This item is a Drake NB7 noise blanker board manufactured in the late 70s early 80s for use in the R7(A) receiver or TR-7(A) transceiver.  These boards come into our hands infrequently, but we get regular request for this board.

The noise blanker is in excellent condition, was tested, and operates as designed by Drake.  It is important to understand that noise blankers do not remove atmospheric noise and that can be disappointing to some expecting such "blanking of noise".  However, that said, these NB7's can be great in dealing with other kinds of annoying noise as steady pulse noises found from many man-made sources such as:

fluorescent lamps

computers and TVs

lamp dimmer switches

halogen lights

automobile ignition

electric motors

other household appliances and household wiring

Like the previous Drake noise blankers, the NB7 actually blanks the pulse noise for the duration of the noise.  Between noise pulses, full gain is restored.  Receiver AGC is only affected by the signal, not by the noise.  This method does not work with random atmospheric noise, but is great at removing other pulse noise.  In those situations, the blanker can actually either completely eliminate most of the annoying noise or at least reduce it sufficiently enough to be able to copy the signal.  For stronger signals, this is less important.  But for weak signals, this blanker can mean the difference between reception of the signal or the loss of it. 

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Those buyers living outside the USA are also welcome to purchase from us.  We have shipped to 112 countries during the past 24 years on Ebay and we are happy to ship virtually anywhere in the world.  You may use the shipping calculator to determine your shipping cost.

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