[Scan-DC] Detect-A-Pass E-ZPass Transponder Detector

[Andrew Clegg]

I don’t know for sure yet. The instructions said to place the detector within 3 ft of your EzPass. That’s what makes me believe it’s honing in on emissions from your own device. I’ll look into it further when I’m back. 

> On Jan 15, 2018, at 3:15 PM, Jeff Krauss <jeff at krauss.ws> wrote:
> 
> Are you sure you aren't detecting the emission from the reader?
> I think the way the EzPass works is that the device in your car is a homodyne transmitter that reflects back the signal from the reader after it modifies the signal in a way that is unique to your device.
> At least some of the readers are manufactured by Kapsch, operate in the 915 MHz range licensed under Section 90.353, with output power around 1 watt.  Search the ULS with Radio Service code LN for transmitter locations.
> Licensees include 95 Express Lanes, LLC , Capital Beltway Express, LLC, TOLL ROAD INVESTORS PARTNERSHIP II, L.P., etc.
> 
> 
> At 02:38 PM 1/15/2018, Andrew Clegg wrote:
> 
>> - The device apparently works by detecting emissions from _your_ EzPass. It detects when your EzPass responds to an interrogation, apparently. So if you don't have an EzPass in your car, I don't think the detector will work.
> 
> 
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