Com-Power CGO Series Gebruiksaanwijzing - Pagina 8
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Comb Generators model CGO‐520
Theory
The Comb Generator uses an impulse to generate its step frequency output. It uses a stable power supply and
signal shaping circuit to obtain relatively stable signal output with frequency components extending beyond 1 GHz.
The Comb Generator operates on battery power. The battery output is controlled by a voltage the regulator circuit
to provide stable power output to the signal generating circuit. The signal generating circuit consists of a clock
generator, impulse generator, wave shaping circuit and output matching. The signal frequency is generated by a
crystal oscillator.
An impulse in time domain corresponds to a flat output across the entire frequency spectrum in frequency
domain. An ideal impulse, by definition is an infinite magnitude pulse with zero rise and fall time with zero
duration. Such a pulse is not practical; however, the Model CGO‐520 Comb Generators use this principle to get an
output across a wide band. The highly stable frequency output from the oscillator is used to generate an impulse
with very short duration and sharp rise and fall times. The shaping circuit was designed for improved stability,
extended frequency response, and output impedance matching to 50 ohms.
The radiated reference signal is transmitted by the antennas affixed on top of the unit. An electrically short
monopole antenna is an antenna that is short compared to the wavelength of the frequency it radiates. Such an
antenna generates a radiated field proportional to its length. The radiated field, therefore, compensates for
decreasing signal up to a frequency, where the antenna cannot be called electrically short. This theory describes
the general behavior of the field, but each Comb Generator may behave slightly different than the other due to
circuit variation. Since the Comb Generators were designed to provide a reference reading at a given frequency,
this limitation is not a problem.
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Rev. 0216