[OZAPRS] Bad HF noises in Landcruiser ??

[Geoff]

There's no variation with engine revs, (not like an altenator whine) - there
is a very low level (barely audible) ticking that does seem to speed up
slightly with the rpm.  This one's not a common-rail engine.  on reading
about common-rail issues the problem there is a high noise level across the
board.. in my situation I have no noise at all - beautiful conditions
everywhere except on these annoying spot-frequencies 

 

The Oil sender issue looks interesting - I'll take a look where that cabling
goes and see about shielding it.  see what that does (saw another post there
about replacing the sender cable with a coax and earthing the shield).

 

Regards,

Geoff

 

 

 

From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] On
Behalf Of Michael Wain
Sent: Sunday, 11 July 2010 1:57 PM
To: Australian APRS Users
Subject: Re: [OZAPRS] Bad HF noises in Landcruiser ??

 

is it rev related e.g. alternator revving up and down or is it a constant
freq ?

 

could be cpu, could be fuel pump, could be fuel injectors, could be oil
sender. doing a quick Google pulled these WebPages , have a look.

 

 

http://www.amalgamate2000.com/radio-hobbies/radio/common_rail_diesel__interf
erence.htm

 

 

from chipboy on the overlander 4wd forum,
http://forums.overlander.com.au/viewtopic.php?t=41098
<http://forums.overlander.com.au/viewtopic.php?t=41098&start=0&postdays=0&po
storder=asc&highlight=&sid=e8ebef4009204a73da498a5f2a4f4802>
&start=0&postdays=0&postorder=asc&highlight=&sid=e8ebef4009204a73da498a5f2a4
f4802 

 

 

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Rerun the oil sender wire using some thin coax and use the centre wire for
the sender, earth the outer at both ends and hey presto no noise. 
Might try some suppressors on it too. Just an idea! 


Matt 


geexel wrote:


This is a fact. 

It is caused by the oil pressure sender to the guage in the instrument
cluster on the dash. 
The remedy is to run the wire through a switch on the dash and when you are
on the trot and want to use the HF, break the circuit through the switch on
the dash, ensuring that you turn it back on especially during those times
when the engine is working hard in rough country.

____________________________________________________________________________
____________________________________________________________________________
____________________

 

 

 

 

 

Yours sincerely



Michael Wain - VK3HAU


EGARC Inc. Publicity Officer.

Ph : 613 - 51411650
Email - vk3hau at vk3egc.org
Web -  <http://www.vk3egc.org/> http://www.vk3egc.org 

<>

----- Original Message ----- 

From: Geoff <mailto:geoff at gatwards.org>  

To: 'Australian APRS <mailto:ozaprs at aprs.net.au>  Users' 

Sent: Sunday, July 11, 2010 12:19 PM

Subject: [OZAPRS] Bad HF noises in Landcruiser ??

 

Guys,

 

A little OT, but perhaps you know the answer J

 

Got my HF setup in the vehicle installed and operational during the week -
IC706 (Original Mk1) in a 100 Series Diesel Landcruiser (No Turbo).

All working great, tunes up on all bands 80m through to 10m with zero
noise..   EXCEPT...

 

When the engine is running I get an awful 1-2kHz squeal in a few spots on
40m (thankfully most of the 7xx0 and 7xx5 freqs are free from this problem
and quite usable).  The problem is also there on 30m and 20m, the noise
takes out 10.147 and 14.116 - two freqs I'd like to be able to access - but
by far the worst is on 40m.

 

I can probably live with it on 30 and 20m (call into the travelers net
whilst pulled over for a break, and APRS can get away with degraded Rx), but
it's really annoying when tuning around on 40m whilst mobile.

 

Anyone with a Diesel Landcruiser 100 had/solved this issue ??

 

Cheers,

Geoff   VK2XJG

 

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