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HF Noise in Toyota Camry
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by N7LMJ on April 5, 2005
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I just installed an Icom 706 and AH4 tuner into my 1998 Toyota Camry. I'm 99% sure that my fuel pump is causing the S7-s8 noise level I get on all the HF bands.
I installed the radio and tuner in the trunk. The radio is on the strut tower and the tuner is under the rear window deck between the hi-fi speakers. I've grounded the tuner and the radio to the "frame" such as it is, with a #10 wire. The antenna is on a trunk lip mount and is a 102" steel whip.
Has anyone solved the noise problem like that? It comes on when the key is on. Doesn't make much difference if the engine is running or not. Works great when the key is off.
Thanks!
73 de Mike, N7LMJ
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RE: HF Noise in Toyota Camry
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by WA2VNV on April 5, 2005
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Mail this to a friend!
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I don't think its your fuel pump. Check to see if the noise starts as soon as you put in the key - don't turn it to acc or run/start, just insert the key. In this step, your fuel pump isn't running. To do this you rig must be powered directly from the battery or some other constant (external)12 volt source so you don't have to turn the key on.
I've had a similar(maybe)problem with my 2000 Toyota Avalon since I put in a '706mkg in 2003. However, I have no noise on the HF bands, my noise (sort of multiple buzzing birdies on am/fm/ssb across the bands) on the VHF 2M band, much less on 448 MHz. My radio is mounted under the drivers seat with remote head on the dash. I use single band ham sticks on HF and a roof mounted dual band gain ant for 146/448 MHz. All well grounded. I have Ferrite (clip around) beads on all power, remote, & both antenna leads. Radio chassis is grounded with short 6 inch braid directly to car chassis. Power leads directly to battery (fused). Noise is radiated (NOT conducted) because when I disconnect the ant, it goes away.
After much signal tracing with a small 3 in dia loop, I traced the source to the (of all strange places) driver side door window/door lock switch panel! Carefully removed the panel and inside (under a cover) is a PC board with 2 or 3 microprocessors and some 3 & 8 MHz ceramic xtal resonators for the clocks - all SMD chips. It seems there is a multiplexed communications system bus for controling everything all around the vehicle. I added clip on ferrites around all leads inside the door, Alum foil wrap around shielding, conductive shield paint on plastic body - all no help. It helped a little, but there is another smaller source inside dash near left kick panel fuse box. Veeerrry frustrating, to say the least. I've sort of worked on the problem on & off for past 2 years and not made much progress. I tried usual postings on radio boards, contacted Toyota, etc for any info on similar problems and have sort of learned to live with it using PL receive squelch on the repeater channels. I hope all this is some help to you is searching for your problem(s). Let me know what you find. Good Luck!
George
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