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Werking elektrische antenne : Techniek

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Werking elektrische antenne

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Werking elektrische antenne

Berichtdoor Timmk3 » 31 aug 2015, 17:42

Ik heb een elektrische antenne (origineel Hirschmann) met motor uit een sloper gehaald.
De bekabeling is afgeknipt. Wanneer ik deze wil uittesten (door een + en - er op te zetten) hoor ik de motor wel draaien (in beide richtingen), maar de antenne doet zelf niks.
In de afgeknipte kabelboom zitten er 3 kabels (bruin, rood en blauw), 1 ervan is de massa, de andere + draait motor in 1 richting en andere + erbij draait motor in andere richting. Ook de antenne zelf heeft nog een massa, maar verder zie ik geen bekabeling (buiten de stekker voor de ontvangst, deze is niet aangesloten).
Moet deze stekker inzitten om te kunnen testen en/of ontbreek ik nog iets van bekabeling?
Of duidt dit gewoon op een defecte antenne (uitschuifsysteem)?
Timmk3
 


Re: Werking elektrische antenne

Berichtdoor Gerko » 31 aug 2015, 18:14

De blauwe hoort signaal te krijgen als je radio aan staat. 12v bij radio aan 0v bij radio uit. Om de antenne te testen zet je 12v op rood massa op zwart en dan ook 12v op blauw. Dan moet ie helemaal uitschuiven. Als je de voeding op blauw dan weghaalt moet ie weer helemaal inschuiven
Ik ben niks nieuwsgierig, maar ik wil gewoon alles weten!
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Re: Werking elektrische antenne

Berichtdoor Timmk3 » 31 aug 2015, 20:00

Dank je wel, dit werkt!

Meenemer in bovenste tandwiel was afgebroken waardoor ik motor wel hoorde draaien, maar het was enkel het bovenste tandwiel dat draaide. Nu is het verbonden met onderste tandwiel en werkt het naar behoren :grin:

Ik neem aan dat de aarding op de antennehals ook van nut is?
Timmk3
 


Re: Werking elektrische antenne

Berichtdoor Leeflang » 31 aug 2015, 20:30

Die schermt het antennesignaal af tegen storingen van buitenaf, aan de kant van de radio wordt die door de antennestekker verbonden met de behuizing van de radio, bij de antenne wordt die aan het chassis geschroefd.
Dat is niet strikt noodzakelijk voor de werking, maar wel beter voor storingsonderdrukking.
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