Hello,hi support link W1GHZ Paul website: http://www.w1ghz.org/small_proj/hna.zip 73 de iw5bsf Roberto ----- Original Message ----- From: "i8cvs" <[email protected]> To: "John Kopala" <[email protected]>; "Amsat - BBs" <[email protected]> Sent: Tuesday, April 26, 2011 2:16 AM Subject: [amsat-bb] Re: Arrow and ELK comparative antenna tests
> Hi John, N7JK > > Since you are interested in accurate antenna gain measurements and > comparison I suggest you to read also the following articles: > > ANTENNA GAIN MEASUREMENTS Part 1 : Technique- the fine points > of making accurate gain measurements without access to a professional > antenna range. by Fred Brown W6HPH > published on QST November 1982 pages 35 to 37 > > ANTENNA GAIN MASUREMENTS Part 2 : Intrumentation- simple,easy > construction instruments permit a precise determination of antenna gain > by Fred Brown W6HPH > published on QST December 1982 pages 27 to 31 > > UHF ANTENNA RATIOMETRY : Inconsistent results in checking antenna > gain ? Here is a technique that can restore your faith in measurements and > speed up empirical designe by Richard T. Knadle W2RIW > published on QST February 1976 pages 22 to 25 > > 73" de > > i8CVS Domenico > > ----- Original Message ----- > From: "John Kopala" <[email protected]> > To: <[email protected]> > Sent: Monday, April 25, 2011 11:29 PM > Subject: [amsat-bb] Re: Arrow and ELK comparative antenna tests > > >> One supplemental note on the testing of the Arrow and ELK antennas. >> >> I indicated that having both the transmit and receive antennas in the >> same >> plane with the ELK might have some advantages. >> >> I failed to mention that having the crossed yagi design of the Arrow >> isolates the 2 antennas from each other and may help to minimize UHF >> downlink desensing when transmitting on a VHF uplink. This >> can vary greatly with the configuration and the radios used, but >> certainly >> would provide significant isolation when separate radios are used for the >> uplink and downlink. >> Recent posts on the Alinco DJ-G7 also highlight the fact that the radio >> itself my desense on one band when transmitting on the other. >> In that case, all the isolation in the world might not make any >> difference. >> >> John Kopala >> N7JK >> > > _______________________________________________ > Sent via [email protected]. Opinions expressed are those of the author. > Not an AMSAT-NA member? Join now to support the amateur satellite program! > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
