Hi Luc, VE2DWE Standing behind the reflector connect first one reflector element Vertical with the U bolt attachement to your left side Then mount a drive element Vertical with the U bolt attachement to your left side.The driving element must be mounted with the gamma match arm looking upword and the N connector looking in your direction i.e. the back of the antenna. The rest is automatic and straigforward because the Horizontal driving element will be mounted after the Vertical one closer to the satellite with the gamma match arm appearing on your right side with the N connector looking on the back and the U bolt mounted in the lower part of the boom . Since the driven element is 50 ohm as adjusted in the factory connect a 1/4 electrical wavelength of 75 ohm coax cable to each driven element and connect it in parallel to a T connector to get an impedance transformation of about 50 ohm For RHCP connect to the Horizontal driven element a 1/4 electrical wavelenght of 50 ohm coax delay line using a double female barrel. If you add the delay line to the vertical harm then you get LHCP The A432-20T is a very BAD antenna and because of too many connectors (one T and one double female ) you will experience very high losses in 70 cm In a separate email I have sent to you the schematic diagram for the phasing harness and while it is for the A144-20T the concept is the same
73" de i8CVS Domenico ----- Original Message ----- From: "Luc Leblanc" <luclebla...@videotron.ca> To: <amsat-bb@amsat.org> Cc: <eu-am...@yahoogroups.com> Sent: Friday, September 18, 2009 6:21 PM Subject: [amsat-bb] Cushcraft A432-20T > I just get a Cushcraft A432-20T at a recent Hamfest. As per the theory if the longest matching line is connected to the horizontal element > and the shortest to the vertical one i should have a RHCP but if i reverse the connections should i have LHCP? If i rotate the antenna by > 90 degress how i can determine the horizontal versus the vertical elements? The only one reference i have is the U bolt attachment to > determine the horizontal elements or one driven elements is the closest to the reflector (further away behind the other driven element). > > There is no marking on the beam only the driven elements caps are both marked with 1/2 SC? This model was not made with a switching device > and as i don'r have the specs sheet i'm in the blind to configure it to RHCP as it seems it is the actual UHF standard on the circular > LEO's fleet? > > Thank's for your help > > > "-" > > > Luc Leblanc VE2DWE > Skype VE2DWE > www.qsl.net/ve2dwe > DSTAR urcall VE2DWE > WAC BASIC CW PHONE SATELLITE > > > _______________________________________________ > Sent via amsat...@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...@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
