[eagle] Re: Receiver Spec vs. ATP, a few Suggestions and a Question or Two
John B. Stephensen
kd6ozh at comcast.net
Sat Jul 28 14:22:06 PDT 2007
Isn't the issue the rate of change of the temperature of the baseplate?
The minimum storage temperatures for most components is -65 C and the SAW filters are -40 C.
----- Original Message -----
From: Dick Jansson-rr
To: juan-rivera at sbcglobal.net ; 'John B. Stephensen'
Cc: 'David Smith' ; 'Dave Black (Work)' ; 'Dave Black (Home)' ; eagle at amsat.org ; 'Samsonoff at Mac. Com' ; 'Juan.Rivera (Work)'
Sent: Saturday, July 28, 2007 18:32 UTC
Subject: RE: [eagle] Receiver Spec vs. ATP, a few Suggestions and a Question or Two
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.
Dick Jansson, KD1K
kd1k at amsat.org
kd1k at arrl.net
From: eagle-bounces at amsat.org [mailto:eagle-bounces at amsat.org] 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); eagle at amsat.org; Samsonoff at Mac. Com; Juan.Rivera (Work)
Subject: [eagle] Receiver Spec vs. ATP, a few Suggestions and a Question or Two
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.
Juan - WA6HTP
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