[amsat-bb] Re: Diplexer

[Andrew Rich]

DU = TX RX
DI = RX
----- Original Message ----- 
From: "Art McBride" <kc6uqh at cox.net>
To: "'i8cvs'" <domenico.i8cvs at tin.it>; "'Amsat - BBs'" <amsat-bb at amsat.org>; 
"'Anthony Monteiro'" <aa2tx at comcast.net>
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 at amsat.org [mailto:amsat-bb-bounces at 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" <aa2tx at comcast.net>
> To: <amsat-bb at 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
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