[Hpsdr] Call for Comments - ALEX

[Chris Albertson]

I've been trying to figure out how to build something like this too.
You have some good ideas.  For example "no clocks or oscillators
running on the boards".  I was going to use a micro-controller
but that implies a clock.  I think I'll move it outside of the
shielded enclosure.

The Eurocard size looked good to me too
they fit inside those extruded aluminum boxes.  You could loose
the 10 standoffs and use the card guides in the extruded box to hold
the cards.   The box is completely RF tight.  You could mount BNC
connectors on the box's end panel and then use BNC jumpers to route
the signals to user supplied connectors on his HPSDR enclose.
Use PC mounted BNC connectors that protrude through holes drilled
in the end panels.  There is no need for the "shield board" if the
rx and tx boards go inside a box.

These boxes work well and don't add much cost when you concider
you will not need the shield card.  
http://www.nutech-eng.com/english/enclosurecases/cases/product/e006.asp

I think the product is much more appealing if it is self contained
inside
its own enclosure.    An SPI controlled
"pre-selector brick" would find use outside of HPSDR.

Is the TR Relay fast enough to keep up with someone sending
CW at a high rate?  

It would be good if these were designed so it could be hand soldered.
A 0.05 inch lead pitch is easy for most people


Chris Albertson
  Home:   310-376-1029  chrisalbertson90278 at yahoo.com
  Office: 310-336-5189  Christopher.J.Albertson at aero.org
  KG6OMK/AG


       
____________________________________________________________________________________
Need a vacation? Get great deals
to amazing places on Yahoo! Travel.
http://travel.yahoo.com/

 1185331600.0