Ts-900-Xx Tailboard Station; Macb-Xx And Lmacb-Xx Microphone Adapter Cable - Setcom IM-900 Installation And Operation Manual

3.20 TS-900-xx Tailboard Station

3.21 MACB-xx and LMACB-xx Microphone Adapter Cable

The weatherproof TS-900-xx Tailboard Station provides a weather
tight intercom access/radio listen position. Length is 75 or 100 feet.
The TS-900-xx is normally used in conjunction with a 25-0689 15ft
Extension Cable and a jumpseat headset with a PO/PO (Push-
ON/Push-OFF) microphone. The PO/PO switch makes it easier for a
crew member to assist the driver when backing up. Normally used for
a tiller station that requires radio listen and intercom access, or the
tailboard that requires intercom only. The TS-900-xx is plugged into
the JS-902-xx Jump Seat Station with Expansion Port becoming the
last station in the "REMOTES" daisy-chain. Shielded cable is provided
with the TS-900-xx and is terminated with a twist-lock connector. The
TS-900-xx may also substitute for a PS-900-xx if the box and cable
orientation better suit the installation requirements.
The MACB-xx and LMACB-xx Microphone Adapter Cables allow
plug-in installation, retention of the hand mic, and easy exchange of
the radio for maintenance. Use of a Setcom MACB will not void a
new radio warranty and eliminates problems that can occur if a
radio cable is mis-wired. Some radios offer accessory ports that
provide these same features through using a terminated radio
cable. The Setcom radio interface identifier is denoted here with xx.
For example, the LMACB-MU, shown left, is for interfacing through
the hand microphone port on a Motorola Spectra; the "MU"
identifies the Spectra handmic port in this example. A standard
MACB-xx has a 20-inch radio cable, and a 6-foot cable to the IM-
900. The LMACB has an 18-foot cable to the IM-900. Some radios
allow all function to be accessed through the hand mic port, for
others the speaker audio is connected with flying leads that parallel
the external speaker leads.
NOTE: A few radios have handmics that are "HOT". This means
the microphone is active and connected to the radio whenever the
radio is keyed. This can cause both the keying headset boom
microphone and the handmic to be active when the radio is keyed
from the intercom system. This will cause double loading of the
transmit circuits which will cause a decrease in transmit audio and
objectionable background noise from the handmic. On many newer
radios this problem can be eliminated through a menu item of the
radio's software. Alternately, a handmic can easily be replaced or
converted to a version with contacts for both the microphone and
the PTT circuit or the handmic can be removed and stowed in the
glove box for backup purposes
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