FINAL YEAR PROJECT'S AND GUIDANCE

Posted by education training on Tuesday, August 18, 2009

FINAL YEAR PROJECT'S AND GUIDANCE

Constant-Current Battery Charger

Posted: 17 Aug 2009 06:36 PM PDT

There are many ways of battery charging but constant-current charging, in particular, is a popular method for lead-acid and Ni-Cd batteries. In this circuit, the battery is charged with a constant current that is generally one-tenth of the battery capacity in ampere-hours. So for a 4.5Ah battery, constant charging current would be 450 mA.

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EDGE Compact and EDGE Classic Packet Data Performance

Posted: 17 Aug 2009 02:39 AM PDT

In that case, EDGE Compact may be used for initial deployment using as little as 1 MHz in each direction allowing only three 200-KHz frequency carriers. This means allocating one frequency to each of the three sectors per base station, and the frequency set is reused at every base station . EDGE Compact uses discontinuous transmission based on a 52 -multiframe2 (a multi-frame consisting of 52 frames) and designates different time slots and frames for sending control information.


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