1.3.2      TS-202 DTMF Generator

The TS-202 generates a DTMF tone to test a commercial inserter or to encode tones onto a videotape.  Prior to sending an individual tone or a tone sequence, you can set the desired audio output level.  There are two modes of tone generation.

- In the SINGLE mode, a one second tone is generated each time a key is depressed.
- In the MULTIPLE mode, you can enter the desired tone sequence and the press the SEND key.  The sequence is then generated in the 50 msec on/off duration used by the cable television networks when they send network cues tones.

The TS-202 will store up to nine tone sequences of up to eight digits in memory for later retrieval.  The last tone or sequence and audio level generated is retained until a new command is entered.  A GPI Interface automatically transmits the tone sequence stored in memory position one.

An internal 600 ohm termination can be switched into the TS-202 output if needed.

An earphone jack is provided to allow the operator to monitor the output tones.

3.3         Operation

3.3.2 TS-202 DTMF Generator

The TS-202 has two modes of operation. The output level can be set prior to generating DTMF tones in either mode.

A. In the SINGLE mode, the TS-202 outputs tones for one second as each character key is pressed.

B. In the MULTIPLE mode, the TS-202 stores up to eight characters and shows them on the display. When the SEND key is pressed, the tones are sent in 50 msec on/off intervals.
The MODE is selected from the keypad. The ALT key lets you use the upper functions labeled on the keys. When ALT is selected, there is an indication on the far right of the display. The ALT key will automatically reset when the next key is pressed.

3.3.2.1 How to Change the Mode

1. Press the ALT key.
2. Press the MENU key.
3. Use the up and down arrows on the keypad to select MODE and press the SEND key to enter..
4. Use the up and down arrows to select the SINGLE or MULTIPLE mode.
5. Press the SAVE key to enter.

3.3.2.2 How to Send Tones in the SINGLE Mode

1. Set the mode of operation to SINGLE as described in paragraph 3.3.2.1.
2. Press the keys for the tones you wish to send. Each tone will be generated for one second.
3. To generate the A, B, C, or D tones, first press the ALT key, then the tone key.

3.3.2.3 How to Send Tones in the MULTIPLE Mode

1. Set the mode of operation as described in paragraph 3.3.2.1.
2. Press the keys for the tones you wish to send. The display will show the tones you have selected. There is a limit of eight tones.
3. Press the SEND key to output the tones.

Figure 3-4
TS-202 DTMF Generator

ARROW KEYS - Used to scroll up and down in the menu.
SEND - Outputs tones in the MULTIPLE mode.
ALT - Used to select upper case keyboard commands (SAVE and PRINT).
MENU - Used to access the menu functions of the test set.
SAVE - Used to store DTMF tone and level sequences in internal memory.

Figure 3-5
TS-202 Connector Layout

GPI/EAR - GPI Interface jack.
AUDIO - Audio input terminal. Pins 1 and 2 are the audio input connections. Pin G is ground.
POWER - AC adaptor input jack. Use only the AC adaptor supplied with the test set.
ON/OFF - Power switch.
RS-232 SERIAL - Data input jack. Used by the factory for program updates only.

3.3.2.4 How to Set the Output Level

1. Press the ALT key.
2. Press the MENU key.
3. Use the up and down arrows to select LEVEL.
4. Press the SEND key.
5. Use the up and down arrows to select the desired output level.
6. Press the ALT and SAVE keys to enter.

3.3.2.5 How to Store Tones

The TS-202 has the ability to store up to ten tone sequences for later recall. When in the MULTIPLE mode, you can use the up and down arrows to select any of the stored tone sequences. To store a tone sequence:

1. Enter the tone sequence you wish to save (up to eight digits).
2. Press the ALT key.
3. Press the SAVE key.
4. You will be prompted to choose the memory location (1-9) where you want to store the sequence.

3.3.2.6 How to Select the Internal 600 ohm Termination

The TS-202 has an internally selectable 600 ohm termination. You can select or remove the termination from the MENU key. When the termination is removed, the TS-202 has a high impedance, balanced input.

1. Press the ALT key.
2. Press the MENU key.
3. Use the up and down arrows to select TERMINATOR and press the SEND key.
4. Use the up and down arrow keys to select ON or OFF.
5. Press the SAVE key to store.

3.3.2.7 How to Select the Volt or dB Output Level Range.

1. Press the ALT key.
2. Press the MENU key.
3. Use the up and down arrow keys to select DISPLAY and press the SEND key.
4. Use the up and down arrow keys to select VOLT or DB.
5. Press the SAVE key to store.

3.3.2.8 GPI Interface

Applying a short to the GPI (EAR) jack will cause the tone sequence stored in memory position one to be transmitted.

3.3.2.9 MENU Options

The MENU options of the TS-202 are:

MODE - selects the SINGLE or MULTIPLE mode of operation.
LEVEL ADJUST - sets the audio output level.
TERMINATION - selects or removes the internal 600 ohm termination.
Volt or DB UNITS of measurement - selects either peak volts or DB output level.

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