The Atomichron is one well known outgrowth of National's pioneering work in
quantum mechanics and nuclear phenomena. The world's most accurate
commercial primary frequency standard, the Atomichron utilizes the
unvarying resonance of the cesium atom to achieve stability for the life of
the equipment of five ten-thousansths of one cycle at 10MC. The Bureau of
Standards, which broadcasts WWV standard frequency transmissions, employs
National's Atomichrons.
National's Digital Data Interpreter, developed for the National Security
Agency. Used to convert radio signals to digital form for encoding and
decoding.
The NC-400 provides crystal or manual control of all oscillators, external
synthesizer inputs, diversity provisions, and bandwidths up to 16Kc! A
typical application of the NC-400 is its use in the nationwide F.B.I.
radioteletype network.
National's drift-cancelled AN/WRR-2 is the U.S. Navy standard shipboard SSB
receiver. The most stable military communications receiver in use, WRR-2
stability is equal to one-tenth of one cycle at 10Mc! Designed primarily
for SSB use, the WRR-2 can simultaneously receive two different types of
intelligence on independent upper and lower sideband channels.