[hpsdr] Possible added feature request

Scott Traurig scott.traurig at gmail.com
Wed Nov 4 03:15:10 PST 2020


On Wed, Nov 4, 2020 at 2:46 AM Helmut Oeller <dc6ny at gmx.de> wrote:

> Scott, your reference suffers from a fundamental design fault: The balun
> between the LC network and the symmetrical input port will not work as
> expected or provide suffient common mode rejection (> 30 dB) on the 50 ohms
> coax side. The balun needs for efficiency a constant Z. Either you spend a
> symmetrical LC network or let a unsymmetrical LC combination float. But in
> each case the balun has to be placed at the 50 ohms side.
>
That may be true, but it doesn't invalidate it as a general example of this
sort of thing. Let's not throw the baby out with the bathwater. At any
rate, if that one doesn't float your boat there are other examples out
there if you search for them.

73,

Scott
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