[hpsdr] Still thinking outside the Box

[Phil Harman]

Hi Luke,

My preliminarily investigation into adding a VNA facility to Hermes
indicates it can be done by just adding code to the FPGA.  No additional
hardware will be required - apart from an external bridge/directional
coupler, if other than transmissions measurements are required.

Mercury + Penny is a little more difficult since we have to phase
synchronise the Tx and Rx signals but I've a few ideas to try in that
regard.

The bulk of the work will be in the PC code.

73 Phil...VK6APH






> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi all ...
>
>
>
> I figure there are two or three major aspect of implementation of a VNA.
>
>
>
> Firstly, whilst there has been an agreement that it is conceivable with
> Hermes, I would feel that it is important to have an implementation that
> used Mercury/Pennylane.  Having said that, I am very new to this SDR
> project
> and have absolutely no idea about the viability of same ... from a
> hardware
> or software perspective.
>
>
>
> Has anyone given any thought to exactly what additional hardware (if any)
> would be needed to implement a VNA in the HPSDR projects as they currently
> stand?  I guess we have the expertise in this group to implement the
> hardware. (if any)
>
>
>
> Which brings me to my second point.  Phil has already stated that there is
> some open source VNA software (which I had already found and downloaded J
> )
> which should be a good starting point.  It was going to take me some time
> to
> get my head around the PowerSDR software in it's own right. Add to that
> the
> VNA software (written in Python by the way, not my native language) and I
> have a steep learning curve and will need time to get up to speed.
>
>
>
> Are there any programmers note and or other documentation that I can use
> to
> help me get up to speed a bit more quickly?
>
>
>
> --
>
> Cheers
>
> Luke
>
> ---
>
> JP(Qual) : VK4KYT
>
> ----
>
> Work thou not on energised equipment, for if thou doest,
>
> thy fellow workers will surely buy beer for thy widow
>
> and console her in other ways.
>
> ====
>
>
>
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