RFI Comparison

Background:

One of the biggest problems with HID lights in aircraft has been radio frequency interference issues.  For the last few years the only way to get a working HID system

in an aircraft was to go with a D2S bulb.  The D2S bulbs worked because the igniter was built into the bulb (see here).  Keeping the igniter in the bulb

allowed for a much "cleaner" circuit.  Our system uses a separate bulb, ballast, and igniter.  We have worked for the last 2 years to develop a ballast

and igniter that is as clean and quiet as the D2S bulbs that are currently on the market.  The test data on this page shows that our system is  just as quiet

as the D2S systems that cost $500+ for a single light.  Doing this, has allowed us to keep the price at a fraction of the other systems on the market.

Below are charts for 105mhz -137mhz.  We have charts for 325-340mhz(ILS glideslope), 1030-1090mhz(transponder, DME), and

1227-1575mhz(GPS). If you would like to see any of the higher frequency charts we will be more than happy to email them.

Overview:

1. All charts below are from 105mhz - 136mhz which includes all aircraft communication and VHF nav frequency bands.

2. All the noise on the left side of  the charts is FM broadcast radio stations, 105mhz-107.9mhz

3.  The left chart in all the pictures is a baseline, that is what you are comparing the other 2 charts with.

4. The middle chart is noise conducted back into the battery leads(intercom noise).

5. The right chart is the radiated noise  measured at 8" from the system as would be received by a com or nav antenna.

6. The leading edge systems have slightly higher noise due to the larger bulb.  This is unavoidable for either D2s or our system.

35w MR16(wingtip) Lights

50w MR16 (wingtip) Lights

35w Leading (PAR36 Conversion)

50w Leading Edge (Par36 Conversion)

D2S System (old standard)

Regular Ballast Comparison

In the middle chart notice the 50w leading edge bulb, powered with low noise(Planelights) ballast.  Then the chart on the right is

noise radiated using the older style ballast with integrated igniter.  The noise whipes out all but the strongest FM broadcast stations.  

You can see there is no comparing the older style on the new ballast RFI noise levels.

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