I would try to improve the heatsinking. The case provides a lot of area to dissipate the heat but it has to funnel all that heat through fairly thin sheet metal. I would attach a largish finned heatsink on the outside. This will give it a thicker chunk of metal to conduct the heat away and much more surface area, close to the source, to dissipate the heat. It needs to have good metal to metal contact (with a thin layer of thermal grease between) with the metal case. Ideally the PA transistor would be attached directly to the heatsink through a hole in the case.
Clark Martin
KK6ISP
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On Jun 8, 2017, at 8:25 PM, Jeff <jeff@...> wrote:
Ok finally got the Vox board adjusted and hooked up the laptop power supply. I have about 19v on the PA and am getting about 9-10 watts out. Plugged in the computer this evening and was able to make several contacts on PSK31. Seems to be working fine my only concern is the PA is getting pretty warm even though it is heatsinked to the rear case. I will have to watch it closely and see what happens.A fan may be in order. Thanks to all for the guidance.
