Cubic Communications CDR-3250 VLF-HF Communications Receiver Fan Noise Solution Part II

This post will furnish additional detail about installing a quieter and more efficient rear panel fan in the Cubic Communications CDR-3250 VLF-HF Communications Receiver.

As I mentioned in the previous post, the duct/standoff/adapter can be made from wood. I chose solid pine because I had some in my offcuts box; plywood would be a good choice too.

The dimensions of the duct are: 75mm H x 60mm W x 15mm D as shown:

The holes are 55mm diameter (fan side) and 45mm diameter (receiver grille side). The hole on the receiver side had to be smaller in order to accommodate the 42mm bolt hole pattern of the OEM fan, while leaving enough material around the fastener holes for a sound mechanical joint. In addition, I happened to have 45mm and 55mm hole saws … Read More »