HF noise from Turbo Disel

Submitted: Tuesday, May 22, 2007 at 21:48
ThreadID: 45768 Views:3636 Replies:9 FollowUps:14
This Thread has been Archived
Hi all, I have just purchased a new Landcruiser 79 series turbo diesel we have just returned from a simpson desert trip and found that there was a lot of noise on the Hf generated from the vechicle when running, no noise when off never had this problem in the two previous standard diesel Landcruisers the HF was fitted to.
When I was along side the vehicle travelling with us a LC 100 series std diesel with a Codan NGT fitted same noise appeared in there set when I turned engine off noise disappeared. Does anyone have any answers to fix problem ???
Also my Waeco fridge is causing slight interferance as well, didn't in my Stnd diesel?
Thanks barry
Back Expand Un-Read 0 Moderator

Reply By: Footloose - Tuesday, May 22, 2007 at 22:11

Tuesday, May 22, 2007 at 22:11
Hi Barry, try this Site Link
Murrays a mate of mine.
Also the Yahoo Codan group can be helpful with c/r diesel interference.

AnswerID: 241725

Follow Up By: Barry 2 - Tuesday, May 22, 2007 at 22:48

Tuesday, May 22, 2007 at 22:48
Thanks footloose I will look at the earthing suggestions at the beginning but by the end I had no idea what he was doing ???
I'll check out the codan group
Thanks again
Barry
0
FollowupID: 502676

Follow Up By: Footloose - Tuesday, May 22, 2007 at 22:51

Tuesday, May 22, 2007 at 22:51
Barry, I suppose it could be a bit difficult to take it all in at first. Basically he shielded the brain, and put torroids inline with its blood supply :))
0
FollowupID: 502682

Reply By: disco1942 - Tuesday, May 22, 2007 at 22:17

Tuesday, May 22, 2007 at 22:17
We occasionally got this problem back in the days when I was fitting two-way radios. All the usual engine suppression (petrol motors) failed to eliminate the problem. It turned out to be statics in the exhaust system. This happens in piston engines in aircraft as well.

Get some coper braid - the outer conductor from co-axial cable will do. Attach one end to the end of the exhaust pipe with a hose clamp and and the other end to a good earth on the body or chassis.

PeterD
PeterD
Retired radio and electronics technician

Lifetime Member
My Profile  Send Message

AnswerID: 241730

Follow Up By: Barry 2 - Tuesday, May 22, 2007 at 22:50

Tuesday, May 22, 2007 at 22:50
Thanks peter I'll give it a go
Cheers
Barry
0
FollowupID: 502679

Reply By: SteveL - Tuesday, May 22, 2007 at 22:17

Tuesday, May 22, 2007 at 22:17
I have read about such problems with electronic diesels on amateur radio websites and the cures they have come up with.It usually involves ferrite chokes
amongst other things.
AnswerID: 241731

Follow Up By: Barry 2 - Tuesday, May 22, 2007 at 22:50

Tuesday, May 22, 2007 at 22:50
Thanks Steve
0
FollowupID: 502681

Reply By: Member - Phil G (SA) - Tuesday, May 22, 2007 at 22:30

Tuesday, May 22, 2007 at 22:30
I assume you've got the new V8. It was a well recognised problem on the 1HD-FTE in both the 100series and 78/9 series. Mine was unusable when mobile, having been previously fine on the TD Prado.

I went around with a multimeter and ended up putting earth leads on both fuel tank covers and the rear end of the exhaust. I sought advice from Electric Bug in Adelaide, and he had nothing further to advise, apart from adding a noise-reducing speaker. So I bit the bullet, spent over $300 on one and I've been happy with the way it works. It has 3 levels of noise reduction, and the first level is all I use - if I move to 2nd land 3rd level it cuts out the voices. I use it on noise reduction all the time - even when stationary.
AnswerID: 241734

Follow Up By: Richard Kovac - Tuesday, May 22, 2007 at 22:48

Tuesday, May 22, 2007 at 22:48
come on Phil,,, some part numbers, and where to buy it,, mines hopless unless doing around 25-30Km..???

Come to think of it thats got nothing to do with RPM of the engine only other moving parts,, mmm will have to think about that ... lol

Richard

Part numbers>>>>>
0
FollowupID: 502674

Follow Up By: Footloose - Tuesday, May 22, 2007 at 22:53

Tuesday, May 22, 2007 at 22:53
Phil, I'd rather start by getting rid of the noise , rather than learning to live with it by using filters.
0
FollowupID: 502684

Follow Up By: Barry 2 - Tuesday, May 22, 2007 at 22:57

Tuesday, May 22, 2007 at 22:57
No Phil, just the 4.2 turbo not V8
Thanks for your help
Barry
0
FollowupID: 502688

Follow Up By: Member - lyndon K (SA) - Tuesday, May 22, 2007 at 23:00

Tuesday, May 22, 2007 at 23:00
Hey Phil,
Can't seem to contact you direct but would love to get to know more about the HF noise, we are having a Ngt fitted by E,Bug in Adelaide soon & would rather get it right the first time. Were you happy with the service there??
Cheers Lyndon & Bernadette
Now is the only time you own
Decide now what you will,
Place faith not in tomorrow
For the clock may then be still

Member
My Profile  My Position  Send Message

0
FollowupID: 502691

Follow Up By: Member - Phil G (SA) - Tuesday, May 22, 2007 at 23:18

Tuesday, May 22, 2007 at 23:18
Richard,
Its made by SGC in the USA - ADSP2. I don't have a model number. Here a linkto a very similar speaker with the same specs
and heres a picture


Sold by Electric Bug in Adelaide.
0
FollowupID: 502696

Follow Up By: Member - Phil G (SA) - Tuesday, May 22, 2007 at 23:25

Tuesday, May 22, 2007 at 23:25
Footy,
I'd agree with you 100%, but having done the reading incl the Codan and LCOOL Groups, and taken the advice of a good friend in Adelaide who's very technical with HF, I still had no idea what I should be doing apart from the earthing. There seemed to be a thousand other ideas out there on how to attenuate the noise (a little).

Won't catch me touching the ECU on my Cruiser - likely to turn it into the electronics of a LandRover :-))

So when all else fails - the idea of a plug in solution had its appeal!
0
FollowupID: 502698

Follow Up By: Footloose - Tuesday, May 22, 2007 at 23:31

Tuesday, May 22, 2007 at 23:31
Phil, I can understand that.
But I'm the guy who took a Waeco apart to get rid of the noise it made, I'd probably take a new V8 diesel apart also if it meant getting the radio to work.
0
FollowupID: 502699

Follow Up By: Member - Phil G (SA) - Tuesday, May 22, 2007 at 23:35

Tuesday, May 22, 2007 at 23:35
Lyndon,
I've bought all my radio and GPS stuff from Electric Bug - usually 4wd show specials. The advice that Phil Pullem gives has always been spot on, so I support his business. I bought my Barrett there, but wanted to fit it myself - he spent half an hour with me telling me the best way to install it. He gave free lessons on how to use HF - that got me started. I'm still a mug when it comes to HF, but like to listen in to VKS to hear whats happening around me, and I use the radio to phone home when we're away through Bushphone at Cowra.

I don't understand the LandCruiser noise issue. The motor is not Common Rail. I'd suggest you see what its like with your NGT - doesn't it have noise suppression built in?? If so, you may not have much of a problem.
0
FollowupID: 502700

Follow Up By: anglepole - Thursday, May 24, 2007 at 09:59

Thursday, May 24, 2007 at 09:59
Hi Guys,

TTS in Melbourne have these Speakers on Special at the moment, Google TTS and find them.

I purchased one from them a while ago they posted it to me in Adelaide the day after they received my order. Excellent to do business with, and much cheaper than Ebug at the time.

Despite lots of advice getting rid of RF noise in vehicles it is a "black art" and can be very time consuming.

With out a doubt bonding is one of the simplest and effective places to start. It also has the advantage of lowering "Ground Resistance" enabling more power to be radiated.

Good Luck
0
FollowupID: 503003

Reply By: Footloose - Tuesday, May 22, 2007 at 22:37

Tuesday, May 22, 2007 at 22:37
If you follow the link you'll find that its not just a matter of earthing. The relatively high switching voltage around the ecu and injectors point to shielding and suppression in addition to the normal earthing needs.
AnswerID: 241739

Reply By: Member - Doug T (W.A) - Tuesday, May 22, 2007 at 23:17

Tuesday, May 22, 2007 at 23:17
Barry
my fridge also creates noises that sound like noises from a distant Galaxy too , I overcome that by fitting a switch on the roof console so when I want to use the radio for the Sked I just turn it off, Forgot to turn it back on once and the bloody T Bones thawed out a bit ,\As for the engine noise , yes I get it too , 75 series
gift by Daughter

Lifetime Member
My Profile  My Blog  Send Message

AnswerID: 241753

Reply By: traveller2 - Wednesday, May 23, 2007 at 08:24

Wednesday, May 23, 2007 at 08:24
Having fitted HF's for a crust a while back (stopped about 6 years ago) the biggest source of noise on diesel cruisers is the sender for the oil gauge. LHS of the engine you will see what looks like a little tin can with a wire connected to the centre terminal, some have an earth terminal as well. Connect a 1 uF capacitor between the two terminals or between the centre terminal and the case.
I used to solder them to the terminals and insulate/stick the cap to the side with silicone to secure it.
Everything else electrical will cause noise as well, we used to turn everything off, pull up and stop the engine if a selcall came in.
GPS CPU's also cause interference as do inverters, laptops and reversing screens.
Make sure that the bonnet (across the hinges), doors (hinges also)and the exhaust system are also earthed with braid, the latter at the front, centre and rear to prevent static buildup.
AnswerID: 241790

Reply By: obee - Wednesday, May 23, 2007 at 17:37

Wednesday, May 23, 2007 at 17:37
Attenuating noise will attenuate the signal which you dont want. There is a trick used by some involving an am radio tuned off channel and short antenna wire and go around the engine bay looking for the noise source. If you cant find a way to stop the noise look to fitting the antenna to the rear of the vehicle. I had to do this on an old Hilux I owned.

Owen
AnswerID: 241877

Reply By: Barry 2 - Wednesday, May 23, 2007 at 20:35

Wednesday, May 23, 2007 at 20:35
Thanks for all your replys they are appreciated
I will start with the earthing and see where that takes me
Cheers
Barry
AnswerID: 241926

Follow Up By: Olcoolone (SA) - Friday, May 25, 2007 at 00:11

Friday, May 25, 2007 at 00:11
The noise is coming from the injection system on the D4D engine and you can do very little to stop it.

With some newer vehicles getting alternator whine, this is caused by higher alternator outputs, as the current increases in a 12 volt system (it happens in all voltage applications) the signal get dirty.

This is why they were talking about 42 volt systems for automotive because they can keep the signal noise down.

Regards Richard
0
FollowupID: 503188

Sponsored Links