NAVY MIL-T-28842 A (2)-1982 TELEPHONE SETS TA-970 U AND TA-990 U《TA-970 U 和TA-990 U电话机》.pdf

1、* MIL-T-288YZA (2) 58 7997906 DL55150 7 W MIL-T-28842A( EC) -. - AMENDMENT 2 - - _. *: . .: . , -= . .- - _ 25 June 1982 . SUPERSEDING AMENDMENT 1 19 February 1982 . MIL I TARI SPEFI CATION TELEPHONE SETS, TA-970/UY TA-980/UY AND TA-990/U 1, .* I CI _- This amendment forms a part of Military Specifi

2、cation, MIL-T-Z8842A(EC) dated 11 May 1981, and is approved for use by the Naval Electronic Systems Command, Department of the Navy and is available for use by all Departments and Agencies of the Department of Defense. . . . . PAGE 5 ,*- - . .i 3.8.2.1 -b., line 2, after “speaker“: Delete “ampere (A

3、)“. and substitute ,“amplifier“. ._ .- . - 3. 3I8.2.2 b., line 2, after “speaker“: Delete “A“ and substitute “amplifier“. * 3.8.2.3 d., after “(kHz)“ Add: “at +25 degrees Celsius (C). The input impedance may * vary from 520 ohms to 780 ohms over the temperature range of -28 to +65 degrees C.“ 3.8.2.

4、3 e. Delete the text in its entirety.and substitute the following new text:. “15 ohms +lo percent at 1 kHz unbalanced to ground at +25 degrees C. The output imped- ance may vary fFom 12 ohms to 20 ohms over the temperature range of -28 to t65 degrees C.“ PAGE 6 * 3.8.2.3 f. Delete the text in its nt

5、irety and substitute the following new text: .“Flat within “+O dB to -3 d6 from 200 hertz (Hz) to 4 kHz as compared to the response 3.8.2.4 f. Delete the text in its entirety and substitute the following new text: “Flat within +1 dB to -5 dB from 200 Hz to 4 kHz as compared to the response at 1 kHz.

6、 at 1 kHz.“ * The roll off below 200 Hz and above 4 kHz shall be 12 dB +3 dB per octave. 100 Hz and 8 kHz shall be -15 dB maximum.“ The gain at - PAGE 8 * 3.8.2.13, line 2: Delete: “terminal A“ and substitute “pin A“. Second sentence: “The minimum voltage measured across pins A and B with the handse

7、t connected and the Delete in its entirety and substitute the following new sentence: PTT switch depressed shall be 4.75 VDC and the maximum voltage shall be 8.5 VDC.“ PAGE 9 * 3.10.1 a., after “tests“: Delete “CE07“, after “d“ Add the following new item: “e. measurements. II Test methods CE.01, CE0

8、2, REO1, and RE02 shall apply except for switch transient 1 of 3 FSC 5805 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-28842A (2) 58 7979906 0155151 O W MIL-T-28842A( EC) -. . - . . . - -* . 3.10.2 a, after “tests“: Delete “CE07“, after “e“

9、Add the following new item: “fi est methods CEO1, CE02, REO1, and RE02 shall apply-except for switch transient PAGE 10 I measurements.“ .- 4.4.1 Add the following new sentence: “The workmanship screen shall be the first inspection performed.“ PAGE 11 TABLE I. “Workmanship Screen: Delete entry and su

10、bstitute the following: Qual i ty conformance fest article Group Group Group First inspection Examination or test paragraph paragraph inspection A B C “Workmanship screen 3.13.2 4.5.6 X II Requirement TABLE I. “Auxiliary output“: Delete 113.8.2.51 and substitute 3.8.2.10t1. TABLE I. “Crosstalk: Dele

11、te “4.7“ and substitute “4.5.7“. TABLE I. “Humidity“: Delete “4.8l and substitute “4.5.8“. TABLE I. “Shock“: Delete “4.8.3“ and substitute 4.5.9“. TABLE I. Add the following new entry: Qual i ty conformance Requirement Test art i cl e Group Group Group First inspect ion Examination or test paragraph

12、 paragraph inspection A B C “Channel select switch Type II 3.8.1 4.5.2 X X PAGE 12 4.5.3 Delete text and substitute the following new text: “Temperature tests. Temperature tests shall be conducted in accordance with MIL-E-16400 except that lower non-operating temperature for Range 4 shall be as spec

13、ified in 3.9.1.“ II 2 of 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. a- MIL -T-28842A ( EC ) 4.6 through 4.11: Delete paragraph numbers and substitute new paragraph numbers as follows: Delete Substitute “4.6 4.5.6 4.6.1 4.5.6.1 4.6.2 4.5.6.2

14、4.7 4.5.7 4.8 4.5.8 4.8.1 4.5.8.1 4.8.2 4.5.8.2 4.8.3 4.5.9 4.9 4.6 4.9.1 4.6.1 4.9.2 4.6.2 4.9.3 4.6.3 4.9.4 4.6.4 4.9.5 4.6.5 4.10 4.7 4.10.1 4.7.1 4,10.2 4.7.2 4.10.3 4.7.3 4.11 4.8 “ The margins of this amendment are marked with an asterisk or vertical lines to indicate where changes (additions,

15、 modifications, corrections, deletions) from the previous amendment were made. This was done as a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the requirements of this document based on

16、the entire content irrespective of the marginal notations and relationship to the last previous amendment. Preparing Activity: (Project 5805-N253) NAVY - EC *US. QOVERNMENT PRINTING OFFICE 1982 - 60&022/313 3 of 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-