<div dir="ltr">Griff,<div><br></div><div>Just be careful there. The current FCC regs for 70cm only allow 56 kilobauds and FSK would be one bit per baud. You are also limited to 100 Khz bandwidth.</div><div><br></div><div>See <a href="http://www.w5yi.org/page.php?id=139">http://www.w5yi.org/page.php?id=139</a> 97.307(f)6</div><div>and <a href="http://www.w5yi.org/page.php?id=137">http://www.w5yi.org/page.php?id=137</a> (70cm Emission Types)</div><div><br></div><div>Tom was chiding me on a radio being built that I am involved in.</div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Jan 21, 2015 at 4:41 PM, Griff <span dir="ltr"><<a href="mailto:griff@thehamlins.org" target="_blank">griff@thehamlins.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
For a 100kbps link on 70cm, check out the inexpensive ($25) "moteino" digital 70cm transceiver at <a href="http://lowpowerlab.com" target="_blank">http://lowpowerlab.com</a>". These have only a 0.1 watt FSK transmitter, with settable data rates between about 9600bps and 600kbps, using signal bandwidths from about 10khz to 600khz. I see a range at 70kbps of about 1/4 mile between two mobile antennas. For longer range, I will soon receive an inexpensive ($50) Chinese 3 to 5 watt power amplifier. Search <a href="http://ebay.com" target="_blank">ebay.com</a> for " 433mhz fsk radio amplifier 3-5W" and you'll see them. There is also an inexpensive 7-watt power amplifier from <a href="http://www.minikits.com.au/70cm-7W-Amplifier" target="_blank">http://www.minikits.com.au/<u></u>70cm-7W-Amplifier</a>. There is also a more expensive ($215) 30 watt amplifier, 7025PA, from<br>
Down East Microwave (<a href="http://fwfvq.tehfm.servertrust.com/category-s/1836.htm" target="_blank">http://fwfvq.tehfm.<u></u>servertrust.com/category-s/<u></u>1836.htm</a>). Down East Microwave engineer says it should work fine with FSK, but I haven't tried it.<br>
<br>
Griff W5VWP<div class="HOEnZb"><div class="h5"><br>
<br>
On 01/21/2015 04:01 PM, Tom Hayward wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
On Wed, Jan 21, 2015 at 3:52 PM, John D. Hays <<a href="mailto:john@hays.org" target="_blank">john@hays.org</a>> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
Pointing the dish could be accomplished over a much lower rate and more robust radio link.<br>
</blockquote>
<br>
Sure. My hypothetical also assumes no link redundancy. So far HamWAN<br>
has redundant links, so this wouldn't be an issue.<br>
<br>
But let's explore the robust link option... Do you know where we might<br>
get a medium-speed link? 100kbps over UHF would be ideal, but I don't<br>
have the hardware to do it. ;-)<br>
<br>
Tom KD7LXL<br>
<br>
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</div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><br><hr><div style="float:left;padding-left:1em;color:blue">John D. Hays<br><span style="color:rgb(128,128,128)">K7VE</span></div><div style="float:left;padding-left:1em;color:blue"><span style="color:rgb(128,128,128)"><br></span></div><div style="float:right;text-align:right">PO Box 1223, Edmonds, WA 98020-1223 <div style="padding-top:0.5em"><a href="http://k7ve.org/blog" target="_blank"><img src="http://k7ve.org/images/blog-icon-box-red-26.png"></a> <a href="http://twitter.com/#!/john_hays" target="_blank"><img src="http://k7ve.org/images/Twitter-26.png"></a> <a href="http://www.facebook.com/john.d.hays" target="_blank"><img src="http://k7ve.org/images/Facebook-26.png"></a></div><div style="padding-top:0.5em"><br></div></div></div></div>
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