Hi Craig, What you are describing is an antenna in the dipole class, an antenna with two poles. Similar to an inverted vee rotated by 225 degrees. The half wavelength for the sum of the two elements will determine the resonant frequency. The total length will be near the classic 468/MHz = length in feet.
The easy way is to make the antenna a little longer, measure the resonant frequency with an antenna analyzer, then scale to the desired frequency, for example, for 14.05 MHz. 468 / 14.05 = 33.3' make each element 1/2 of 33.3' plus about a foot, or 17.5' each. Using an antenna analyzer, measure the resonant frequency, it should be close to 13.4 MHz. Divide the measured frequency by the desired frequency, for example 13.4 / 14.05 = 0.954. Multiply the start lengths by the ratio, 17.5 * 0.954 = 16.7' for each of the two lengths. The above antenna will require a current mode Balun, for example the Elecraft BL2. Also, when modeling the gain pattern, it has about a 3 dB front to back gain ratio. The front being the side with the horizontal wire. I hope this helps, John KN5L On 07/26/2014 08:27 AM, CRAIG W BEHRENS wrote: > What I want to do is have an elevated vertical (say base at 8'-10'), and add > a temporary 1/4-wave "reference" counterpoise wire with a 20-degree downward > slope. ______________________________________________________________ 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 list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
