[hpsdr] Cooling Requirements?

[Keith Hornbaker]

Hi
I had looked at the small dc-dc power supplies but couldn't find any info
about how much noise they may generate. I thought they may be an update of a
chopper regulator circuit which I had checked a while back and found they
did generate some noise. Has anyone used one with RF stuff? I really like
the size and power input requirements. Thanks for the info

-----Original Message-----
From: kd5byb at bellsouth.net [mailto:kd5byb at bellsouth.net] 
Sent: Thursday, March 15, 2007 2:41 PM
To: Keith Hornbaker; hpsdr at hpsdr.org
Subject: Re: [hpsdr] Cooling Requirements?

Hey Keith,

Looking at cooling is one of the things on my "to do" list for the design of
the not yet proposed Pandora enclosure concept.

So far, I don't think that the Ozy and Janus cards are going to draw a lot
of power, so an ATX cooling supply fan is probably sufficient.

This could change if future cards use a lot of power.  But, it is probably
worth mentioning that some folks here are looking at www.mini-box.com pico
ITX power supplies that are 120 watt supplies at near 90% efficiency.  If
all that 120 watts becomes heat, that might be a problem for an ATX fan.

When I get back in town (on road right now, wife in hospital about two hours
from home) I'll do a quick analysis with a 120 watt heat load and assuming
about 20 CFM airflow in a 70 degree room.

thanks and 73,
ben, KD5BYB


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