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Contact Details
Peter Miles
Northam, Western Australia
QRZ Page: VK6YSF
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R.F. CURRENT METER
This R.F. current meter
was developed to assist in measuring line currents in balance feed lines
as used in the All Band HF Antenna.
It is often useful to be able take measurements of RF current in the
antenna system and the primary need that I had was to confirm the
balanced RF current in each leg of the ladder line used on my
multiband dipole.
A
balanced antenna system requires that each half of the dipole
including each side of the transmission line be a near mirror image
and should also avoid nearby trees and structures in particular
metallic structures. When the system is balanced the transmission
line will have equal, but opposite current flowing in each line.
This will cancel out any radiation or reception on the transmission
line.
My
test to confirm a balanced antenna system was to simple measure the
RF current in each leg of the transmission line as it leaves the
Z-match tuner. Accurate determination of the current while desired
is not entirely necessary providing the measurement is consistent
for each transmission line leg.
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| Photo 1 Front view of the R.F. current meter
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Photo 2 Top view showing current selection switch |
Photo 1 Internal
view of the RF current meter
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OF PAGE
Page
last revised 12 March 2023
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Space Weather
https://www.swpc.noaa.gov/
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Lee de Forest
born 26 August 1873
An American inventor and pioneer of radio electronics. His invention of the Audion triode vacuum tube in 1906 made electronic amplification possible and helped lay the foundation for modern radio, television and electronics.
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Notice Board
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VK6YSF JS8Call and
Olivia 8/250 operations.
Current activity is generally
focused - though not restricted to - JS8Call operations on the 20,
30m, and 40m bands.
Olivia 8/250 is used occasionally on the 20m band.
Proposed
band and mode activity
is often communicated on HamSpots: https://hamspots.net/js8/
or my profile on
X: https://x.com/vk6ysf97230
.
Post
date: 29 July 2026
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Local
Repeaters
Repeaters Page Updated
- Expanded and refreshed information on VHF and UHF repeaters across Western Australia's Central Coast, Perth, the Avon Valley, and the Peel region. New AllStar Link information has also been added, including linked repeater details and
gateway information across the State.
See: https://vk6ysf.com/local_repeaters.htm
Post
date: 27 July 2026
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MARMOTSat
Amateur radio CubeSat
now successfully in orbit
Payload includes:
145.875 MHz – AX.25 packet digipeater
436.125 MHz – Telemetry & command (digital)
29.410 MHz – CW telemetry beacon, DVB-S2 experiments.
https://marmotsat.ca
https://www.propagationlab.ca/satellite/
Tracking: SatNOGS
DB - MARMOTSat
Post
date: 29 July 2026
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Western Australian SSTV net
Popular
Western Australian SSTV net for both digital and anolog SSTV.
Generally
found at 7214.0kHz LSB every afternoon from 08:00 UTC (4:00pm WST)
For more
details: https://www.wasstv.net/wasstv.net/index.html
Post
date: 8 December 2025
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VK6MJM LF (136kHz) and MF (474kHz) Beacon
VK6MJM is a LF/MF station
located in Manjimup, Western Australia.
Common Mode: FST4W 300 (Similar to
WSPR)
Note:
other modes and sub-modes may be used.
Station details were presented by
Peter Hall (VK6HP) at PerthTech 2024.Presentation PDF: Peter
Hall VK6HP at PerthTech
QRZ Page: VK6MJM
on QRZ.com
Post
date: 10 March 2025
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