Hello Gary, Just be careful comparing information you receive from different sources! That is why we put together the VE7BQH comparison table, with all antennas listed in FREE SPACE GAIN COMPARED TO A DIPOLE (DBD). Gain figures look unbelievably good when an antenna gain in dBi is compared to a conservative dBD value. Many antenna performance calculating programs also include up to 6 dB of extra gain for the peak GROUND GAIN LOBE when the antenna is aimed on the horizon over flat perfectly conducting ground. Be sure you compare apples to apples or you will be very disappointed in whatever antenna you build. Good luck and VY 73, Lance
On 3/18/2010 5:03 PM, Lew Phelps K6LMP wrote: > > For a Yagi to achieve gain similar to a three-element quad, you need to > double the > boom length. If you look at the marvelous spreadsheet that VE7BQH posted a > bit > earlier, you'll see that single Yagis of about the same boom length as the > three-element quad offer free space gain of only about 5.5 to 6.5 dB, and > Yagis > with about 9.5dB have boom lengths of roughly 1.1 wavelengths, more thn twice > as > long as needed for a comparable gain quad. -- Lance Collister, W7GJ (ex: WN3GPL, WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, E51SIX) P.O. Box 73 Frenchtown, MT 59834 USA QTH: DN27UB TEL: (406) 626-5728 URL: http://www.bigskyspaces.com/w7gj 2m DXCC #11/6m DXCC #815 Interested in 6m EME? Ask me about subscribing to the MAGIC BAND EME email reflector! ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
