Toyota hilux surf 3lt diesel

[M3IIW]

Hi all
I have a toyota hilux surfb 3lt diesel which is driving me round the bend whenn i try and use hf from the car.
I have a yaesu ft857d and when i key up the engine cuts ? i also have engine noise like bad plugs but its a diesel and i cant use hf at all the only time i can is when the engine it off.
i also have a friend who has the same problem with his toyota surf. which is doing our heads in trying to get rid of this noise.

Any help please.
Many thanks.
George 2E0GLW

[K0BG]

Welcome to the world of single-rail diesels!

Without some knowledge of the antennas in use, and how they're mounting, it is anyone's guess. I suspect the engine cutoff is due to common mode (poor antenna mounting scheme??).

I have to assume you all haven't done any bonding (hood, exhaust system, etc.), or other noise abatement procedures??

I worked with a G4 a couple of years ago, and got his Hilux down to about S2 without the NB on. I suspect this is about as low as you'll get, based on the injections system used.

So, how about some more information? Photos?

[M3IIW]

Hi Alan and thanks for the reply.
I am using a atas 120 i know not the best antanna in the world but i also use mono band antannas as well.
I have 2 mounts on the spare wheel frame,i also have used 1inch earth brade from the frame to the body and have also used earth brade to the exhaust to body.
I have even tried using coax as power cable but that did not work.
I have used a mag mount on the roof of the car again still the same problem.
I never had any problems when i had a pajero diesel.
I have been on your web site and have tried some things but still have problems.
I can only think its a new car or just live with the problem and only use the radio when stopped.
I also have a friend who has the same problems as me with his set up.
Hope this is of help.
Thanks George 2E0GLW

[K0BG]

As I said before, the problem is caused by common mode. You will have a lot common mode with a mag mount, even if you use a piece of ground strap to the body.

You have the same issue with the tire mounting frame. Not enough ground plane under the antenna. You can install a choke at the base of the ATAS to see if that helps. A 3/4 inch ID, mix 31 split bead will allow about 5 to 7 turns depending on the coax used. 6 turns give you about 2kΩ of impedance, mostly-resistive, from 1 to about 25 MHz or so. Make the turns about 3 inches in diameter. if that doesn't do the trick, add another split bead to the other side of the loops.

[M0GVZ]

Even a triple magmount gave me issues with my Tarheel on my Mondeo so using a single mag is completely pointless. Mounting on the spare wheel frame is a complete and utter waste of time even using 1" braid.

Get the drill out George. Buy a Sirio SO239 mount from Knights CB or you may pick one up at Blackpool radio rally if you're there this weekend. They're a few quid and come with a nice plastic screw on cap you can put on when not using the antenna. Drill a hole in the roof and put the antenna there. When you sell the car shove a mobile phone antenna in the hole. If you go with the rear quarter panel option for a hole, it costs about £150 for a body shop to repair the hole when you remove the antenna to sell the car. I've got a 2 year old Mondeo I've just bought. As soon as I get some new mounts this weekend the drill is coming out.