VK7HH LFA Build and performance
Further to my previous posts on the "hybrid" LFA... I managed to finish construction over the weekend and install it on my tower. At the same time I also decided to…
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January 22, 2018
LFA – baluns, is it self balancing?
Further to my previous post about the LFA, I have now completed construction on my "hybrid" version. The next step is to prepare a balun for the feed. But what balun…
January 18, 2018
Building an 11 element VK7HH LFA yagi
As per my previous post I have been looking at building a LFA yagi. Essentially this is a folded dipole loop turned on its side (i.e. mounted parallel with the rest of…
January 10, 2018
YU7EF EF0606 vs G0KSC 6m LFA – Part 1
Sometime ago I built a decently sized 6m yagi here at home - a YU7EF EF0606. This yagi has performed very well over the past few years, and I've had to…
December 17, 2017
PCBWay – PLL circuit voter project
A PLL was needed to lock the 9.6MHz OCXO reference that the voter board uses to GPS. KC2IRV came up with a circuit, and sent me the gerber files. Once…
May 17, 2017
KL70 Audio Response
Further to my simulcasting post. Initial testing indicated some distortion, especially with CTCSS tones in overlap. Voice was reasonable, but did "tear" in some areas and was distorted. To eliminate a…
March 22, 2017
More tropo openings – weekend of 18th/19th March
Hepburn indicated good tropo conditions across the Tasman and Bass Strait over the weekend of 18th/19th of March. On Friday beforehand I got confirmation that ZL3TY would be operating from…
March 20, 2017
Two Dipoles for VK7RTC
On Wednesday 1st of March, a two dipole array was installed at VK7RTC. These were generously and professionally constructed by Dion VK7DB. The design picked is mainly an elliptical pattern. Dion…
March 1, 2017
Evaulating weak signal LNA performance – 144MHz
I conducted some recent tests with VK7MO who was running a low powered transmitter on WSPR (100mW). This gave me the opportunity, among other things to evaluate how well my Minikits…
January 18, 2017
Trying to predict Sporadic E MUF rising on 2m
On 12/01/17 a large number of stations started to be reported on 6 metres WSPR. At around 0913UTC I received a text message from a local amateur who was hearing…
January 12, 2017