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[Goonybird]

Wanted a way to add DAB whilst keeping my current factory head unit.
Ended up with a cheap Pure Highway without accessories.
I have a car charger and I don't want to fit with magnetic flexiarm. So that just leaves the aerial.
Noticed on the websites that is uses a 2.5mm jack plug. However this has 3 connections, unlike the two (ground and aerial) I was expecting.
Decided to have the unit apart to check. The middle connection appears to do nothing, I expect to stop people like me using their own antenna.  
But. the tip is live at +3Vdc.  :-?
So is there a small amplifier in the Pure aerials. Or do they use a blocking capacitor.
I have enough aerials. A magnetic dab that came with my Marantz DAB Tuner which would be ideal. or I have scanner magmounts which cover the frequencies without a problem.

Any advice (other than buy the expensive pure aerial) would be much appreciated.

[Dave DND]

Fairly sure its a dedicated antenna with a built in amplifier

 

[Goonybird]

Sorted it today.
Pure Highway now working in the car without the Pure accessories.  
Just for info on the forum. And for DaveDND
The aerial connection uses a 2.5mm (stereo) jack plug. Maplin code FJ85G.
Numbering from the "tip", where the tip is 1.

Connection 1 = +3Vdc (I think this must be for the aerial/antenna signal amplifier, or just to stuff up anyone who tries a non pure aerial )

Connection 2 (middle one) This is for the aerial input*

Connection 3 = Ground 0V

*Now the middle connection no:2 had me stuffed as it measures open circuit (no resistance).
When I used a DAB mag antenna that was supplied with my Marantz ST7001 I got very little signal level, barely 1 bar.
But on plugging the Highway in the car, with a aftermarket 5Vdc USB Power supply lead, the signal level jumped to full signal (all bars).
I suspect the 2.5mm jack input is disabled on batteries, and is only enabled with an external 5Vdc supply.  

I personally would shoot the designer, this is clearly aimed at ensuring you only buy Pure aerials (or the Kinetic one available elsewhere)  

[Dave DND]

Well done for sorting it out - and thanks for posting the findings