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Old 10-07-2010, 06:02 PM   #1
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Assistance needed with RFI on a HF radio

Hello All!

I've installed my Icom 706MkIIG radio in my 2003 Jeep Wrangler and I'm experiencing some awesome RFI! I'd like some suggestions on how to get rid of it.

Both the positive and negative power leads (factory supplied) are connected directly to the battery. The HF rig is under the driver's seat with the LDG Z-100 antenna tuner on top of the radio. The antenna tuner is grounded to the radio, which is then grounded to the chassis. The antenna is a 102" whip mounted to the right rear tail light with a ground wire running to the chassis.

I'm assuming that the RFI is ignition noise, as it increases in pitch and frequency of pulses as the engine RPM goes up.

Any suggestions?

Gigahertz
KB5ULK/7

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Old 10-07-2010, 08:31 PM   #2
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i am not familar with that radio. where can i get more info on it?

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Old 10-08-2010, 11:07 AM   #3
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Old 10-08-2010, 04:04 PM   #4
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Mr. Piper here: If you're confident the HF is properly installed with all furnished components, you should probably look into shielded ignition, specifically the plug wires and plugs. Shielded plugs have a different part number than non-shielded. High-performance plug wires are usually not shielded as well as stock, so if you've upgraded the wires you may need to go back or look at different wires.
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Old 10-08-2010, 05:18 PM   #5
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i would also look into a "noise" filter for the + lead.
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Old 10-09-2010, 01:14 PM   #6
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Try running just the positive lead to the battery and run all grounds to the chassis. Seems like the is a lot of extra grounding going on and (-) termination directly to the battery is not always the best solution. Maybe your creating ground loops and picking it up that way.

Allen
KF6QDE

P.S. Do you get the RF without the LDG Z-100 antenna tuner in the mix (i.e. have you tried tuning the whip w/o the Z-100 to see if you pick anything up that way)? Just spit balling here.
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Old 10-09-2010, 01:55 PM   #7
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@Piper54 - Thanks! Would you happen to have any recommendations as to where to get shielded plugs and wires? I asked at the local O'Reilly parts store and they looked at me like I had three heads.

@GREENMACHINE - I'll look into that! Thanks!

@AOR - I'll give it a try. It's easy enough to do/undo. Everything that I have been told and read say that you always want to run both power leads to the battery.

Thanks everyone! Keep the suggestions rolling until I can get this licked!

Dave
KB5ULK/7
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Old 10-09-2010, 02:02 PM   #8
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Also check this site Grounds, RF & DC for info on the issue. Seems to have good information. Also, are you running and external speaker and did you install the Ferrite bead as instructed in the manual?

The above site also has information on tracking down noise, as well as, proper installation of a choke.
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Old 10-09-2010, 02:06 PM   #9
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@AOR - Yess!!! I live on that site!! But a ferrite bead in the manual? I'll have to relook at my manual! I didn't see one. Thanks!
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Old 10-09-2010, 02:14 PM   #10
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It's next to the last page. I don't believe it will solve your issues but may minimize the annoyance of them while tracking it down. Let us know what you find out. May very well turn out to be an ignition system issue.

I have found so many sites this morning on this with great information on how to track it down, but DAMN, they're a lot of reading and theory. Keep up-to-date.

Oh! Here's a short one to consider. http://rx7.pw.cx/guides_manuals/coll...limination.pdf
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Old 10-09-2010, 02:40 PM   #11
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Ohhhh....on the external speaker. Sorry, I thought you were talking about the power lead. Ok...I'm on the same page as you. I'll take a look at your link. Thanks for your help!
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Old 10-09-2010, 03:30 PM   #12
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Update...AOR's link went to an magazine article from the ARRL. I followed the steps and figured out that what I am experiencing is transmitted interference. I couldn't hear the noise with the antenna disconnected and the engine on. With the antenna connected and the engine on, it is definitely there. This points to Radiated Noise. So...I'm back to the shielded wires option.
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Old 10-09-2010, 03:59 PM   #13
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nice! Progress in isolating a problem's solution always feels good.
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Old 10-12-2010, 03:53 PM   #14
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Take a look at hard grounding the exhaust system. Several suggestions in the past have lead to that as a prone problem area. A good braid from the rear most bracket to the chassis should provide a clean ground near the antenna site.
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Old 10-12-2010, 04:49 PM   #15
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I'd check the the ground bond on the hood also.
OK, you've narrowed it to how you are picking it up, now to find what is radiating.

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