[hpsdr] Mercury A/D

[Dan Babcock]

Hi Frank,

Before you become too concerned about the LTC2208 temperature, please take a look at the data sheet.  http://www.linear.com/product/LTC2208  Yes, the part is hot to the touch, but it was fabricated to operate that way. This topic was covered some years ago in great detail on this reflector.  AFAIK, there has never been a failure of an LTC2208 due to overheating.

73,

Dan N4XWE



________________________________
From: FRANCIS CARCIA <carcia at sbcglobal.net>
To: hpsdr at lists.openhpsdr.org
Sent: Tuesday, August 9, 2011 7:12 PM
Subject: [hpsdr] Mercury A/D

***** High Performance Software Defined Radio Discussion List *****



hi everyone,
I purchased a second Mercury a few weeks ago and have been very concerned with the A/D temperature rise with no heat sink. I picked up some 8-32 x 1/2 inch brass flat head screws. I tinned the screw flat side and the A/D thermal pad. Then heated the screw until there was flow between them. I found a couple TO66 sized u shaped heat sinks and opened up one hole to accept the 8-32 screw and attached it with a couple nuts. I just ran the radio a couple hours and was surprised at how warm the hunks of aluminum got. It is in the 80s in the shack tonight. I'm thinking the surface area is around 3 square inches per side, I think this temperature rise is acceptable but the heat sinks stick out of the top of the pandora chassis so need to find a configuration that fits inside. I may do an l bracket to attach to the Pandora lid which would also hold the boards more stable. 
Diversity is really cool, but my 3 amp 5 volt supply needs a fan to keep it from cooking.
I'll be changing out the power supply modules soon. I picked up a couple nice linear modules on ebay large enough to handle 3 Mercury receivers.  I down sized the 12 volt 3 amp supplies to 1.2 amps to make room for the larger 5 volt module. frank WA1GFZ 
_______________________________________________
HPSDR Discussion List
To post msg: hpsdr at openhpsdr.org
Subscription help: http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
HPSDR web page: http://openhpsdr.org
Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/attachments/20110809/16401015/attachment-0004.htm>