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Thread: Duplexer or Antenna Switch?

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  1. #1

    Red face Duplexer or Antenna Switch?

    I'm using two Transceivers.

    One for HF and the second for VHF/UHF. My multiband aerial will cover all these bands.

    If i connect the aerial to the two transceivers (one antenna to two transceivers) should i use a Duplexer or a 2 way antenna coax switch?

    Many thanks in advance

    73 de Rod /2E0RPS
    73 de Rod 2E0RPS
    [url]http://www.qrz.com/db/2E0RPS[/url]

  2. #2

    Default

    Rod,

    You need the 2-way coax switch.

    By the way, I'm intrigued to know what antenna you have that's giving you HF, VHF and UHF coverage?

    73,
    Steve

  3. #3

    Default

    Thanks Steve,

    I've got a 2way coax switch but it think it was designed for CB only not sure if i can use it on HF/VHF/UHF bands.

    In regard to the antenna I'm using a Sandpiper MV6+3 multiband vertical made in Britain.

    in reality the antenna is designed to cover 80 to 6m. However with the addition of counterpoise wire it works well on all HF bands including 2m and 70cm in the sense that i can engage all city repetaers with an overall VHF/UHF SWR below 1.7.

    73 de Rod / 2E0RPS
    73 de Rod 2E0RPS
    [url]http://www.qrz.com/db/2E0RPS[/url]

  4. #4

    Default

    I disagree. You can use a 2-way switch, sure, but then you'd be on "either" HF or VHF/UHF and you couldn't use them both at the same time.

    With a duplexer, you can use both rigs simultaneously, up to the power limitation and isolation rating of the duplexer.

    I have some from Comet rated 600W PEP on HF and 200W PEP on VHF-UHF and they are essentially lossless and have >60 dB isolation HF:VHF. As such, just as efficient as a "switch," but allows operation with both rigs and a common antenna at the same time.

    The duplexer is likely to cost more, but not that much more. A very good coax switch that's low loss and high isolation at UHF is in the $80 range ($USD). A duplexer to do this job is in the $100 range ($USD), so the premium is not large for the added versatility.

    WB2WIK/6

  5. #5

    Default

    Quote Originally Posted by WB2WIK View Post
    I disagree. You can use a 2-way switch, sure, but then you'd be on "either" HF or VHF/UHF and you couldn't use them both at the same time.

    With a duplexer, you can use both rigs simultaneously, up to the power limitation and isolation rating of the duplexer.

    I have some from Comet rated 600W PEP on HF and 200W PEP on VHF-UHF and they are essentially lossless and have >60 dB isolation HF:VHF. As such, just as efficient as a "switch," but allows operation with both rigs and a common antenna at the same time.

    The duplexer is likely to cost more, but not that much more. A very good coax switch that's low loss and high isolation at UHF is in the $80 range ($USD). A duplexer to do this job is in the $100 range ($USD), so the premium is not large for the added versatility.

    WB2WIK/6
    ::Thought I'd give you a reference. I see Comet now has a "600W" model that does exactly what you're looking for, and it's cheap:

    Model CF-360A:

    HF/6M-440MHz Duplexer
    Band Pass
    1.3-30MHz
    49-470MHz
    Ins. Loss
    0.2dB
    0.2dB
    Max Power
    600w PEP
    600w PEP
    Isolation:
    More than 45dB
    CONNECTORS:
    Output:
    PL-259
    Low In:
    SO-239
    High In:
    SO-239

    73

    Steve WB2WIK/6

  6. #6
    Join Date
    Dec 2002
    Posts
    745

    Default

    Isn't the correct term a "diplexer"? I thought a duplexer was used when simultaneously transmitting and receiveing on the same antenna...ie a repeater.
    Last edited by K3ACE; 09-11-2008 at 09:29 PM.
    -Norm
    Living continuously since 1957

  7. #7

    Default

    Thanks for your input WB2WIK

    I see your point. Obviously the possibility to use the rigs simultaneously without switching is a better option.

    73 de Rod /2E0RPS
    73 de Rod 2E0RPS
    [url]http://www.qrz.com/db/2E0RPS[/url]

  8. #8

    Default

    Quote Originally Posted by K3ACE View Post
    Isn't the correct trem a "diplexer"? I thought a duplexer was used when simultaneously transmitting and receiveing on the same antenna...ie a repeater.
    ::In this case, the term "duplexer" is appropriate, as you can indeed transmit and receive simultaneously using one: You can transmit on HF and receive on VHF (duplex); or the other way around (duplex); or you can receive on both bands (diplex); or you can transmit on both bands (diplex).

    I think "duplexer" is a perfect description of what these little units truly are.

    WB2WIK/6

  9. #9
    Join Date
    Dec 2002
    Posts
    745

    Default

    Quote Originally Posted by WB2WIK View Post
    ::In this case, the term "duplexer" is appropriate, as you can indeed transmit and receive simultaneously using one: You can transmit on HF and receive on VHF (duplex); or the other way around (duplex); or you can receive on both bands (diplex); or you can transmit on both bands (diplex).

    I think "duplexer" is a perfect description of what these little units truly are.

    WB2WIK/6

    Didn't think of it that way. Of course you can listen to a subband while txing on the primary. I am that much smarter now.
    -Norm
    Living continuously since 1957

  10. #10

    Default

    Thanks again.

    The antenna will be connected to a Yaesu FT920 (HF to 6m) and an IC 706MKIIG (2 to 70cm) in few words the duplexer has to cover 1.3 to 50mhz / 144-440mhz. Will have to be a different model than the one you mentioned. in anycase i understood what i need now..many thanks 73 de Rod /2E0RPS


    Quote Originally Posted by WB2WIK View Post
    ::Thought I'd give you a reference. I see Comet now has a "600W" model that does exactly what you're looking for, and it's cheap:

    Model CF-360A:

    HF/6M-440MHz Duplexer
    Band Pass
    1.3-30MHz
    49-470MHz
    Ins. Loss
    0.2dB
    0.2dB
    Max Power
    600w PEP
    600w PEP
    Isolation:
    More than 45dB
    CONNECTORS:
    Output:
    PL-259
    Low In:
    SO-239
    High In:
    SO-239

    73

    Steve WB2WIK/6
    73 de Rod 2E0RPS
    [url]http://www.qrz.com/db/2E0RPS[/url]

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