ad: seapac-1
Please login help/register
callsign: password: secure login
Database News Forums Swapmeet Resources Contact
 00:21:31 UTC 19 Apr 2014 
Advanced Search Current Hot Callsigns XML Logbook Data QSL ListMaker Database Downloads DX Spotting Network Ham Club Database QSL Corner Top Web Contacts Expired Callsigns Daily Update Reports Just Added Callsigns Database Help Forum
Amateur Radio News General Announcements Special Events, Contests, etc. Hamfests and Conventions Silent Keys Headlines
Forums Home Discussions, Editorials, Talk Technical Forums Logging and Contesting RV and Mobile Help Forums
Ham Radio Gear for Sale Ham Made Gear General Merchandise Swapmeet Hot List Ham to Ham References Stolen Radios, Scams and Rip-offs
Site Menu... Practice Amateur Radio Exams Amateur Radio Study Guides Online License Renewals License Wall Certificates Commercial Ham Radio Links DX Country Atlas Grid Mapper Ham Radio Trivia Quiz Life Member Honor Roll
Help Desk, for accounts, lost passwords, etc. Add your callsign to QRZ Subscription Services Users Help Forum Frequently Asked Questions - FAQ QRZ en Espanol Privacy Statement Advertise with QRZ List of Current Advertisers About QRZ Donate to QRZ Contact us
ad: L-HROutlet
ad: l-assoc
ad: l-rl
ad: l-gcopper
ad: l-innov
ad: l-AmericanRadio
ad: l-tentec
ad: l-BCInc
ad: l-Waters
  QSL image for VK3FFB

VK3FFB Australia flag Australia

Login is required for additional detail.

[+] Mailing label


Lookups:   9119 Ham Member

Email: Login required to view

Back on air since August 2011. Currently using:

rig: IC-756 PRO-III - 100W barefoot+

SDR: Funcube Dongle Pro+ with CW Skimmer and RBN upload: http://www.reversebeacon.net/dxsd1/dxsd1.php?f=0&c=vk3ffb&t=de


10m: cubical quad

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

QSL Cards: Presently no paper QSL cards. Only eQSL possible


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 microwave component design. Presently, I am engaged in high-power broadcast filter design from a few 100 watts to over 20kW, mainly in the UHF TV band. I hold a number of patents, have published papers and since February 2012 I am a Bell Labs DMTS member.


Former callsigns: 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



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:





Flag Counter

Last modified: 2014-04-12 22:10:25, 11255 bytes

Login Required

Login is required for additional detail.

You must be logged in to file a report on this page

Please login now...

Currently updating logbook display.
ad: giga-db
Copyright © 2014 by QRZ.COM
Sat Apr 19 00:21:31 2014 UTC
CPU: 0.044 sec 42954 bytes mp