New truck cb/antenna issues,why?

Discussion in 'CB Radio Forum' started by craig_sez, Jul 15, 2021.

  1. craig_sez

    craig_sez Road Train Member

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    Im just gonna say WATCH THIS!!




    Now read this.....Bonding
     
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  3. Ridgeline

    Ridgeline Road Train Member

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    Ok?

    what does the video have to do with this?
     
  4. craig_sez

    craig_sez Road Train Member

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    Its the lack of a good connection between materials..Rf has a hard time to travel amongst all its 50 billion parts that make up the outer skin of the truck..The more bonding a fella can do to make it easier for rf to leave and return to its source the better..
     
  5. Ridgeline

    Ridgeline Road Train Member

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    Well yes and no.

    The key panels are not in the sleeper for but in the cab.
     
  6. craig_sez

    craig_sez Road Train Member

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    My point is that its just a poor path for rf to travel and bonding as much as possible will go a long ways..Not like drivers are gonna rip apart the trucks to bond the innerds but do as much as possible like...
    Floor to wall
    Floor to chassie
    Chassie to engine block
    Maybe even get crazy and go floor to the skirting brackets....
    Only got my doors done yet so hopefully this week i can door more..Truck has electrical issues with the mcm module and its gotta be ordered from states..So im taken a week off anyways to do #### around the house and hopefully put some time in the truck..I got 40ft of 1" tight braded line,just need some ends and heat shrink..
     
  7. Night Stalker10

    Night Stalker10 Road Train Member

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    I was under the impression that too much grounding or bonding isn't good either. The effect is the same as adding a long ground wire to a mobile antenna because of high swr.
     
  8. Ridgeline

    Ridgeline Road Train Member

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    Well I see where you are going but I am going to point back to how rf radiation systems work, you have to balance it out first.

    Alan’s summary on his site is close to the truth of what to think, so …

    A vehicle is not a ground plane, but rather acts like a capacitor between the antenna and the surface under the vehicle which acts as the ground plane. Since the surface in question is a poor conductor of RF, ground losses occur. If we wish to maximize the system efficiency (the mobile station as a whole), we need to maximize the RF continuity of the vehicle, hence proper bonding. Obviously, proper antenna mounting, and placement are important too. Remember, it is the metal mass directly under the antenna, not what's along side, that counts. And a ground strap is not a replacement for proper mounting!

    now this may seem to support the need for bonding everything as he goes into in detail but when you end up with thinking that bonding produces a balanced system, you can get caught up into going into the wrong direction.

    it is the same with the idea of a counterpoise, no such thing in a mobile application because the purpose of one is lost s thanks to the relationship between the earth as did vehicle, make sense?
     
    Meteorgray Thanks this.
  9. craig_sez

    craig_sez Road Train Member

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    Its ot a perfect solution but its the best of a bad one..
    Cant mount an antenna on a fibreglass hood/roof thats already #### near 13'6",trucks are spot welded and bolted with plastic bushings n glue so with todays truck we just do what we can to help..
    Not seen a better solution yet..
    I have considered metal tapeing the fibreglass roof,considered a dipole running side to side on the back side of roof flairing but those ideas were shot down..
    Got a better idea??
    Hell even the few bond straps to my door to cab have seemed to help,gonna try some more on the outer skins of the truck and a cpl from chassie to engine block..
     
  10. Ridgeline

    Ridgeline Road Train Member

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    Not saying not to do this but to start with the cab, the sleeper isn’t where the issues are.
     
  11. craig_sez

    craig_sez Road Train Member

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    My point of the vid was just to show its not all that well put together..Already started with the cab by doin my door to cab..
     
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