[Hpsdr] Call for Comments - ALEX

[Henry Vredegoor]

Hi Chris, Graham, Phil, All

I agree with Chris that a separate (sub-)enclosure would probably be better
wrt. shielding. 
Or two (three) compartments, separating TX and RX (Control logic)

I don't think the shielding of aluminum is "High Performance" for EMI/HF
signals, at least not for the magnetic field part of it.

Wouldn't a steel enclosure (or any other (soft-)magnetic material) be
better?


73's,

Henry.

> -----Original Message-----
> From: hpsdr-bounces at lists.hpsdr.org 
> [mailto:hpsdr-bounces at lists.hpsdr.org] On Behalf Of Chris Albertson
> Sent: woensdag 25 juli 2007 4:47
> To: Graham Haddock; HPSDR Reflector
> Subject: Re: [Hpsdr] Call for Comments - ALEX
> 
> 
> ***** High Performance Software Defined Radio Discussion List *****
> 
> 
> 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
> 
> 
>        
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