vk2iau-coax-multiband-antenna
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MY Tx PERFORMANCE RECORDINGS using the vk2iau coax multiband antenna
NOTE: MUCH HAS BEEN OMITED TO MINIMISE REPETITION
NOTE: UNLESS OTHERWISE SHOWN UNDER “ NOTES “ BOTH ANTENNAS ARE SCREWED ON AT THE RADIO and BOTH COILS ARE SCREWED ON AT THE RADIO .
TX watts SWR ATU NOTES
CW ON
1.812 5 3
100 3
1.815 5 2.8
100 2.8
1.820 5 2.4
100 2.8
1.830 5 1.7
100 1.7
LSB ON
1.812 5 1
100 1.2
1.815 5 1
100 1.2
1.820 5 1
100 1.2
1.830 5 1
100 1.2
1.875 5 MIN
100 1.1
CW ON
3.500 5 NIL
100 1
3.510 5 1
100 1
3.782 5 NIL
100 1
CW OFF
3.500 5 1.7
100 1.8
3.510 5 1.7
100 1.7
3.782 5 1.1
100 1.1
LSB ON
3.535 5 NIL
100 MIN
3.580 5 NIL
to
3.782 100 MIN
CW ON
7.000 5 NIL
100 1
7.020 5 NIL
100 1.25
7.100 5 NIL
100 1
7.300 5 1
100 1.25
CW OFF
7.000 5 2.2
100 2.5
7.100 5 1.7
100 1.8
7.300 5 1.7
100 1.8
USB ON
7.060 5 MIN
100 1
7.300 5 NIL
100 MIN
CW ON NO COILS
10.100 5 1.05
100 1.25
10.135 5 MIN
100 1.05
CW OFF NO COILS
10.100 5 3.5
100 3.7
10.135 5 3.3
100 3.7
USB ON NO COILS
10.120 5 MIN
100 1
10.135 5 NIL
100 MIN
CW ON NO COILS
14.000 5 MIN
100 1.2
14.030 5 NIL
100 1.2
14.240 5 1
100 1.25
14.350 5 NIL
100 1
CW OFF BOTH COILS CENTRE PIN ONLY ( CPO )
14.000 5 1.8
100 2.3
14.130 5 2
100 2.4
USB ON NO COILS
14.130 5 NIL
100 NIL
14.350 5 NIL
100 NIL
CW ON NO 3.5m COIL
18.068 5 1
100 1.2
18.130 5 1
100 1.05
18.160 5 1
100 1.2
CW OFF
18.068 5 1.8
100 2.2
18.160 5 1.8
100 2
USB ON NO 3.5m COIL
18.110 5 MIN
100 1
18.168 5 NIL
100 MIN
CW OFF NO COILS
21.000 5 NIL
100 1
21.040 5 NIL
100 NIL
21.140 5 1
100 1
USB OFF NO COILS
21.150 5 NIL
100 MIN
21.450 5 NIL
100 NIL
CW ON BOTH COILS CPO
24.890 5 1.25
100 1.3
24.950 5 1
100 1.25
USB ON NO COILS
24.960 5 MIN
100 1.2
24.990 5 MIN
100 1.2
CW ON NO COILS ANT. B CPO
28.000 5 MIN
100 1
29.100 5 NIL
100 NIL
USB ON NO COILS ANT. B CPO
28.300 5 NIL
100 MIN
29.100 5 NIL
100 1
FM REPEATERS ON NO 4m COIL 3.5m COIL CPO
29.120 5 1
100 1.25
29.620 5 NIL
100 NIL
( REMINDER = UNLESS OTHERWISE SHOWN BOTH ANTS . & BOTH COILS ARE SCREWED ON )
CW ON BOTH ANTS. CPO BOTH COILS CPO
50.000 5 NIL
100 1.2
50.300 5 NIL ANT. B CPO
100 NIL BOTH COILS CPO
50.600 5 NIL ANT. A CPO
100 1.2 4m COIL CPO NO 3.5m COIL
52.000 5 NIL 4m COIL CPO
100 1 NO 3.5m COIL
USB ON BOTH ANTS. CPO BOTH COILS CPO
50.500 5 NIL
100 1
51.000 5 NIL
100 1
52.000 5 NIL
100 1
FM SIMPLEX ON
50.000 5 MIN BOTH ANTS CPO
100 1 BOTH COILS CPO
51.000 5 1 BOTH ANTS. CPO
100 1 NO COILS
52.000 5 1 BOTH ANTS. CPO
100 1.05 NO COILS
USB NO COILS
NOTE: This was connecting to the FT991A HF/50 coax connection
144.100 5 NIL
50 1.5
144.300 5 NIL
100 1.25
CW & FM WERE TOO HIGH SWR with the FT991A HF / 50 connection
NOTE: The results for the FT991A 144 / 430 connection are shown next , AND INCLUDE CW and FM
CW FT991A Connecting to the 144 / 430 ANT. A CPO
144.100 5 NIL BOTH COILS CPO
100 2.2
432.100 5 NIL
50 1
434.000 5 NIL
50 NIL
FM FT991A Connecting to the 144 / 430 ANT. A CPO
145.100 5 NIL BOTH COILS CPO
50 1.5
CW FT991A Connecting to the HF/50 coax connection NO COILS
432.100 5 2
50 2
434.000 5 2.5
50 2.5
434.775 5 2
50 2
USB Connecting to the HF/50 coax with the FT991A , NO COILS
432.100 5 MIN
50 1.3
434.000 5 1.2
50 1.5
USB FT991A Connecting to the 144 / 430 ANT. A CPO
434.000 5 NIL BOTH COILS CPO
50 1
END OF MY Tx PERFORMANCE RECORDINGS
MY CONCLUSIONS
IT IS MY ( VKIAU John ) HOPE THAT OTHERS WILL ENHANCE / IMPROVE THE SIMPLICITY / PERFORMANCE OF THIS COAX MULTIBAND ANTENNA .
MY THANKS TO VK2FMJW Marcus FOR HIS EXTENSIVE TIME AND INTEREST IN TESTING THIS ANTENNA , AND ALSO MY THANKS TO THE USERS OF REPEATER VK2RMP FOR THEIR PATIENCE WHEN VK2FMJW Marcus AND MYSELF WERE HOPPING BACKWARDS AND FORWARDS BETWEEN HF BANDS AND THE REPEATER .
72 / 73 TO ALL FROM VK2IAU John VA E E