[OZAPRS] Bad HF noises in Landcruiser ??

[Michael Wain]

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__interference.htm


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


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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. 

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Yours sincerely



Michael Wain - VK3HAU


EGARC Inc. Publicity Officer.

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



  ----- Original Message ----- 
  From: Geoff 
  To: 'Australian APRS 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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