1975-10-24
1976-12-28
Safourek, Benedict V.
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.
Bell Telephone Laboratories Incorporated
Safourek Benedict V.
Tobe Russell H.
LandOfFree
Automatic repeater stressing does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Automatic repeater stressing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic repeater stressing will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-150768