveforms:

(click on image to enlarge)

Mt. Wilson Stations (15 mile distance)

Antenna A

Antenna B

Horizontal Stacked

36" spacing

Vertical Stacked 

32" spacing

Vertical Stacked 

17" spacing

WB-31A.jpg (56419 bytes)

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WB-31AB-36.jpg (63150 bytes)

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Conclusion: