[Elecraft] Small QRP antenna

[Fred Moore]

With an end fed 1/4 wave you only need a counterpoise that is about .05
wave length.  it can be the coax or another counterpoise.  Although a
counterpoise has some effect on radiation pattern of a quarter wave
radiator, it is minimal.   You won't see much improvement in performance
by going above .05 wave length..  it's not worth the trouble to increase
the counterpoise length..   Fred


On 12/29/16 9:01 AM, mjisted wrote:
> Looking at your text message on the elecraft board. About a half wave
> length ...here is a question for you. I'm going to put up a half
> wavelength of wire for the 5 mhz band. ..hyendfed can I use a quarter
> wave length of counter point as a radiator ground plane. .. 
> The. ..G0MVP. 
>
> mjisted at btinternet.com
>
>
> Sent from Samsung Mobile
>
>
> -------- Original message --------
> From: Fred Moore
> Date:29/12/2016 13:04 (GMT+00:00)
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] Small QRP antenna
>
> Don,
>
> Thank you very much, for pointing out a very common issue that gets
> mixed up into discussions.  Your point is so valid the random wire
> always seems to get mixed into the 1/2 wave discussion for some
> reason..  and should never be mixed together.  you are absolutely
> correct..   thanks again regards..  Fred
>
>
> On 12/29/16 12:33 AM, Don Wilhelm wrote:
> > Scott,
> >
> > If the radiator is not a half wave long, it is not a "half wave".
> > Yes, a random length wire may work, but please do not call a random
> > length a half wave - the length of a half wave is quite specific.
> > Similarly, a quarter wavelength is a specific length at a particular
> > frequency.
> >
> > 73,
> > Don W3FPR
> >
> > On 12/28/2016 11:20 PM, K9MA wrote:
> >> The counterpoise for an end fed half wave (or multiple) really doesn't
> >> have to be anywhere near a quarter wave long.
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> -- 
> Fred Moore
> email: fred at fmeco.com
>        fred at safes.com
> phone:  321-217-8699
>
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-- 
Fred Moore
email: fred at fmeco.com
       fred at safes.com
phone:  321-217-8699