My heatsink appears to have a thermal resistance of about 3 degrees C per watt. It is similar to Thermalloy 60975.
I will dig deeper into the junk box and see if I can find a heatsink with larger fins. Thanks for the guidance. 73 Glenn WB4UIV At 11:50 PM 1/11/2009, you wrote: >Glenn Little WB4UIV wrote: > > I have a LPRO-101. Before I power it up, I have been advised to > use a heatsink. > > How large of a heatsink do I need? > > I found an extruded heatsink in the junk box. > > This heatsink has fins about 0.50 inches high. > > The width is 2.375 inches wide. > > It is 8.125 inches long. > > I plan to cut this heatsink in half giving me two 4.0 inch pieced. > > I plan to bolt each piece to the bottom of the LPRO-101, using the > > six mounting holes, three per heatsink. > > Would this be sufficient heatsink? > > > > Thanks in advance. > > 73 > > Glenn > > WB4UIV > > > > > > > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > > >Glenn > >The manual recommends a heat sink with a thermal resistance of 2C/watt >or less for ambient temperatures up to 50C. >Your proposed heatsink may be a little small unless you bow it. > >Fin orientation is very important for an non blown heatsink. >If you just attach the heatsink to the base with the fins pointing down >the thermal resistance will be increased significantly over the normal >orientation with convection cooling. > >Bruce > >_______________________________________________ >time-nuts mailing list -- time-nuts@febo.com >To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.