DISPATCH INTERFACE MODULE (DIM)

Table 11-3 BACKPLANE PLACEMENT

Backplane

Description

Wire Harness

P34 to P45

J1,3,5,7

 

 

 

 

 

pin 27

Sec Rx +

pin 1

RxS+

pin 28

Sec Rx -

pin 2

RxS-

pin 29

EA lead

pin 3

EA

pin 30

EB lead

pin 4

EB

pin 31

Pri Rx Audio+

pin 5

RxA+

pin 32

Pri Rx Audio-

pin 6

RxA-

 

 

J2,4,6,8

 

 

 

 

pin 59

Sec Tx +

TxS+

pin 1

pin 60

Sec Tx -

TxS-

pin 2

pin 61

MA lead

MA

pin 3

pin 62

MB lead

MB

pin 4

pin 63

Pri Tx Audio+

TxA+

pin 5

pin 64

Pri Tx Audio-

TxA-

pin 6

11.2.3 E-LEAD SELECTION

If the PTT from the console is an open contact relay, either of the above options for J36 may be used.

If the PTT is a closure to ground with a pull-up resistor to a positive voltage, J36, pin 2 should be connected to ground without connection to pin 1 or pin 3.

11.2.4DIM BACKPLANE EXTERNAL CONTACTS

See Backplane Section 23 for pinouts on the shelf backplane and wire harness pinouts.

11.3 DIM ALIGNMENT SPECIFICATION

11.3.1 PRE-ALIGNMENT

The DIM is pre-aligned with the Basic Board Module alignment procedures (Refer to Section 7.3). The tone remote personality card should be removed and P33 jumpered accordingly for the proper pre- alignment of the module (Refer to Table 11-2).

11.3.2PRE-ALIGNMENT WITH TONE REMOTE PERSONALITY CARD

Set the module for pre-alignment by referring to Table 11-1, Alignment Points Diagram Figure 7-2,and Figure 11-1.

1.Set the card Tone Remote PTT level alignment:

a.Inject 2175 Hz ±1 Hz at 0 dBm into EQU of Rx input J1.

b.Open S1 (Sections 1, 2, 3 and 4).

c.Set S5 for Test 1 (Open section 1, close section 2, 3 and 4).

d.Reset the module, press S2 and release.

5.Main Rx audio level from J1:

a.Setup for alignment as in Step 1.

b.Adjust R41 to -6 dBm ±0.5 dB at J11.

3.Tone Remote Personality Card:

a. Adjust R207 for a minimum at EP221. (Should be < -15 dBm.)

b. Adjust R228 for 0 dBm ±0.5 dB at EP224.

c. Adjust R236 for a peak level at EP225.

d. Adjust R272 for a peak level at EP227.

e. Verify EP228/EP229 are high (> 4.5V).

f.Reduce the level of the 2175 Hz tone until EP228 goes low (< 0.8V). Verify the level of the 2175 Hz tone is -10 dBm ±2 dB.

g.Verify that EP229 is still high ( > 4.5V).

h.Reduce the level of the 2175 Hz tone until EP229 goes low (< 0.8V). Verify the level of the 2175 Hz tone is -40 dBm ±2 dB.

i.Change the frequency and level of the input tone to 1004 Hz at -12 dBm.

j.Verify that the level at J11 is -6 dBm ±1 dB.

k.Verify that the level at EP221 is -6 dBm ±1 dB.

l.Verify that the level at TP5 is -6 dBm ±1 dB. m.Adjust R211 for -12 dBm ±1 dB at EP222.

11-2