1、MIL-R-BLbZB (2) 58 M 7797706 013Lbb5 L m MIL-R-81b38B (AS) AMENDMENT 2 .- CIJPERSED ING AMENDMENT 1 1 MARCH 1976 MILITARY SPECIFICATION RADIO SET AN/ARC-143B This amendment forms a part of Military Specification ML-R-81628B (AS) Of 1 April 1974, and has been approved by the Naval Air Systems Command
2、, Department of the Navy. Page 20, paragraph 3.5.1.5.9.3.1.: Delete and substitute “3.5.1.5.9.3.1 Level - For a 1000 microvolt signal deviated 20 KHz peak at a modulation rate of 1000 Hz, the FM data output shall bc 2.81 volts rms 2ldB. Under service conditions, the FM output shall be 2.8: Volts rms
3、 +3, -2dB in response to the same input signal at ambient tmp- eratires below 2OoC. I Page 28, paragraph 3.5.1.5.9.3.6.: Delete and substitute “3.5.1.5.9.3.6 Response - From 300 to 3000 Hz, the audio response to an input signal deviated 20 KHz shall not vary more than +2dB with a reference of 1000 H
4、z. I Page 31, paragraph 3.5.1.7.1.: Delete and substitute “3.5.1.7.1 RF Power Output - The transmitter shall be capable of producing into a 50 ohm resistive loa9 30 watts of m.1 carrier powcr, - +2 db, and 100 watts of FM carrier power, +2 db, -0 -0 service conditions. Automatic level control shall
5、be used to limit the variation in output power to within 2 db peak-to-peak across the frequen- cy band. I under standard and Page 33, paragraph 3.5.1.7.6.2.1.: Delete and substitute “3.5.1.7.6.2.1 - Level - The FM modulator shall be adjusted for a peak deviation of 520 KHz with an input signal level
6、 of 2.81 volts rms - + 1 dB at a modulation frequency of 1000 Hz.“ Page 33, paragraph 3.5.1.7.6.2.2.1.: Delete and substitute “3.5.1.7.6.2.2.1 Frequency - From 300 Hz to 3000 Hz, the input Sig- nal required to producr20 KHZ deviation shall not vary more than - +2dB from that of a 1000 Hz reference.“ Preparing Activity:Navy-AS Project No, 5821-NL39 FSC 5821 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
