<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Craig,<div class=""><br class=""></div><div class="">Our modem design was loosely based on some suggestions from SIMCOM. Like:</div><div class=""><br class=""></div><blockquote style="margin: 0 0 0 40px; border: none; padding: 0px;" class=""><div class=""><a href="https://simcom.ee/documents/SIM7100E/SIM7100_SIM5360_SIM800C Compatible Design_V1.01.pdf" class="">https://simcom.ee/documents/SIM7100E/SIM7100_SIM5360_SIM800C%20Compatible%20Design_V1.01.pdf</a></div></blockquote><div class=""><div><br class=""></div><div>I did get a SIM7100 module a year or two ago, and did some basic testing with it, but cost was just too high at that time. I will ask again to see where we are today. A quick check on aliexpress shows the SIM7100E at US$50 per module, and SIM5360E at US$20, in quantities of 1.</div><div><br class=""></div><div>My main concern is software support. On paper, the SIM7100 looks compatible, and the AT commands very close. But the same was true of the SIM7000 I tried, and that was a mess - it seems the first firmware didn’t even support the MUX mode we rely on.</div><div><br class=""></div><div>Given all the passive components required, it is probably easiest to just use a SIM5360 board, unsolder the modem module and replace it, then add / move that one antenna. To get my china contacts to make 3 one off boards is probably about the same price. In general, it is easy to get 1 or 1,000, but quantities in between are the issue.</div><div><br class=""></div><div>Regards, Mark.</div><div><br class=""><blockquote type="cite" class=""><div class="">On 21 Jun 2019, at 12:49 AM, Craig Leres <<a href="mailto:leres@xse.com" class="">leres@xse.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">On 2018-06-12 15:26, Mark Webb-Johnson wrote:<br class=""><blockquote type="cite" class="">Very easy to make. Our current modem circuit board layout actually supports both the SIM5360 (3G) and SIM7100 (4G) SIMCOM modules; we can simply drop in the appropriate module during production, and build with either 3G or 4G. If there is demand, we can satisfy within weeks<br class=""></blockquote>What is my easiest path to getting a small quantity of ovms modem cards with SIM7100A modems? I probably only need 3, should I just buy some SIM5360A ovms boards and swap the simcom modules? And I guess move or add an antenna connector? I've attached a png version of a image from the message I'm replying to. It shows the SIM5360A using ANT1 and ANT3 while the SIM7100E uses ANT1 and ANT2 (and I see now the silkscreen documents this difference).<br class=""><br class=""><span class="Apple-tab-span" style="white-space:pre"> </span><span class="Apple-tab-span" style="white-space:pre"> </span>Craig<span class="Apple-tab-span" style="white-space:pre"> </span><br class=""><span id="cid:19F431D4-0505-426D-93BE-9B0D85138A49"><PastedGraphic-2.png></span></div></div></blockquote></div><br class=""></div></body></html>