Receiver for a jammer....

**Vonkie** · 12-19-2005, 08:36 AM

Has anybody successfully constructed a laser receiver to trigger a jammer??

I was thinking of using a standard phototransistor with a sensitive pre-amp followed by a filter sharply tuned to 1.106 MHz (904 nSec) and a pulse extender for the trigger.

Will it work??

**jimbonzzz** · 12-19-2005, 08:49 AM

As far as I know, most commercial units use a photodiode for detection. Specifically, many use the SFH203 (Osram) or one of it's variations, usually including a spectral filter. Something to look into...

Jim

**Vonkie** · 12-20-2005, 09:04 PM

Nobody on the forum ever tried this???

Can't believe it ... :shock:

**truemagellen** · 12-26-2005, 11:33 AM

Originally Posted by Vonkie

Nobody on the forum ever tried this???

Can't believe it ... :shock:

I don't understand why you need it

laser jammers detect laser....and jam it

the receiver is built in to the design otherwise how would it recognize it

maybe I'm confused by your questions :?

**Won Hunglo** · 12-26-2005, 02:42 PM

Originally Posted by Vonkie

Nobody on the forum ever tried this???

Can't believe it ... :shock:

Why would anyone want to put the time, effort & money into re-inventing the wheel?

**Vonkie** · 12-27-2005, 12:27 AM

It is for a home built unit..... Forum project :wink:

As for reinventing the wheel, it may be so but I don't think so.. :?

**BMW_525_TDS** · 01-01-2006, 02:44 PM

You need a photo diode, band-pass filter and a good op-amp..

band-pass should be from 70- 670 Hz (audio range).. :-)

In normal conditions you could use a circuit from graphic eq. (filter and op-amp) and with this filtered and amplified signal you should trigger a warning... :-)

**Vonkie** · 01-02-2006, 12:46 AM

Wouldn't you need some kind of a pulse extender as well???
Just thinking of the short pulse received from the laser gun......

**drive-smart** · 01-02-2006, 08:50 AM

Almost missed this!LOL

On the Defender2 in-car box there is a socket to plug in a slave Pulse Master.
This will set the jammer off if it gets a laser pulse hit.

**jimbonzzz** · 01-02-2006, 09:13 AM

Originally Posted by Vonkie

Wouldn't you need some kind of a pulse extender as well???
Just thinking of the short pulse received from the laser gun......

I would like to know this too.
With some of the photo diodes I have tried, they are slower so they have extended the pulse naturally. But the SFH203 has a 5ns rise/fall time, I have not yet tried this one yet with a laser gun.