Section II. FOURTH ECHELON ALIGNMENT

Figure 40. Tuning knob assembly.

trol settings unless specifically directed.

49. General

a. Remove module A8 from the chassis.

a. Scope of Fourth Eohelon Alignment

b. Adjust the RT-505/PRC-25 tuning

Procedures. Fourth echelon alignment

knobs for 30.00 mc and set the BAND

consists of aligning tuning capacitors C1

switch at 30-52.

and C2. These capacitors must be aligned

c. Use a Ballantine Direct Capacity

whenever the front panel is replaced, or

Meter Model 520, or equivalent. Connect

whenever tuning capacitor C1 or C2 is

the ground lead of the 520 to the RT-

replaced.

505/PRC-25 chassis.

b. Equipment Required.

A Ballan-

d. Connect the other lead from the 520

tine Direct Capacity Meter Model 520 or

to the stator section of tuning capacitor

equivalent is required.

C1 at (A8), pin 6 (fig. 31).

e. Set the 520 to the X10 uuf scale,

loosen the clamp on the C1 tuning shaft,

50. Tuning Capacitor C1 Alignment

and adjust the shaft of tuning capacitor

C1 for an indication of 6.8 on the 520.

Align tuning capacitor C1 as outlined in

Note: Check to see that this adjustment has been

made on the proper side of the capacity-per-degree