HF Interference with DP Power Chip

[Monty Lurker Find all posts View Profile Close Monty]

I have just fitted a DP Powerchip to my Prada D4D 2008 and the extra performance is awesome. However, when transmitting with Codan NGT HF Radio there is a conflict with the DP Chip and he engine stops.Not nice. So far the fix has been to change it back to standard and try again , or only use the HF Radio when the engine is stopped. The experts are trying to resolve the problem. I will let the results be known. Would like to hear if others have a similar problem with these power chips

[Bushbasher Out of control poster! Find all posts View Profile Close Bushbasher]

Re: HF Interference with DP Power Chip

Try some form of shielding around the computer, like a foil blanket. We have similar problems with electronic equipment, including transmitters, fitted to some of our work vehicles - especially Commodores and Falcons. The feedback is usally from the dash electrics, including the aircon fans, back into the RF transmitter/receiver and not the other way round but you never know, it might work.

[clifton Advanced Member Find all posts View Profile Close clifton]

Re: HF Interference with DP Power Chip

I have just fitted a DP Powerchip to my Prada D4D 2008 and the extra performance is awesome. However, when transmitting with Codan NGT HF Radio there is a conflict with the DP Chip and he engine stops.Not nice. So far the fix has been to change it back to standard and try again , or only use the HF Radio when the engine is stopped. The experts are trying to resolve the problem. I will let the results be known. Would like to hear if others have a similar problem with these power chips

Hi Monty,
Contact the gang at RFI industries, had some HF RF shieldeing issues a while back and used a thin film mesh can't remember the name off hand but it worked OK.

[Guest Close Guest]

Re: HF Interference with DP Power Chip

Hi Monty,

If the problem only exists with the DP chip installed then the problem would appear to be a RF rejection
issue in the DP chip. The shielding as suggested by Bushbasher is a good idea though I would have thought the DP chip would
have reasonable suppression built into it to prevent what's happening.

You could also check the following to reduce the possibility of RF interference:

When you installed the HF did you use good RF practices, ie run the power cables for the radio
directly from the battery, and preferably locate the power cables and coax on the opposite side to
the engine managemnet and DP chip. Assuming the antenna is mounted on the rear door, did you run an earth braid from the
antenna base to good earth on the body side door hinge mount and then directly to a good earth on the chassis?

If the antenna is mounted on the bull bar did you run the coax and power cables on the opposite side of the car to where the dp
chip is located and locate the antenna on the opposite side, also again run an earth braid fromthe base of the
anntena to a good earth point on the chassis?

By good earth I mean scrapped the paint of till clean bright bare metal and then used some form of conductive grease?

Bottom line is best to keep radio power leads and antenna coax and antennas as far away from the cars electronics
as possible!

Cheers

LeighW

[Monty Lurker Find all posts View Profile Close Monty]

Re: HF Interference with DP Power Chip

Thanks LeighW, Have tried all as members and others have suggested and no good results. The engine stops dead in its tracks when transmitting on frequencies above 10 Meg. I also have fitted four RF chokes around the loom of the DP Chip and all that did was get rid of $48 for no result. I have not been able to find out where the shielding mesh comes from and would appreciate some help. The DP Chip people are being most helpful as well and if between all who helping me with this problem and have told me they will look after me if the problem cant be fixed.
Monty

[Monty Lurker Find all posts View Profile Close Monty]

Re: HF Interference with DP Power Chip

PROBLEM SOLVED!!!!!. After earthing everything includind door hinges, exhaust pipe, bonnet etc nothing helped the problem. After much research on internet shielding and earthing still seemed to be the answer. Off to Berrima Diesel with some copper shielding from LARGE coax cable to see if they could solve the problem. Finally after removing the spagetti from the DP Chip Loom and replacing it with the copper shield and earthing the copper shield to the earth wire in the DP Chip module and finally earthing all back to battery, problem solved. Thanks to those on PradoPoint who have offered their advise.
Monty. The people at Berrima Diesel are excellent to deal with

[Yota Advanced Member Find all posts View Profile Close Yota]

Re: HF Interference with DP Power Chip

Monty
good to see you solved the problem, the only problem ive had with my HF is if the cars not running, some frequencies set of the car alarm, very imbarising camped at Dalhousie Springs.

I think I spoke to you on HZoz from Silverton on our way to the gettogether this year

[vk2ss55 Senior Member Find all posts View Profile Close vk2ss55]

Re: HF Interference with DP Power Chip

Monty,
I think the same thing happened to me while transmitting on 7mHZ amateur radio band . The engine lost all power , it would idle but not rev up and the engine warning light was on . Stop the motor and restart and it came good with the light still on . The fault was "overpressure in the common rail" which the dealer reset ok for me . Was yours the same fault , if so how did you reset the warning light ?

Cheers

Ross