Anyone know how to gently hack the X-band detector so it can be modulated externally?

ElectricAye

The Parallax X-band detector has an inbuilt circuit that modulates the 10.525 GHz signal at around 2 KHz. I was wondering if it's possible to gently access the pins or traces of the X-band so that the modulation could be controlled externally. In other words, could the Enable pin be left low, but then have external +5 volt signals be applied to the oscillator to modulate it as desired? On the diagrams, this modulating voltage signal is marked as V(+5) going to the OSC. But does anybody know what vias or traces might connect from the outside without requiring the unit to be disassembled? Thanks.

http://www.parallax.com/StoreSearchResults/tabid/768/List/0/SortField/4/ProductID/606/Default.aspx?txtSearch=x+band

Duane C. Johnson

It looks like you could force the oscillator to output a HIGH on the lower input of the AND gate then use the as an external oscillator input.

Duane J

ElectricAye

Duane C. Johnson wrote: »

It looks like you could force the oscillator to output a HIGH on the lower input of the AND gate then use the as an external oscillator input....

Okay, I see what you're saying about using the EN as the control signal for modulating the 10 GHz oscillator, but do you have any idea where I could tap into the 2 KHz oscillator and force it high? Is there a pin or trace for the 2 KHz oscillator accessible from the outside of the unit? The X-band unit has lots of little vias and so forth that appear accessible but I don't know what any of them might be.

Duane C. Johnson

I'm sorry but I don't have this device. So your on your own without a schematic.

Duane J