Bill A very nice antenna farm you have for sure! If I might ask how long is your feed line from the beverage and the 4sq's to your shack? And the TX 160m distance and feed line used helix I'm guessing?
73, Fred/N0AZZ Monett, MO. -----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Bill W4ZV Sent: Monday, November 11, 2013 5:28 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] diversity receive what bands Jim Brown-10 wrote > Beverages tend to favor higher wave angles, while verticals favor low > angles. Those who have lots of land like to install both Beverages > and vertical RX arrays (Hi-Z Antennas, DX Engineering are US companies > that sell them). I've seen reports of signals appearing an hour > earlier on one antenna than the other, then disappearing from the first antenna. Beverages and vertical arrays actually have very similar takeoff angles (e.g. 25-40 degrees). Salt water dramatically lowers the lowest takeoff for verticals and a poor ground will raise it. Lengthening Beverages will also lower the takeoff angle. See Graph 3 below for an example of the latter on 160: http://www.seed-solutions.com/gregordy/Amateur%20Radio/Experimentation/Bever age.htm At 1 wavelength (~540' which is about the minimum useful Beverage length) the takeoff angle is 42 degrees. Lengthening it to 2 wavelengths lowers the angle to 27 degrees. Below are two plots (top and very bottom) of my antennas which demonstrate the difference between a low dipole (90 degree takeoff), a vertical array (22 degree takeoff) and a 2 wavelength Beverage (24 degree takeoff): http://users.vnet.net/btippett/new_page_10.htm I normally use Beverages on one port and an RX4SQ on the other port. I can also switch between the RX4SQ and my TX array (Spitfire variant). On 80 and 160 I use diversity almost 100% of the time. 73, Bill W4ZV -- View this message in context: http://elecraft.365791.n2.nabble.com/diversity-receive-what-bands-tp7580624p 7580677.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ 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 ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.3426 / Virus Database: 3222/6826 - Release Date: 11/11/13 ______________________________________________________________ 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
