TB 9-5985-314-24
ALTERNATE CALIBRATION PROCESS
FOR VSWR BRIDGES (10MHZ TO 18GHZ)
NOTE
Software package USATA PD-MAT () can be used in place of
steps 1 a (1) through 1 a (36) below, verifying that the TI meets
or exceeds accuracies listed in Appendix B. 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 Calibration Process for VSWR Bridges (10 MHz to 18 GHz)
a. Performance Check
NOTE
When performing the following steps, if TI frequency range
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. Connect TI
as shown in figure 7, Appendix E.
(2) Determine and record in Table F-1 a minimum of 10 evenly spaced test
frequencies over the entire TI frequency range. Connect N-Short to TI DEVICE UNDER
TEST port.
(3) Adjust signal generator No. 1 frequency controls to test frequency recorded in
table F1 and adjust signal generator No. 1 RF OUTPUT controls for +6 dBm.
NOTE
Use adapters as needed.
(4) Press 4.0 SPCL keys and, if the AUTO TUNING indicator light is off, press the
measuring receiver FREQ and BLUE (SHIFT) AUTO TUNING keys.
NOTE
For frequencies below 1.3 GHz proceed to step (8).
NOTE
For frequencies 1.3 GHz and above, proceed to step (5) below.
For frequencies above 1.3 GHZ, the offset frequency should be
120.53 MHz above that of signal generator No. 1.
(5) Enter the test frequency into the measuring receiver and press the MHz key.
