[OZAPRS] Bad HF noises in Landcruiser ??

[Ray Wells]

My 60 series was very quiet but a neighbours 60 series a few years early 
had full scale hash on 27MHz from the oil pressure sender. The engine 
was alive with noise.

We bonded the body to the chasis at the front rubber body mounts with 
heavy braid and the noise disappeared completely.

My old 24v 1981 MQ Patrol had S9+ on 2m from the mechanical voltage 
regulator. It defied all attempts to quieten it, except one. I built a 
solid state regulator and goodbye noise.

Ray vk2tv


On 11/07/10 15:37, Nic McLean wrote:
>
> I have found 2 huge sources of noise in landcruisers to be the 
> alternator and the oil pressure sender. To prove how much of the noise 
> is oil pressure sender temporarily disconnect the sender. I have 
> knocked down the alternator whine by fitting a MAR-60A in line. If you 
> fit a 47 nF cap across the oil pressure sender it will reduce the 
> noise it makes and will also reduce the oil pressure gauge reading by 
> 10 to 20 % (I can mentally add the reduction).
>
> Best 73's
>
> Nic
>
> VK2KXN / VK5ZAT
>
> 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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