[hpsdr] Hermes VNA interface

Tue Sep 11 05:42:51 PDT 2012

Hi Phil,

Perhaps this helps;

http://hiqsdr.finken-net.de/html/rf-cir.htm

73, Maximo - EA1DDO

> Date: Tue, 11 Sep 2012 09:15:08 +0800
> From: phil at pharman.org
> To: carcia at sbcglobal.net
> CC: hpsdr at lists.openhpsdr.org
> Subject: Re: [hpsdr] Hermes VNA interface
> 
> ***** High Performance Software Defined Radio Discussion List *****
> 
> Hi Frank,
> 
> I'm presently testing the VNA using a very simple resistive Reflection
> Bridge.
> 
> For something a little more substantial I was thinking along these lines:
> 
> http://www.wetterlin.org/sam/Reflection/3BeadBalunBridge.pdf
> 
> I've also tested the Bridge that is intended to be used with the N2PK VNA
> but for some reason I've yet to determine the performance is very poor.
> 
> 73 Phil...
> 
> 
> 
> > ***** High Performance Software Defined Radio Discussion List *****
> >
> > Hi all,
> > I wonder what is the plan for the Hermes VNA interface. Will it be a pair
> > of directional couplers with an RF switch/relay or just a return loss
> > bridge and jumper cables? I'm thinking about my junk box parts as I
> > complete outside projects getting ready for radio season.
> > Frank WA1GFZ_______________________________________________
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