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Dual Lis ten Func tion al ity
The base sta tions'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. If you have
TR-825 beltpacks, there is no need to in stall this base op tion.
The level of the mix can be controlled at the TR-825 via the
two vol ume con trols.
Board
Des ig na tor
VR5, VR6
Po ten ti om e ters
VR5 = Con trols I/C A into I/C B Mix
VR6 = Con trols I/C B into I/C A Mix
S6, S7
Switches
S6 = En able/Dis able I/C A into I/C B Mix
S7 = En able/Dis able I/C B into I/C A Mix
Des ig na tor
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 and
ASY000108000.
BACK
FRONT
De scrip tion and Func tion
Parts to be In stalled by User to En able Dual Lis ten
Board
De scrip tion and Func tion
R295
Re sis tor, De fault if mix com po nents not in stalled
R296
Re sis tor, De fault if mix com po nents not in stalled
Parts to be Re moved by User to En able Dual Lis ten
750608 REV X
879416- 1 REV J
Au dio Board Part Num ber and Dual Lis ten Com po nent Lo ca tions
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.
Value
20k
- 25k
SPDT
Ta ble 1
Ta ble 2
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 22 for the lo ca tions. Board
part num ber 750541 does not have lo ca tions to place com po - -
nents, how ever, mod i fi ca tion doc u ments may be ob tained
from Telex Com mu ni ca tions for those who wish to mod ify
older au dio boards for dual lis ten.
MIX
LEVEL
B INTO A
MIX
MIX
LEVEL
ON
ON
OFF
S7
IF PARTS INSTALLED
REMOVE R296
S6
MIX
LEVEL
MIX
ON
ON
OFF
LEVEL
A INTO B
MIX
IF PARTS INSTALLED
REMOVE R295
750608 REV X
879416- 1 REV J
Fig ure 22
5-8
Man u fac turers, Part No.
Bourns, 3309P-1-203
CTS, U262R253B
Piher, PT10LV10-203A2020
E-Switch, 500ASSP1M2RE
E-Switch, EG1218
Alcoswitch, TSS11DGPC
Value
10k
10k
B INTO A
MIX
ON
ON
OFF
S7
IF PARTS INSTALLED
REMOVE R296
S6
ON
ON
OFF
A INTO B
MIX
IF PARTS INSTALLED
REMOVE R295
ASY000108000 REV X
OR
ASY000109 - X REV X
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