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Thread: Hirschmann antenna with capacitive ground?

  1. #1
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    Hirschmann antenna with capacitive ground?

    I have been chasing the poor FM reception since day 1. So far I rebuild antenna, replaced the antenna cable with new one, checked and confirmed that the antenna ground is solid, checked radio and tuner harness for good contacts. Basically all that can be done without serious repairs to the radio and tuner itself. I'm trying to rule out the antenna problem, which seems to be the most obvious case, before I decide to send both units for reconditioning and/or repairs as this route is expen$$$ive...
    Recently I came across the info that from '92 model year the antenna should have improved "capacitive" ground installed - kinda small metal fins attached to the upper tube and metal foil glued to the fender. Mine doesn't have the fins on antenna but I have the foil in place. WIS says that this should be used when interference exists in VHF range - this is my case. What is your experience with this improved type of grounding? Does it work at all? Is it worth of spending extra $$$? New part is NLA as far as I know but I may be able to source the parts antenna and recycle this fancy tube if needs be. Just checking before I start throwing any serious money into it.

    Here is the WIS page I'm referring to:

    82-8105.pdf

    And here is the picture:

    capacitive.jpg
    Last edited by darek_u; 07-13-2017 at 05:30 PM.
    _____________________
    1992 500E Porsche type 2758
    1988 Porsche 944 Turbo S

  2. The Following User Says Thank You to darek_u For This Useful Post:

    TerryA (07-14-2017)

  3. #2
    E500E Guru
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    Re: Hirschmann antenna with capacitive ground?

    I think you should put a new hirshman aftermarket antenna in the car and be done with it. Make sure you are properly grounded per the installation instructions.

    M

  4. The Following 3 Users Say Thank You to samiam44 For This Useful Post:

    gerryvz (07-14-2017), JC220 (07-14-2017), TerryA (07-14-2017)

  5. #3
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    Re: Hirschmann antenna with capacitive ground?

    I want to stay stock as far as possible. On a side note - new Hirschmann antennas are basically just the same as old AUTA models just with newest retracting system but still old fashion passive AM/FM antenna. I could be wrong here but even if I go to new replacement, have new antenna cable and proper grounding I may end up in the same situation - poor reception and noise. I'm trying to get as much as I can from what I have, that's why I'm asking for any experience with capacitive ground that Mercedes offered.
    Anyway, I have a feeling that it is a radio itself that needs refurbishing.
    _____________________
    1992 500E Porsche type 2758
    1988 Porsche 944 Turbo S

  6. The Following User Says Thank You to darek_u For This Useful Post:

    TerryA (07-14-2017)

  7. #4
    Member
    Join Date
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    Location
    Poland
    Posts
    60

    Re: Hirschmann antenna with capacitive ground?

    It turned out that my radio was bad - both FM tuner modules needed professional rebuild. Anyway, I also purchased the antenna tube with capacitive ground, I'll install it when time permits and report back improvements, if any...
    _____________________
    1992 500E Porsche type 2758
    1988 Porsche 944 Turbo S

  8. The Following 2 Users Say Thank You to darek_u For This Useful Post:

    gsxr (07-31-2017), TerryA (08-01-2017)

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