Peter King Back There has been some discussion on whether it is better to wind inductors as a torroid or as a solenoid on non magnetic material. Thoughts:-Magnetic lines of force add vectorially. They do not influence one another. Hence: The result of this is that the field near the centre of the solenoid is proportional to … Read more
AB INITIO PERFECTUS EST (or in plain English, this “From first principles” series is finished). This series of technical articles for the VARC Newsletter is now concluded. It has ranged over more than 3 decades and some 80 articles, although in the early days its publication in the VARC Newsletter was somewhat irregular. Its original … Read more
Back A dipole in free space, fed at its centre by a balanced feeder, can radiate all the RF power fed to it with no radiation from the feeder. Such a system is illustrated in figure 1. A dipole is a “resonant” aerial and its first “self resonance” is when its total length is approximately … Read more
Verulam Amateur Radio Club now has it’s remote station running from it’s site near Dunstable. This is running most HF bands and proving to be very successful. It is operating using the RemoteHams software, which is a free download from the Remote Hams website. Once downloaded you can search for VARC and access the radio. … Read more
Rhombic for 6m One thing I have fancied playing with for a long time is the Rhombic antenna. It has a very good directional gain and in principal is easy to construct. The problem is that on HF a Rhombic is extremely large. Even on 6m the antenna is pretty big! My idea for the … Read more
Back In “radio science”, ‘Q’ stands for Quality factor. In a simple resonant or tuned circuit, (and indeed also in a single inductor or capacitor), Q is conveniently summarised as “the component’s reactance divided by the component’s resistance”. The higher the Q, the lower the loss in the component’s resistance. (In most tuned circuits it … Read more
AB INITIO Back Puzzling facts As we approach the festive season of Christmas crackers, games and puzzles, it was thought once again that it would be appropriate to divert to something “Scientific” rather than strictly “Amateur Radio”. Everybody knows that the tides on the sea are due to the “pull of the moon”, but a … Read more
2018 was another step up in Verulam Club contesting with some very good results. The three main entries were made in the RSGB Club Championships, The Autumn Series and also our annual entry CQ WW CW. I know personally, and also from others I talk to that this year has seen a distinct improvement in … Read more
We are very proud to say that Verulam ARC has taken the first place position in General Section of this years 1.8 MHz AFS Club Calls Contest. Well done to all those who took part, a good time was had by all! Coming up we have three AFS contests in January in which we encourage … Read more
Contesting Pages Contest Home Page On Going Contests Cabin and Contest Diary CQ WW CW Contest The final results have been released for the 2017 Club Championship competitions. We have managed to hold on to our seventh position in the ‘General Club’ category. This is out of a total of 45 entrants in that category, … Read more
Contesting Pages Contesting Home On Going Contests Cabin and Contest Diary We are now in the planning stages for this years CQ WW CW contest. This is a 48 hour Morse contest which we run from our ‘cabin’ site. We will be running four stations for the whole of the 48 hour session, so there … Read more
Visit Contests Page Introduction The Club Championship is an RSGB run contest that operates for six months from February until July, with three contests each month covering SSB (voice), CW (morse) and Data modes. This is a contest where multiple operators can submit their entry on behalf of the club, and all their scores are … Read more
