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<div dir="ltr">Hi Phil,<br><br>Perhaps this helps;<br><a href=" http://hiqsdr.finken-net.de/html/rf-cir.htm"><br>http://hiqsdr.finken-net.de/html/rf-cir.htm</a><br><br>73, Maximo - EA1DDO<br><br> <br><br><br><div><div id="SkyDrivePlaceholder"></div>> Date: Tue, 11 Sep 2012 09:15:08 +0800<br>> From: phil@pharman.org<br>> To: carcia@sbcglobal.net<br>> CC: hpsdr@lists.openhpsdr.org<br>> Subject: Re: [hpsdr] Hermes VNA interface<br>> <br>> ***** High Performance Software Defined Radio Discussion List *****<br>> <br>> Hi Frank,<br>> <br>> I'm presently testing the VNA using a very simple resistive Reflection<br>> Bridge.<br>> <br>> For something a little more substantial I was thinking along these lines:<br>> <br>> http://www.wetterlin.org/sam/Reflection/3BeadBalunBridge.pdf<br>> <br>> I've also tested the Bridge that is intended to be used with the N2PK VNA<br>> but for some reason I've yet to determine the performance is very poor.<br>> <br>> 73 Phil...<br>> <br>> <br>> <br>> > ***** High Performance Software Defined Radio Discussion List *****<br>> ><br>> > Hi all,<br>> > I wonder what is the plan for the Hermes VNA interface. Will it be a pair<br>> > of directional couplers with an RF switch/relay or just a return loss<br>> > bridge and jumper cables? I'm thinking about my junk box parts as I<br>> > complete outside projects getting ready for radio season.<br>> > Frank WA1GFZ_______________________________________________<br>> > HPSDR Discussion List<br>> > To post msg: hpsdr@openhpsdr.org<br>> > Subscription help:<br>> > http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org<br>> > HPSDR web page: http://openhpsdr.org<br>> > Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/<br>> <br>> <br>> _______________________________________________<br>> HPSDR Discussion List<br>> To post msg: hpsdr@openhpsdr.org<br>> Subscription help: http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org<br>> HPSDR web page: http://openhpsdr.org<br>> Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/<br></div></div>
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