This Noise Model NS-LB generator was made by Aerospace Research, Inc. of Boston, MA. It uses a 5722 Noise diode tube with a Tungsten filament using the "shot effect" (Wiki). There is a solid state control circuit that varies both the DC filament current and the plate voltage in order to produce a variable excess noise.
The filament voltage needs to be varied from 2.0 to 5.5 Volts while the plate voltage varies from 10 to 200 Volts. The tube is specified up to about 500 MHz, but the construction of this noise generator may go higher.
NF (Noise Factor) = 20 * I * R
NFdb = 10 * LOG10 (20 * I * R)
where: I = Plate current in Amps, R = generator resistance, 50 Ohms in this case.
Type-N male output.
Manual or schematic: Let me know.
This is a very similar noise source where the filament current is
the adjustment that controls the noise output.
According to MIL-HDBK-172A Vol 1: The SG-8 superceeds the TS-195/GP.
Frequency range: 10 to 150 Mc
NF Range: 0 to 30 (50 Ohms)
USAF Spec 7524
This noise generator uses a tube acting as a diode to generate
noise then uses filters and amplifiers to control the noise
bandwidth and level, so is NOT at all similar.
GR 1390 Random Noise Generator Manual -
Test Equipment/Noise Figure
Cryptography makes use of various types of random number
and pseudorandom number generators (Wiki).
The former make use of devices like the above physical noise
generators or radioactive decay while the latter make use of
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page created 13 June 2002.