Heatsinking is definitely on the light side for continuous duty on these units. Back in the day, when we had one of these repeaters in daily operation, we did it this way....
Punched a 1.25in hole near each end of the transmitter box cover. Mounted a small squirrel cage fan directly to one hole, blowing through the tx box. If you can't find a squirrel cage, a muffin type of fan would work if the hole is large enough. You can maintain shielding integrity by using screening over the holes. This removes a lot of heat, and I still use this trick on GEs today. Under the chassis, where you can see the power transistor mounting studs, I mounted some wide strips of copper on the stud under the nut- sort of a homebrew heatsink directly on the transistor. Then I mounted a 3-4in fan under the chassis blowing directly on the new heatsink. These tricks kept our tx very cool and happy on the longest up-times. Laryn K8TVZ --- In [email protected], "kf4vgx" <[EMAIL PROTECTED]> wrote: > This Repeater was an old kit that was put together last year by a Ham > friend and myself works great ! > But when useing Echolink during a few nets the thing gets to hot ! > I use fans that keep it cool enough but still looking for other ways Yahoo! Groups Links To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
