tag:blogger.com,1999:blog-14528866.post-1123450141450687682005-08-07T11:29:00.000-10:002005-11-08T12:53:35.270-10:00This is Ultralife's specs for the battery that Thomas sells:<a href="http://www.ultralifebatteries.com/datasheet.php?ID=U9VL">Ultralife Batteries - U9VL</a>. Note that the maximum pulse discharge is rated at 400 ma... that is just adequate for the ATS-3, which draws about 420 ma at 7.8v (see <a href="http://www.ae5x.com/ats3.html">AE5X's statistics</a> for a 9v alkaline transistor radio battery).<br /><br />Weight is good at 33.8 grams. Also note the discharge/capacity curve for 60 ohms (125 ma) shows a decline to 7.0 volts at 80% capacity (960 mah apparently.) Short circuit current is initally 3 amps, but falls to about 1.3 amps and then levels off until minute 3, where the current falls again, presumably when the current limiter kicks in (and that's not reversable.)<br /><br />Current draw from the ATS3 would be about 110 ma in a QSO. The battery will probably last a bit over 5 hours to 7.0 volts. [How did I get that? Assume 44% key down while transmitting... that's exact for "PARIS", 50 elements, 22 with key down... and say 50% transmit time in a QSO, that's 22% transmitting and 78% receiving time. At 7.5 volts, the ATS3 has an output of 2.05w, drawing 404 ma transmitting and 27 ma receiving.]<br /><br />On continuous recieve, the battery would last around 42-45 hours.AH6RPnoreply@blogger.com