[hpsdr] Mercury V2.9 available

[Phil Harman]

Hi Joe,

Sorry about the confusion regarding the Excalibur output - Graham is correct 
that I have a pre-production board.

You need a 3.3v square wave to drive the AUX_CLK input on Mercury - the sine 
wave output from Excalibur is not suitable.

I don't see any reason why using C16 connected to the AUX_CLK would not 
work.  The FPGA code looks for the PLL locked signal so when present it will 
select the correct source - either PLL or conventional divider.

As I mentioned, take care if you solder to the AUX_CLK on Mercury - if the 
Locked LED does not light then either you either have no 10MHz or you have 
blown the pin on the FPGA.

Using the PLLs has no decremental effect on the performance of Mercury.

73's Phil....VK6APH



----- Original Message ----- 
From: "Joe Martin K5SO" <k5so at valornet.com>
To: <hpsdr at lists.openhpsdr.org>
Sent: Sunday, November 22, 2009 9:24 AM
Subject: Re: [hpsdr] Mercury V2.9 available


> ***** High Performance Software Defined Radio Discussion List *****
>
>
> Following a suggestion from Graham KE9H I am now using the square wave
> Excalibur output on C16 of the Atlas bus to drive JP8 on Mercury (by
> directly wiring C16 of the Atlas connector on Mercury to JP8 on
> Mercury) instead of using the sine wave output of the Excalibur board
> to drive JP8 on Mercury.  Frequency accuracy performance is within 1
> Hz on all bands but I still do not have a 10 MHz lock indication on
> Mercury LED 4 so I'm not sure at this point if I have dueling 10 Mhz
> sources somehow, preventing a PLL lock on the 10 MHz clock.  Comments?
>
> In any case, the frequency accuracy is nevertheless very impressive.
>
> 73,  Joe K5SO
>
>
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