CB Radio

Discussion in 'Motorhome Chat' started by DanielFord, Nov 9, 2014.

  1. DanielFord

    DanielFord Funster

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    For reasons far to complicated and uninteresting to go into here, I was clearing my mothers loft this weekend, and of all things, I found my old CB radio, and I am considering fitted it to out MH.

    I know the subject has been raised a few times in the past, however I can't really work out the answer from previous threads. How many peeps on here have CB's fitted to their MH's? I am just wondering whether it is worthwhile to fit it or not.
     
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  2. GWAYGWAY

    GWAYGWAY Funster

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    I prefer to speak to them on the mobile. CB is sooooo old hat now.
     
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  3. gloworm

    gloworm Funster

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    Although i dont use one myself anymore i think there are still a lot of truckers using them who are always willing to pass on usefull help & information,

    Go for it
    Eric
     
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  4. Jaws

    Jaws Funster Life Member

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    Just bought a new antenna mount for mine.. It is going back in the motorhome as soon as I get the time..
    As a by the by, make sure it aint an old AM unit you have dug out !
    It should have either 27/81 or MPT1320 or indeed the later MPT1321 or MPT 1382 if the unit is dual band ( as in CEPT and old UK channels )

    Since 2006 the requirement to hold a CB radio licence has been abolished
     
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  5. DanielFord

    DanielFord Funster

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    It is a good old 27/81, if it works out, I may invest in a new one with the EU frequencies, but who knows?
    Out of interest, what mount have you got? I was going to go for a side mount on the side and ground it out to the chassis. Any comments?
     
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  6. Tootles

    Tootles Funster

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    BE VERY CAREFUL!! You might pick up a TRUCKER!!!!!:Eeek::Eeek::Eeek:
     
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  7. Bertie Bassett

    Bertie Bassett Read Only Funster

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    And that's another one we know a song about..........................;)
     
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  8. jollyrodger

    jollyrodger Funster Life Member

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    Stateside booming in at the moment ::bigsmile:
     
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  9. Tootles

    Tootles Funster

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    Yes we do, Geoffrey.........

     
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  10. Bertie Bassett

    Bertie Bassett Read Only Funster

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    Brilliant...........................great minds etc:D
     
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  11. DanielFord

    DanielFord Funster

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    I love that sketch
     
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  12. Tootles

    Tootles Funster

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    So do other truckers we know, don't they, Bungle??:):)
     
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  13. Bertie Bassett

    Bertie Bassett Read Only Funster

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    We do Geoffrey, we do!:cautious:...............:D
     
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  14. Jaws

    Jaws Funster Life Member

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    As I usually not want to drill a hole ( or two ) I tend to go for a lip mount and put it on the bonnet..

    [​IMG]


    I have a quick release mount that the Z27 antenna screws in to.
    The quick release has a standard 3/8 x 24 thread and screws in to the base mount, and you screw the antenna in the top half..
    So it is very quick and easy to lift the bonnet should I need to..............

    [​IMG]
     
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  15. DanielFord

    DanielFord Funster

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    Thanks Jaws, I will have to measure up, but I suspect that because of our overcab I will not be able to fit a 1.5m antenna on the bonnet (that is the size I have decided to go with). I think that for the same reason I can't go for the side of the cab either.
    A more expensive solution may be to get a bike rack fitted, the I have somewhere at the back to mount the antenna.
     
  16. Jaws

    Jaws Funster Life Member

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    Yessss... but that is not going to give you much ground plane to say the least.
    We had a massive over hand on the Miller and the one on the current Autotrail is not much less..
     
  17. Chockswahay

    Chockswahay Funster

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    Crikey......... I just spent 10 minutes trying to work out where my post to this thread went:eek:

    Then I discovered it was HERE :eek:
     
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  18. DanielFord

    DanielFord Funster

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    The Sundance bike rack goes on a bar that protrudes from the chassis at the rear, but I think it is aluminium, and therefore useless as a ground plane.
    Out of interest what length antenna do you have on the autotrail?
     
  19. jollyrodger

    jollyrodger Funster Life Member

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    Quite a few it seems
    Have had one on and of since way way back have one fitted in the van and a ssb/am/fm 24-32 when on site venues for fun DXing ;)
     
  20. Jaws

    Jaws Funster Life Member

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    Ally is one of the best things to use as a ground plane !
    But... Your radiation pattern will be shot to bits..
    You will have very little radiated backwards ( the radiating pattern will follow the line of the ground plane ) and of course forward pattern will be far from great as the bulk of the van will be in the way :(

    Antenna length
    The Z27 has a coil at the bottom that is about 7" long and the whip is about 4 ft
    The rule is .. the more coil the lower the Q of the antenna.. That means less efficiency, far less band width, and harder to tune
    Base loaded antenna are better than centre or top loaded units though

    Unless you are going for something like a 102" whip which I do have but absolutely NO chance of mounting it somewhere that it will work properly ! ) any mobile antenna is always going to be a compromise.

    The better ones are the old K40 and the newer Wilson offerings
    They are 'shunt fed'** antennas same as the old 'silver rod' base antenna.
    The shunt windings pretune the coil but still allows fine tuning by altering the length of the whip for best radiation

    It is essential that what ever type you use it is 'tuned' to the centre frequency ( channel ) you are going to use.
    If the SWR ( Standing Wave Ratio ) is too high you end up cooking the output transistor(s) and paying someone like me some of your hard earned to replace then !


    **Shunt fed
    It is a tuned coil with a tapping which is shorted to earth. The circuit is precisely tuned to ( in the case of cb stuff ) 27 megs.. but gives a reasonable band width which means it will stay pretty much in tune from low 26 to high 27 megs
     
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