The wall anchors I used are 1-1/4" long and use #10 or #12 screws.
The fan mounting holes passed #8 screws,
so I had to drill them out slightly to take #10 screws.
I also needed to cut off about ¼" of the length of the wall anchors.
Keep your IC-706/MKII/MKIIG Cool! Phil Salas - AD5X (ad5x at arrl dot net) The ICOM IC-706 series of radios is very popular for mobile and portable operation. However, a lot of heat is generated in this small package, and with moderate-to-heavy use, the radio and heat-sink can get quite hot. The way around this is with additional air-flow around the heat-sink. This project had three goals - First, I needed to solve the heat problem. Second, the solution should not be obtrusive. And third, I didn't want there to be any mechanical changes necessary to my IC-706MKIIG. There are about a zillion surplus computer fans that are available for very little money, so I figured that there had to be one that was perfect for adding to the IC-706G. I wound up using a 12-volt 50mm square fan available from All Electronics (www.allelectronics.com, part number CF-162 @ $4 each). This fan comes attached to a heat-sink, which you won't use. Now the trick was figuring out how to mount it to the IC-706G heat-sink. The answer turned out to be pretty simple. Click on the photos for a larger picture.
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I used plastic wall anchors to hold the fan in place. The wall anchors I used are 1-1/4" long and use #10 or #12 screws. The fan mounting holes passed #8 screws, so I had to drill them out slightly to take #10 screws. I also needed to cut off about ¼" of the length of the wall anchors. |
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You'll probably need to rotate the fan assembly to get the wall anchors
to align with the necessary heat-sink fins. Then just tighten down the #10 screws. Also, orient the fan so that it blows air away from the IC-706 heat-sink. |
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This fan draws 70 milliamps, so I took the necessary 12-volts off the
accessory connector on the IC-706G. Pin 8 (gray wire on the supplied connector) is +12V, and pin 2 (red wire on the supplied connector) is ground. The maximum current available at this connector is one-amp. |
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To protect the radio in case of a fan short, I connected a 33-ohm 1/2-watt resistor in series with a fan lead along with a 0.25 amp fuse. The resistor drops the fan voltage a bit, which makes it run very quiet. The fuse I used was a ¼-amp pico fuse (www.mouser.com part number 504-MCR-1/4 @ $1.03 each). Both the fuse and resistor are covered by heat-shrink tubing.
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As an alternative, you can take +12V and ground from the antenna tuner
connector on the back. |
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