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120 Handbook of Intercom Systems Engineering
4025A Splitter
The 4025A combining device parallels up to four, 25 pair cables to yield one cable to
connect to the 4010 IFB Central Electronics Unit.
4030 Talent User Station
The 4030 talent user station is a distributed amplifier with interrupt and non-interrupt
volume controls. Studio talent personnel use a Model 2234 earset (previously described),
which plugs into the 4030. Sports commentators wearing headphones or headsets use the
stereo jack on the 4030. This allows IFB in one ear and a separate program feed to the
other ear.
MCE325-K Programmable User Station
In our medium sized intercom, we have specified six MCE325-K units. Although
described earlier in the small mobile unit example, these powerful stations are configured
differently here. As you recall, we programmed the MCE325-K for two PL and two IFB
circuits for the director. In this case, however, the panel assumes the role of a two-channel
conference station, which contains a host of features such as individual talk/listen buttons
and levels, footswitch control, and call light.
BP319 Belt Pack
The BP319 Belt Pack is a single channel, distributed amplifier (assignable to any of 12
conference circuits via the SAP1626). It provides simple operation with its electronic talk
switch and volume control.
BP325 Programmable Belt Pack
Used by the Roof Access position in our scenario, this unit was chosen for its binaural
headset capability and high SPL, needed for a high noise area such a helipad.
Telos Link
This interface is a vendor unit that provides a no-fuss link to the telephone for studio-
mobile production coordination.
Headsets and Earsets (not shown)
The PH-88R Lightweight Headset was chosen for the BP319 positions, the aircraft noise
rated PH10-R5 was selected for the roof access position, and the Model 2234 talent earset
was chosen for the news anchors because of its invisibility on camera.
Four-wire Case (Medium Intercom)
Referring to the position table (see Table 8.1), we now specify an equivalent four-wire
system for our sample medium intercom. Using the four-wire matrix, we gain two more
forms of communication, namely ISO and Point-to-Point:
Referencing figure 3, first we notice the four-wire alternative for our medium system is
simpler and uses less cable. Using a laptop or desktop computer (not shown), we configure
our system as we did our application demands. In essence, we are the painters on a blank
canvas. Attached the back end of our matrix system is a static conference line system
linked to the Zeus
™
matrix via four interface lines. The SAP612 provides a two-wire
channel assignment to any of these four lines.