Hi Don, W8JI's receiving antenna page provides excellent insight into the relative performance of various receiving antenna options, especially the RDF tables.
http://www.w8ji.com/receiving.htm The Shared Apex Loop Arrays (SAL-20, SAL-30) are not listed, their RDFs are in the order of 8-9 dB. Many topbanders have had good success with the SAL-30 in a very small space . There's a similar RDF chart on the Hi-Z web site that includes some of the Hi-Z antennas. http://www.hizantennas.com/receiving_antennacomparison_char.htm W8JI's webpage has an excellent description of arrays of small verticals : http://www.w8ji.com/small_vertical_arrays.htm 4-square arrays provide several dB improved RDF compared to loop arrays, for example the 4 element Hi-Z array RDF is in the order of 11-12 dB. To do much better you would need to go to a much larger monoband eight element vertical array such as the Hi-Z 8 (200 foot diameter on top band). http://www.hizantennas.com/8_element_arrays.htm 73 Frank W3LPL ----- Original Message ----- From: [email protected] To: [email protected], [email protected] Sent: Saturday, November 22, 2014 1:04:02 PM Subject: Topband: receive antenna opinions Dear Group I have hit the limits of my antenna's and have come to the realization I am more TX than RX, which I guess is the norm for the topband and 80m. Anyway am considering putting a second receiver in my K3 and putting up a receive only antenna. Things that I have been looking at are as follows The shared alex loop array either a SAL 20 or 30 The other is the Hi-Z system either the 3 or 4 antenna receive system. I do not have the acreage for a beverage system but I have room for one of the above. So I wish to get opinions and pros & cons as I have learned its better to learn from others on what did or did not work well or what compromises they made as once you spend the money you can not get it back and you have to live with your choices. Thanks in advance for all your help and advice. ~73 Don KD8NNU FH#4107 -.- -.. ---.. –. –. ..- _________________ Topband Reflector Archives - http://www.contesting.com/_topband _________________ Topband Reflector Archives - http://www.contesting.com/_topband
