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HOLD DOWN KEY : Ctrl & ROLL THE MOUSE WHEEL
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INTRODUCTION TO THE vk2iau allcoax multiband antenna
The vk2iau coax multiband antenna is an RG58U coax cable multi strand core antenna configuration of 4 interchangeable
components , as follows:
A: antenna A = INVERTED V DPLE = 2.15m long EITHER SIDE OF THE INV V DPLE APEX . coax cable outer
braid radiating elements in parallel , plus feedline coax to radio
B: antenna B = SINGLE 2.15m long coax cable outer braid radiating elements in series,
plus feedline coax to radio
C: 3.5 metre long shorted coax , AS A COIL , counterwound on a small plastic cable drum and held in place by cable ties , the drum is then
covered in aluminium foil which is independantly earthed , all of this is then covered in a nylon stocking to protect the aluminium foil.
D: 4 metre long shorted coax , AS A COIL , as above
Note: ALL EXPOSED PARTS ARE COVERED IN ‘ ROOF & GUTTER SILICON “ , which , when cured is wrapped in electrical
tape note: impedance at the radio is achieved fully or in part by COMBINATIONS OF THE 4 interchangeable components
( as described above ) , to utilise inductance / capacitance to extend the the " frequency time " longer than the " frequency
physical length time of the radiating elements " thus preventing the signal from hitting a brick walland bouncing back as unwanted SWR .
NOTE 1: I have found the antenna system COMPACT and excellent for TX and RX from my 6m boat
NOTE 2: The coax cable is laid on the roof tiles of my house , very inconspicuos , almost " secret " . COULD BE USED DIGUISED
AS A WASHING LINE
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HOLD DOWN KEY Ctrl & ROLL THE MOUSE WHEEL
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VK2IAUALLCOAXMULTIBANDANTENNA (BMCA refer log book 1-9-18 )
ANTENNA A ONLY ( INV. V DIPOLE ) / mm ( SHOWBOAT )
NOTE: CPO means COAX CENTRE PIN ONLY FT991A
MODE FREQ. TX PWR SWR SWR ATU NOTES
# CW 1.805 5 MAX 2 2 ON DPLE CPO
NO COILS
# CW 1.805 5 MAX 2 2 ON ALL 3 CPO
# CW 1.805 5 MAX 2 OFF ALL 3 CPO
# LSB 1.810 5 MAX OFF DPLE CPO
# LSB 1.810 5 MAX 2 2 ON NO COILS
VK2IAUALLCOAXMULTIBANDANTENNA (BMCA refer log book 1-9-18 )
ANTENNA A ONLY ( INV. V DIPOLE ) / mm ( SHOWBOAT )
# UNLESS OTHERWISE STATED ALL 3 SCREWED ONTO RADIO
( BOTH COILS & ANTENNA FEEDLINE )
# RED = ATU HELD IN UNTIL FLASHING
YEASU FT991A HF/50 CONNECTION
NOTE: CPO = CENTRE PIN ONLY of coax
MODE FREQ. TX PWR SWR SWR ATU NOTES
# CW 3.505 100 ON ALL CONFIGS
# LSB 3.518 100 OFF ALL CONFIGS
VK2IAUALLCOAXMULTIBANDANTENNA (BMCA refer log book 1-9-18 )
ANTENNA A ONLY ( INV. V DIPOLE ) / mm ( SHOWBOAT )
# UNLESS OTHERWISE STATED ALL 3 SCREWED ONTO RADIO
( BOTH COILS & ANTENNA FEEDLINE )
# RED = ATU HELD IN UNTIL FLASHING
YEASU FT991A HF/50 CONNECTION
NOTE: CPO = CENTRE PIN ONLY of coax
MODE FREQ. TX PWR SWR SWR ATU NOTES
# CW 7.000 5 NIL OFF
100 NIL “
“ 7.020 5 NIL “
“ 100 NIL “
“ 7.060 5 NIL “
“ 100 1.1 “
“ 7.100 5 2.7 1.35 “
“ 100 2.9 1.35 “
“ 7.150 5 2.8 1.1 “
“ 100 2.9 1.1 “
“ 7.200 5 1.1 “
“ 100 1.1 “
“ 7.250 5 2.2 “
“ 100 2.5 “
CW 7.300 5 2.5 “
100 2.5 "
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MODE FREQ. TX PWR SWR SWR ATU NOTES
# LSB 7.060 5 NIL OFF
100 NIL “
“ 7.100 5 1.35 “
100 1.35 “
“ 7.150 5 1.1 “
100 1.1 “
“ 7.200 5 1.1 “
100 1.1 “
“ 7.200 5 N1L “
100 1.1 “
“ 7.250 5 1.1 “
100 1.1 “
# UNLESS OTHERWISE STATED ALL 3 SCREWED ONTO RADIO
( BOTH COILS & ANTENNA FEEDLINE )
# RED = ATU HELD IN UNTIL FLASHING
YEASU FT991A HF/50 CONNECTION
NOTE: CPO = CENTRE PIN ONLY of coax
MODE FREQ. TX PWR SWR SWR ATU NOTES
# CW 10.100 5 2.1 OFF
100 2.7 “
“ 10.110 5 2.1 “
100 2.4 “
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MODE FREQ. TX PWR SWR SWR ATU NOTES
# USB 10.110 5 2.1 OFF
100 “
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“ 10.120 5 2.1 “
100 “