<div dir="ltr">Nice load averages...but is anyone actually stressing the link??<br></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Oct 11, 2013 at 1:10 AM, David McKenzie <span dir="ltr"><<a href="mailto:k1fsy@vhfwiki.com" target="_blank">k1fsy@vhfwiki.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"> 23:09:52 up 3:23, 1 user, load average: 0.40, 0.38, 0.40<br>Thu Oct 10 23:09:52 UTC 2013<br><br></div>
<div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Oct 10, 2013 at 4:38 PM, John Foege <span dir="ltr"><<a href="mailto:john.foege@gmail.com" target="_blank">john.foege@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div>I'm curious what the objective of this whole experiment is??<br><br></div>I could understand hooking up a deep-cycle gel cell marine battery or something + a charging system + a 13.8V PSU = the link electronics / transceiver would run 24/7 and have battery backup for power outages...<br>
<br></div>But, I'm just curious in general what the point of fooling around with a step-down converter and a long line of AAs is?? I'm not understanding what the idea is.<br><br>And, secondly, is it really a concern whether or not the link can run on battery power? Or are you still thinking about Chris' suggestion of using a big fat solar panel + a gel cell + charging system and making a portable unit that can be hoisted up into a tree, etc. ?<br>
</div><div><div><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Oct 10, 2013 at 10:27 PM, David McKenzie <span dir="ltr"><<a href="mailto:k1fsy@vhfwiki.com" target="_blank">k1fsy@vhfwiki.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">I'm currently testing it with 8x generic AAs in series. So that's probably about 2500mA @ 12v. The raspi with wifi/soundcard running the link with my ssh session open is drawing around 275mA average from the batteries measured on the battery side of the dc/dc converter. It's been up for about 40 minutes and the batteries are reading a steady 12.01 volts. I don't know how long it will take before Vin < Vout (it just passes through lower than set voltage) will be enough to turn off but a back of the hand calculation of 2500mAh / 275mA = about 9 hours of run time. <br>
</div><div><div><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Oct 10, 2013 at 12:05 AM, David McKenzie <span dir="ltr"><<a href="mailto:k1fsy@vhfwiki.com" target="_blank">k1fsy@vhfwiki.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>no, ~5.6v (because AAs run hot) down to 5v. <br><br></div>that's a LM2596 switching regulator board; Vin > Vout only. I have 10 of them now. Supposedly something like 95% efficient. That's an 8-cell battery pack I should load it up and give it another test.<br>
</div><div><div><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, Oct 9, 2013 at 11:50 PM, John Foege <span dir="ltr"><<a href="mailto:john.foege@gmail.com" target="_blank">john.foege@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><p>4 AAs in series? 5.2V to 12V DC-DC regulator?</p>
<p>Can you set it for 1.3V to 13V and run the batts in parallel?</p>
<p>I'm assuming this doesn't make any difference in run-time due to either having a 1800 mAh 5.2V cell or a 1.3V 7200 mAh cell with the converter...unless I'm having a massive brain fart...</p>
<div class="gmail_quote"><div>On Oct 10, 2013 12:04 AM, "David McKenzie" <<a href="mailto:k1fsy@vhfwiki.com" target="_blank">k1fsy@vhfwiki.com</a>> wrote:<br type="attribution"></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<p dir="ltr">Got the switching regulator modules from China. It ran for 3 mind on those 4 nearly dead AAs :)</p>
<br></div>_______________________________________________<br>
450 mailing list<br>
<a href="mailto:450@lists.vhfwiki.com" target="_blank">450@lists.vhfwiki.com</a><br>
<a href="http://lists.vhfwiki.com/cgi-bin/mailman/listinfo/450" target="_blank">http://lists.vhfwiki.com/cgi-bin/mailman/listinfo/450</a><br>
<br></blockquote></div>
<br>_______________________________________________<br>
450 mailing list<br>
<a href="mailto:450@lists.vhfwiki.com" target="_blank">450@lists.vhfwiki.com</a><br>
<a href="http://lists.vhfwiki.com/cgi-bin/mailman/listinfo/450" target="_blank">http://lists.vhfwiki.com/cgi-bin/mailman/listinfo/450</a><br>
<br></blockquote></div><br></div>
</div></div></blockquote></div><br></div>
</div></div><br>_______________________________________________<br>
450 mailing list<br>
<a href="mailto:450@lists.vhfwiki.com" target="_blank">450@lists.vhfwiki.com</a><br>
<a href="http://lists.vhfwiki.com/cgi-bin/mailman/listinfo/450" target="_blank">http://lists.vhfwiki.com/cgi-bin/mailman/listinfo/450</a><br>
<br></blockquote></div><br></div>
</div></div><br>_______________________________________________<br>
450 mailing list<br>
<a href="mailto:450@lists.vhfwiki.com" target="_blank">450@lists.vhfwiki.com</a><br>
<a href="http://lists.vhfwiki.com/cgi-bin/mailman/listinfo/450" target="_blank">http://lists.vhfwiki.com/cgi-bin/mailman/listinfo/450</a><br>
<br></blockquote></div><br></div>
</div></div><br>_______________________________________________<br>
450 mailing list<br>
<a href="mailto:450@lists.vhfwiki.com">450@lists.vhfwiki.com</a><br>
<a href="http://lists.vhfwiki.com/cgi-bin/mailman/listinfo/450" target="_blank">http://lists.vhfwiki.com/cgi-bin/mailman/listinfo/450</a><br>
<br></blockquote></div><br></div>