[hpsdr] Can two Janus boards be used simultaneously synchronously?

[Phil Harman]

> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi Gentlemen:
>
> I'm thinking of some automatic antenna phasing experiments.  I was
> thinking of using a Delta 44 or Delta 1010 card, but am also wondering
> about using two or more Janus boards on the same Atlas backplane.  What
> are the issues I am likely to run into?
>
> 73,
>
> Rob
>

Hi Rob,

It will be possible to run two or more Janus cards on the Atlas bus. You
can phase lock the 12.288MHz clock on one card to a 10MHz reference and
use this to clock all the other boards so they are phase synchronous.

You will need to change the data out pins on the Atlas bus for each board
and change the output pin on each Janus board so they are unique.

Also need to change the Ozy code to support multiple channels but with
Kirk's recent work that is well documented and simulated.

I assume you would write your own PC code rather than try and modify
PowerSDR say?   However, PowerSDR does support two sychronous receivers
but I'm not sure how difficult it would be provide support via USB.

This would be very useful project since we could use the same basic
principle for multiple phase locked Mercury receivers on the Atlas bus.

How's your Verilog coding skills :)

73's Phil....VK6APH






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