Thanks Don: I bought this unit unbuilt from another list member and it is a very early model. It has no vent holes at all !
I am driving with low power and therefore have the attenuator resistors bypassed. So not worried about heat from that area. I do have the feet on the transverter so air flow under it is good. My concern stems from a reduction of output power after using the unit non stop for a period of time. My fear is the power module is getting hot and falling off some. Module was installed using the heat transfer pads correctly located. I did not use heat sink compound. This unit has the old style power module in it ( M57735 ) This predates requirement of setting the PA bias in the XV50. Just thought I would give it a little more air to help my PA live a little longer. :-) Guess I'll drop Gary a note and see if he has a spare set of panels. Thanks again Don and have a great day. 73 Jerry N0JRN On 6/2/2010 10:36:44 AM, Don Wilhelm ([email protected]) wrote: > Jerry, > > There are holes in the top cover that are "supposed" to be positioned > above the attenuator resistors, and the new transverters have holes on > the bottom on either side of the power module. I am looking at a rather > new XV50 right now that has come in to me for repair. The builder did > not position the top cover holes over the attenuator resistors, but the > holes are in the cover. > If you are driving the transverter from the low power outputs, the > attenuator resistors are not used, so that source of heat is a no-op, > but the resistors will heat up if higher power is used to drive the > transverter. > > I do not believe additional ventilation holes are needed in most cases. > If air flow below the transverter is available (do not operate it > without the feet), the cooling is adequate. It seems to me that some > operators get concerned with any heat generation, but in reality, if it > is cool enough you can place your hand on it for more than 30 seconds, > it is not hot enough for concern. > > Earlier transverters did not have the holes in the bottom panel, and > some very early ones did not have the vent holes in the top cover. Yes, > these may need additional vent holes, especially over the ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
