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rf transponder rings sensitivity issues


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tonyberg 
Copper - Posts: 116
Copper spacespace
Joined: November 08, 2005
Location: North Dakota, United States
Posted: December 18, 2007 at 4:21 PM / IP Logged  
racing_bidule wrote:
A 1.5K resistor squeezed between the transponder and your loop will generate enough heat to avoid a transponder failure even at -55c. Make sure the resistor is powered OFF when ignition is ON (one end of the resistor to 12vdc, the other to 12ACC) to avoid amplifying the noise generated by the current flowing in the resistor when the transponder challenge is engaged by the immobilizer module.

explain that to me, where does the resistor go...in line with which pins to generate heat.....im confused here I guess, I understand the theory just not the application

racing_bidule 
Copper - Posts: 66
Copper spacespace
Joined: December 13, 2007
Location: Quebec, Canada
Posted: December 21, 2007 at 12:19 AM / IP Logged  

OK, the whole idea is that transponders are getting less sensitive when they freeze.

If you connect one end of a resistor to 12 Volts and the other end to Ground, current flowing true the resistor will generate heat. Providing that small amount of heat to your transponder will be sufficient to prevent it from freezing. So a 0.05$ resistor can save you come backs related to sensitivity issues especially where the climate is extremely cold.

Transponder will perform well to a temperature above -25C, below this temperature the component is not rated to perform anymore (in multiple brands) If you want to avoid it reaching this temperature, install a electric heater (a resistor).

Now also, cheap transistors loose a lot of gain when they are submited to very cold temperature. If you buy cheap modules, you buy cheap transistors. Pay for military grade component, it's worth it. 

If you fail on your first attempt, at least destroy all evidence you tried!
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