Juan:

I do not know how you can be concerned with storage temperatures of -60°C when you have just soldered a PCB with temperatures of from two to a a few hundred degrees! It seems to me that the stress of soldering would vastly exceed those of a low storage temperature. The thermal excursions of soldering considerably exceed those of the storage situation.

’73,

Dick Jansson, KD1K

[email protected]

From: [email protected] [mailto:[email protected]] On Behalf Of Juan Rivera
Sent: Saturday, 28 July, 2007 05.23
To: 'John B. Stephensen'
Cc: David Smith; Dave Black (Work); Dave Black (Home); [email protected]; Samsonoff@Mac. Com; Juan.Rivera (Work)
Subject: [eagle] Receiver Spec vs. ATP, a few Suggestions and a Question or Two

John,

· (snip)

I also take issue with the -60C minimum power-down temperature. I think this is unrealistic just from a CTE mismatch perspective. The reliability of anything subjected to that wide a temperature spread is going to suffer. A way must be found to raise that temperature.

(snip)

73,

Juan – WA6HTP