[AMRadio] 50 ohms simple question

Alan Beck abeck at xplornet.com
Thu Apr 5 16:33:01 EDT 2007


Need to read up on dipole basics.


-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of Geoff/W5OMR
Sent: April-05-07 3:53 PM
To: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] 50 ohms simple question

Alan Beck wrote:
> Basic question
> Why is it that my radios are 50 ohms and the impedance at the feed point
> the antenna (pure dipole) is 70 ohms.
> Am I mistooken

No, yer not mistaken.... but, if you want to lower the input impedance 
to your dipole, bring the legs down to around 40 degrees, and you'll 
drop the input impedance to the antenna down around 20 ohms.


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