User manual
20
Control Station Operation, Models 4001, 4001M, 4002, 4002M, 4003, 4003M
To use a Control Station, do the following:
> Press the button or buttons of the channel(s) you wish to interrupt and speak into the microphone.
User Station Operation, Model 4020
To use the model 4020 user station, do the following:
1. Connect the User Station to the Central Electronics via the 3-pin XLR-3 connector on the rear of the User Station.
Polarity and correct connections are important for proper operation.
2. Check the connections to make sure that pin 1 is common and pin 2 has the +28 Volts DC on it with respect to pin 1.
In 3-wire operations, pin 3 will have only DC (positive) and that pin 1 be the common or return (negative).
3. Plug a pair of stereo headphones into the stereo headphone jack on the rear of the Model 4020 User Stations.
4. Adjust headphone levels as desired.
The volume controls are made so that they cannot be turned all the way down, to prevent someone from missing a
cue.
When using a single earplug, do the following:
> Plug its cord into the mono headphone jack.
This jack provides the interrupted audio. Use this jack when plugging a speaker into the Model 4020.
NOTE: User Stations may be paralleled with our TW-4W or similar splitter box. The Central Electronics will power
up to three (3) User Stations per outlet.
Substituting TW Intercom Stations for IFB User Stations
Any RTS TW intercom station may be substituted for a 4020 User Station. The BP-501 User Stations provide stereo IFB. Any
other User Stations should have the channel-select a switch set to channel 1to receive the interrupted monaural audio. A TW
User Station with the LP (Local Power) option can be used to operate on a dry pair IFB feed providing long distance operation
up to 8 kilometers (5 miles) with stepup and stepdown transformers. See Figure 17.
Operating with Telco Dry Pair(s)
The 4020 User Station can be operated on one dry telco pair. Just attach common and the interrupted output to pins 1 and 2
respectively on the XLR connector going to the User Station. For long distances, where hum is a problem, the 4020 can be
operated on two (2) telco pairs in stereo with one (1) of our Balanced/Unbalanced converters at each end.