[Scott Ogren]

So as a closed post has mentioned this back in 2014....

I am a ham radio operator. I just moved my rig from a BMW 335I to a Ran 3500. I am selling y home for a towable RV.

With that said, the 6.7 Cummings puts out enough interference to drown out WWV on a good night (WWV is the national standard for syncing clocks via radio, and is used in many industries)

So, I have confirmed this by:

Interference goes away, when antenna (not cable) is removed. This showed that the problem is a radiated signal, not something bleeding into cables or power connections.

Thus it is is the engine wiring somewhere.

Now the next argument might be that this is a third party equipment, and thus not Rams concern...this would be wrong!

First, this is wired thru the aux power switches in the 3500, thus dirty power (which it’s not) would still be a warranty issue.

But, turn on the cargo camera under low light, the gain the system uses to brighten the image clearly show VIDEO interference in the image, that corresponds directly to this RFI, thus showing the problem with only OEM parts...thus it IS a warranty issue.

Where do I go from here? Service Mngr is clueless!

 

[Scott Ogren]

Ps... I narrowed it dow to 7-22 Mghz

 

[lpennock]

See if there is a tsb for police service. Beads on power leads of the display might help.

Sent from my SM-T350 using Tapatalk

 

[gsfitzsr]

Scott, the cheapest way to find RFI is to use a simple battery powered AM radio, tuned off frequency. Strong RFI will cause the radio to buzz like crazy but only when it's tuned off frequency or not on any station.

So take the radio and walk around the truck while running, to see if you find any strong signals. Then open the hood and probe around all the connectors and especially ones on the computers at the firewall.

When you find them, you can try to wrap them in foil to see if this helps. I've seen on ham article where a guy had to wrap a lot of connectors with copper foil, then put a ground wire on each to the truck body. What a hassle!

Now I'm assuming when you tune to WWV your seeing S9 levels or higher right? When I use to charge batteries in my garage, the RFI from my chargers would overload all AM station broadcasts in my truck until I drove away from the house!

Let me know how it goes.

 

[Cacciatore]

It's injector noise. Modern piezoelectric injectors operate at up to 400v and wreak havoc on HF. I had a Kenwood TS-480HX in my truck for about a year and anything above 6m was trash.

Turn off the truck and the noise disappears. Trying to run HF in a diesel just isn't going to happen with the engine running.

 

[tsconver]

It's injector noise. Modern piezoelectric injectors operate at up to 400v and wreak havoc on HF. I had a Kenwood TS-480HX in my truck for about a year and anything above 6m was trash.

Turn off the truck and the noise disappears. Trying to run HF in a diesel just isn't going to happen with the engine running.

My Yaesu 857D with a little tarheel antenna mounted to the bed for HF and a Larsen 2/70 for VHF/UHF seems to work fine. Good for 70cm and 2m to 80m. No noise on the signal in any of the bands. I ran the radio direct to the battery and bonded both antennas to the truck bed with braided copper wire. Only noise I occasionally pick up is the screwdriver tuner on the tarheel antenna. I do have the main part of the radio installed behind the back seat so it is a long way from the engine compartment.

 

[Cacciatore]

My radio was under the back seat too and I was running hustler verticals bonded to the frame under the bed. 20m and 40m literally sounded like a diesel knock on the bands.

It would be nice to see an EMC report on one of these trucks.

 

[gsfitzsr]

I'm also running a Yaesu 2/70cm in my truck with the radio mounted under the back seat and head unit in my center console. Antenna is dual band whip on mag mount atop the cab. No issues on these frequencies.

 

[Cacciatore]

2m/70cm are totally fine. I have an XPR5550 on UHF and an XTL5000 on VHF on two separate 2m and 70m antennas drilled into the cab and those are working excellent. Made a 300mile QSO at 6500' ASL on .52 in the smokies

 

[WK4T-Radio]

Anything ever solved on this? I’m wondering about clamp-on ferrite on each injector lead?