Re: [Elecraft] Slightly OT: non-resonant wires

I think the only important measurement is that it avoids being near a half wavelength on any bands. Are there really "magic" lengths to be used with 9:1 xfmr into a tuner? I'm skeptical. 73, Barry N1EU On Tue, Feb 9, 2016 at 1:50 PM, Lynn W. Taylor, WB6UUT < k...@coldrockshotbrooms.com> wrote:

Re: [Elecraft] Slightly OT: non-resonant wires

I don't believe there are magic lengths. There are however lengths that are decidely non-magical, and if you want something that works on 40, 30, 20, 17, 15, 12 and 10, there are many lengths that are non-magical. That's why I did not ask "what is a good length?" There is a pretty good

Re: [Elecraft] Slightly OT: non-resonant wires

I use a BOSCH laser tape obtained from the local hardware supply store. It measures to 250 ft, +/- 1/16". The only challenge is to estimate the wire sag in measuring a long length of wire. The laser is always measuring straight line. For shorter lengths, I stretch the wire tight on the

[Elecraft] Slightly OT: non-resonant wires

Only a bit off-topic, since I have a KX3 w/tuner and a 9:1 balun to go with it. I know how to trim a resonant antenna to the correct final length. I also understand why truly "random" wires don't necessarily work. The recent post about shipboard operations near Antarctica said they're using

Re: [Elecraft] Slightly OT: non-resonant wires

Start with a sailboat sitting in salt water with the electrical system and masts bonded and tied to suitable grounding plates on the hull. This is all normal for most shipboard installations. A random length of wire can be matched to effectively transfer RF from the transmitter. Precise

Re: [Elecraft] Slightly OT: non-resonant wires

A 53ft end-fed wire has a radiation pattern that varies all over the map as you go up in frequency above 10MHz. For 40-10M, I much prefer a 44ft center-fed doublet which has a broadside pattern on all bands. Barry N1EU On Tue, Feb 9, 2016 at 2:38 PM, Lynn W. Taylor, WB6UUT <

Re: [Elecraft] Slightly OT: non-resonant wires

Which works great if the antenna is supposed to be resonant on one or more bands. On 2/9/2016 12:22 PM, Bob McGraw K4TAX wrote: In general hams will construct the antenna and then trim the length {add or subtract length} to get the SWR value to 1:1 or such.

Re: [Elecraft] Slightly OT: non-resonant wires

First you get a 53’ wire, then cut the string to the same length. :-) When I was cutting wires for SOTA use, I attached one end to something that wouldn’t move, hooked the end of my 25’ tape measure to the same spot, then stretched them both out. I marked the 25’ point on the wire, then

Re: [Elecraft] Slightly OT: non-resonant wires

http://www.engineeringtoolbox.com/cable-loads-d_1816.html A wire supported at the ends and loaded uniformly only by its own weight will form a catenary, and mid-span sag is a function of mid-span tension. Zero sag = infinite tension. Unfortunately, center-fed dipoles are not uniformly

Re: [Elecraft] Slightly OT: non-resonant wires

I asked the best way to measure a piece of wire 53' long. On 2/9/2016 11:58 AM, Barry N1EU wrote: A 53ft end-fed wire has a radiation pattern that varies all over the map as you go up in frequency above 10MHz. __ Elecraft mailing

Re: [Elecraft] Slightly OT: non-resonant wires

Lynn, It depends on what kind of measuring sticks you have. If you have a 100 foot tape measure, just pull out 53 feet and match the wire to that length - that is the way I do it. If you only have a 50 foot tape, measure 25feet, 6 inches and double it back on itself. If you have only a 25

Re: [Elecraft] Slightly OT: non-resonant wires

I shouldn't have said anything about antennas, or how I was feeding it. How would you measure a string 53 feet long? On 2/9/2016 11:56 AM, Heinz Bärtschi wrote: The matching range of the KX3ATU is specified as "typ. 20:1". __

[Elecraft] Slightly OT: non-resonant wires

There is/was quite a long discussion and lots of experimentation with 9:1 unun and random wire lengths on the pQRP group in the last month or so. Check it out. PJH, N7PXY __ Elecraft mailing list Home:

Re: [Elecraft] Slightly OT: non-resonant wires

Well, a 100 foot tape isn't too expensive. Companies dealing in survey gear, such as Inner Mountain Outfitters carry ones graduated in feet and 1/10s on one side plus meters on the other side. Perfect for Antenna work (and cave

Re: [Elecraft] Slightly OT: non-resonant wires

, 2016 2:38 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] Slightly OT: non-resonant wires I don't believe there are magic lengths. There are however lengths that are decidely non-magical, and if you want something that works on 40, 30, 20, 17, 15, 12 and 10, there are many lengths

Re: [Elecraft] Slightly OT: non-resonant wires

The matching range of the KX3ATU is specified as "typ. 20:1". The ATU has a switchable L/C network, so I understand this as 10:1 up and down, or in other words the KXAT3 matches loads in the range of 5 to 500 ohm? 73, Heinz HB9BCB > Am 09.02.2016 um 20:06 schrieb Barry N1EU

Re: [Elecraft] Slightly OT: non-resonant wires

EU Sent: Tuesday, February 9, 2016 11:06 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] Slightly OT: non-resonant wires I think the only important measurement is that it avoids being near a half wavelength on any bands. Are there really "magic" lengths to be used with 9