Automatic repeater stressing

Patent

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Details

325 62, H04B 160

Patent

active

040004678

ABSTRACT:
The downconverter in a digital radio repeater is normally connected to a bias which causes the converter to perform at optimum efficiency in developing an intermediate frequency (IF) signal. This IF signal is then processed in an IF section which is gain controlled by an automatic gain control (AGC) signal. The AGC signal is compared with a reference voltage to develop an error signal which is in turn amplified to produce a stressing bias voltage. During periods of repeater testing a remotely originated command signal causes a switching circuit to be activated resulting in the application of the stressing voltage to the downconverter in place of the normal bias. As a result a predetermined signal-to-noise ratio is established in the digital repeater regardless of variations in the input signal level due to differences in repeater spacing or atmospheric conditions.

REFERENCES:
patent: 3440539 (1969-04-01), Hamming
patent: 3898564 (1975-08-01), Waldhauer et al.
Transmission Systems for Communications, 4th Ed. Revised, Section 8.4 Dec. 1971, "Noise and PCM Signals" FIG. 8-13, pp. 215-219.

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