Hi Bill, Thank you. I run balanced line from my dipole to a tuner but I went ahead and found an isolated ground BNC jack in my junk box. It seems like most of the old coax based ethernet cards have one.
Chris --- In [email protected], Bill Dumke <[EMAIL PROTECTED]> wrote: > > Chris, > > It depends on the antenna. I suspect if you have a balanced antenna > like a dipole without a tuner, you might be OK. But if you have a > grounded vertical like I have, you will have a tremendous AC ground loop > to deal with. You will have a huge center spike very broad in the SDR > software. In my case I am using an RXTX v6.2 and I had to build an > external RF isolation transformer. Now I don't even see any spike at > all. Just a little dimple in the noise passband, where the sound card > cuts off at.on the low end of the audio passband. > > You can buy insulated BNC connectors. I would recommend that for the RF > line. > > If you want to see what I was up against see: > > http://ph.groups.yahoo.com/group/softrock40/photos/browse/9d29 > > Bill WA9PWR > > kd4pbj wrote: > > Hi, > > > > I see from the schematic that the return pad for the antenna connector > > is isolated from ground. How will this affect the performance if I > > ground it? I normally use regular panel mount BNC jacks and I have a > > metal enclosure I am putting my board into. Any advice is appreciated. > > > > Chris > > KD4PBJ > > > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > >
