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nodo-domotica.nl • Toon onderwerp - vanaf waar antenne lengte meten - Afdrukweergave
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vanaf waar antenne lengte meten
http://www.nodo-domotica.nl/forum/viewtopic.php?f=4&t=2463		 Pagina 1 van 1
Auteur:  h143 [ 15 apr 2015, 21:27 ]
Titel:  vanaf waar antenne lengte meten
ik heb zelf een nodo shield gemaakt met alleen een 433 mhz zender en ontvanger.
nu heb ik hier op een smd connector gesoldeerd en deze op de zender aangesloten.
het draadje tussen de zender en connector is 2cm.
moet ik deze nu bij de totale lengte van de antenne optellen?
en kan dit met een normaal flexibel draadje met massieve kern of heb ik hier een coax kabel voor nodig?
Auteur:  softwareregi [ 15 apr 2015, 23:33 ]
Titel:  Re: vanaf waar antenne lengte meten
Die 2 cm hoef je er niet bij op te tellen, maar aan dit "draadje" worden wel eisen gesteld. Het beste is om hiervoor 75 Ohm coax kabel te gebruiken (dus niet gewone coax voor b.v. tv en radio)
Auteur:  PieterS [ 16 apr 2015, 10:34 ]
Titel:  Re: vanaf waar antenne lengte meten
Auteur:  softwareregi [ 16 apr 2015, 10:51 ]
Titel:  Re: vanaf waar antenne lengte meten
Oeps....foutje
Moet inderdaad 50 Ohm zijn
Auteur:  h143 [ 16 apr 2015, 20:49 ]
Titel:  Re: vanaf waar antenne lengte meten
Bedankt voor de reacties ik zal binnenkort dan even kijken of de locale electronica boer een paar cm verkoopt.
Moet ik alleen de kern van de kabel verbinden of de mantel ook aan de gnd oid?
Auteur:  rwijbenga [ 16 apr 2015, 21:15 ]
Titel:  Re: vanaf waar antenne lengte meten
Beste is ook de mantel uiteraard op de massa aan te sluiten, je kan ook kijken of je een stukje coax kabel kan vinden en een oude router of notebook. Daar zitten vaak ook korte stukjes in en nog dun ook.
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