[Elecraft] Small QRP antenna

[Fred Moore]

oops here I am typing 1/4 when the whole time I was thinking 1/2.. 
thanks for correcting me.. Fred


On 12/29/16 11:09 AM, K9MA wrote:
> I think Fred meant an end fed 1/2 wave, NOT 1/4 wave. 
>
> 73, 
>
> Scott K9MA
>
> ----------
>
> Scott Ellington
>
>  --- via iPad
>
>> On Dec 29, 2016, at 9:30 AM, Fred Moore <fred at fmeco.com> wrote:
>>
>> 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
>>
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-- 
Fred Moore
email: fred at fmeco.com
       fred at safes.com
phone:  321-217-8699