Rodger,
Although I have no experience with your make/model, I did have problems
many years ago in a van when bonding leads that I had installed on the
exhaust pipe deteriorated over a period of about two years and broke off.
That resulted in a significant increase in ignition noise. Your car is
around 2 to 3 years old, so it occurs to me that maybe something that was
properly bonded (or shielded) when the car was new no longer has a good
bond to chassis or a shield. Also, some component(s) may have failed or
changed value - good luck on that.
A suggestion for locating the noise maker: construct a sniffer loop out
of a turn or two of insulated wire and a coax connector. Connect that
sniffer to your IC-706 (tuned to whichever band produces the loudest
noise) and move the probe (with care!) around the engine compartment to
see if you can find where the highest noise levels are located. Don't
forget to sniff around the exhaust pipe, as well. (Since most exhaust
pipes are solidly attached to the engine but are "floated" on hangers to
isolate mechanical noise, they make excellent end-fed antennas for
ignition harmonics.) You may need a helper if you can not set the radio
outside of the car while sniffing. While you are at it, disconnect all
antenna leads completely from the 706. Does the noise go away completely?
If not, you may be getting conducted noise on the 13.6 VDC power lead
into the radio.
Please infom us of what you find.
73, Dale
WA9ENA
ab0yw <ab0yw2006@gmail.com>
Sent by: rfi-bounces@contesting.com
08/08/2007 10:31 PM
To
rfi@contesting.com
cc
Subject
[RFI] RFI from 2005 Accord V6
I have a 2005 Accord V6. As of recently, I'm getting broad noise across
HF. In the past there was virtually no noticeable noise when the car was
running. Now I hear around S6-S7 (ICOM 706) at any RPM.
- There is no noise when the engine is off or when the ignition key is
in the on position (engine not running).
- The noise ramps up as RPM goes up.
- I had Honda check the engine for misfires or other anomalies and it
got a perfect check up.
- The engine has coils/caps on top of the valve covers. I've
unplugged each cap while listening to the radio and been unable to
detect
any change in the buzz.
- I've wiggled all wires going to ignition components and the
injectors without any noticeable difference.
- I've clamped a wire to the negative battery terminal and touched
other ground points to see if I could hear any difference to no avail.
Has anyone experienced something like this? Could it be the injectors?
Appreciate any tips.
73,
Rodger
AB0YW
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