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Offline DaveMac

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Radio Interference
« on: October 19, 2007, 16:10:21 »
Hi All,
New to forum, my first post.
Disco TD5 2001.
I love my Diisco but am having big probs with interference when using my amateur radio istallation.
I suspect noise is being radiated from the injector circuitry.
Any of you good folk out there found (and hopefully solved) this problem?
The noise is definately coming through the antenna, mounted on the spare wheel carrier, and is not coming through power leads etc.

Would appreciate any advice on a possible cure. (No, I do not want to fit a V8 lump!!!)

Cheers
Dave
de GM8UPI
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Offline GREENI

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Radio Interference
« Reply #1 on: October 19, 2007, 16:37:06 »
I thought being a HAM, you should tell us about emc/rf etc :oops:

Wait 'til the water ingress ruins your Yaesu !!!

Sorry, don't know how to solve your problem, always run Icom/Yaesu in my Defender but never had any problems :?
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Offline Evilgoat

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Re: Radio Interference
« Reply #2 on: October 19, 2007, 16:40:23 »
Quote from: "DaveMcAlpin"
Hi All,
New to forum, my first post.
Disco TD5 2001.
I love my Diisco but am having big probs with interference when using my amateur radio istallation.
I suspect noise is being radiated from the injector circuitry.
Any of you good folk out there found (and hopefully solved) this problem?
The noise is definately coming through the antenna, mounted on the spare wheel carrier, and is not coming through power leads etc.

Would appreciate any advice on a possible cure. (No, I do not want to fit a V8 lump!!!)

Cheers
Dave
de GM8UPI


Where is your radion in relation to the ECU. The car will have had to pass emissions tests for type approval so I would suspect something isnt right. I'm not seeing any interference from the Bosh system on the Audi or Suzukis system (Nippon Denso I think)

Thats 140Mhz - 180Mhz
27MHz CB Standard
27MHZ CB Mids
TV Bands
470MHz Airwave/TETRA

Check earths etc, might even want to try a scanner with a tiny little sub ant to pin it down to a compnent.

Niel may be able to help.
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Offline DaveMac

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Radio Interference
« Reply #3 on: October 20, 2007, 00:20:07 »
Hi,
Thanks for replies.
Interference seems to be coming from ECU unit and/or injector valve pulse circuitry, airborne radiation and coming in via antenna.
Tomorrow, weather permitting, I'll try earth bonding straps on ECU, bonnet lid and rear door.

Warch this space!!!
No one out there had this problen on TD5 Disco!!!  (Problem worst on 80 & 40 mtr bands) Must be other "hams" out there running Disco diesels!!

Cheers
Dave
de GM8UPI
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Offline lurch_917

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interferance
« Reply #4 on: October 22, 2007, 08:00:05 »
check the suppresor on the back of the alternator
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Offline piper5

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Radio Interference
« Reply #5 on: October 26, 2007, 22:51:35 »
hi dave what radio are you running i had same problem with my yaesu 857/atas setup, it was unuseable on hf i had power straight to battery with ferrites everywhere, lost the plot and put my icom dual bander in no probs,i have asked various raynet people etc to no avail, i have put it aside as a winter project, worryingly the one comment i have had several times is buy an icom!, let me know how you get on or if you want some help i am just over the bridge in west fife.
one thought i did have is there is a radio transmitter in the roof between the sunroof positions for the alarm. which has known interference problems , i have changed mine to the modded one to no avail.
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Offline DaveMac

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Radio Interference
« Reply #6 on: October 27, 2007, 16:34:25 »
Hi piper5,
Yup, problem with FT857 and Atas120. Antenna mounted on rear wheel carrier. Tried other antennas, Hustler, Pro-Am etc. Interference still the same. OK on VHF, UHF and higher HF bands, but very bad on 40mtrs.
Substituting DL for antenna, clears all noise. Interference is radiated, and not coming through power leads etc.
Seems source is injector firing/ECU generated.
Near to giving up 40mtr /M.
Any suggestions?
Dave
de GM8UPI
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Offline andycwb

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Radio Interference
« Reply #7 on: October 27, 2007, 18:51:55 »
Quote from: "GREENI"
I thought being a HAM, you should tell us about emc/rf etc :oops:

Wait 'til the water ingress ruins your Yaesu !!!

Sorry, don't know how to solve your problem, always run Icom/Yaesu in my Defender but never had any problems :?


I sent Dave over here from a Ham radio message board.....  Welcome to Mud Club!
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Offline piper5

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Radio Interference
« Reply #8 on: November 07, 2007, 21:08:46 »
dave did you get anywhere with this yet?
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Offline DaveMac

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Disco TD5 RF Noise
« Reply #9 on: November 07, 2007, 21:26:47 »
Quote from: "piper5"
dave did you get anywhere with this yet?


Not solve problem yet. Have tried cheapo ferrites (Maplin) on injector loom, but these only made a very slight reduction. (Since found out these are almost useless for this application!!!)
Have now ordered the correct ferrites, from another source, for suppression of 1 - 100Mhz interference. Hope to be trying these this weekend, subject to post delivery!
 Watch this space. I will post results.

Cheers
Dave
de GM8UPI
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