Navtex-Fan wrote:
Hi group,

I've been using a Tee-antenna for Navtex reception on 518 KHz for about
6 months now. Details are he
http://users.pandora.be/dirk.claessens2/NAVTEX/Tee-antenna.jpg

I'm very pleased with the results, the thing just works. Almost no local
QRM pickup, low noise. I was able to decode really weak Navtex stations
in Florida, Puerto Rico, Bahrein. ( I'm living near Antwerp, Belgium).

But is this a really optimal antenna setup - given the obvious real
estate limitations of my back garden?

When I feed the antenna data into 4NEC2, the following data result:

Z = 241-j1812 Gain = -28.6 dB SWR = 278
I'm assuming that the mismatch is "solved" by the use of the 4:1 UnUn..

If I model a base loading coil of +/- 550 microH , the following results:
Z = 165-j14 Gain = -26.9 dB SWR = 3.3

Question 1: Is installing a base loading coil worth the trouble for
receive-only purposes?

Question 2: Should I still use the balun?


Thanks for any advice.

Cheers - Dirk



Whoa ...

Sorry about that, had a virus and is was showing "all sorts" of strange
stuff till I ran the scanner and reloaded this ng thread.

My mistake, I apologize to the MAX :-(

I am throughly embarrassed ...

Warm regards,
JS