Re: [Elecraft] Random wire lengths for antennas

KXAT3 has trouble matching high impedance antennas. No problem matching anything using BL-1, BL-2, or any other 4:1 (or 9:1) balun although for odd impedances the balun may have substantial losses. But I prefer balun than antenna-tuner overheating. Probably all wire longer than 1/4 lambda

Re: [Elecraft] Random wire lengths for antennas

I believe that is why Jeff, kg7hdz, provided a link to an excel chart that has lengths of NO half waves in US ham bands. Saves a bunch of math. Making the Antenna " End fed non halfwave( in the ham bands )wire" or the EFNHWW. Whew 73 all Dean K2WW

Re: [Elecraft] Random wire lengths for antennas

January 29, 2017 1:02 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] Random wire lengths for antennas Not an alternate definition, but we have to recognize that just any old random length won't work. If the wire is near 1/2 wavelength on a band, the impedance at the end will be very high, and

Re: [Elecraft] Random wire lengths for antennas

On Behalf Of Ken > Talbott > Sent: Sunday, January 29, 2017 11:14 AM > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] Random wire lengths for antennas > > Indeed we do. And not just "random" but all flavors of end-fed antennae. I > get chastised

Re: [Elecraft] Random wire lengths for antennas

On Sun, Jan 29, 2017 at 1:01 PM, Lynn W. Taylor, WB6UUT < k...@coldrockshotbrooms.com> wrote: > If the wire is near 1/2 wavelength on a band, the impedance at the end > will be very high, and the tuner may not be able to match it. > Why is that? A quick heuristic to help understand. The

Re: [Elecraft] Random wire lengths for antennas

Not an alternate definition, but we have to recognize that just any old random length won't work. If the wire is near 1/2 wavelength on a band, the impedance at the end will be very high, and the tuner may not be able to match it. In truth, we're really talking about non-resonant antennas,

Re: [Elecraft] Random wire lengths for antennas

Balun Designs has a similar list of wire lengths hidden away as a link from the page for their 9:1 unun. http://www.balundesigns.com/content/Wire%20Lengths%20for%204%20and%209-1%20ununs.pdf They also make

Re: [Elecraft] Random wire lengths for antennas

m <mailto:n...@elecraft.com>> >Subject: Re: [Elecraft] Random wire lengths for antennas >Date: January 29, 2017 at 12:01:14 AM GMT-5 >To: "Emory Schley" <silverlo...@gmx.com <mailto:silverlo...@gmx.com>> >Cc: Elecraft <Elecraft@mailman.qth.net <mailto

Re: [Elecraft] Random wire lengths for antennas

Subject: Re: [Elecraft] Random wire lengths for antennas Indeed we do. And not just "random" but all flavors of end-fed antennae. I get chastised for calling my end-fed-tuned-multi-band-trapped-wire-an tenna (actually it is an LNR MTR) an EFHW. EFHW is simple to send. Should I sen

Re: [Elecraft] Random wire lengths for antennas

Hi Ken, How about EFRW (End Fed Random Wire). It shouldn't matter whether it is just a piece of wire or one with traps, loading coils, or any other lumped reactance. And it's also "simple to send". 73, Gus Hansen KB0YH On 1/29/2017 9:13 AM, Ken Talbott wrote: Indeed we do. And not just

Re: [Elecraft] Random wire lengths for antennas

recommend a succinct, unambiguous naming convention for all flavors of end fed wire antennae. Ken - ke4rg -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net ] On Behalf Of Tom McCulloch Sent: January 29, 2017 10:55 To: elecraft@mailman.qth.net Subject: Re: [Elecraft] R

Re: [Elecraft] Random wire lengths for antennas

I guess we need an alternate definition of "random" ;-) Tom wb2qdg __ 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

[Elecraft] Elecraft] Random wire lengths for antennas

There is an Excel spreadsheet giving 1/2 wavelengths to avoid, used by AH-4 remote autotuner users on the Yahoo group site. Here is another. http://www.w4atx.com/e107/download.php?view.1 73 Jim Allen W6OGC Sent from my iPad __

Re: [Elecraft] Random wire lengths for antennas

You can download some code I wrote for this at https://github.com/timseed/rnd_Wire.git For those people who just would like “some data” this is the output of the program listed above. I have not tried this data in EzNEC etc. The Spectrum I was

[Elecraft] Random wire lengths for antennas

Emory - before you cut any wire, go to the below url and peruse all of the info - unless you desire to operate have a 1/2 wavelength antenna (not a bad thing) and have a 1/2 wavelength tuner for the band of interest, mgo to the below url for recommended wire lengths that avoid 1/2 wave antenna

Re: [Elecraft] Random wire lengths for antennas

Generally something in excess of 50' for both wires will provide adequate on 80 meters and up. Wayne N6KR On Jan 28, 2017, at 5:38 PM, "Emory Schley" wrote: > My KX2 Owner's Manual, page 10, says "A length of about 25 feet for each > wire, matched to the KX2's output

Re: [Elecraft] Random wire lengths for antennas

Look here: http://www.hamuniverse.com/randomwireantennalengths.html Jeff -kg7hdz On Jan 28, 2017, at 7:16 PM, Matt Zilmer > wrote: What Rev do you see on the front cover? 73, matt W6NIA On 1/28/2017 5:38 PM, Emory Schley wrote: My KX2

Re: [Elecraft] Random wire lengths for antennas

What Rev do you see on the front cover? 73, matt W6NIA On 1/28/2017 5:38 PM, Emory Schley wrote: My KX2 Owner's Manual, page 10, says "A length of about 25 feet for each wire, matched to the KX2's output using an antenna tuner (see ATU, pg. 11) will typically provide good performance on

Re: [Elecraft] Random wire lengths for antennas

True enough, so I initially used about 25 feet (actually 29 feet) but it failed on 60 and 80 meters. I wanted to work all the covered bands. So my recommendation is to use 58, 29 feet to cover them all. Maybe something shorter will also work, but I will let others cut more wire first On

[Elecraft] Random wire lengths for antennas

My KX2 Owner's Manual, page 10, says "A length of about 25 feet for each wire, matched to the KX2's output using an antenna tuner (see ATU, pg. 11) will typically provide good performance on 40-10 m. (Without an ATU, resonant lengths are required for each band.) This antenna is ideal for