[hpsdr] VNA interface

[Phil Harman]

Hi Frank,

Thanks Maximo, that looks like a very suitable bridge to use with Hermes
in VNA mode.

I agree with the use of a pad at the output of the source port and have
included a note to that effect in the User Guide. Alternatively, you could
include this in the Transverter output of Hermes so that an external pad
was not required.

Can't find a problem with the link here... try going directly to Sam's web
page at

http://www.wetterlin.org/sam/

and navigate from there.

73 Phil...VK6APH



> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi All,
> Phil I would think Maximo, EA1DDO has found a nice interface with plenty
> of isolation. I have a simple one on a single core plus a resistor that
> does about 25dB isolation over HF. Also I would think it a good idea to
> put a 3dB  or 6dB pad on the RF source port to force the source Z to 50
> ohms. I built mine from the ARRL Solid State Handbook. It is a hybrid
> splitter which is a return loss bridge. QEX had one with 3 cores a few
> years ago. I had a couple emails with author on how to modify the layout
> to reduce lead lengths by stacking the cores.
> I could not open the link Phil provided. Frank
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