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Signal jammers are electronic devices which made to operate in certain external conditions, and the surrounding temperature is one of them as well. You see, most jammers have strictly defined temperatures in which they can do their job perfectly. If the temperature goes below zero or higher than +50 Celsius degrees - you never know what might happen, especially if your jammer has no cooling fans.
Still there are some exceptions from this rule. The temperature-resistant jammer is made to counter the bad weather conditions in the various regions of the world for military forces using it be able to get the necessary jamming effect from the reliable and stable working jamming device. The temperature range of this jammer is much wider than of common types.
As you can see, temperatures between 0C and +50C degrees are normal for any type of jammer, yet there are exceptions from this rule which might be used by you in your advantage!