<html><head></head><body><div style="color:#000; background-color:#fff; font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div>The only guys who seem to consistently get close to CP are the</div><div dir="ltr">EME lads getting their feeds checks. Most have good Axial Ratio,</div><div dir="ltr" id="yui_3_16_0_ym19_1_1524415181240_108784">but Left vs Right .... is another issue entirely! CP reverses when it</div><div dir="ltr" id="yui_3_16_0_ym19_1_1524415181240_108665">bounces off the dish, the reverses again when it bounces off the moon,</div><div dir="ltr" id="yui_3_16_0_ym19_1_1524415181240_108663">then again when it bounces off the other guys dish. Some monitoring</div><div dir="ltr" id="yui_3_16_0_ym19_1_1524415181240_108785">by a BIG dish says that 20-30% have the wrong CP.<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1524415181240_108752"><br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1524415181240_108751">Fortunately the moon is a very rough surface and doesn't preserve polarization</div><div dir="ltr" id="yui_3_16_0_ym19_1_1524415181240_108698">very well. <br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1524415181240_108711"><br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1524415181240_108786">Back to work, got a 5.5 GHz phased array for Space W to finish this week.</div><div dir="ltr" id="yui_3_16_0_ym19_1_1524415181240_108787">(Yes, CP, and even after using the high dollar simulators I have to tweak</div><div dir="ltr" id="yui_3_16_0_ym19_1_1524415181240_108788">it on the antenna range.)<br></div><div id="yui_3_16_0_ym19_1_1524415181240_108662"><span></span></div><div class="qtdSeparateBR" id="yui_3_16_0_ym19_1_1524415181240_108661"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_ym19_1_1524415181240_108604" style="display: block;"> <div style="font-family: Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1524415181240_108603"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1524415181240_108602"> <div dir="ltr" id="yui_3_16_0_ym19_1_1524415181240_108601"> <font id="yui_3_16_0_ym19_1_1524415181240_108632" face="Arial" size="2"> <hr id="yui_3_16_0_ym19_1_1524415181240_108660" size="1"> <b><span style="font-weight:bold;">From:</span></b> Phil Karn <karn@ka9q.net><br> <b><span style="font-weight: bold;">To:</span></b> KENT BRITAIN <wa5vjb@flash.net>; Zach Leffke <zleffke@vt.edu>; "ground-station@lists.openresearch.institute" <ground-station@lists.openresearch.institute> <br> <b><span style="font-weight: bold;">Sent:</span></b> Monday, April 23, 2018 2:26 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [Ground-station] Balloon Launch - experiments?<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_ym19_1_1524415181240_108609"><br><div dir="ltr" id="yui_3_16_0_ym19_1_1524415181240_108611">On 4/22/18 23:51, KENT BRITAIN wrote:<br clear="none">> No, most are looking for something with some gain.<br clear="none">> <br clear="none">> It would be really fun to fuild a 5.6 GHz version of one of those.<br clear="none">> Microscope suggested!<br clear="none"><br clear="none">Well, I'm not an antenna guy but it seems to me that "gain" and<br clear="none">"omnidirectional" are kinda mutually exclusive.<br clear="none"><br clear="none">But are we limited to just one transmitter and antenna?<div class="yqt7486103769" id="yqtfd48903"><br clear="none"><br clear="none">Phil<br clear="none"><br clear="none"></div></div><br><br></div> </div> </div> </div></div></body></html>