LF: Calculating loop-antennas

Andre' Kesteloot akestelo@bellatlantic.net
Mon, 02 Aug 1999 14:08:55 -0400

bernd grupe wrote:

> Hello all,
> when experimenting with different loop-antennas it would be very helpful to have
> a special tool for calculating all the equations in terms of L and C and
> efficiency (esp. the radiation resistance).So I got the idea to program a
> specific "calculator" for all the work and just put a very first version on my
> web-site. It runs with all the popular browsers. Online as well as offline when
> downloading the Java-File to your PC.The URL is:
> http://home.t-online.de/home/Bernd.Grupe/homepage.htm
> My qth-locator is JN49JV and its 40 km down of Frankfurt/Main.Due to the near
> big radio stations - DLF 153kHz, DCF 77 and intermodulation by 129 kHz(GPS) etc.
> - you can believe me, that it's hard to get an audible signal in NCW. Since
> April i tried to connect dk8kw(Geri) on lf. But it was just the one-turn
> loop-ant. which i have built at least, to get Geri at friday last weekend with
> quite a high O quality in scw-mode. This good performance of loop-ant. brought
> me to write this mail to all of You, who suffered from similar bad conditions.
> Try a loop and look for gd dx.
> 73 bernd, DF8ZR
> TX-ant.: marconi 10 m high; coil 2.3 mH
> RX-ant.: selective loop, 2 m diam
> pw: 20 watts homemade
> rx: PCR1000 ICOM with selective preamps