[Icom] Mobile Noise - Good News and Bad News

[Sheldon Daitch]

Doug,

Tongue in cheek mode now.  Looks like you need to
buy one of those analyzers and keep it hooked up.

Seriously, tho, could you run the vehicle with the
analyzer hooked up?  Perhaps the cable that goes
to the analyzer port is the source of radiated 
noise.

73
Sheldon
WA4MZZ



"Davies, Doug A FOR:EX" wrote:
> 
> Did some things last night and I've got some good news and some bad news.
> First the bad news.
> 
> I planned to try shielding the computer with aluminum foil to see if I could
> get any reduction in the noise.  Took out the glove compartment to get at
> the computer and discovered that it is housed in a very sturdy metal box
> already.  Not much chance of noise getting out of there.  I ran an
> additional ground strap from the box to the firewall just to be sure but it
> made no difference at all in the noise.  So much for that.
> 
> Now the good news.  On the way home from work, I took another chance and
> stopped in at my Toyota dealer and asked again if they would PLEASE help me
> find the source of this noise.  Well, their senior mechanic must have had
> pity on me.  Even though he was just getting off work, he went to his tool
> box and pulled out some sort of analyzer.  He plugged this into a port under
> the dash and said he could perform all sorts of diagnostics right from the
> analyzer.  First, without the engine running, he turned on the fuel pump.  I
> had the 706 on and could hear a very faint increase in background noise but
> nothing that would be a "show stopper".  He then turned on other stuff while
> I listened on the radio.  Nothing he did made the now famous noise.  He then
> disconnected the analyzer, I started the truck and VOILA, the noise was
> there...solid S-7.  The mechanic had no explanation of what could be causing
> it.  So, I guess it wasn't all good news after all.  However, I have revised
> my opinion of the Toyota service department so I guess that's the good part.
> 
> Doug  VA7DD
> ----
>