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VK3FFB Australia flag Australia

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Ham Member Lookups: 14947


Back on air since August 2011. Currently using:

rig: IC-756 PRO-III, IC-7100 - both 100W barefoot+, Rx2: FCDP+ SDR


10m: cubical quad, fed via ATU at mast to cover 17m, 15m, 12m as well

20m - 80m: 80m delta loop with balanced feeder & symmetrical PI matching unit For details see schematic below.

6m: 4-el Yagi (by Paul, VK3KHZ)

2m: 8-el Yagi 

Preferred modes: CW, JT65/JT9, WSPR1), FSK441 for 6m MS, SSB


QSL Cards: Only eQSL


Link to my personal ham radio Google web site

1) If you copied me in WSPR mode, feel free to drop me an e-mail. Always pleased to hear from other hams around the world.


My interest in radio was triggered by my high-school science & math teacher. First Rx was a 0-V-1 with the ECL80 tube. With this I discovered the world of ham radio. My first on air ham radio teachers were Arno, DL9AH and Mario, DJ7UA and many others I used to listen to. SWL-ing was another domain that interested me a lot during my early radio years.

In 1982 I re-discovered the magnetic loop antenna for ham-radio and published an article, together with ham friends (cq-dl 9/82 p. 435). This paper found strong interest and caused a loop building avalanche among hams in Europe and commercial versions appeared soon thereafter.

By profession I am a microwave r&d engineer specialised in filter design and general passive low and high-power microwave component design. Presently, I am engaged in the design of passive high-power components from a few 100 watts to over 300kW, mainly in the UHF band. I hold a number of patents, have published papers and since February 2012 I am a Bell Labs DMTS member.

Former callsigns held: DF3IK, VU2DPG


CW Skimmer and Reversebeacon

Link to my RBN spots:�http://www.reversebeacon.net/dxsd1/dxsd1.php?f=0&c=vk3ffb&t=d

See what I do with the skimmer data below. My main interest is in 10m beacon spotting with an SDR Rx. The SDR processes the entire 10m cw beacon band, decodes and uploads to the RBN website. Short video of cw skimmer screen: http://youtu.be/_5tLutjRtCc.

More info on my cw skimmer & RBN operation is on my Google site.


PSK Reporter

Good website to check what's on and where your digi mode signal reaches


MS signals from VK7RAE on 50.057MHz. the continuous signal (horiz. line) is VK7RAE via tropospheric propagation. In spite of the distance, I usually get VK7RAE with a moderate to weak signal here. The meteor scatter event signal spreads out in frequency due to the doppler shift caused by the movement of the reflecting ionisation trace and due to multiple meteor traces. The latter are probably caused by disintegration of the meteor upon impact. The meteor particles then probably move away from the impact spot at different angles.


Spectrograph screenshot from IPS website. Big solar radio burst on 24th October, 2014

note: horizontal lines are man-made signals received by the spectrograph Rx.


Beacon signal recording with S-Meter Lite

Corresponding Spectrograph screenshot showing coincidence of radio signal (S-Meter lite above) and Spectrograph rainbow plot.

Compare the time lines. Clear coincidence and 2nd peak in signal level graph is also confirmed as a second flare with lower intensity and with different time response. For more info on Spectography.


Note the solar panels: total output 4.4 kW (23 panels total). Yes,my station is poweredby the sun !My power bills show credits only. Thanks to my German SMA inverter,there is no radio noise.

The dish on the right side is a C-band SAT TV dish for watching German TV here in Australia.


An evening view from the 80m delta loop feedpoint to the east


south-eastern corner of 80m horizontal delta loop



Balanced Feeder 'Tuned Antenna System'

Below is a schematic of my balanced feeder antenna arrangement using a symmetrical PI-network and a 1:1 balun. This is not my invention, but I like it's simplicity and versatility. For symmetry reasons it is important that both roller inductors are always set to the same inductance value. Thanks to VK3QD and VK3ATC who helped me re-discover the tuned antenna system.


The idea of this arrangement is this: The LC tuner network 'tunes' the antenna and transforms its impedance down to balanced 50 Ohms real. The 1:1 balun then only transforms from a balanced 50Ohms impedance to 50 Ohms unbalanced (coax). It is important to understand, that the balun is running between two real impedances. This is very different from having a balun on the antenna side of an unbalanced tuner, where the impedances are not real. Complex impedances can have extreme values and ferrite core baluns are not usually designed to handle these. (Oops, the variable L's in the circuit below are actually Lmax=15uH)


Reversebeacon network

This is probably the coolest link between ham radio and the internet. When I heard about it, I immediately became a regular user. In short: A global network of amateur cw receiving stations, called 'skimmers' feed their decoded reception data including callsign, signal-to-noise ratio and cw speed to a global server: www.reversebeacon.net. I use it to find out 'where has my cq call been heard ?' So, in practice, you give one or more cq calls on your band of interest and then jump on the internet to see where you have been 'heard' (use the dx spot search feature and type in your own callsign). After doing that, you have a pretty good idea about current propagation conditions and depending on that you may want to give a few more cq calls :)

Check my CW Skimmer: http://www.reversebeacon.net/dxsd1/dxsd1.php?f=0&c=vk3ffb&t=de


VOACAP Online - by OH6BG

Another true 'northern light'! Now we can use professional HF propagation prediction online. Find out whether propagation is likely to exist between two places and what frequency to use. An invaluable tool for the serious DXer: http://www.voacap.com/prediction.html



Carl has a lot of good info on HF & VHF propagation:http://k9la.us/index.html

More from me at Google


Here comes Venus. Improvised setup with a simple telescope and a sheet of white paper & iPhone camera. You can

even see some sunspots ! :

Recent S-meter recording of W5OM 10m Beacon using the fine S-meter Lite software:

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7166931 Last modified: 2016-03-15 06:34:18, 13764 bytes

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QRZ Logbook Summary for - VK3FFB
Latest Contacts for VK3FFB at QRZ.com
dedateband mode grid Country op
VK3RRU 2012-08-15 10m CW PG66pa Australia VK3RRU 10 Meter Beacon
DL0IGI 2012-02-23 10m CW JN57mt Germany 10m Beacon on 28.205 MHz
VK3KHZ 2012-02-09 40m SSB QF22pe Australia PAUL KARLSTRAND
VK2KJJ 2012-01-15 10m SSB QF34qu Australia Knud Joergen Olesen-Jensen
KH7CX 2011-10-13 20m SSB BL11bg Hawaii Alexander G Stengel
KD4EGM 2011-09-28 20m SSB EM84up United States TIMOTHY R TEDROW
DL7OK 2011-09-24 20m SSB JO31kl Germany Dietmar DIT Knorr
RA0CGY 2011-09-23 15m SSB PN78nl Russia Yuri Samyshev
NH7O 2011-09-23 15m CW BL10wp Hawaii Alastair N Couper
XE1REM 2011-09-22 15m SSB EK09kk Mexico PEDRO ESTRADA
DL3AO 2011-09-21 20m SSB JN48pp Germany Rolf Schick
WA4JUK 2011-09-18 20m SSB FM18de United States Joseph W Cagnina, Sr
2E0PBS 2011-09-17 20m SSB IO80so England Paul Sycamore
VK4ARB 2011-09-12 20m SSB QG62mq Australia TREVIOR R BOYD
G4AJA 2011-09-08 30m CW IO91vl England CJ HOARE

Book Totals: 21 qso's   11 confirmed Get a free logbook at QRZ.COM

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