I was wondering if anyone has scene the article about using a diplexer (I think that's the right name) on both ends for a satellite setup? One where the two antennas are then a single feed then another one to split things up again by the radio. I think it was in QST but can't remember the issue or if someone has used that setup I would like some input ......Thanks and 73's
Mike N8GBU
Duplexor = tx rx more than one freq Diplexor = rx only more than one freq
Sent from my iPhone Andrew Rich
On 09/04/2011, at 11:59, "N8GBU" n8gbu@buckeye-express.com wrote:
I was wondering if anyone has scene the article about using a diplexer (I think that's the right name) on both ends for a satellite setup? One where the two antennas are then a single feed then another one to split things up again by the radio. I think it was in QST but can't remember the issue or if someone has used that setup I would like some input ......Thanks and 73's
Mike N8GBU
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I used that arrangement for several years with great luck. Just be sure the insertion loss is low. It had great mode J harmonic rejection.
I used combiners from Comet (model 4160) http://www.cometantenna.com/products.php?CatID=1&famID=6&childID=0
73, Joe kk0sd
-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Andrew Rich Sent: Friday, April 08, 2011 9:23 PM To: N8GBU Cc: AMSAT Subject: [amsat-bb] Re: Diplexer
Duplexor = tx rx more than one freq Diplexor = rx only more than one freq
Sent from my iPhone Andrew Rich
On 09/04/2011, at 11:59, "N8GBU" n8gbu@buckeye-express.com wrote:
I was wondering if anyone has scene the article about using a diplexer (I think that's the right name) on both ends for a satellite setup? One where the two antennas are then a single feed then another one to split things
up
again by the radio. I think it was in QST but can't remember the issue or
if
someone has used that setup I would like some input ......Thanks and 73's
Mike N8GBU
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Not quite... the usual understanding of the terms is that a duplexer provides isolation between 2 devices (typically a repeater transmitter and receiver) operating in the same band, while a diplexer is for devices in different bands, ie, 2 meters and 70 centimeters.
George, KA3HSW
----- Original Message ----- From: "Andrew Rich" vk4tec@tech-software.net To: "N8GBU" n8gbu@buckeye-express.com Cc: "AMSAT" AMSAT-BB@amsat.org Sent: Friday, April 08, 2011 9:22 PM Subject: [amsat-bb] Re: Diplexer
Duplexor = tx rx more than one freq Diplexor = rx only more than one freq
Sent from my iPhone Andrew Rich
On Sat, 2011-04-09 at 12:22 +1000, Andrew Rich wrote:
Duplexor = tx rx more than one freq Diplexor = rx only more than one freq
Not quite; a duplexer is typically used where you want to TX and RX simultaneously on quite close frequencies like in a repeater, and a diplexer is more commonly used where you want to TX *or* RX on two different bands.
So for combining a VHF and UHF aerial into a dual-band receiver, you'd use a diplexer. For separating the TX and RX frequencies at a repeater, you'd use a duplexer.
Gordon MM0YEQ (who is getting sick of having to tune 456MHz/461MHz duplexers)
Either term is equally correct. The prefixes di and du both indicate TWO, so it multiplexes two signals. A triplexer multiplexes three.
On 09-Apr-11 13:36, Gordon JC Pearce wrote:
On Sat, 2011-04-09 at 12:22 +1000, Andrew Rich wrote:
Duplexor = tx rx more than one freq Diplexor = rx only more than one freq
Not quite; a duplexer is typically used where you want to TX and RX simultaneously on quite close frequencies like in a repeater, and a diplexer is more commonly used where you want to TX *or* RX on two different bands.
So for combining a VHF and UHF aerial into a dual-band receiver, you'd use a diplexer. For separating the TX and RX frequencies at a repeater, you'd use a duplexer.
Gordon MM0YEQ (who is getting sick of having to tune 456MHz/461MHz duplexers)
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Since we are beating this horse. Does anyone have any pointers to units that allow more than three inputs or outputs or commercial higher power units? I want to run HF through 2.4g down a single hardline and breakout each band at both ends. This would be used instead of a remote antenna switch.
Sounds like a tall order. You want <30MHz, 145, 430, 1300, 2400 or do you also need 50, 220 and 900?
On 09-Apr-11 14:28, Floyd Rodgers wrote:
Since we are beating this horse. Does anyone have any pointers to units that allow more than three inputs or outputs or commercial higher power units? I want to run HF through 2.4g down a single hardline and breakout each band at both ends. This would be used instead of a remote antenna switch. _______________________________________________ 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
Well, I do not actually need ports for 220 and 900 "currently". I have been looking at doing this for some time. My current plan is to use stacked or series du/diplexors for the bands I want to play (<30MHz, 50, 145, 430). Upper power limit is 500w pep which makes it a little easier. If I pass the power limit, there is not much question I must run separate feed lines. Adding 1296 and 2.4g also means separate lines. (The entry panel to the shack is beginning to resemble a cell tower entry panel since I have two towers fed from one panel. One tower is hf/terrestrial <30-1296 stuff. The other is satellite 144,432,1296,2.4g)
I'm pretty certain you're going to be looking at something custom made. At qrp powers it might not be a problem to DIY a set of filters but with needing over 100dB of isolation between each band it sounds expensive.
On 09-Apr-11 15:28, Floyd Rodgers wrote:
Well, I do not actually need ports for 220 and 900 "currently". I have been looking at doing this for some time. My current plan is to use stacked or series du/diplexors for the bands I want to play (<30MHz, 50, 145, 430). Upper power limit is 500w pep which makes it a little easier. If I pass the power limit, there is not much question I must run separate feed lines. Adding 1296 and 2.4g also means separate lines. (The entry panel to the shack is beginning to resemble a cell tower entry panel since I have two towers fed from one panel. One tower is hf/terrestrial<30-1296 stuff. The other is satellite 144,432,1296,2.4g) _______________________________________________ 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
Dear Friends,
Perhaps this will help clear up the confusion.
A "diplexor" is a passive device that lets you split and/or combine signals based on their frequencies. It does not matter whether the frequencies are close together or on different bands nor does it matter if you are using it for transmitting or receiving.
A diplexor is commonly used in radio and TV broadcasting to allow two transmitters on different frequencies to share the same antenna.
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.
A typical ham radio cavity duplexor is used in FM repeater stations to allow the transmitter and receiver to share the same antenna. Since it is a passive frequency-based multiplexor, it is also a diplexor.
If you used the exact same device to instead connect two transmitters to the same antenna, it would no longer be a duplexor but it would still be a diplexor.
73, Tony AA2TX
And its diplexer and duplexer.
On 09-Apr-11 15:15, Anthony Monteiro wrote:
Dear Friends,
Perhaps this will help clear up the confusion.
A "diplexor" is a passive device that lets you split and/or combine signals based on their frequencies. It does not matter whether the frequencies are close together or on different bands nor does it matter if you are using it for transmitting or receiving.
A diplexor is commonly used in radio and TV broadcasting to allow two transmitters on different frequencies to share the same antenna.
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.
A typical ham radio cavity duplexor is used in FM repeater stations to allow the transmitter and receiver to share the same antenna. Since it is a passive frequency-based multiplexor, it is also a diplexor.
If you used the exact same device to instead connect two transmitters to the same antenna, it would no longer be a duplexor but it would still be a diplexor.
73, Tony AA2TX
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Yes Nigil, I need a spell checker on my email.
Thanks! Tony AA2TX
At 11:30 AM 4/9/2011, Nigel Gunn G8IFF/W8IFF wrote:
And its diplexer and duplexer.
----- Original Message ----- From: "Anthony Monteiro" aa2tx@comcast.net 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
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" aa2tx@comcast.net 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
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DU = TX RX DI = RX ----- Original Message ----- From: "Art McBride" kc6uqh@cox.net To: "'i8cvs'" domenico.i8cvs@tin.it; "'Amsat - BBs'" amsat-bb@amsat.org; "'Anthony Monteiro'" aa2tx@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@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" aa2tx@comcast.net 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
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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" vk4tec@tech-software.net To: kc6uqh@cox.net, "i8cvs" < domenico .i8cvs@tin.it>, " Amsat - BBs" < amsat -bb@ amsat .org>, "Anthony Monteiro " aa2tx@comcast.net Sent: Saturday, April 9, 2011 1:39:01 PM Subject: [ amsat -bb] Re: Diplexer
DU = TX RX DI = RX ----- Original Message ----- From: "Art McBride" kc6uqh@cox.net To: "'i8cvs'" < domenico .i8cvs@tin.it>; " 'Amsat - BBs'" < amsat -bb@ amsat .org>; " 'Anthony Monteiro' " aa2tx@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@ 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 " aa2tx@comcast.net 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
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http :// www . eset .com
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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
Bob,
You shouldn't need either if you plan on using a dual-band antenna. However, You'll get good uplink, but your downlink will likely suffer. Then's when you want to use a Diplexer to split your receive signal out so that you could put a preamp in line or even better, a beam antenna and preamp.
Jeff Moore -- KE7ACY
----- Original Message ----- From: "Bob- W7LRD" w7lrd@comcast.net
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
Wrong! Try again! Jeff -- KE7ACY
----- Original Message ----- From: "Andrew Rich" vk4tec@tech-software.net
DU = TX RX DI = RX
Andrew, Both Duplexer and Diplexer allow for transmit and receive at the same time.
A duplexer, as used on a 2 meter repeater has an extremely narrow filter allowing transmit on IE: 146.000 MHz and receive on 146.600 MHz. They typically use cavity resonators, each cavity is 30" tall and 7-10" in diameter and it takes 6 of them to make it work well. They must be tuned to the repeater transmit and receive frequencies.
A Diplexer is a small box with two filters allowing you to transmit on two bands, receive on two bands, or transmit on one band and receive on the other band at the same time. The diplexer keeps the bands separate to prevent damage to the equipment on the other band.
Also there exists a Triplexer which is the same as a Diplexer but it supports three bands. I have one here for 2M, 70cm, and 23cm. I use it on a triband base antenna with a Kenwood TM 741A
A Diplexer or Triplexer can be used to connect antenna connectors of radios on different bands to a common coax, three antennas to a common coax or both to use one run of coax for two or more bands.
The Circulator mentioned for the radar is different from the Duplexer and diplexer in that it allows the receiver and transmitter to be connected to the antenna while the transmitter is operating. There are T/R and anti T/R switches to prevent damage to the radar receiver during transmit and reflect receive signals that reach the transmitter to the receiver. This is a pulse echo system so receiver and Transmitter never function at the same time but require a fast antenna switching time. A typical marine radar, switches from Transmit to receive in 150 nS resulting in ~300 yards of "blindness" measured from the antenna to the first target the radar can see.
I hope this clarifies the differences. Art, KC6UQH
-----Original Message----- From: Andrew Rich [mailto:vk4tec@tech-software.net] Sent: Saturday, April 09, 2011 1:39 PM To: kc6uqh@cox.net; 'i8cvs'; 'Amsat - BBs'; 'Anthony Monteiro' Subject: Re: [amsat-bb] Re: Diplexer
DU = TX RX DI = RX ----- Original Message ----- From: "Art McBride" kc6uqh@cox.net To: "'i8cvs'" domenico.i8cvs@tin.it; "'Amsat - BBs'" amsat-bb@amsat.org;
"'Anthony Monteiro'" aa2tx@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@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" aa2tx@comcast.net 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
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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
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Amsat needs a WIKI to store all of this valuable information for hams of the future...
Roger WA1KAT
On 4/9/2011 10:53 PM, Art McBride wrote:
Andrew, Both Duplexer and Diplexer allow for transmit and receive at the same time.
A duplexer, as used on a 2 meter repeater has an extremely narrow filter allowing transmit on IE: 146.000 MHz and receive on 146.600 MHz. They typically use cavity resonators, each cavity is 30" tall and 7-10" in diameter and it takes 6 of them to make it work well. They must be tuned to the repeater transmit and receive frequencies.
A Diplexer is a small box with two filters allowing you to transmit on two bands, receive on two bands, or transmit on one band and receive on the other band at the same time. The diplexer keeps the bands separate to prevent damage to the equipment on the other band.
Also there exists a Triplexer which is the same as a Diplexer but it supports three bands. I have one here for 2M, 70cm, and 23cm. I use it on a triband base antenna with a Kenwood TM 741A
A Diplexer or Triplexer can be used to connect antenna connectors of radios on different bands to a common coax, three antennas to a common coax or both to use one run of coax for two or more bands.
The Circulator mentioned for the radar is different from the Duplexer and diplexer in that it allows the receiver and transmitter to be connected to the antenna while the transmitter is operating. There are T/R and anti T/R switches to prevent damage to the radar receiver during transmit and reflect receive signals that reach the transmitter to the receiver. This is a pulse echo system so receiver and Transmitter never function at the same time but require a fast antenna switching time. A typical marine radar, switches from Transmit to receive in 150 nS resulting in ~300 yards of "blindness" measured from the antenna to the first target the radar can see.
I hope this clarifies the differences. Art, KC6UQH
-----Original Message----- From: Andrew Rich [mailto:vk4tec@tech-software.net] Sent: Saturday, April 09, 2011 1:39 PM To: kc6uqh@cox.net; 'i8cvs'; 'Amsat - BBs'; 'Anthony Monteiro' Subject: Re: [amsat-bb] Re: Diplexer
DU = TX RX DI = RX ----- Original Message ----- From: "Art McBride"kc6uqh@cox.net To: "'i8cvs'"domenico.i8cvs@tin.it; "'Amsat - BBs'"amsat-bb@amsat.org;
"'Anthony Monteiro'"aa2tx@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@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"aa2tx@comcast.net 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
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Nah, hams of the future will have it downloaded to their chip implants at birth... :-)
George, KA3HSW
----- Original Message ----- From: "Roger Kolakowski" rogerkola@aol.com To: amsat-bb@amsat.org Sent: Sunday, April 10, 2011 8:07 AM Subject: [amsat-bb] Re: Diplexer
Amsat needs a WIKI to store all of this valuable information for hams of the future...
Roger WA1KAT
I hadn't heard... will those be socketed or flashed?
Roger WA1KAT
On 4/10/2011 4:32 PM, George Henry wrote:
Nah, hams of the future will have it downloaded to their chip implants at birth... :-)
George, KA3HSW
----- Original Message ----- From: "Roger Kolakowski"rogerkola@aol.com To:amsat-bb@amsat.org Sent: Sunday, April 10, 2011 8:07 AM Subject: [amsat-bb] Re: Diplexer
Amsat needs a WIKI to store all of this valuable information for hams of the future...
Roger WA1KAT
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On Sun, Apr 10, 2011 at 06:01:37PM -0400, Roger Kolakowski wrote:
I hadn't heard... will those be socketed or flashed?
OTP
Roger WA1KAT
-73 Diane VA3DB
Mike,
I have used such a setup for some time now, I have a 2m/70cm diplexer at my desk and one at the antennas, so that I can use one feed line (LMR-600). I also switch the heck out of the feeds with several coax relays in order to achieve different satellite modes as well as put the radios on my terrestrial vertical. I acquired the relays and diplexers over the years at hamfests and online auctions, I think I bought a diplexer or two new also.
The article you may be referring to was in the May 2010 QST, by Steve Ford WB8IMY. If you don't have that QST issue, you can view it online at ARRL if you are a Diamond Club member.
You can see a few pictures on the Satellite Antennas page of my website, http://n0jy.org. On that page there is also a link to a PowerPoint presentation of the whole antenna switching scheme. That will show you a bit about the use of the diplexers.
My experience in using this setup has been positive, I have no empirical data about signal loss or comparisons to what it was like before I went to one feedline. The cables prior to the switch were RG-8 and Belden 9913 anyway, so comparing to LMR-600 wouldn't be apples to apples. It just works good. I've had no problems with signal strength both up and down, and make all of the contacts I wish to.
73, Jerry NØJY
On 4/8/2011 8:59 PM, N8GBU wrote:
I was wondering if anyone has scene the article about using a diplexer (I think that's the right name) on both ends for a satellite setup? One where the two antennas are then a single feed then another one to split things up again by the radio. I think it was in QST but can't remember the issue or if someone has used that setup I would like some input ......Thanks and 73's
Mike N8GBU
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participants (15)
-
Andrew Rich -
Anthony Monteiro -
Art McBride -
Bob- W7LRD -
Diane Bruce -
Floyd Rodgers -
Gary "Joe" Mayfield -
George Henry -
Gordon JC Pearce -
i8cvs -
Jeff Moore -
N0JY -
N8GBU -
Nigel Gunn G8IFF/W8IFF -
Roger Kolakowski