[hpsdr] Mercury - Placement on Atlas Bus

[Phil Harman]

Hi Gerd,

Thanks for the suggestion - I'll give it a try.  I will shortly be loading 
new Mercury FPGA code to SVN that will add some more features. That will 
make Mercury-EU even better!

Happy Christmas.

73's Phil...VK6APH


----- Original Message ----- 
From: "Gerd Loch" <g.loch at nt-electronics.de>
To: <hpsdr at lists.hpsdr.org>
Sent: Tuesday, December 23, 2008 8:14 PM
Subject: [hpsdr] Mercury - Placement on Atlas Bus


> ***** High Performance Software Defined Radio Discussion List *****
>
>
> All,
>
> I experienced this problem too for Mercury-EU and asked for impedance
> measurements on Atlas without receiving qualified response.
>
> The reason for this problem:
> There are reflections on the Atlas bus leading to false clock triggering.
>
> The solution:
> Change the firmware on Mercury to correct the wrong pin configuration for
> clocks: they are programmed with series resistors leading to a slow clock
> rising and falling edge which makes the clock pulses more sensitive for
> reflections. They should be changed to "slew 8_2" (especially MCLK 122.88 
> on
> Atlas_A6)
>
> 73, Gerd
> DJ8AY
>
>
> Mercury-EU is always better.
>
>
>
>
> < All,
>
> <Good to see that the long awaited Mercury boards have started to arrive.
> <Just one thing if you are using your Mercury with Penelope.  For some
> <reason
> <the location of Penelope on the Atlas seems to be important. Placing
> <Penelope BETWEEN Mercury and Ozy seems to work OK.  Not sure why this
> <should be but working on the issue at the moment.
>
>
> <73's Phil.....VK6APH
>
>
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