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ACCURATE ELECTRONICS INC

WWW.ACCURATE.ORG

PO BOX 1654 97075-1654 8687 SW HALL BLVD 97008

attenuator switches are set to -7dB,

the gain range of the splitter in

ports is +3 to –17dB. The splitter

attenuator switches, then, should be

set based on the incoming signal

level at the splitter in port and on

the input level(s) required by the

modems connected to the multiple

ports. Select the splitter attenuator

switch setting that places the

midpoint of the 20dB gain range at

each of the splitter out ports nearest

the input level required by the

modems.

This same principle

applies to the combiner attenuator

switch setting (S1-3 and S1-4),

except that this setting is based on

the OUTPUT level of the modems

and the level required at the

combiner out port.

Splitter and

combiner switch settings are listed

in Table 3.

4.07 To adjust the levels at the

splitter output ports, first set S2-3 and S2-4 as described in paragraph 4.06

and then request that 1004hz test tone be sent from the distant end at the level

specified on the CLR. With a 600-ohm terminated voltmeter connected to

the split out 1 jack, adjust the split out level 1 control to the level required by

the modem connected to port 1. Repeat this procedure for the remaining split

out ports.

4.08 To adjust the levels in the combiner channel, first set S1-3 and S1-4 as

described in paragraph 4.06. Then connect a voltmeter, terminated at the

impedance of the comb out port, to the comb out jack. Next, insert 1004Hz

test tone, at the transmit level of the modem, into the comb in 1 jack. Finally

adjust the comb in level 1 control to the level specified on the CLR. Repeat

this procedure for the remaining comb in ports.

5. CIRCUIT DESCRIPTION

5.01 See Figure 1.

5.02 This circuit description is intended to familiarize you with the 104445A

Dual 5-Way Balanced Active Data Bridge for engineering and application

purposes only. Attempts to troubleshoot the 104445A are not recommended

and may void your warranty. Troubleshooting procedures should be limited

to those described in Section 7 of this Practice. Please refer to Figure 1 as an

aid in following the circuit description.

5.03 The combiner channel of the 104445A consists of four (4) transformer-

coupled input ports and four (4) variable-gain operational amplifiers. The

output of each of the four (4) op-amps is combined in a summing amplifier

along with the bus extension input signal. The summing amplifier, which can

be set to one of three (3) switch-selected gain ranges, applies its output to the

power amplifier, impedance option switches, and finally to the balanced

output transformer. Both input and output transformers provide balanced

terminations, and their center taps, simplex leads.

5.04 The splitter channel includes a center-tapped balance transformer,

switch-selectable impedance option, and a distribution amplifier whose gain

range can be switch-set at any of three (3) levels.

distribution amplifier is applied to four (4) variable-gain op-amps, which

drive the splitter out-out ports, and to one fixed-gain buffer amplifier that

drives the bus extension output line. The four (4) variable-gain amplifiers

each apply their signals to the splitter output ports through individual power

amplifiers and center-tapped balance transformers.

5.05 An integral regulated power supply permits operation with an external

input between –22 and –56VDC. Reverse-battery protection is provided by

a blocking diode, while a high-voltage zener diode protects against transients

on the input line.

This document contains proprietary information and is supplied for identification, maintenance, engineering evaluation or inspection purposes only and shall not be duplicated or disclosed without written

permission of: ACCURATE ELECTRONICS INC By accepting this document the recipient agrees to make every effort to prevent unauthorized use of this information.

FIGURE 3. S1, S2 Locations.

the output of the

Practice Section 104445A Rev B

BEAVERTON OR USA 503.641.0118

TABLE 1. External Connections.

PORT 1

PORT 2

PORT 3

PORT 4

BUS EXTENTION INPUT TIP

BUS EXTENTION INPUT RING

BUS EXTENTION OUTPUT TIP

BUS EXTENTION OUTPUT RING

COMMON SPLITTER INPUT TIP

COMMON SPLITTER INPUT RING

COMMON SPLITTER INPUT SX (Simplex)

COMMON COMBINER OUTPUT TIP

COMMON COMBINER OUTPUT RING

COMMON COMBINER SPLITTER OUTPUT SX(Simplex)

-BATT (-22 TO -56 VDC Filtered Input)

6. MECHANICAL OUTLINE

6.01 See Figure 2.

7. TESTING AND TROUBLESHOOTING

7.01 The Testing Guide Checklist (see Table 4.) may be used to assist in the

installation, testing or troubleshooting of the product. The checklist is

intended as an aid in the localization of trouble to a specific product. If a

product is suspected of being defective, a new one should be substituted and

the test conducted again. If the substitute product operates correctly, the

original product should be considered defective and returned to Accurate for

repair or replacement as directed below. We strongly recommend that no

January 2014

FAX 503.646.3903

COMBINER INPUT TIP

COMBINER INPUT RING

COMBINER INPUT SX (Simplex)

SPLITTER OUTPUT TIP

SPLITTER OUTPUT RING

SPLITTER OUTPUT SX (Simplex)

COMBINER INPUT TIP

COMBINER INPUT RING

COMBINER INPUT SX (Simplex)

SPLITTER OUTPUT TIP

SPLITTER OUTPUT RING

SPLITTER OUTPUT SX (Simplex)

COMBINER INPUT TIP

COMBINER INPUT RING

COMBINER INPUT SX (Simplex)

SPLITTER OUTPUT TIP

SPLITTER OUTPUT RING

SPLITTER OUTPUT SX (Simplex)

COMBINER INPUT TIP

COMBINER INPUT RING

COMBINER INPUT SX (Simplex)

SPLITTER OUTPUT TIP

SPLITTER OUTPUT RING

SPLITTER OUTPUT SX (Simplex)

GND (ground)

9 or 11

43 or 45