Insertion Loss and Isolation (Coaxial Isolators)

TB 9-4931-534-24

(12) Adjust synthesized signal generator RF output level to reference established on

receiver system in step (4) above.

(13) Repeat technique of steps (5) through (11) above 2 times and average values.

Averaged value in dB will be within the limits listed in appendix A.

(14) Adjust synthesized signal generator frequency to the next frequency test point

listed in 7 a above and RF output level to reference established on receiver system in

step (4) above.

(15) Repeat steps (5) through (13) above for remaining frequencies recorded in

b. Adjustments. No adjustments can be made; however, a correction chart may be

prepared showing actual VSWR values at test frequencies.

Insertion Loss and Isolation (Coaxial Isolators)

a. Performance Check

(1) Connect equipment as shown in figure 1 or figure 2, except do not connect VSWR

bridge into equipment setup. Allow equipment to warm-up 1 hour.

(2) Adjust synthesized signal generator frequency to test frequency recorded in

paragraph 7 a above with optimum RF output.

(3) Establish a reference on the receiver system at test frequency recorded in

(4) Connect TI between power splitter and power module (fig. 1 or fig. 2). TI arrow

must be pointed in direction of signal flow from synthesized signal generator to

receiver system.

(5) Insertion loss in dB indications displayed on receiver system will be within

limits listed in appendix A.

(6) Reverse TI connections. TI arrow must be pointed against the signal flow from

synthesized signal generator to receiver system.

(7) Isolation in dB (minimum) indication displayed on receiver system will be within

limits listed in appendix A.

(8) Repeat steps (2) through (7) above for remaining test frequencies recorded in

b. Adjustments. No adjustments can be made.

10. Final Procedure

a. Deenergize and disconnect all equipment.

b. Annotate and affix DA label/form in accordance with TB 750-25.