[hpsdr] Call for comments - EXCALIBUR

[John Ackermann N8UR]

Hi Graham --

This looks very good.  A couple of thoughts:

1.  I'm glad to see the 22 ohm resistors in the 74AC04 parallel scheme. 
  That should be ample to protect the output stages per our earlier 
conversation.

2.  If there's room on the board, it would be nice to add the footprints 
for an optional low pass filter and possible buffer stage to convert the 
10 MHz output signal to a sine wave.  While most devices these days will 
take a square wave, there are some cases where the sine is preferred. 
Just a few poles of LPF with a cutoff just above 10 MHz followed by a 
simple emitter follower would do the trick.

Great job!

John
----

Graham / KE9H said the following on 02/23/2009 05:13 PM:
> ***** High Performance Software Defined Radio Discussion List *****
> 
> All:
> 
> If you might be interested in a card to hold a "medium performance"
> 10 MHz TCXO, or to inject a signal from an external 10 MHz reference 
> standard
> onto your HPSDR Atlas bus, please download and read and comment
> on the attached proposed "Excalibur" project card.
> 
> I am assuming this would be available as a bare card or parts
> kit.
> 
> Download proposal:
> *http://www.hamsdr.com/dnld.aspx?id=956*
> 
> Is this something worth setting up as an HPSDR offering?
> Would you be interested in purchasing/building one?
> Anything missing?
> Other comments?
> 
> Thanks,
> --- Graham / KE9H
> 
> ==
> 
> 
> 
> 
> 
> 
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