BHI NES10-2 DSP Speaker Unit

 BHI NES10-2 DSP Speaker Unit

NES 10-2 DSP UnitSpec
Fully Adaptive noise cancelling with on/off switch
Noise cancellation 9 – 35dB through 8 user selectable noise cancelling levels
Greatly improved signal to noise ratio
3.5mm headphone socket
Sturdy case with adjustable monting bracket
12 – 24Vdc operation

It’s absolutely marvellous! VK stations on 20m with s2 signals at about the same level as the noise floor were perceptible but unreadable but now I can copy them 52. You just turn the box on and after a couple of seconds all that horrible hash disappears just leaving the station you want to listen to.

Noise cancelling can be varied between 9 and 35db by DIP switches on the back. I run the unit at fairly low levels of cancelling – this is easier to work with in QSOs as the NES 10-2 can take a little time, 2-3 seconds, to adjust at high levels of cancellation. You can also get a water-fall effect at high levels which is strange to hear but still effective.

Feedback problems
The NES 10-2 is susceptable to RF feedback which can be a real problem…usually when working DX of course! Tony, G0DLX, found a solution to this – provide a seperate power supply from the shack supply. I tried this and found it improved matters enormously. A random power supply was pressed into service with some resistors to bring the voltage down to supply all the shack audio devices – BHI NES 10-2 and Datong FL-3 filter.
step down resistors