1. The line trap acts as a barrier or filter to prevent signal losses. 2. Harvard is a fur-lined trap _ it's one of the best. 3. The line trap is also used to attenuate the shunting effects of high-voltage lines. 4. Franchitti reached 238.936 mph at the start / finish line trap on his 49th lap. 5. Franchitti reached 238 . 936 mph at the start / finish line trap on his 49th lap. 6. A line trap may be covered with a bird barrier, in which case there are four components. 7. The main coil is the outer part of the line trap which is made from stranded aluminum cable. 8. Hence, a line trap unit is inserted between the busbar and connection of coupling capacitor to the line. 9. With the use of a tuning device, a line trap can be tuned to a frequency of 1000 Hz. 10. The impedance of a line trap is very low at the power frequency and will not cause any significant voltage drop.