APPENDIX C

TB-9-4931-523-35 Attenuators Fixed and Variable (10 MHZ TO 40 GHZ) (General) Manual
Page Navigation
38

TB 9-4931-523-35

APPENDIX C

NOTE

Software package USATA PDMAT () can be used in place of

steps 1a(1) through 1a(35) below, verifying that the TI meets

or exceeds accuracies listed in appendix A. Copies of the

software package are available from Commander, U. S. Army

Aviation and Missile Command, ATTN: AMSAM-TMD-LW,

Redstone Arsenal, AL 35898-5000.

1. Alternate Variable Attenuation Measurement (10 MHz to 18 GHz).

a. Performance Check

NOTE

When performing the following steps, if TI frequency range

extends above and below 1.3 GHz, it will be necessary to

perform two separate tests - one below and one above 1.3 GHz.

(1) Zero and calibrate power meter and measuring receiver RF power, then connect

equipment as shown in figure 4.

(2) Record the 10 test frequencies selected in paragraph 7a in to the test frequencies

column of table C1.

(3) Adjust signal generator No. 1 frequency controls to test frequency recorded in

table C1 and adjust signal generator No. 1 RF output controls for +6 dBm.

NOTE

Use adapters as needed.

NOTE

Use waveguide to coaxial adapters when TI is waveguide.

NOTE

Use 50Ω-to-75Ω or 50Ω-to-93Ω adapters when TI is 75Ω or

93Ω.

(4) If the AUTO TUNING indicator light is off, press the measuring receiver FREQ

and BLUE (SHIFT) AUTO TUNING keys on the measuring receiver.

NOTE

For frequencies below 1.3 GHz proceed to step (8) below.