[hpsdr] Hermes Beta boards.

[Dan Habecker]

Put me on the list as interested in the USB Hermes bare board.

Also maybe I can offer some help on the layout changes.

73,
Dan W9EQ


On Sun, Aug 8, 2010 at 3:05 PM, Kjell Karlsen <la2ni at online.no> wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi Phil.
>
> First, I wonder if you have received my e-mail where I commented the Hermes
> Gamma Schematics? I have not received any reaction from Tony on that e-mail.
> It is very important that the construction of the SMPSU is made according to
> the original construction to be sure the results are the same. I also think
> we must be sure the grounding is done in a proper way on the rest of the
> board.
>
> I listened to the last teamspeak and heard that Jeremy (I think it was)
> suggested that we give the HPSDR community all infos for the Beta PCB´s and
> all measured data on the present board so that people that want it can make
> there own Hermes with USB interface.
>
> To make more PCB without modifying it is not a way to go. The spurious
> radiation from the TX is all to high and the modifications I made are to
> time consuming to be advisable.
>
> I think it might be possible to modify the layout and get a working Hermes
> with quite good performance just by removing the Power layer and replace it
> with a continuous Ground Plane. The power routing can be moved to the other
> layers. All critical tracks have to be moved and by improving the decoupling
> following my advice I think the results will be much better.
>
> If someone want to do that it might be some interest by experimenters to
> buy just PCB´s. Making a list first to see how many that are interested and
> then decide what to do might be possible. I do not think there are many that
> will do it, but you never know!
>
> I will follow the "LAN road" myself but I can assist if someone want to
> develop the USB further.
>
> 73, Kjell
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