1、MIL-I-L453A (1) 57 9977706 0076965 7 W r- 0L-d.f MIL-I-81453A (AS) Amendment - 1 31 October 1978 MILITARY SPECIFICATION , Page 25, paragraph 3.5.2.3.2, Delete and substitute: INTERROGATOR SET AN/APX-76B(V) This amendment forms a part of Military Specification MIL-I-81453A(AS) dated 10 June 1977 and
2、has been approved by the Naval Air Systems Command, Department of the Navy. Title: Set ANIAPX-7 6B (V 1 I Delete “Interrogator Set AN/APX-76A(V) and substitute “Interrogation Page 1, paragraph 1.2, Classification: Delete “RT-868A/AFX-76(V) and substitute “RT-868B/APX-76 (V)“. Delete “RT-988/At and s
3、ubstitute “RT- 988A/A“. Make this same change throughout the specif ication. Page 5: Delete “MIL-STD-781“ and substitute “MIL-STD-781B“ Page 7: Add new paragraph: “3.2.4 Electron Tubes - Electron tubes shall not be used except for the single tube amplifier in the switch-amplifier SA-1568A/APX-76(V)“
4、. Page 7, paragraph 3.3.3.1 Operational Stability: Delete “225“ and substitute “400“. Page 8, paragraph 3.3.3.3 Equipment Reliability in Mean Time Between Failures (MTBF) : Delete “225“ and substitute “400“. Add: “The speci- fied FITBF of the RT-988A/A is 560 Hours“ Page 8, paragraph 3.3.3.3.1, Dele
5、te and Substitute: “3.3.3.3.1 Reliability of Individual Items - Items for system calculations of 400 hours MTBF: C-7383/APX-76 (V) RT- 868B/APX- 7 6 (V 1 SA- 15 6 8A/APX- 7 6 0) SN-416A/APX-76 (V) 47,600 hours 560 hours 2,370 hours 3,680 hours “3.5.2.3.2 Transmitter Power Output - The transmitter sh
6、all be capable of delivering not less than 1500 watts, peak rf power (as averaged over an rf pulse) to the antenna front panel jack of the RT-868B/APX-76(V) aver the entire range of environmental conditions specified herein at a frequency of 1030 M.2 MHz and at any duty cycle up to a maximum of 0.6
7、percent. At the extreme temperatures under specified environmental con- _. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- - MIL-I-LY53A (1) 57 W 777790b 007b7bb O W MIL-I-81453A (AS) Amendment - 1 ditions a 1dB drop in output power will be acceptab
8、le. (para 3.3.11) the specified operation at a duty cycle up to a maximum of 1 per- cent shall be provided. Operating tests for demonstration of equipment life and reliability shall be carried out at a maximum duty cycle of 0.6 percent. An adjustment shall be provided capable of reducing the transmi
9、tter power output by 3 51 dB in order to be able to suit the needs of a specific installation. This reduction in transmitter power shall be accomplished without degradation of receiver sensitivity. by hot switching of an associated rf switch.“ Under standard conditions The transmitter performance sh
10、all not be affected Page 27, paragraph 3.5,2.6.2(1), line 4: Delete tlswitchll and substitute li adj us tment . Page 29, paragraph 3.5.2.9 Controls, line 4: output in two steps of 2 +1 dB each“ and substitute, “Not Used. in highest power positionn. Delete “Shall reduce the power Maintained Preparing Activity NAVY-AS Project No. 5895-273 - *I f Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
