link til info om div antenner.

Svar til #1:

Tak for linket - god infomation.

-

En vigtig ting der ikke fortælles om i artiklen er vigtigheden af transformatoren:

En del om "The-End-Fed-Half-Wave-Antenna (EFHW) (1:49 1:64)":


Bemærk side 25. Vigtig transformator information. 2 x FT-240-43 (ej "-61") (kan tåle 85W digital ca.= FM, AM) anbefalet, medmindre man kun kører QRP eller QRP Plus. Der skal stadig anvendes 100pF min. 3kV@100W på primærsiden, af hensyn til de højere bånd.

The End Fed Half Wave Antenna
November 14, 2018
Steve Dick, K1RF
https://web.archive.org/web/20190405175235/http: //gnarc.org/wp-content/uploads/The-End-F ed-Half-Wave-Antenna.pdf
Citat: "...
Common Errors in building homebrew EFHW UNUNs
...
[?? - hvad med teflonrør om lederen?:]
Putting insulating tape on toroids. (doesn’t need it and degrades performance by adding an air gap from wire to toroid. Ferrite toroids used in these UNUNs have very high resistivity.
...
Putting a choke balun right next to the UNUN. If used, it should be near the rig or the antenna has no counterpoise and won’t work
..."

-

Relaterede fund:

https://www.google.com/search?q=site%3Aham.brugt grej.dk%2Fforum.php%3Fmode%3Dthread+ende f%C3%B8det

https://www.google.com/search?q=site%3Aham.brugt grej.dk%2Fforum.php%3Fmode%3Dthread+EFHW

https://www.google.com/search?q=site%3Aham.brugt grej.dk%2Fforum.php%3Fmode%3Dthread+end- feed-wire

https://www.google.com/search?q=site%3Aham.brugt grej.dk%2Fforum.php%3Fmode%3Dthread+long -wire