<div>kpc3 draws about 14ma with lights off, not bad at all! </div>
<div>typical mobile radio draws 1.4amps rx, 12 on TX if hi power, 5amps if low power.</div>
<div> </div>
<div>you need to figure out your ratio of RX to TX.... let's say it's once every 3 minutes. That is 1 second tx (give or take TXDelay) and 179sec rx, spread over an hour. Your radio will spend all but 20 seconds in receive mode.... 59.6 minutes in receive... or 99.3%. The0 .7% of the time is spent in TX mode at high current draw.</div>
<div> </div>
<div> </div>
<div>TX mode= .007 x (12.014A) = .084Ah</div>
<div>Rx mode= .993 x (1.414A) = 1.404Ah </div>
<div>total power is 1.488Ah.</div>
<div> </div>
<div>If you use a HT w/o battery saver, count on .3 amp for RX and 1.5amp for TX</div>
<div>
<div>TX mode= .007 x (1.514A) = .011Ah</div>
<div>Rx mode= .993 x (0.314A) = 0.310Ah </div>
<div>total power is .320Ah.</div></div>
<div><br>By using an HT, you realize a 4½ increase in operating time. Note that most of the power budget is spend running the reciever.</div>
<div> </div>
<div>If you plan ot use this setup with a private, temporary network, you can use the AXHANG parameter of the digipeater and make it have a really long TXD on an initial transmission and a normal TXD on subsequent transmissions. You'd need to set the drop time (can't remember parm) to the sleep time of your HT rx draw will drop to .03amp over all.</div>
<div> </div>
<div>Wes<br> </div>
<div><span class="gmail_quote">On 2/26/08, <b class="gmail_sendername">Ev Tupis</b> <<a href="mailto:w2ev@yahoo.com">w2ev@yahoo.com</a>> wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">I'm thinking about "backpack portable" operation with<br>a full-blown TNC/transceiver(. I'm figuring the draw<br>
to average 2 amp-hours, but haven't decided just how<br>long to need that draw.<br><br>Before I go considering choices, I wonder if anyone<br>on-list has any experience with "backpack portable<br>friendly batteries/configurations" and would care to<br>
comment on their trials/tribulations/successes?<br><br>Regards,<br>Ev, W2EV<br><br><br><br> ____________________________________________________________________________________<br>Never miss a thing. Make Yahoo your home page.<br>
<a href="http://www.yahoo.com/r/hs">http://www.yahoo.com/r/hs</a><br><br>_______________________________________________<br>aprssig mailing list<br><a href="mailto:aprssig@lists.tapr.org">aprssig@lists.tapr.org</a><br><a href="https://lists.tapr.org/cgi-bin/mailman/listinfo/aprssig">https://lists.tapr.org/cgi-bin/mailman/listinfo/aprssig</a><br>
</blockquote></div><br><br clear="all"><br>-- <br>Today Hell froze over, forcing thousands upon thousands of <br>people to keep promises they never thought they'd have to.