4 
other to the Dual Channel plate as deseribed above, Disconnect cables 5 
and 7 from the back of the Time Tone amplifier chassis in Rack 1 and 
plug both cables into the two receptacles of the Dual Channel plate, 
56,.. This change in the normal cable connections provides two independent 
- receiving channels, one making use of the normal duty channel with its 
recording equipment located in Rack 2, and the other, feeding directly 
into the recording equipment in Rack 3. Time indexing and PL graphic 
level recorder motor control from the automatic switching unit are obtained 
in the normal way for both channels, 
57. The normal “duty™ channel can be monitored from the jack on the right 
side of the third panel from the top of Rack 1 just as in conventional 
single channel operation. If crystal headphones are used to avoid loading 
the 600-chm bus, it can also be monitored from the jack marked BUS MONITOR 
on the "slowe-speed" PL recorder in Reck 2. Ths other channel can only 
be monitored on crystal headphones plugged into the BUS | MONITOR jack on 
the thigh-speed™ PL recorder in Rack 3. 
58. To obtain a comparable output level from both channels turn the BUS 
VOLUM dial on the right side of the second panel from the top of Rack 1 
to 0. Then control geen aes Spr nals by adjusting the CHANNEL 
NO. & VOLUME and the CHANNEL JCLUME controls on the left side of 
the top and second Bane of Rack ne 
