Dual lis ten func tion al ity – Clear-Com WTR-680 User Manual
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Dual Lis ten Func tion al ity
The base sta tion’s main au dio board has the op tion of plac ing
ad di tional parts to en able dual lis ten. Dual lis ten al lows the
mix ing of the in ter com chan nels. The mix ing will oc cur lo -
cally, within the base sta tion, and is only heard on that base
sta tion's beltpacks. The user will have the abil ity to en able/dis -
able the mix of I/C A into I/C B or vise versa.
They will also have the abil ity to con trol the level of the mix
(-4 dB to -24 dB down from main chan nel). Re moving two
sur face mount re sis tors and in stall ing two SPDT switches and
two po ten ti om e ter en ables dual lis ten. The parts to be in stalled
are shown in Ta ble 1. The two re sis tors on the board to be re -
moved are in Ta ble 2.
Ta ble 1
Parts to be In stalled by User to En able Dual Lis ten
Ta ble 2
Parts to be Re moved by User to En able Dual Lis ten
The listed man u fac tures and part num bers in Ta ble 1 are those
that the au dio board was laid out for and thus the hole pat tern
used. Sev eral of these parts may be found at Digi-Key and
other dis trib u tors. Trim the leads on the parts so they can not
hit the metal case. Lo ca tions to place these com po nents are
pro vided on au dio board part num ber 750608.
The au dio board part num ber is lo cated on the lower left hand
side of the board if fac ing the front of the unit. The lo ca tions
where the com po nents can be in stalled are on the up per right
hand side of the board. See Fig ure 21 for the lo ca tions.
Fig ure 21
Au dio Board Part Num ber and Dual Lis ten Com po nent Lo ca tions
5-7
Board
Des ig na tor
De scrip tion and Func tion
Value
Man u fac turers, Part No.
VR5, VR6
Po ten ti om e ters
20kW - 25kW
Bourns, 3309P-1-203
VR5 = Con trols I/C A into I/C B Mix
CTS, U262R253B
VR6 = Con trols I/C B into I/C A Mix
Piher, PT10LV10-203A2020
S6, S7
Switches
SPDT
E-Switch, 500ASSP1M2RE
S6 = En able/Dis able I/C A into I/C B Mix
E-Switch, EG1218
S7 = En able/Dis able I/C B into I/C A Mix
Alcoswitch, TSS11DGPC
Board
Des ig na tor
De scrip tion and Func tion
Value
R295
Re sis tor, De fault if mix com po nents not in stalled
10k
R296
Re sis tor, De fault if mix com po nents not in stalled
10k
FRONT
BACK
B INTO A
MIX
OFF
ON
ON
IF PARTS INSTALLED
REMOVE R296
S7
S6
R
2
9
6
R
2
9
8
V
R
6
MIX
LEVEL
OFF
ON
ON
IF PARTS INSTALLED
REMOVE R295
R
2
9
5
R
2
9
7
V
R
5
MIX
LEVEL
A INTO B
MIX
B INTO A
MIX
OFF
ON
ON
IF PARTS INSTALLED
REMOVE R296
S7
S6
R
2
9
6
R
2
9
8
V
R
6
MIX
LEVEL
OFF
ON
ON
IF PARTS INSTALLED
REMOVE R295
R
2
9
5
R
2
9
7
V
R
5
MIX
LEVEL
A INTO B
MIX
750608 REV X
879416- 1 REV J
750608 REV X
879416- 1 REV J