[Icom] RE: M obile Noise Supression Help Needed

Wed, 21 Aug 2002 17:31:17 -0600

Hi, JV
WRX has this problem. It is well known on the Subaru NG.
73,
Tony, VE6CGX

JV wrote:

> Hi Tony
>         Where did you get this information? I had two Subaru cars and 
> no problems with ground, engine problems or any thing else on either. 
> I ran an IC-735 and VHF/UHF rigs in both. I put over 100,000 miles on 
> each. Just curious.
> JV
>
> At 01:59 PM 8/21/2002 -0600, you wrote:
>
>> Hi,
>> One maybe  related topic, on some Subaru cars, poor grounding is 
>> known to cause poor engine performance.
>> 73,
>> Tony, VE6CGX
>>
>>
>> Dick Flanagan wrote:
>>
>>> At 06:27 AM 8/21/2002, Denis G. Barton wrote:
>>> >Dick, what did you use to hold the RG-8 shield to the tail pipe?
>>>
>>> I cut the braid to length and crimped an uninsulated lug on each end.
>>> I then attached each end with a #8-3/8" self-drilling sheet metal 
>>> screw with external-toothed lock washer.  Alternatively, take your 
>>> car and the shield to a muffler shop and they will be happy to 
>>> tack-weld each end to the frame and pipe.
>>>
>>> Whenever I have a noise problem, I actually make up a dozen or so of 
>>> these lugged shields and go around the car with my electric drill 
>>> and bond every distinct panel to the body, frame or its adjacent 
>>> neighbor:  hood, doors, fenders, side panels.  I also make it a 
>>> point to crawl under the car and make sure the body is bonded to the 
>>> frame in at least two locations.
>>>
>>> But do the tail pipe first.  I can't speak for any vehicles other 
>>> than my own, but this has always eliminated 80-90% of any ignition 
>>> noise I was experiencing.
>>>
>>> This does NOTHING for RF feedback or charging system noise 
>>> ("alternator whine"), each of which require different methods.  My 
>>> personal rule of thumb (I do a lot of mobile operating) is when I 
>>> install a radio I am careful to ground the radio where it is 
>>> mounted, run separately-fused power cables directly to the battery 
>>> and ground the tail pipe.  Only if I then experience noise do I take 
>>> further steps.
>>>
>>> So far on both of my current mobile IC-706s (this is the ICOM 
>>> reflector, after all), when I am monitoring 75 meters I can't tell 
>>> whether my engine is running or not.  They are currently installed 
>>> in an old 86 Ford F-150 (aka pickup truck with Magnecor wires and 
>>> full bonding) and a year-old Chevy Tahoe (aka Suburban with tail 
>>> pipe bonding only).
>>>
>>> If anyone would like any additional generic non-ICOM-specific help, 
>>> please contact me directly at [email protected] or join the 
>>> [email protected] reflector.
>>>
>>> 73, Dick
>>> -- 
>>> Dick Flanagan W6OLD OOTC CFII Minden, Nevada
>>> Visit http://www.cvrc.net
>>>
>>>
>>> ----
>>> Your Moderator: Dick Flanagan W6OLD, [email protected]
>>> Icom FAQ: http://www.qsl.net/icom/
>>
>>
>>
>> ----
>> Your Moderator: Dick Flanagan W6OLD, [email protected]
>> Icom FAQ: http://www.qsl.net/icom/
>
>
> ----
> Your Moderator: Dick Flanagan W6OLD, [email protected]
> Icom FAQ: http://www.qsl.net/icom/
>