Test Results - JBX21WB vs. ATF-X100

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.

Date: 08/05/01

I have built a custom antenna from scratch. I have been testing this antenna for the past three weeks. A one day test is not enough, because of the changes in weather and atmosphere conditions. I conducted the tests below today within a 2 hour window and I got very consistent results.

This new antenna allows everything to be adjustable:
-number and length of reflectors
-number, length, and spacing of director elements
-size and spacing of pickup element
-length of boom
-vertical tilt angle

Right now, I have only experimented with pickup elements. I tried the Blake PCB balun and pickup and four different custom made pickup elements using a standard channel Master balun.

The first test is the Blake JBX21WB. The rest are my custom antennas.


==================================================
ANTENNA= BLAKE JBX21WB
NUMBER OF REFLECTORS= 16
PICKUP ELEMENT LENGTH= 13.75"
BALUN= NEW BLAKE P.C.B.
AMP= CM-7775
MAST HEIGHT= 8'
VERTICAL ANGLE= +10 DEGREE
==================================================
MT. WILSON, LOS ANGELES, DIST= 15.5 MILES
KTLA 31...56-57
KNBC 36...48-51
KCAL 43...N/A
KABC 53...0-50
KCET 59...0-50
KCBS 60...0-48-51
KTTV 65...0-51-56
KCOP 66...0-50
MT. SOLEDAD, SAN DIEGO, DIST= 113 MILES
KGTV 25...87-93
KNSD 40...0-50
KFMB 55...88-90
MT. SAN MIGUEL, SAN DIEGO, DIST= 132 MILES
KSWB 19...68-73
KPBS 30...N/A
TIJUANA, DIST= 138 MILES
XETV 23...81-83


==================================================
ANTENNA= CUSTOM
NUMBER OF REFLECTORS= 16
PICKUP ELEMENT LENGTH= 13.75"
BALUN= BLAKE P.C.B.
AMP= CM-7775
MAST HEIGHT= 8'
VERTICAL ANGLE= +10 DEGREE
==================================================
MT. WILSON, LOS ANGELES, DIST= 15.5 MILES
KTLA 31...59-62
KNBC 36...59-61
KCAL 43...N/A
KABC 53...0-50
KCET 59...0-50
KCBS 60...47-51
KTTV 65...0-50
KCOP 66...N/A
MT. SOLEDAD, SAN DIEGO, DIST= 113 MILES
KGTV 25...87-90
KNSD 40...62-66
KFMB 55...89-90
MT. SAN MIGUEL, SAN DIEGO, DIST= 132 MILES
KSWB 19...73-81
KPBS 30...N/A
TIJUANA, DIST= 138 MILES
XETV 23...77-80


==================================================
ANTENNA= CUSTOM
NUMBER OF REFLECTORS= 16
PICKUP ELEMENT LENGTH= 13.75"
BALUN= CM
AMP= CM-7775
MAST HEIGHT= 8'
VERTICAL ANGLE= +10 DEGREE
==================================================
MT. WILSON, LOS ANGELES, DIST= 15.5 MILES
KTLA 31...64-65
KNBC 36...58-61
KCAL 43...0-50
KABC 53...N/A
KCET 59...0-50
KCBS 60...0-43-60
KTTV 65...0-50
KCOP 66...N/A
MT. SOLEDAD, SAN DIEGO, DIST= 113 MILES
KGTV 25...89-93
KNSD 40...74-75
KFMB 55...78-79
MT. SAN MIGUEL, SAN DIEGO, DIST= 132 MILES
KSWB 19...96-98
KPBS 30...N/A
TIJUANA, DIST= 138 MILES
XETV 23...81-83


==================================================
ANTENNA= CUSTOM
NUMBER OF REFLECTORS= 16
PICKUP ELEMENT LENGTH= 16.5"
BALUN= CM
AMP= CM-7775
MAST HEIGHT= 8'
VERTICAL ANGLE= +10 DEGREE
==================================================
MT. WILSON, LOS ANGELES, DIST= 15.5 MILES
KTLA 31...65-67
KNBC 36...59-61
KCAL 43...0-50
KABC 53...N/A
KCET 59...0-50
KCBS 60...0-50
KTTV 65...0-50
KCOP 66...N/A
MT. SOLEDAD, SAN DIEGO, DIST= 113 MILES
KGTV 25...81-84
KNSD 40...67-73
KFMB 55...79-80
MT. SAN MIGUEL, SAN DIEGO, DIST= 132 MILES
KSWB 19...85-89
KPBS 30...N/A
TIJUANA, DIST= 138 MILES
XETV 23...67-68


==================================================
ANTENNA= CUSTOM
NUMBER OF REFLECTORS= 16
PICKUP ELEMENT LENGTH= 20"
BALUN= CM
AMP= CM-7775
MAST HEIGHT= 8'
VERTICAL ANGLE= +10 DEGREE
==================================================
MT. WILSON, LOS ANGELES, DIST= 15.5 MILES
KTLA 31...59-61
KNBC 36...49-52
KCAL 43...0-50
KABC 53...N/A
KCET 59...0-50
KCBS 60...0-50
KTTV 65...0-50
KCOP 66...N/A
MT. SOLEDAD, SAN DIEGO, DIST= 113 MILES
KGTV 25...81-90
KNSD 40...63-67
KFMB 55...78-79
MT. SAN MIGUEL, SAN DIEGO, DIST= 132 MILES
KSWB 19...80-83
KPBS 30...N/A
TIJUANA, DIST= 138 MILES
XETV 23...90-94


==================================================
ANTENNA= CUSTOM
NUMBER OF REFLECTORS= 16
PICKUP ELEMENT LENGTH= 13.75" BOWTIE SHAPE SHAPE
BALUN= CM
AMP= CM-7775
MAST HEIGHT= 8'
VERTICAL ANGLE= +10 DEGREE
==================================================
MT. WILSON, LOS ANGELES, DIST= 15.5 MILES
KTLA 31...65-68
KNBC 36...63-64
KCAL 43...0-50
KABC 53...N/A
KCET 59...0-50
KCBS 60...49-53
KTTV 65...0-50
KCOP 66...N/A
MT. SOLEDAD, SAN DIEGO, DIST= 113 MILES
KGTV 25...88-93
KNSD 40...63-66
KFMB 55...77-78
MT. SAN MIGUEL, SAN DIEGO, DIST= 132 MILES
KSWB 19...71-77
KPBS 30...N/A
TIJUANA, DIST= 138 MILES
XETV 23...83-86

Conclusion: