DU = TX RX DI = RX ----- Original Message ----- From: "Art McBride" <[email protected]> To: "'i8cvs'" <[email protected]>; "'Amsat - BBs'" <[email protected]>; "'Anthony Monteiro'" <[email protected]> Sent: Sunday, April 10, 2011 6:27 AM Subject: [amsat-bb] Re: Diplexer
> As I understand it, > A Duplexer allows for transmission and reception to take place in the same > band using a single band antenna. > A Diplexer allows for transmission and reception to take place on > different > bands using a multi-band antenna. > > Art, > KC6UQH > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of i8cvs > Sent: Saturday, April 09, 2011 10:35 AM > To: Amsat - BBs; Anthony Monteiro > Subject: [amsat-bb] Re: Diplexer > > ----- Original Message ----- > From: "Anthony Monteiro" <[email protected]> > To: <[email protected]> > Sent: Saturday, April 09, 2011 5:15 PM > Subject: [amsat-bb] Re: Diplexer > >> A "duplexor" is a device that allows both transmitting and >> receiving over the same transmission line or antenna. It >> may or may not be a passive device and it may or may not >> be frequency selective. >> >> In WWII RADAR systems, a duplexor was used to allow >> the transmitter and receiver on the same frequency to >> share the same antenna. The duplexor was a waveguide >> device that had special gas-filled tubes to quickly >> switch the signal direction. >> >> 73, >> Tony AA2TX >> > Hi Tony, AA2TX > > I have in my hands the Instruction Book for Radar Recognition > Sets AN/UPX-6 of U.S. Navy Department Bureau of Ships. > > The UPX6 is a IFF transponder on board of aicrafts and was used > in WWII for Identification of Friend or Foe. > > The UPX-6 can transmit from 1010-1030 MHz and receive from > 1090-1110 MHz and allows both transmitting and receiving over > the same transmission line and antenna via a circuit made of coax > cable RG-58/CU that the manual calls a "DUPLEXER" and not > a "duplexor". > > This "duplexer" is working on the fact that a transmission line, > shorted at the far end a quarter wavelenght long for the incoming > signal,represent infinite impedance (an open circuit) at the sending > end of the line. > > The UPX-6 was converted in the early 1980's to be used on 1296 MHz > and an interesting article written by W6NBI was published in Ham > Radio Magazine march 1981 > > I modified it and I got 40 watt output.......not too bad for that epoch > time ! > > Best 73" de > > i8CVS Domenico > _______________________________________________ > 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 > > __________ Information from ESET NOD32 Antivirus, version of virus > signature > database 6027 (20110408) __________ > > The message was checked by ESET NOD32 Antivirus. > > http://www.eset.com > > > > > __________ Information from ESET NOD32 Antivirus, version of virus > signature > database 6029 (20110409) __________ > > The message was checked by ESET NOD32 Antivirus. > > http://www.eset.com > > > _______________________________________________ > 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
