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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
TO CHANGE THE SIZE OF THE WINDOW :
HOLD DOWN KEY Ctrl & ROLL THE MOUSE WHEEL
TUESDAY 2 nd JANUARY 2024
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ANTENNA 020124
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TEST TX USING A VHF 650mm VERTICAL HELICALLY WOUND ANTENNA IN CONJUNCTION WITH THE 4m COAX SHORTED COUNTERWOUND COIL and the 3.5m COAX SHORTED COUNTERWOUND COIL.
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VK2IAU /mm SHOWBOAT : ANCHORED "CHIPPING NORTON LAKE ( GEORGES RIVER ) ,
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TEST TX. WITH RADIO FT991A ( HF50 or 144/433 RADIO ANTENNA CONNECTIONS ) .
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BOTH SHORTED COAX COILS SCREWEWD ON AT RADIO .
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VHF COAX SCREWED ON AT ANTENNA AND RADIO .
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ATU ON/OFF TOGGLE ONLY MOMENTERALLY PRESSED
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# NOTE : NOT USED = ATU HELD IN UNTIL FLASHING
TEST TX RESULTS
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HF50 PWR watts SWR ATU
CW
1.806 " 100 NON SHOWN NO
" " 100 NON SHOWN YES
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3.506 " 5 MAX. NO
" " 5 MAX YES
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7.006 " 5 MAX NO
" " 5 MAX YES
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10.106 " ALL HIGH
14.006 " ALL HIGH
18.005 " ALL HIGH
21.006 " ALL HIGH
24.908 " 5 NON SHOWN NO
" " HIGH YES
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28.007 " " NON SHOWN NO
" " " HIGH YES
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FM SIMPLEX
VOICE " " NON SHOWN NO
" NON SHOWN YES
29 FM RPTRS HF50
29.120 5 NON SHOWN NO no offset " " NON SHOWN YES
did NOT open RPTR
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51.006 HF50
CW HIGH
USB " 100 NON SHOWN NO
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51.150
CW HIGH
USB " 100 NON SHOWN NO
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51.300
CW HIGH
USB " 100 NON SHOWN NO
51.450
CW HIGH
USB " 100 NON SHOWN NO
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51.600
CW HIGH
USB " 100 NON SHOWN NO
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51.700
CW HIGH
USB " 100 NON SHOWN NO
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53 FM
SIMPLEX
VOICE
53.130 " 5 MAX NO
" " 100 NON SHOWN YES
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53.525
VOICE
53.130 " 5 MAX NO
" " 100 NON SHOWN YES
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All Modes 144/430 N/A
144.325 "
CW 5 MAX
USB "
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145.350 "
CW 5 MAX
USB
145.375 "
CW 5 MAX
USB
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FM RPTRS 144/430 N/A
negative offsett
50w ALLOWABLE MAX.
146.625 5 NON SHOWN
RAZORBACK ( not open rptr)
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146.650 5 MAX
Mt. BINDO
VK2RDX ( not open rptr )
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146.800 10 MAX
HEATHCOTE
VK2RLE ( not open rptr )
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146.850 5 MAX
MADDENS PLAINS
VK2RMP ( not open rptr )
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END OF
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ANTENNA 020124
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TEST TX USING A VHF 650mm VERTICAL HELICALLY WOUND ANTENNA IN CONJUNCTION WITH THE 4m COAX SHORTED COUNTERWOUND COIL and the 3.5m COAX SHORTED COUNTERWOUND COIL.
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VK2IAU /mm SHOWBOAT : ANCHORED "CHIPPING NORTON LAKE ( GEORGES RIVER ) ,
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TEST TX. WITH RADIO FT991A ( HF50 or 144/433 RADIO ANTENNA CONNECTIONS ) .
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73,s from VK2IAU John
ALL SUCCESS FOR 2024 & TRAVEL SAFE
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