ARI Sanremo Home Page Home Page Nominativo di Sezione ARI Sanremo
Home Main Menu Sezione ARI-RE Award Liguria EME Diploma Sanremo Search Members Downloads Forums Guestbook Login

Toggle Content Trova nel sito


Toggle Content .:Translate Language
Please select to change language

Klicken Sie auf Sprache ändern

Sélectionner pour changer la langue

Haga clic para cambiar el idioma
Autori › Wire antenna with coaxial cable traps
Wire antenna with coaxial cable traps

Wire antenna with coaxial cable traps

by Attilio I1BAY - I QRP Club 309


This antenna matches the needs to reduce as much as possible dimensions and weight trying to maintain a high efficiency across all bands.
I believe the sketch is self explanatory.
The antenna has been several times used during SOTA activations with positive electrical results, little bit less as portable due to his dimension and for the difficulty to find two points to hang it on the top of the mountains.
However it remains a good solution for a fix operation or for a field day as, in the last case, it can operate at a lower altitude where we can find trees and, not being obliged to carry the whole equipment on the shoulders, we can use some poles.
I need to write some more words to explain traps construction.
The balun is 1/1: toroidal core for HF, colour light viola; size: external diameter 37 mm., thick 17 mm. (able to handle hundred W ; compact coax with well insulated center conductor stranded (or a small size coaxial cable 52 Ohm ).
Starting from the center of the antenna, wind the cable well tied on a half part of the toroidal core with 9 turns, go back to the begin (crossing the internal part of the toroidal core ) in a diagonal way and wind further 9 turns in the opposite direction to the first nine, to reach than the SO239 connector.
Let see now how to build a trap... the wire which is coming from the centre of the antenna has to be soldered to the shield at the beginning of the coax winding the trap, the "hot" wire (center) of the rolling has to be soldered on the shield on the out part of the rolling of the trap, the "hot" wire (center) has to be soldered on the cable going on towards further traps.
All to be placed on a Plexiglas insulator, than fix using an insulant glue.
Number of turns for each traps and diameter according to the sketch.
Max power rated is depending from the toroidal core and from the size of trap coax, the one described can support more than 100 W.
I suggest to use high quality coax for traps.
Last year I have used this antenna, and few Watt, during SOTA activations making hundred of QSOs worldwide, enjoy your self!

Please find here below the drawing: Filare 

Italian version



(25188 reads) Printer Friendly Page

[ Return to I1BAY ]




Nominativo di Sezione
Sezione A.R.I. Sanremo - 18.02 codice ASC che per la Sezione è G08

La Sede si trova in corso Mazzini n° 1, a fianco del Campo Sportivo, in Sanremo. La Sezione è aperta tutti i martedì, non festivi, dalle ore 21 alle ore 23 circa.

Indirizzo Postale:

ASSOCIAZIONE RADIOAMATORI ITALIANI
SEDE di SANREMO
CASELLA POSTALE 114
18038 SANREMO IM


Scrivi al Segretario
ASSOCIAZIONE RADIOAMATORI ITALIANI P.IVA & C.F. 90029580082
Indirizzo di posta elettronica certificata
presidenza@pec.arisanremo.it

Webmaster IZ1OQB PINO

Contatto per il Webmaster
Regolamento del Sito | Note Legali/Disclaimer | Come trovarci


Best viewed 1024x768 +

Questo sito appartiene alla Sezione ARI di Sanremo (IM) e non rappresenta una testata giornalistica in quanto viene aggiornato senza alcuna periodicità.
Non può pertanto considerarsi prodotto editoriale ai sensi della legge n. 62 del 07.03.2001.
I loghi, i marchi e gli script usati in questo sito appartengono ai rispettivi proprietari e a CPG-Nuke Team.
Questo sito utilizza la versione 9.2.1 di Dragonfly CPG-Nuke.
Theme by i1yst
Tutti i testi, le foto e i disegni tecnici sono esclusiva proprietà di © 2002-2013 arisanremo.it
Vietata la riproduzione e la copia, anche parziale, senza la previa autorizzazione di arisanremo.it

All content are protected by the copyright law and may not be copied without the express permission and the active reference to a source!
Web stats

Interactive software released under GNU GPL, Code Credits, Privacy Policy



placeholder Support GoPHP5.org   Dragonfly   XHTML valid!   CSS valid!   Level Double-A Conformance icon, W3C-WAI Web Content Accessibility Guidelines 1.0   RSS valid!   Robots valid!   PHP   PhpMyAdmin   MySql   Get Adobe Reader   Unicode   Add to Google placeholder