User Manual

Technalogix Ltd. TM-100 Modulator

C. AUDIO input connection and adjustment – BASEBAND AUDIO

1. If your Technalogix TM-100 agile modulator is equipped with a 4.5MHz

sub-carrier input option, ensure that the rear-panel AUDIO SELECT switch

is in the BASEBAND position.

2. Connect a 1V

P-P

baseband audio signal to the rear panel baseband audio

connector as follows:

• For balanced input connection, connect one audio input lead to

the left terminal on the connector and the other audio input lead

to the right terminal.

• For unbalanced input connection, connect one audio input lead

to the left terminal on the connector and the other audio input

lead to the center terminal.

• Center terminal is chassis ground.

• Insert the terminal into the connector on the rear panel of the

TM-100.

3. Adjust the front panel AUDIO MODULATION control for 100% modulation.

• Set the front panel DISPLAY SELECT switch to AUDIO (up)

position.

• Observe front panel LED bargraph behind front panel display

readout window.

• First RED LED will begin illumination at approximately 95%

modulation; or

• Adjust for ±25KHz deviation using a spectrum analyzer; or

• Listen to the audio output from TV monitor and setting the

loudness equal to that of an off-air channel carried on your

system.

D. AUDIO input connection and adjustment – 4.5MHz Subcarrier input

1. Set the rear panel AUDIO SELECT switch in the 4.5 position.

2. Connect a modulated 4.5MHz subcarrier signal to the rear panel 4.5MHz

input F-connector jack.

3. Inject a minimum +36dBmV (-12.75dBm) 4.5MHz RF carrier into the unit.

4. Using the setup in Step A.5., measure the audio RF carrier output level at

the rear panel RF OUTPUT jack. Level should be within ±2dB of the

measurement taken in Step A.5.