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TOPIC: SDR@ Pro Cooling

SDR@ Pro Cooling 11 Apr 2021 16:54 #1

  • K4MT
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I noticed that even in receive the heat sink gets rather warm. What I did was to get a 12 volt 4 inch square fan and pot a 50 ohm 5 watt resistor in series with it and ran it to my 13.8 radio power supply. Did not want to connect fan to rear connector on radio. With the resistor the fan makes hardly any noise. I then attached 4 stick on rubber feet to the corners of the fan and sat it on top of the heat sink with it blowing upward to remove heat from heatsink. Radio temp as didplayed on Expertsdr2 went way down and now heatsink is cool.

This may not be needed but I like to see electronics run as cool as possible for long term reliable operation.

Gary K4MT
Gary K4MT
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SDR2 Pro Cooling 12 Apr 2021 09:17 #2

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sorry for typo meant SDR2Pro
Gary K4MT
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SDR2 Pro Cooling 14 Apr 2021 12:45 #3

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One follow up. I ran digital modes and RTTY for 2 hours straight. In the past the heat sink was very hot after even 10 minutes of this type of operation. With this fan running all the time the radio temperature stays at 29 C and after 2 hours of almost non stop stransmit the temperature only increased to 31 C.. I am certain that keeping the temperature under control will keep the radio running even longer without any failures.

Gary K4MT
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