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Thread: Integrated antenna

  1. #1
    Newbie
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    May 2010
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    Integrated antenna

    I have a VW caravelle with the antenna integrated in the windsheild.

    And when the p2140 starts the radio blurs out. The signal seems to wipe away by the p2140.

    Is there anything i could do to shield it or something?
    Or should i get a roof antenna if i want to have the radio and the p2140 running at the sam time.

    regards
    Bruno

  2. #2
    Newbie
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    Colorful Colorado
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    ::BUMP:: for a similar issue.

  3. #3
    Newbie piglith's Avatar
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    May 2008
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    Good ground, Isolated +12 line to the 2140.

  4. #4
    Newbie
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    Dec 2007
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    Tried that. Grounded to chassis and/or battery. Oversized power feed lines direct from battery. These three things helped to a small extent, but did not quash the RFI.

    Ferrite beads on all inbound and outbound lines for the PSU didn't seem to help a bunch either.

    My guess would be that the CNX is doing some high-speed switching that is based around 150mhz and that is what is generating the RFI.

    It could be that the way my power cables were ran were an issue, however I still saw the problem when I was using a small lead-acid battery to power the CNX next to it insted of from the main battery in the truck.

  5. #5
    Raw Wave
    Join Date
    Nov 2009
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    Antenna ground should be to the body, not battery - ie, groundplane. (But RF amps should be power-grounded to the battery...)

    And converter power switching is (should be!) sub-MHz - no where near 150Mhz.
    Not that that means there is no 150Mhz noise, but it's probably at a lower frequency maybe IFs (455k; 10.7M etc).

    I'm tempted to suggest small caps for such high frequencies (else in-line beads), but after a recent problem that proved to be a ground loop...

  6. #6
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    Forgive me if I was unclear. I tried grounding the PSU to the battery direct, to chassis very close to PSU and both at the same time.

    As for the switching speed, I am curious what is actually being done. I will note the radio is not of the best quality so I cannot exactly rule out that the interference is messing with the IF or if its making it past the Freq-Mixer.

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