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Thread: UHF/VHF

  1. #1
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    UHF/VHF

    I have a what appears too be a VHF antenna base, it has one of those small bayonet fittings at the end of the coax that connects to the back of a radio (I don't have the radio) the base has RFI on it, the antenna is a steel whip that has to be tuned, can i use this base for a UHF antenna in place of the steel whip

    My antenna is permenently mounted, I can't interchange antennas.

    Baz.
    Cheers Baz.

    2011 Discovery 4 SE 2.7L
    1990 Perentie FFR EX Aust Army
    1967 Series IIa 109 (Farm Truck)
    2007 BMW R1200GS
    1979 BMW R80/7
    1983 BMW R100TIC Ex ACT Police
    1994 Yamaha XT225 Serow

  2. #2
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    You SHOULD be able to use that same antenna base for both a UHF and VHF whip. You can buy a ready made UHF whip that will screw on, or you can just cut down the VHF whip to UHF length - you'll need a cutting chart or VSWR meter so you can tune it to the right length- it's about 6" but exact length will depend on a few factors. ( a few mm can make quite a difference to performance )
    As for the connector - sounds like it is a BNC fitting. If your radio doesn't have that, you can buy adaptors that will change from one style to another. You'll get a bit of loss doing that but nothing you'd notice.
    RFI is the name of the manufacturer - used a lot in commercial circles.

    Your question was a bit unclear so hope that helps a bit !

  3. #3
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    Thanks Wayne, I have an SWR meter from my 27Mhz days, will this work for UHF.

    Baz.
    Cheers Baz.

    2011 Discovery 4 SE 2.7L
    1990 Perentie FFR EX Aust Army
    1967 Series IIa 109 (Farm Truck)
    2007 BMW R1200GS
    1979 BMW R80/7
    1983 BMW R100TIC Ex ACT Police
    1994 Yamaha XT225 Serow

  4. #4
    JDNSW's Avatar
    JDNSW is offline RoverLord Silver Subscriber
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    Quote Originally Posted by Redback View Post
    Thanks Wayne, I have an SWR meter from my 27Mhz days, will this work for UHF.

    Baz.
    Probably not! Most 27mHz swr meters are limited to about 30mHz - UHF is 400!


    John
    John

    JDNSW
    1986 110 County 3.9 diesel
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  5. #5
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    PICS PICS PICS!


    a bit slow these days Baz,,

    cold down there in the 'warra?
    "How long since you've visited The Good Oil?"

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  6. #6
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    Quote Originally Posted by JDNSW View Post
    Probably not! Most 27mHz swr meters are limited to about 30mHz - UHF is 400!


    John
    Thanks John.

    Quote Originally Posted by Pedro_The_Swift View Post
    PICS PICS PICS!


    a bit slow these days Baz,,

    cold down there in the 'warra?
    Yes i know no pics, I'm just seeing if i can use it first.

    It's pretty warm this morning at 14, earlier it was 7 though, the last few days have been a bit warmer than usual.
    Might be different next weekend though, at Oberon

    Baz.
    Cheers Baz.

    2011 Discovery 4 SE 2.7L
    1990 Perentie FFR EX Aust Army
    1967 Series IIa 109 (Farm Truck)
    2007 BMW R1200GS
    1979 BMW R80/7
    1983 BMW R100TIC Ex ACT Police
    1994 Yamaha XT225 Serow

  7. #7
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    I always reckoned Sunny Corner was colder---

    Brrrrrr!
    "How long since you've visited The Good Oil?"

    '93 V8 Rossi
    '97 to '07. sold.
    '01 V8 D2
    '06 to 10. written off.
    '03 4.6 V8 HSE D2a with Tornado ECM
    '10 to '21
    '16.5 RRS SDV8
    '21 to Infinity and Beyond!


    1988 Isuzu Bus. V10 15L NA Diesel
    Home is where you park it..

    [IMG][/IMG]

  8. #8
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    Yes we need pics - not sure what you mean by "can't interchange antennas"
    I'm a bit confused as to what you have there - RFI do make a lot of different models.
    Maybe you need to go through the RFI VHF antennas on their website and see which one looks like yours
    http://www.rfi.com.au/wireless/mobil...-antennas.html
    If you've got one of the ground independent type with the "MBC" bases, I suspect those bases are unique to each band because they have a transformer inside them - but I'm not sure - I can ask the techos at work or maybe phone RFI.

  9. #9
    JDNSW's Avatar
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    Quote Originally Posted by Pedro_The_Swift View Post
    I always reckoned Sunny Corner was colder---

    Brrrrrr!
    If you are comparing Sunny Corner and Oberon, I don't think there is much to choose - both are in the running as the coldest inhabited places in Australia!

    John
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

  10. #10
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    Quote Originally Posted by waynep View Post
    Yes we need pics - not sure what you mean by "can't interchange antennas"
    I'm a bit confused as to what you have there - RFI do make a lot of different models.
    Maybe you need to go through the RFI VHF antennas on their website and see which one looks like yours
    Mobile Antennas | Wireless | RF Industries
    If you've got one of the ground independent type with the "MBC" bases, I suspect those bases are unique to each band because they have a transformer inside them - but I'm not sure - I can ask the techos at work or maybe phone RFI.
    ATM I have a Mobile One 4.5g antenna and it doesnt remove from the base, so to change to a higher gain i need to replace the whole thing right back to the CB

    This


    I've always liked the Mobile One antennas, they have always been very good, especially 27Mhz
    Cheers Baz.

    2011 Discovery 4 SE 2.7L
    1990 Perentie FFR EX Aust Army
    1967 Series IIa 109 (Farm Truck)
    2007 BMW R1200GS
    1979 BMW R80/7
    1983 BMW R100TIC Ex ACT Police
    1994 Yamaha XT225 Serow

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