Hi Fred, Loss is generally not a problem for RX antennas on the low bands because it's low (even for RG6) and ambient atmospheric noise is high. The RX4SQ uses a run of 800' and the Beverages use from 200-500', all RG6. The TX antenna uses about 350' of surplus 7/8" Heliax which replaced RG8 several years ago. That gained <1 dB but it was cheap and much more rugged than RG8.
73, Bill Fred Smith wrote > 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-bounces@.qth > [mailto: > elecraft-bounces@.qth > ] On Behalf Of Bill W4ZV > Sent: Monday, November 11, 2013 5:28 AM > To: > elecraft@.qth > 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@.qth > > 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@.qth > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html -- View this message in context: http://elecraft.365791.n2.nabble.com/diversity-receive-what-bands-tp7580624p7580685.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
