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Has anyone ever seen one of these?

Discussion in 'General CB Services Discussion' started by guitar_199, Oct 20, 2021.

  1. guitar_199

    guitar_199 Sr. Member

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    It is a Midland branded antenna matcher/tuner.
    Not that I really think it would be THAT useful since 11m antennas are typically monoband... and you can tune them to match well on their own .....

    I just like knowing about the equipment I have.
    It has no "model number" or anything else that identifies it......
    Any attempt I have made to search it up...... "nobody's home"!!!!!! It is like Google doesn't know these ever existed.



    20211017_183738.jpg
     

  2. Handy Andy

    Handy Andy Do Your Research First, Then Decide...

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    The "Ground Plane - Beam" switch has me curious - so I can understand the desire to know more.

    To me, the "Ground Plane" switch was for systems that had an antenna designed for 50 ohms Ω but wern't quite spot on due to issues with moisture rain wind or tuning out TVI...

    Same applies for "Beam" - the antenna on that kind of system would / could be resonate, but have an impedance bump requiring tuning into a 72 ~ 75 Ω load "appearance" and again a TVI issue.

    The Ground plane approach would be less focused on sharp tuning to cancel out reactive effects of proximity to trees, Other TV aerials - even RFI to other radios (tunable traps) while the "Beam" means what it says, this is for systems that are closer to Dipole operation and have a different impedance when at resonance - this can tune out the reactive effects by changing how "sharp" the tuning controls work with the coax connected to such a system.

    The only thing would be to remove the covers and it may answer the reason for the switch - but might not for whom the manufacturer is or possibly drum up any sort of documentation.

    These kinds of units are rare and even with Googles resources - is not always searchable.
     
  3. guitar_199

    guitar_199 Sr. Member

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    It definitely acts as an antenna switch. I neglected to show it.... not on the back are 3 SO239s...... transceiver, ground plane and beam. So the switch really does switch antennas but obviously does not allow for a beam with horizontal AND vertical polarization.

    Since it doesn't have any kind of band switch I am going to assume that it can only handle enough adjustment for something on 11m. I still wonder how much power it can take.

    Again... I really doubt that I would use it...I had just never seen one as a CB accessory.

     
  4. AudioShockwav

    AudioShockwav Extraterrestrial Admin
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    Is there any model number on the back?


    73
    Jeff
     
  5. NZ8N

    NZ8N Well-Known Member

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    You could hook up the Vertical of a dual polarized antenna (Moonraker IV, PDL II, etc...) to the GR Plane port and the Horizontal to the Beam port. It does not have to be a Vertical Ground Plane on the upper half of the switch. Could also relabel it too, or even fancier, re-silkscreen it.
     
    guitar_199 likes this.
  6. guitar_199

    guitar_199 Sr. Member

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    No sir. I have not opened it up..... but on the outside.... no.


     
  7. midnight special

    midnight special Sr. Member

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    looks like a gc electronics copy,,, the gc models name for fame was even if swr was good using the tuner helped eliminate tvi,,, this was when radios did 4 watts and tvs still used outside antennas or rabbit ears,,,,the added switch was to have one less jumper in line,,,,
     
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  8. barefootindian

    barefootindian Supporting Member

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    You could also try MIDLAND themselves. Their cb radios are very popular in the UK and also in ITALY.
     
  9. barefootindian

    barefootindian Supporting Member

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    guitar_199 the www address is midlandeurope.com but thats not a link to the address. They have a support section if you scroll down past the radio section. Hopefully you will be able to get any answers you seek from them.
    Hope this helps
     
  10. guitar_199

    guitar_199 Sr. Member

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    Thanks for that. I will look into it.

     
  11. AudioShockwav

    AudioShockwav Extraterrestrial Admin
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    Try

    https://midlandusa.com/pages/support

    Don't know if they will have anything on a piece that old but worth a try.
    73
    Jeff
     
  12. sunbulls

    sunbulls Sr. Member

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    IMO it’s a valuable project box because it’s metal. For starters I dislike rivets. Those would all be ground off and replaced with screws and star washers. I can’t say those cheap rockers that are seen in many CB antenna switches like that thrill me either. I can think of a few projects for that box, but I’m afraid most of them would be time consuming. For me, quality concerns regarding all things dealing with RF take precedence.
     

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