Posted: Wed Dec 02, 2009 10:10 am Post subject: DIY VHF Comm antenna, Reply with quote ... UHF male connector at the end of your feedline. Cut the overall length of the ... < show me where I'm wrong. Dateiformat:

The Feed line is the length of coaxial ("coax") cable from the radio to the ... First thing I did was try to remove the stock oil feed line using an 11mm line wrench on the ... be and see how much hose I really needed... and marked the length on the hose with a marker. ... "Oil tree" (camera focused on wrong spot): 10 Einträge - 8 Autoren - Letzter Eintrag: 23. Juni 2008located near the antenna's feedpoint to prevent coax feedline re- ... balun at all, and that only dipoles used them. Am I wrong about this?). .... points along its length.

4 Jul 2009 ... Here I have discussed at some length the very basics of antennas. ... people asking are beginners who are afraid of making the wrong choice. ... a choke balun is designed to "divorce" your antenna from the feed line. Dateiformat: You can make an antenna every bit as good as theirs, and even better in many .... This would not be all bad except that this radiation is in the wrong direction ... 20 Feb 2000 ... Whatever antenna you chose, if it is fed with coaxial cable you should use a choke balun. Dateiformat:

1 Jan 2003 ... Slide91 :

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They are wrong. In fact most passive readers are accurate for what they ... To convince you, change the length of your antenna or remove the balun if you use one. .... 11 Nov 2009 ... When a Π/L coupler feeds an asymmetrical random-length antenna, ... The 50Ω coaxial feedline and power/control cable are brought back to the transceiver .... The length of feedline remains an issue. With 80 feet of feed-line (rec. by Radio ... First off - The Carolina Windom 40 Plus is a great antenna and light years ... 14 Einträge - 5 AutorenThen trim your feedline length so that you have a perfect SWR of 1:1 into ....

A quick analysis of a Windom will show that it's the same length as a half wave dipole on ... Wrong. I do not mean to imply that a resonant antenna length and a low feedline SWR ... 1 Jul 2009 ... It was used for this antenna, and one four metre length is required. ... A half wave balun is used to connect the RG58 feed line. ... mistake and have rushed off in the wrong direction and that is the end of their hunt. 11 Mar 2007 ... Why is it so important to have a fully steerable antenna, you might ask? ..... I initially had no idea that all four of mine came to me the wrong length. ... If you have some extreme VSWR between the feedline and antenna, lets say from ... 7 Einträge - 1 Autor - Letzter Eintrag: 25. Nov.

As far as avoiding quarter wave multiples in your feedline length, ... a beam or other directional antenna, this radiation most likely will be in the wrong ... Dateiformat: Dateiformat:

By "typical"-- and I may be using the wrong word here-- I mean the ham on an average city lot, ... 1.8 dB less antenna feedline loss. c. 1.8 dB more power. ... and so a benefit would be seen at a line length less that 700 feet. Less than a teaspoon of water in the wrong place can damage your system.Water migration into coaxial connections in the base station and antenna can ...

Ordinary RG-8/U coax makes a highly satisfactory feed-line. ... the indications are that something is wrong with the outer resonant circuit. ... August 15 , 2004 - Replaced the six 8-3/4" RG8 jumpers on the duplexer with same length Andrew FSJ1-50A Superflex Heliax. ... March 16, 2003 - New dual band Diamond X510 antenna installed. ... Very high SWR has been found between the duplexer and the feedline. ... We had no idea what was wrong at the time. von AF Stahler - 1980 - Zitiert durch: All cabling and connections were checked as was the TV antenna but no faults were found. ... length of 402mm from the tip of the connector to the end of the stub. ... Of course there was nothing wrong and once the index fell back to lower ... WRONG ... I was forced to install a X-Brace. The weight of the X-Brace, ... Ultimately, both feedlines should be run to the rear of the antenna and be routed ... Shorting routing / length for phasing lines.

18 Einträge - 7 Autoren - Letzter Eintrag: 14. Aug. 2007I guess I read that wrong. Lots of hams have built length based ... Just an interesting application of antenna feedline theory at work! I first built this antenna about 1980 and it did an excellent job. I wanted to get it higher so I used 1&1/4 wave length on the coax to each element. ... The switch does not ground either feed line, given RF is fed to both elements. ... not well known so those network calculations would likely be wrong anyway.

The antenna is the most important part of an ATV system. ... The loop yagi has very good gain, is forgiving in construction details, and allows boom length flexibility. ... (One less thing to buy and have go wrong!) ... Connect the radio to the feedline port with any length of 50 ohm coaxial cable. ... 6 Jun 2006 ... The SWR of the antenna, without feedline, can be measured by placing the SWR ... coaxial cable reaction (bad quality, wrong length, etc. I prefer to make an approximate length measurement, and then calibrate the ... The feedline between my 10m monoband HexBeam test antenna and my Palstar ZM30 ... 12 Dec 2008 ... I calculated the expected length of a 1/4 wavelength coax line, ... Yes, the connection of the feedline to the antenna is not very sturdy - it's just ... box (I managed to buy the wrong size nuts for the bolts I bought).

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The antenna is the wrong length, or there may be an open or shorted connection somewhere in the feed line. What commonly available antenna feed line can be buried directly in the ground for .... If you get a test case that you suspect is wrong or simply find hard to believe, ..... But just be sure to cut the feedlines to the exact length required. 19 May 2008 ... WRONG, not the best decision. .... Antenna Feed-line and Cable Tips: .... The number of bands covered is determined by the length. 29 Feb 2004 ... You can measure the line length with your antenna analyzer if you ... that there is nothing seriously wrong with the cable and connectors.

I do agree that length of feedline relates to frequency - and that kind of makes ... The importance of using a low-loss antenna feedline is often neglected during radio installation. 10 Einträge - 4 Autoren - Letzter Eintrag: 24. Juni 2008A direct quote from DX Engineering's Website: 11 Einträge - 7 Autoren - Letzter Eintrag: 20. Apr. 2009greater than 1), and the feedline is cut at a length that ... from others, they are often wrong.

chart of favorable lengths of feedline. Is it wrong? My 2000 ARRL Handbook describes ... (rec.radio.amateur.antenna); Re:

It all depends on the type of antenna and feed line you're using. QST Article in pdf format ... 15 Feb 2009 ... After putting the tape around, the wires and feedline could be ... When I went outside, I realised I must have been wrong calculating the length of the ...

13 Jun 2009 ... Often wrong conclusion are SWR 1:1 if antenna have 50 ohm but ...

35 Einträge - 11 Autoren - Letzter Eintrag: 23. Sept. 2006The Length and ID is very important in keeping the oil pressure of the ..... 4 Einträge - Letzter Eintrag: 12. Mai 1999Make your antenna readings as close to the antenna feed point as possible. Dateiformat: 15 Aug 2009 ... At only 58 inches in total length, you can stick this thing (invisibly) just ... Then I'll mark the spot on the antenna where the feedline should be ... noticed I screwed the darn thing onto the wrong end of the antenna!

71 Einträge - 54 Autoren - Letzter Eintrag: 21. Jan.Everything about length of antenna - length of antenna, ... calculate the width of the 50 ohm feed line .. but for proper matching antenna input ..... mhz in hfss . but this anten operates wrong.could do anybody help me?

Hang the center of the antenna from a tree limb, or use a support as pictured. .... Many want to know about feedline lengths. Is there any 'ideal' length? I was feeding a short, limited-space antenna with coaxial cable.Everything seemed to be okay, ... (Cable loss decreases as feed-line length and frequency decrease. ... Wrong again. The tuner quickly brought the SWR down to 1:1. 15 Einträge - 4 Autoren - Letzter Eintrag: 17. Nov. 2008I'm sure of the length and replace the ones on the antenna. ... the symmetrical feedline that feeds the righthand dipole leg, and this .... knowledge-base of " how things can go wrong" or "tying symptoms to solutions.

The length of the gamma tube for my construction method is 2-1/2" long. The wire going into the tube is a piece of coax from a car radio antenna. 14 Oct 2006 ... Putting some clamp-on RF cable chokes on the feedline reduced the noise a bit. ... This wire length now allows me to use a single loop of wire. ... I was wrong . Wire diameters for 0. An elevated monopole may be tuned by either trimming the length of the radiator .... [Elecraft] Feedline radiation (WAS: The risk of my being wrong on this prediction is that you will need to measure the .... Care must be exercised in the selection of feedline length however, ... LENGTH- To find out how long the antenna should be all you have to do is fill ...

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