TB 9-4931-534-24
RF output level to +5 dBm.
(4) Establish a reference on receiver system at test frequency.
(5) Disconnect short from equipment setup.
Record receiver system readout
indication (to include the sign).
(6) Connect TI to VSWR bridge and record receiver system indication.
NOTE
Sliding terminations and mismatches only: Adjust sliding load
to phase the standard with the TI by establishing a minimum
and maximum return loss indication.
Average the two
indications and record results as TI return loss.
(7) Perform step (8) below if value recorded in step (5) above is - (negative), or
step (10) below if value recorded in step (5) above is + (positive).
(8) Divide value recorded in step (5) above by 2.
Invert sign and add to value
recorded in step (6) above. Record the sum as return loss.
EXAMPLE A: If a value of (5) above is -1.425
(a)Divide -1.425 by 2
-1.425 2 = -0.712
(b)Invert sign of -0.712 = +0.712
(c) Add +0.712 to value recorded in step (6) above. (Let example value recorded
in step (6) above be 10.741.)
10.741 (step (6) above example)
+0.712
11.453 return loss
(9) Proceed to step (11) below.
(10) Divide value record value recorded in step (5) above by 2. Invert sign and
subtract from value recorded in step (6) above. Record difference as return loss:
EXAMPLE B: If value of step (5) above is +1.425
(a)Divide +1.425 by 2
+1.425 2 = +0.712
(b)Invert sign of +0.712 = -0.712
(c) Subtract -0.712 from value recorded in (6) above.
(Let example value
recorded in step (6) above be 10.741.)
10.741 (step (6) above example)
-0.712
10.029 return loss
(11) Remove TI from VSWR bridge and connect short to VSWR bridge.
5