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Toon onderwerp - vanaf waar antenne lengte meten • nodo-domotica.nl

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vanaf waar antenne lengte meten

Hier alles over de hardware kant van de Nodo

vanaf waar antenne lengte meten

Berichtdoor h143 » 15 apr 2015, 21:27

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?
Arduino Mega 2560
Arduino Ethernet shield
Arduino uno
Nodo 1.0
h143
 
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Re: vanaf waar antenne lengte meten

Berichtdoor softwareregi » 15 apr 2015, 23:33

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)
Gr. John
softwareregi
 
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Re: vanaf waar antenne lengte meten

Berichtdoor PieterS » 16 apr 2015, 10:34

PieterS
 
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Re: vanaf waar antenne lengte meten

Berichtdoor softwareregi » 16 apr 2015, 10:51

Oeps....foutje
Moet inderdaad 50 Ohm zijn
Gr. John
softwareregi
 
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Re: vanaf waar antenne lengte meten

Berichtdoor h143 » 16 apr 2015, 20:49

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?
Arduino Mega 2560
Arduino Ethernet shield
Arduino uno
Nodo 1.0
h143
 
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Geregistreerd: 05 nov 2011, 10:08
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Re: vanaf waar antenne lengte meten

Berichtdoor rwijbenga » 16 apr 2015, 21:15

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.
rwijbenga
 
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