[eagle] Re: More Information
John B. Stephensen
kd6ozh at comcast.net
Tue Oct 23 11:43:42 PDT 2007
This is useful information. I should be able to get the biggest power dissipators within an inch of the edge so temperature rise may managable without extra heat sinking. I received the SAW filter test boards yesterday, so after the tunable filter matching circuit is validated, I can think about the next version of the receiver.
I won't be at the meeting as I have to limit my travel. My mother has Alzheimer's disease and there are only so many times that I can place her at her sister's house or my brother's house.
----- Original Message -----
From: Dick Jansson-rr
To: John Stephensen
Cc: AMSAT Eagle
Sent: Sunday, October 21, 2007 18:11 UTC
Subject: More Information
This will be my concluding note on this subject prior to the Symposium. I have tuned the analyses done yesterday and that data follows.
For a single 1.4mil ground plane with a single IC located 52mm from the Baseplate edge, a 1.0W dissipation results in a temperature rise of 38.2°C
For a double 1.4mil ground plane with a single IC located 28mm from the Baseplate edge, a 1.0W dissipation results in a temperature rise of 21.1°C.
For a double 1.4mil ground plane with TWO ICs, spaced 40mm and both located 28mm from the Baseplate edge, a 1.0W dissipation in each IC results in temperature rises of 26.1°C (one at 26.0 and the other at 26.2). Total dissipation here is 2.0W.
In other words, doubling the ICs, with this spacing, only added ~24% to the temperature rise. This shows you how this module design handles the kind of power situations that you have in the URx.
See you in Pittsburgh?
Dick Jansson, KD1K
kd1k at amsat.org
kd1k at arrl.net
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