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. > > mjis...@btinternet.com > > > Sent from Samsung Mobile > > > -------- Original message -------- > From: Fred Moore > Date:29/12/2016 13:04 (GMT+00:00) > To: elecraft@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. > > ______________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:Elecraft@mailman.qth.net > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > > Message delivered to f...@fmeco.com > > > > -- > Fred Moore > email: f...@fmeco.com > f...@safes.com > phone: 321-217-8699 > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to mjis...@btinternet.com > > -- > This message has been scanned for viruses and > dangerous content by *MailScanner* <http://www.mailscanner.info/>, and is > believed to be clean. -- Fred Moore email: f...@fmeco.com f...@safes.com phone: 321-217-8699 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
