I'm really trying to "absorb" all this diplexers / duplexor thread. Specifically I have a new FT-8800 and want to run FM sats from my truck. Not wanting to reinvent the wheel would a simple dual band whip suffice. Then maybe requiring a preamp, and how all that works maybe with a di / du etc. My head is starting to hurt.
73 Bob W7LRD ----- Original Message ----- From: "Andrew Rich" <[email protected]> To: [email protected], "i8cvs" < domenico [email protected]>, " Amsat - BBs" < amsat -bb@ amsat .org>, "Anthony Monteiro " <[email protected]> Sent: Saturday, April 9, 2011 1:39:01 PM Subject: [ amsat -bb] Re: Diplexer DU = TX RX DI = RX ----- Original Message ----- From: "Art McBride" <[email protected]> To: "'i8cvs'" < domenico [email protected]>; " 'Amsat - BBs'" < amsat -bb@ amsat .org>; " '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: amsat -bb-bounces@ amsat .org [ mailto : amsat -bb-bounces@ amsat .org] > 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: < amsat -bb@ amsat .org> > 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 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 > > __________ 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 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 [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
