vk2iau-coax-multiband-antenna
INTRODUCTION TO THE vk2iau coax multiband antenna
PART 1 The vk2iau coax multiband antenna is an RG58U coax cable multi strand core antenna configuration of 4 interchangeable components , as follows:
A: antenna A = 2 X 2.15m long coax cable outer braid radiating elements in parallel , plus feedline coax to radio
B: antenna B = 2 X 2.15m long coax cable outer braid radiating elements in series, plus feedline coax to radio
C: 3.5 metre long shorted coax , 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 .
D: 4 metre long shorted coax , as above
Note: ALL EXPOSED PARTS ARE COVERED IN ‘ ROOF & GUTTER SILICON “ , which , when cured is wrapped in electrical tape
note: 50 ohms impedance at the radio is achieved fully or in part by 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 wall and bouncing back as unwanted SWR .
note: I have found the antenna to be excellent for TX and RX from my 6m boat
note: The coax cable is laid on the roof tiles of my house , very inconspicuos , almost " secret " .
PART 2 ATU or NOT
BANDS 80m , 40m , 20m , 17m , 15m do not require an ATU , but the SWR is
slightly more than if an ATU is used . Useful If TX from a boat with no facility to
charge a battery .
BANDS 160m , 12m , 10m , 29FM , 2m , 70cm all require an ATU to fine
tune to 50 ohms impedance at the radio
PART 3 Tx POWER
I ( VK2IAU John ) have loaded to 100 w all the bands shown in PART 2 , and
their modes . The list of qso,s is shown in PART 4
PART 4 LIST OF QSO,s MADE BY VK2IAU John USING THE VK2IAU COAX MULTIBAND ANTENNA
FREQU MODE TX PWR NOTES
VK4BJS 14.032 CW 50 FT890 NO ATU
FK8CE 14.012 CW 40 " " " "
VK4ALK 14.142 USB 40 " " " "
VK2HJW 146.875 FM 10 FT 2800M
VK5LJ 7.041 CW 45
VK1CT 7.025 CW 100 FT890 ATU
VK4BJS 14.030 CW 100 " " " "
W7ABT 14.016 CW 100 " " NO ATU
VK3XU 7.009 CW 90 " " ATU
EA8TR 14.024 CW 100 " " " "
VK5LJ 7.032 CW 100 " " " "
VK3IM 3.525 CW 100 " " " "
VK2ITV 3.575 LSB 50 " " " "
VK3DMX 3.550 LSB 100 " " " "
VK2ATC 14.065 CW 90 " " NO ATU
VK3MRH 7.015 LSB 100 " " ATU
VK7FK 18.140 USB 100 " " " "
FK8CE 14.012 CW 100 " " " "
VK4OP 7.022 CW 100 " " " "
W1YL 7.026 CW 100 " " " "
VK2JDR 7.022 CW 100 " " ' "
VK2FATS 147.250 FM 10 FT2800M
VK3MRH 7.105 LSB 100 FT890 ATU
JK1YMM 21.005 CW 90 " " " "
FK8CE 21.018 CW 50 " " " "
ZL1T 21.035 CW 30 " " " "
VK2COX 7.025 CW 50 " " " "
VK2IO 7.032 CW 30 " " " "
VK4EKA 7.025 CW 60 " " " "
VK2AAF 147.050 FM 5 FT2800M / mm
VK3HY 7.025 CW 50 FT890 ATU
FK8CE 14.018 CW 50 " " " "
JR1MUT 14.043 CW 90 " " " "
VK3AVA 7.025 CW 50 " " " "
VK7CW 14.014 CW 5 FT890 / mm " "
VK5LK 14.147 USB 5 " " " "
VK2WP 146.650 FM 65 " " " "
VK2BJ 3.522 CW 5 FT890 NO ATU
VK7JU 3.610 LSB 5 " " " "
W1YL/7 7.025 CW 50 " " ATU
VK2ATZ 3.579 LSB 5 " " NO ATU
VK3TP 3.523 LSB 5 " " " "
VK2AU 3.600 LSB 5 " " " "
VK4HH 3.612 LSB 5 " " " "
VK7BO 7.035 CW 5 " " ATU
VK4HH 7.155 LSB 5 " " " "
VK7JGD 14.146 USB 100 FT991A ATU
VK2FMJW 146.500 FM 5 FT2800M
" " 146.500 FM 5 " "
" " 50.500 USB 5 FT991A ATU
" " 28.390 USB 100 " " " "
VK2LAW 14.130 USB 100 " " " "
VK2FMJW 1.815 CW 100 " " " "
" " 3.510 CW 100 " " " "
" " 28.390 CW 100 " " " "
" " 28.390 USB 100 " " " "
" " 29.150 FM 100 " " " "
VK4DG 14.260 USB 50 " " " "
VK4AR 7.130 LSB 5 " " " "
VK4FGE 7.025 CW 100 " " " "
VK3HKV 7.179.80 LSB 100 " " " "
VK2FMJW 28.400 CW 100 " " " "
" " 10.110 CW 100 " " " "
" " 18.070 CW 100 " " " "
" " 24.900 CW 100 " " " "
VK3LM 3.565 LSB 100 " " " "
VK2DCJ 146.850 FM 50 " "
VK2FMJW " " FM 50 " "
" " 3.590 LSB 100 " " ATU
" " 7.060 LSB 100 " " " "
VK3HKV 7.178.80 LSB 100 " ' NO ATU
VK2KV " " LSB 100 " " " "
VK2FMJW 21.150 USB 100 " " " "
AS AT 6 SEPT 2018
PART 5 ANTENNA CONFIGURATION COMPONENTS
PHOTOGRAPHS
2 COILS AT REAR OF RADIO
.
.
ANT. A ABOVE GARAGE ROOF
ANTENNA B LAYING ON ROOF TILES NEXT TO THE “J” POLE
2.15 metres OF ANT. B ON ROOF TILES , FROM RIDGE NEAR “J” POLE DOWN
TOWARDS GUTTER
ANTENNAS “A” and “B” / mm
ANTENNAS A and B / mm
ANTENNA “A” / mm
ANTENNA “B” / mm