Thanks Dominico I have also compared my unit with an HP network analyzer and have found the readings to be quite acceptable for amateur work. Mine reads 1.0 :1 into a precision load up to 170 MHz. Indeed, it reads 1.1:1 at UHF and that is just fine for my measurements. Rarely do I see an antenna match less than 1.1:1.
73, Pete --- On Sun, 3/6/11, i8cvs <domenico.i8...@tin.it> wrote: From: i8cvs <domenico.i8...@tin.it> Subject: Re: [amsat-bb] Re: Antenna Analyzer To: "Pete Rowe" <ptr...@yahoo.com>, "AMSAT BB" <amsat-bb@amsat.org>, "Howard Kowall" <hkow...@shaw.ca> Date: Sunday, March 6, 2011, 9:40 AM Hi Pete, WA6WOA I do not recommend the MFJ-269 antenna analyser because it is very inaccurate particularly on 435 MHz I have compared the MFJ-269 with several professional network analysers and I have found that at most the MFJ is usable up to 30 MHz maximum because above 30 MHz the inaccuracy on the real part and the imaginary part of the impedance reading becomes absolutely unacceptable. My MFJ-269 was purchased as new but connecting to it a professional 50 ohm termination good up to 12 GHz the VSWR shown at 435 MHz was 1.1 I have sent back my MFJ to the factory for inspecting and calibration but I belive that the above instrument was a very bad affair for me and will be a bad affair for all that intend to use the analyser above 30 MHz. Be happy with your MFJ-269 even if dreaming while sleeping I am sure that my message made you suspect a wrong real part and a wrong imaginary part on your impedance reading ! Best 73" de i8CVS Domenico ----- Original Message ----- From: "Pete Rowe" <ptr...@yahoo.com> To: "AMSAT BB" <amsat-bb@amsat.org>; "Howard Kowall" <hkow...@shaw.ca> Sent: Sunday, March 06, 2011 4:45 PM Subject: [amsat-bb] Re: Antenna Analyzer Hi Howard I wouldn't be without my MFJ-269 analyzer. It is very accurate and a handy size. Highly recommended. (no, I don't own stock in MFJ) One word of caution: mine (and maybe there is something wrong with mine) draws some power from the batteries with the power switch OFF. So I take one of the batteries out when not in use. 73, Pete WA6WOA --- On Sun, 3/6/11, Howard Kowall <hkow...@shaw.ca> wrote: From: Howard Kowall <hkow...@shaw.ca> Subject: [amsat-bb] Antenna Analyzer To: "AMSAT BB" <amsat-bb@amsat.org> Date: Sunday, March 6, 2011, 6:16 AM Hello to everyone I am seriously thinking about buying an antenna analyzer,I build enough antennas to justify buying one.I enjoy building HF,VHF,UHF antennas of all flavors.The standard swr bridge is just not cutting it anymore.So I guess what I am looking for is one that will do 3mhz to 500mhz,nice to have computer interface but not a priority.I have seen a few on the internet but its nice to get some user input,rather then the sales pitches. Thanks to all who read and reply in advance Howard VE4ISP _______________________________________________ Sent via AMSAT-BB@amsat.org. 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 AMSAT-BB@amsat.org. 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 AMSAT-BB@amsat.org. 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
