User's Manual

TM-200 Issue 1.02 November 2005 Page 18 of 64
Aural Carrier Level - Allows user to set aural carrier level relative to visual carrier level.
Modulator is factory tested at –10 dBc (decibels below visual carrier).
Output Select – Selects the desired channel of operation. If you require a lower channel
than the one currently displayed, push the toggle switch down. The channels will
change one at a time as many times as you press the switch. Holding the select switch
in the up or down position will “scan” to the desired channel. It is normal for the
frequency lock LED to turn off during and for a few seconds after, changing channels.
The switch must be held up or down initially for three seconds. This helps to ensure that
no accidental channel changes will occur.
Output Level – Sets visual carrier output level.
RF Out Test Point – Provides a sample of the RF output level which is 20 dB below the
actual value. RF test point is only a relative indicator of the actual RF output level and
may vary. All RF operating measurements should be made at the RF output of the unit.
RF Output - Modulated Audio/ Video output capable of +60 dBmV levels using built in
low distortion hybrid amplifiers.
RS-232 Ports – Set up for optional RS-232 control option.
Combined IF Input/ Output – 45.75 MHz visual carrier and 41.25 MHz audio carrier
intermediate frequency signal loop.
Audio Input/ Ouput Loop – Available for baseband audio processing.
Video Input/ Output Loop - Available for baseband video processing.
IF Pre-Correction Loop – Allows pre-correction adjustment to improve linearity,
intermodulation performance, and other RF parameters. Internally connected to Signal
Conditioning PCB.
Video In – Connection for 1.0 Volt peak to peak video source.
Balanced Baseband Audio In – Used to connect a 1 Volt peak to peak baseband audio
signal. For balanced input connection, connect 1 audio input lead to the left terminal on
the connector and the other audio input lead to the right terminal. For an unbalanced
input connection, connect one audio input lead to the left terminal on the connector and
the other audio input lead to the centre terminal. The center terminal is chassis ground.