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GET /hyperkitty/api/list/[email protected]/email/SZ3KPL4SB4QWXFQQDHLU7SDVFDIBMTHV/?format=api
{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/SZ3KPL4SB4QWXFQQDHLU7SDVFDIBMTHV/?format=api", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api", "message_id": "82237277654146BDB986C92000F0478F@MACBOOKPRO", "message_id_hash": "SZ3KPL4SB4QWXFQQDHLU7SDVFDIBMTHV", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/KUH6E3VF5G5HT2DXJNNMFUXOR57OMV2V/?format=api", "sender": { "address": "vk4tec (a) tech-software.net", "mailman_id": null, "emails": null }, "sender_name": "Andrew Rich", "subject": "[amsat-bb] Re: Diplexer", "date": "2011-04-09T20:39:01Z", "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/Z2ESIP4LD7TBQHWLEJPJWBTQPUI25G4W/?format=api", "children": [ "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7FGYCNW2IW43ZKIHCZXFDXYRB2UMHP5W/?format=api", "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/OMUHQMWUXKD2ODNVWZVSCVZDSOJSHJRM/?format=api", "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/AFHDGBEIONECAIGTKGGLUDFWHLWCAHKP/?format=api" ], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "DU = TX RX\nDI = RX\n----- Original Message ----- \nFrom: \"Art McBride\" <[email protected]>\nTo: \"'i8cvs'\" <[email protected]>; \"'Amsat - BBs'\" <[email protected]>; \n\"'Anthony Monteiro'\" <[email protected]>\nSent: Sunday, April 10, 2011 6:27 AM\nSubject: [amsat-bb] Re: Diplexer\n\n\n> As I understand it,\n> A Duplexer allows for transmission and reception to take place in the same\n> band using a single band antenna.\n> A Diplexer allows for transmission and reception to take place on \n> different\n> bands using a multi-band antenna.\n>\n> Art,\n> KC6UQH\n>\n> -----Original Message-----\n> From: [email protected] [mailto:[email protected]] On\n> Behalf Of i8cvs\n> Sent: Saturday, April 09, 2011 10:35 AM\n> To: Amsat - BBs; Anthony Monteiro\n> Subject: [amsat-bb] Re: Diplexer\n>\n> ----- Original Message ----- \n> From: \"Anthony Monteiro\" <[email protected]>\n> To: <[email protected]>\n> Sent: Saturday, April 09, 2011 5:15 PM\n> Subject: [amsat-bb] Re: Diplexer\n>\n>> A \"duplexor\" is a device that allows both transmitting and\n>> receiving over the same transmission line or antenna. It\n>> may or may not be a passive device and it may or may not\n>> be frequency selective.\n>>\n>> In WWII RADAR systems, a duplexor was used to allow\n>> the transmitter and receiver on the same frequency to\n>> share the same antenna. The duplexor was a waveguide\n>> device that had special gas-filled tubes to quickly\n>> switch the signal direction.\n>>\n>> 73,\n>> Tony AA2TX\n>>\n> Hi Tony, AA2TX\n>\n> I have in my hands the Instruction Book for Radar Recognition\n> Sets AN/UPX-6 of U.S. Navy Department Bureau of Ships.\n>\n> The UPX6 is a IFF transponder on board of aicrafts and was used\n> in WWII for Identification of Friend or Foe.\n>\n> The UPX-6 can transmit from 1010-1030 MHz and receive from\n> 1090-1110 MHz and allows both transmitting and receiving over\n> the same transmission line and antenna via a circuit made of coax\n> cable RG-58/CU that the manual calls a \"DUPLEXER\" and not\n> a \"duplexor\".\n>\n> This \"duplexer\" is working on the fact that a transmission line,\n> shorted at the far end a quarter wavelenght long for the incoming\n> signal,represent infinite impedance (an open circuit) at the sending\n> end of the line.\n>\n> The UPX-6 was converted in the early 1980's to be used on 1296 MHz\n> and an interesting article written by W6NBI was published in Ham\n> Radio Magazine march 1981\n>\n> I modified it and I got 40 watt output.......not too bad for that epoch\n> time !\n>\n> Best 73\" de\n>\n> i8CVS Domenico\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>\n> __________ Information from ESET NOD32 Antivirus, version of virus \n> signature\n> database 6027 (20110408) __________\n>\n> The message was checked by ESET NOD32 Antivirus.\n>\n> http://www.eset.com\n>\n>\n>\n>\n> __________ Information from ESET NOD32 Antivirus, version of virus \n> signature\n> database 6029 (20110409) __________\n>\n> The message was checked by ESET NOD32 Antivirus.\n>\n> http://www.eset.com\n>\n>\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb \n\n", "attachments": [] }