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## [TowerTalk] Fw: 2 el yagi question

 To: "Tower and HF antenna construction topics." [TowerTalk] Fw: 2 el yagi question "Ron W8RJL" Thu, 17 May 2012 20:52:33 -0400 mailto:towertalk@contesting.com>
 ```Subject: Re: [TowerTalk] 2 el yagi question Tom If you put a director in front of a dipole you have constructed a two element Yagi antenna. Assuming you use the proper spacing (0.1 to 0.15 wavelengths) between the dipole (now called the driven element) and the director (which is about 5% shorter than the dipole) and you match the antenna to the coax (gamma match maybe) the gain will be about 5 dB greater than a dipole. A signal off the back of the antenna would be down about 10 dB compared to a dipole. Remember that an S Unit is equal to 6 dB. If you are interested in Yagi antennas there are many good sources but a good older book is the "Beam Antenna Handbook" written by William I. Orr, W6SAI (now SK) and Stuart D. Cowan, W2LX. You can also read up on Yagi antennas and many others in the ARRL Antenna Handbook. You might also want to search on Google for "Wire Yagi Antennas". If you are thnking about a Field Day antenna you might look at this link.[http://www.qsl.net/ve3rgw/field98/beam.html] 73 and good luck. Ron W8RJL > ----- Original Message ----- > From: "Tom Osborne" > To: "Towertalk" > Sent: Thursday, May 17, 2012 7:42 PM > Subject: [TowerTalk] 2 el yagi question > > >> OK, this may be a dumb question, but I've been wondering. >> >> Say I put up a dipole going E and W, and there's an S-9 signal on the >> dipole coming from the South. >> >> If I put a director in front of the dipole, will the signal still be S-9 >> on the dipole? >> >> Just wonderin'. 73 >> Tom W7WHY >> >> >> >> _______________________________________________ >> >> >> >> _______________________________________________ >> TowerTalk mailing list >> TowerTalk@contesting.com >> http://lists.contesting.com/mailman/listinfo/towertalk >> > _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```
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