As far as static is concerned it is can be from the following reasons
1. High frequency fead back on the input power from a dirty power supply inside the ballast
2. EMI emissions from the ballast case from component that arnt sheilded
3. EMI emssions from the out put lead
4. EMI emmisions from the burner or globe
All of the above except the globe can be removed by designing the ballast properly.
Part of my business specialises in HID lighting and we get specific ballasts manufactured to specification.
this involes zero feed back signal on the input, fully earthed case and shielded, fully shielded out put lead up to the globe.
this is a zero emmision ballast upto the globe which if the light housing is below the antenna it should be fine.
These are avalible in 50W output "Refered to as 55W because thats what they draw.
I also keep 35W 70W and 100W systems.
The basic 35W cost from $95 as kit but you can get lower quality units for 1/3 of the price
The 70W and 50W fully shielded systems cost $250[for 2 globes and 2 ballasts]
The 100W systems are 100W output 110-115W draw but a but noisy,
They are an agresive ballast fast start up from cold and the light is something else.
As far as working with the ballasts you have,
1. earth the case to the earthinput lead [ Make sure the system is not earth switchin.
2. Earth the same earth to the radio earth and ground the shit out of every thing else as well as this will absorb and kill any other noise
3. Tinfoil around the output from the globe back to the ballast and earthed will neutralise HV emisions
I used to do all this nearly 10 years ago when I first started with the HID systems and after a few years I decided to design my own
The the 5012HDFSS 50W ballasts [50W 12V] are avalible in lead lenghts from 30cm to 1m long and come standard with a single weather Pack 2 pin plug to prevent lead damage.
I supply these to a lot of CASE, NH and JD dealers as new fitments because they are reliable and can be roof mounted in combines with any modifications.
hope this helps:thumb:
