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

I recently had the opportunity to acquire a Cubic Communications CDR-3250 VLF-HF Communications Receiver (two, in fact), fully functional, in very good condition. This is a very high quality, mil-spec receiver using DSP for the final IF, giving a large selection (51 possible, depending upon the mode) IF filters. It is stable, selective and has one of the best menu systems I have used in a receiver. Also the the audio quality and audio recovery is the best I have heard this side of a tube radio like the R390A or SP600JX. Oh yes, stereo headphones work (mono in both ears) properly from the headphone jack.

The receiver incorporates a small box fan in the rear of the chassis to pull air through cooling the modules and power supply (also at the rear). … Read More »