Re: [softrock40] Re: Internal Sound Card Problems?
Many guys seem to shy away from magnetic loops. I don't why as they are easy to make, they don't need height and they work splendidly.On 26/11/12 14:21, Tom Clifton wrote:> On 25 Nov 2012, at 18:54, Ulf Holt Gmail <ulf.holt@gmail. com> wrote:
> > I think I will go for a magnetic loop, and got a description where I need 32" of 1" aluminum tube, bent to form a circle, and a coax inside. I will be able to get a coax, but here in Pattaya I have no ideas where to get the aluminium,
A bicycle wheel rim is also suitable. While aluminum is preferable, steel will work as well. Take out the spokes and away you go.
Repeating myself, my first was made of 3/8" diameter soft copper tuned with a variable capacitor that was only capable of 7W before it would arc over and placed indoors on the upstairs landing I worked all over Europe with it on 40m. Within less than an hour this loop was built and working. I used the small coupling loop with this one.
My present loop is 8' diameter octal with 22mm copper pipe and 45 degree copper elbows tuned with a vacuum capacitor that takes the full 100W.
The one being rebuilt after it crashed in 60+ mph winds is a 13' diameter of 28mm copper tube constructed with 45 degree elbows as the current one. With this one and 100W all my 80m contacts Stateside have been made with good reports both ways.
The aa5tb loop page also has pointers to many more magnetic loop information sources.
BTW I have found gamma matching for me has been easier than trying to adjust the small coupling loop.
You can't beat magnetic loops for ease of construction and operating.
73 ... Sid.
-- Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support Senior Staff Specialist, Cricket Coach Microsoft Windows Free Zone - Linux used for all Computing Tasks