[hpsdr] Fully enclosed Hermes cooling?

Helmut, DC6NY dc6ny at gmx.de
Fri Jan 4 00:10:59 PST 2013


the 'hotest' spot on the board is the ADC, which can dissipate up to 2000
mW. The layout design of the board seems sufficient to keep the device in
the rated range especially under normal ambient temperature. Anyhow it's a
good idea to take some precautions: I glued a copper RAM heat sink on the
ADC and drilled some holes in the top cover of my ultra flat(30 mm) Hammond
case to allow thermal flow.

HNY and 73, Helmut

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Von: hpsdr-bounces at lists.openhpsdr.org
[mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von John
Gesendet: Donnerstag, 3. Januar 2013 17:34
An: hpsdr at lists.openhpsdr.org
Betreff: [hpsdr] Fully enclosed Hermes cooling?

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

My worries are probably unfounded since the ANAN-10 uses Hermes *and* a 
PA in a small box, but I am still worried that I might damage my Hermes.

I mounted my Hermes in an older CDROM drive case by making aluminium end 
plates and carving up the plastic internal support of the original CDROM 
drive.  With the top cover off I can feel a noticeable amount of heat 
with my hand about even with the top of the case.  There must be about 8 
Watts of heat in that box...      [(13.6 V * 0.6 A) - 500mW]

Will I hurt the reliability of my Hermes by completely enclosing the 
CDROM drive case?  Should I add cooling holes or a fan?  My Hermes is a 
TAPR unit and I don't know if the components are rated the same as the 

John,   WoGN

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