[Antennas] Only dumb question is the one not asked
Dan Richardson
[email protected]
2002年3月30日 11:23:06 -0800
At 11:44 AM 3/30/2002 +0200, you wrote:
>----- Original Message -----
>From: Dan Richardson <[email protected]>
>To: <[email protected]>
>Sent: Saturday, March 30, 2002 4:30 AM
>Subject: Re: [Antennas] Only dumb question is the one not asked
>>>| At 05:26 PM 3/29/2002 -0800, you wrote:
>| >At 06:41 PM 2002年03月29日 -0600, [email protected] wrote:
>| >>RF current flowing on the outside of a coaxial feedline is
>| >>not a normal situation. It is caused by an abnormal
>| >>condition. You get that by connecting a balanced antenna
>| >>(dipole) to an unbalanced feed line (coax).
>|>|>| Huh? Then why is that RF chokes (baluns if you like) are used on
>monopoles?
>| The fact that an antenna is balanced or not does not remove the need for
>| stopping the unwanted current from flowing on the outer shield of coax.
>|>| Danny, K6MHE
>>A monopole (vertical) is also a balanced antenna: The radiator and radials
>form a balanced antenna.
>>A vertical antenna is simply a dipole with the center conductor element
>running vertical and the braid element running horizontal. Thus, the same
>balun theory for a dipole would apply to a vertical.
>>Deon ZR1DQ
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No so. Monopole meaning one and dipole meaning two. Monopoles are
considered unbalanced antennas re: ARRL Antenna book among others.
Danny, K6MHE