This is a somewhat broad statement, but, most manufacturers (Chrysler , Ford
and Toyota) are okay with anything up to 100 Po.
As for your grief on 40, seems typical band where most headaches occur. the
lower in frequency you go the worse it gets.
My input on this ,
Gary...wa6fgi
>________________________________
> From: Ray <w4byg@att.net>
>To: rfi@contesting.com
>Sent: Tuesday, April 17, 2012 7:37 AM
>Subject: Re: [RFI] RFI issues in Toyota 4Runner
>
>I have a 2006 4Runner that works fine with my FT-100 running barefoot on
>any band. The HF antenna is a base matched 400 watt Hustler, mounted on
>the car top carrier frame. The HF mount is exterior grounded to the
>roof at the frame mounting bolt. The coax has about two feet of #43
>ferrite cores installed over it on both ends of the coax to absorb any
>RF coming back down the coax. The system works very well on 20 meters
>and up, as I compete nicely with fixed stations for DX.
>
>I also have an FT-7800 with an MFJ 150 watt amp on 2 meters. The VHF
>antenna is mounted in the center of the roof on a magnet mount. Both
>exciters are powered thru a TGE voltage regulator. All works well in
>this configuration.
>
>However I also have a Ameritron 500 watt HF amp installed on the back
>deck. It is powered by two healthy gel cell batteries mounted there
>They are kept charged thru a heavy #4 (fused both ends), wire run
>underneath the body and connected directly to the car battery. The car
>body is the return. There is very little voltage drop on 70 to 80 amp
>voice peaks. The FT-100 with the Ameritron amplifier at full power
>work well on 10,15 and 20 meters.
>
>My problem: on 40 meters with the amplifier on, an oxygen sensor trips
>an alarm to the Toyota computer which puts the car into a protected
>running state, where it will not go any faster than about 35 miles an hour.
>
>I can easily clear the fault with a code scanner. This indicates there
>is no permanent damage. Once again running at 100 watts proves OK, but
>I have been unable to resolve how prevent the 500 watts of RF from
>getting to the oxygen sensor and/or computer on 40 meters.
>
>Does anyone have any experience that would be helpful here?
>
>Your attention is appreciated.
>Ray, W4BYG
>
>
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