1、MIL-R-81443 (AS) Amendment 2 28 March 1468 Superseding Amendment 1 28 September 1967 MILITARY SPECIFICATION RECEIVER-TRANSMITTER, RADIO RT-793/ASQ and RT-793A/ASQ This amendment forms a part of Military Specification MIL-R-81443(AS) dated 15 Aug. 1966 and has been approved by the Naval Air Systems C
2、onmiand, Department of the Navy. I Page 1, Specification Title: Page 1, Paragraph 1,l: Add Delete and substitute the title of this amendment “(5) in conjunction with Juliet-28 equipment.“ Communication by nieans of AM radio telephone (A-3) when used Page 1: Paragraph 1.2: Add “Jul iet-28 equipment“
3、“Control , Radi o Set C-8057/ARC“ Page 6, Paragraph 3.4.3: Add “When an RF input of 4 microvolts, (open-circuit) modulated 30% at 1000 cps is applied, the signal plus noise-to-noise ratio of the auxiliary audio and the auxiliary guard audio shall be 6 db or greater.“ Page 6, Paragraph “The be : Page
4、 7, Paragraph “The when 3.4.5: Add overall selectivity of the RT-793AIASQ fr use with Juliet-28 shall 6 db 80 kc min. 60 db 150 kc max.“ 3.4.8.1: Add auxiliary guard audio shall have an output of 0.15 to 0.45 volts terminated with a 600 ohm load for any inout level between 10 and 10,000 microvolts m
5、odulated 30% at lOO cps.“ Page 7, Paragraph 3.4.8.3: Delete and substi tute “Auxiliary Circuit - The auxiliary circuit shall deliver only signals de- tected by the variable frequency receiver. When a 1000-microvol t signal modulated 30% at 1000 cps is applied, the output shall be at least 0.25 volt
6、for a 20,000 ohm resistive load, and when the modulation frequency is varied from 70 to 7000 cps , the outDut for any frequency in the range shall be within 2 3 db of the output obtained at 1000 cps. The response of the RT-793A/ASQ,.for use with Juliet-28, shall not vary more than +4 FSC 5821 I . Pr
7、ovided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-*lIL-R-81443(AS) Amendment 2 Page 7, Paragraph 3.4.8.3: Delte and substitute (Continued) to -4 db from that obtained at 1000 cps, when the input is varied from 70 cps to 20,000 cps.“ Page 7, paragraph 3.4
8、.9: Page 8, Paragraph 3.4.1 1.1 : Change the third sentence “3 db“ to “5 db“. Change fourth paragraph “the transmitter to “the RT-793/ASQ.“ Add last sentence. “Modulator response for the RT-793A/ASQ for use with Juliet - 28. . Frequency cos 1 O0 300 GOO 1 O00 3000 6000 10,000 20,000 Relative Output
9、in db -5 or lower t4 to -4 t4 to -4 - O (Ref. level) t2 to -2 t3 to -3 t4 to -4 t4 to -4“ Page 9, Paragraph 3.4.14: Add “The auxiliary audio, and the auxiliary guard audio shall have a signal plus noise-to-noise ratio of at least 20 db when a 1000 microvolt sig- nal modulated 30% at 1000 CES is appl
10、ied.“ *Page 9, Paragraph 3.4.17: Delete “100 n!illiseconds“ and substitute “200 miliseconds“. Page 14, Paragraph 3.5.1.10.3: Add “The auxiliary pard output shall be terniinated in a 600 ohm nonreactive load which shall include means for measuring the audio outwt voltage.“ “Dynamic Mike Input“: Page
11、14 , Paragraph 3.5.1.1 O. 4 , under “Carbon Mi crophone InDu t“ and under Delete “150 - 10,000 cps“ and substitute “150 - 20,000 CPS“. Page 14, Paragraph 3.5.1.10.4: Add “1.0 VR?S open circuit must be supplied when the RT-793A/ASQ is used with Juliet equipment.“ *An asterisk preceding a page number denotes a change to be made to the specification which did not appear in the preceding amendment. * U. S. GOVERNMENT PRINTING OFFICE: 196&301-519/5966 - 2- - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
