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Category Archives: Equipment

Jun 04

Juma PA1000 harmonic measurements

Posted on June 4, 2016 by G7VJR
Juma PA1000 with KX3

Update (15 June 2016): the team at Juma have posted their professional measurements here: http://www.jumaradio.com/juma-pa1000/JUMA-PA1000-performance.html Travelling light with a 500W+ station The Juma PA1000 is a remarkably light 1000W solid state amplifier, and offers high levels of gain so that … Continue reading →

Posted in Equipment, Expeditions, Opinion | Tagged Juma PA1000
Feb 11

Radio Arcala – the world’s largest 160m antenna at OH8X

Posted on February 11, 2013 by G7VJR

Far north of Helsinki, close to the Russian border and 40 miles from the nearest town, you need to take an unmarked turn-off down a snowy track to reach OH8X. As you crunch through the snow in twilight at -20C, … Continue reading →

Posted in Contesting, Equipment, Info, News | Tagged OH8X
Dec 02

5 Things I Love (and Hate) about Windows Phone 8

Posted on December 2, 2012 by G7VJR

Not long ago, after many years using a Apple iPhone I decided to give Windows Phone 8 a go, and bought a Nokia Lumia 920. There are a lot of attractive features in the Nokia (especially the camera) and I … Continue reading →

Posted in Equipment | Tagged windows phone 8
Jul 25

Palstar HF-Auto

Posted on July 25, 2012 by G7VJR
Palstar HF Auto

I few months ago I bought a Palstar HF Auto, which is a stepper motor driven ATU with high power handling. Although I don’t run a big amp, I do tune my Tokyo HyPower into some strange loads, and I … Continue reading →

Posted in Equipment | Tagged hf auto, palstar, palstar tuner
Jun 15

Wellbrook loop on 160m

Posted on June 15, 2012 by G7VJR

I live in the centre of a reasonably busy village, near a sub-station for the electricity board. My main antenna for 160m is an inverted ‘L’ with a fair earth system, but it’s a noisy receiving antenna. With little prospect … Continue reading →

Posted in Equipment | Tagged 160m, wellbrook loop
Nov 24

Electret microphone element on the Elecraft K3

Posted on November 24, 2011 by G7VJR
Elecraft K3

I recently bought a new set of headphones, to replace my old Heil headset. I met Dave Bottom WI6R of Arlan Communications at Visalia 2011, and he introduced me to his fantastic headsets, a by-product of his motorsport business and … Continue reading →

Posted in Equipment | Tagged elecraft, elecret, k3, microphone bias, rs60 radiosport headset
Mar 06

160m Vacuum Variable Capacitor project

Posted on March 6, 2009 by G7VJR
Vacuum Variable Capacitor

While operating on top band at ZD8UW I had quite a few problems getting the inverted “L” to match at 50 ohms. Even after adjusting the element length this is virtually impossible due to the nature of the antenna. To … Continue reading →

Posted in Equipment | Tagged 160m, construction, projects
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