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Re: QCX+ R50, R48 question

 

Hi Glenn. What revision?is your QCX+? My older Rev 2 still used the 1/4 watt resistor at R48. It was increased to 1/2 watt somewhere in the later revisions. If your kit is older you might refer to the instructions for the revision you have. But, R48 was indeed increased in size (ie Heat Dissipation) in later revisions as it runs a little hot.

Having said that, My Rev 2 QCX+ has been running with the smaller wattage resistor for a long time and shows no discoloration to the resistor or the surrounding board area. I'm sure you are fine using it. If you have a 1/2 watt one in your junk box, it won't hurt anything to substitute it.?

73 ... Ron

On Tue, Jul 18, 2023 at 8:53?AM Glenn W2BX <fintronicsusa@...> wrote:
I'm just finishing up my build on a QCX+ 20m.
On page 52 of the assembly manual it mentions R50, the 270 ohm resistor being "larger than the other resistors" obviously a higher wattage rating.
... but the one provided in the kit looks exactly like all the others, (1/4w?).. same with the 270ohm R48 on the front panel..

Maybe this is a leftover comment from a previous rev of the manual?

??

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