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Ford Chassis Ambulance VHF Interference

charleswmoore

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Joined
Dec 19, 2002
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Hey folks has anyone experienced Radio Interference in the VHF band being generated by a 2019 Ford Chassis Ambulance. This is actually a 2020 Osage ambulance. I have almost 8 db of receiver degradation once the ignition key is inserted. It also degrades other vehicles when closely oriented so antenna reloacation would not be a fix. Also effects handhelds when near the vehicle. I can see the noise floor on the spectrum rise significantly when ever the vehicle systems are woke up. Does not have to be started just woke up! Sniffing the vehicle it appears it is strongest when probing around the Dash display. Also I did a test in the UHF band and degradation is measurable but in significant to cause problems. If anyone has seen a product bulliten on anything I can hang my hat on would be great, Thanks
 

k3hal

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fwiw...
i had a full size bronco w/same prob. ford had an issue they chose to push aside because there was no need to cater to us techies! try not to rule out the fuel pump that is located inside the gas tank. good luck.
 

chief21

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Chassis-related possibilities include fuel pump and vehicle computer(s) and/or display(s). Since you mentioned that the strongest signal seems to be located at the dash, I'd concentrate on the vehicle computer/display as the most likely problem.
Body-related possibilities (if present) could be numerous... siren/PA system, strobe lighting, LED lighting, GPS, laptop/mobile data and mobile radio equipment - to name a few. If there is a master switch in the console, confirm that ALL of the accessory circuits are controlled by the master and check for anything that might still be powered up.
 

a417

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I'd get Osage involved, as they're involved in upfitting.

BTW, 17 years is a long time for a first post, congrats!
 

n3obl

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check to see where they tapped the power for the radio power leads. Seen a recent thread elsewhere about a ground going into the multiplex system. Hence no adequate ground.
 

kayn1n32008

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check to see where they tapped the power for the radio power leads. Seen a recent thread elsewhere about a ground going into the multiplex system. Hence no adequate ground.
I was just thinking the exact same thing.
 

n3obl

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and it was osage also. wonder if the factory is not running wiring properly ?
 

charleswmoore

Newbie
Joined
Dec 19, 2002
Messages
2
Hey folks has anyone experienced Radio Interference in the VHF band being generated by a 2019 Ford Chassis Ambulance. This is actually a 2020 Osage ambulance. I have almost 8 db of receiver degradation once the ignition key is inserted. It also degrades other vehicles when closely oriented so antenna reloacation would not be a fix. Also effects handhelds when near the vehicle. I can see the noise floor on the spectrum rise significantly when ever the vehicle systems are woke up. Does not have to be started just woke up! Sniffing the vehicle it appears it is strongest when probing around the Dash display. Also I did a test in the UHF band and degradation is measurable but in significant to cause problems. If anyone has seen a product bulliten on anything I can hang my hat on would be great, Thanks
Thanks for the replies: We are going to take a few steps and see if we can reduce the level to a livable amount????

1) Relocate Radio transceiver from behind passenger seat
and move it into Box area. This will give us more shielding
between Radio and Dashbrd dispaly.

2) Explore the relocation of primary dispatch antenna from
optimum location of center of the box to the far rear
of unit. Again this will give us more shielding from
dashboard to antenna.

3) Install additional bonding straps between hood brackets
and chassis. This is to possibly reduce the amount of signal
being radiated from wiring passing through fire wall.
 

kayn1n32008

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Before doing any of that, ensure the radio is grounded to the chassis of the ambulance. Moving the RF deck away from the dash won’t likely help any, nor will moving the antenna.
 
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