11th June 2010
A semi-finalised implementation of the passive air-band receiver and field testing while I was travelling in the US.
Parent article: Non-Emissive Airband Receiver.
27th March 2010
A tuned loop antenna with an active push-pull buffer featuring phantom powering via the coax feed.
29th January 2009
A small variometer-style variable inductor as a prototype study of an interpolating inductor for an antenna matching unit.
13th January 2009
I finally put up my discone antenna after many years of kicking it around the balcony and also install the weather station my parents gave me for my birthday.
10th January 2009
Mathias Katzar builds an all-brass UHF Log-Periodic antenna.
Parent article: UHF Log-Periodic Array.
23rd December 2008
A two-component fix for the rail-to-rail oscillation of the ALC loop op-amp.
Parent article: MFJ-207 Review.
20th December 2008
Peter VK2TPM loans me his MFJ-269 to try out.
22nd November 2008
My take on the MFJ-207 HF antenna bridge.
Contains 1 sub-article.
28th September 2008
A simple coaxial feedline choke (aka braid-breaker) for antenna experiments.
20th August 2008
Some recent erudition from experiments on the 30 metre antennas.
16th August 2008
I complete and box-up the QRSS beacon, and experiment with a vertical antenna.
Parent article: 30 Metre QRSS Beacon.
10th August 2008
I get a basic QRSS beacon going on 30 metres.
Contains 3 sub-articles.
3rd August 2008
Summary of the reports received for the 80 metre beacon experiment.
Parent article: 80 Metre CW Beacon.
2nd August 2008
My slightly revamped return-loss bridge and using it for various measurements.
27th July 2008
Lots of pictures from the ARNSW Trash and Treasure and Homebrew Group meeting.
13th July 2008
I finally rig up a vertical antenna for my 80 metre CW beacon.
Parent article: 80 Metre CW Beacon.
29th June 2008
I put the 80 metre beacon in a box and do some more work towards an antenna for it.
Parent article: 80 Metre CW Beacon.
8th March 2008
A small transmitting loop antenna for 20 metres using a Aluminium bicycle wheel rim.
16th December 2007
Some experiments with a tuned receiving loop for HF.
21st October 2007
Peter and I take some assorted radios and antennas to the Fairfax Walking Track at North Head NSW.
2nd June 2007
A quickie hack that actually worked pretty well.
26th May 2007
A twinlead j-pole design for 2 metres gives rise to measurements of velocity factor for VK-available twinlead.
26th May 2007
A very simple 2 metre AM transceiver from Roger Lapthorn G3XBM.
11th March 2007
My cute little EFHW tuner with in-built VSWR bridge.
14th January 2007
My experiments with the VK2ZOI Flower-Pot antenna for 2 metres.
13th January 2007
A very easy to get going VHF impedance bridge for antenna work.
11th November 2006
A quick folded dipole antenna for 3 metres.
14th April 2003
Parent article: UHF Log-Periodic Array.
6th April 2003
A simple VLF/ULF magnetic field probe for taking a quick aural measure of the local mains noise. It also works well as a cable-in-wall locator.
4th April 2003
Going LF/VLF/ULF with a large multi-turn loop.
22nd December 2002
Demodulation of microwave radiation using a Neon plasma.
25th November 2001
A simple tuned-loop I threw together for DFing a local noise source that has been effecting my father's nightly listening to 2BL 702 kHz.
Contains 1 sub-article.
27th October 2001
A classic 6dBi LPA design for the Australian UHF TV broadcast bands IV and V. Initial tests indicated excellent pattern performance with ultra deep nulls.
Contains 2 sub-articles.