[hpsdr] Atlas First Light

[Christopher T. Day]

Lyle,

2) I kind of agree with you myself, but the last go-round argued for one
of the sides so the board length was not really limited. Your argument
for card guides is a good one, though, I think.

BTW, regarding which way the component side faces - Eric - remember that
the right-angle headers displace the board relative to the center of the
DIN connector. As PhilC had his card installed, the board is on the left
edge of the connector. This looks fine to me. Besides, we may have
components on both sides of some cards eventually. And even my argument
for the bottom edge for I/O connectors isn't all that strong. But we
_do_ have to agree on something.

3) The hardware at least helps keep the connector snug against the board
while soldering. And besides, how are your card guides held on?


	Chris - AE6VK


-----Original Message-----
From: Lyle Johnson [mailto:kk7p at wavecable.com] 
Sent: Sunday, April 23, 2006 6:07 PM
To: Christopher T. Day
Cc: hpsdr at hpsdr.org
Subject: Re: [hpsdr] Atlas First Light

...

> 2)     I think I/O connectors should go on the edge of Atlas daughter 
> boards that is away from the power connector...

I prefer they go on the edge that is opposite the DIN connector. If you 
want to use card guides, for example.

> 3)     2-56 hardware seems good for attaching the DIN connectors... 
> Screws, lockwashers and nuts ought to go on the BOM...

With 96 pins soldered to the backplane at each connector - or even 64 --

I doubt any hardware is needed.  No harm in using hardware, of course, 
but I suspect it won't add much in the way of strength or protection. 
It ought to be very stiff along the line of the connector.

Looks good, Chris. Hope the VNA tests go well!

73,

Lyle KK7P



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