Patent
1974-12-04
1976-06-22
Safourek, Benedict V.
325 67, H04B 1700
Patent
active
039654249
ABSTRACT:
A method for tracking an incrementally sweeping generator by a frequency selective receiver is disclosed. A sequence of test signals is generated each of which has a discrete and different frequency which is periodically and incrementally modified according to a program, and the dwell time of each frequency is sufficient to obtain at least two receiver measurements. This sequence of test signals is supplied to a device under test, and the output signals from the device under test are fed to the frequency selected receiver which operates at one of the discrete frequencies supplied according to the program. The operating frequency of the receiver is modified according to the same sweep program and with at least the same sweep rate. The levels of at least two consecutive measurements at the receiver output are compared with at least one reference value which is selected such that it discriminates against other signals that are not part of the sweep program. The receiver frequency is then maintained at a constant value as long as the comparison indicates that the signal level is below the reference level, and the receiver is released to follow the sweep program as long as the comparison indicates that the signal level at the receiver output is equal to or greater than the reference level.
REFERENCES:
patent: 3110861 (1963-11-01), Hurvitz
patent: 3842247 (1974-10-01), Anderson
patent: 3895303 (1975-07-01), Imazeki et al.
Coackley Robert
Dack David George
Urquhart John Reid
Barrett Patrick J.
Hewlett-Packard Limited
Ng Jin F.
Safourek Benedict V.
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