User's Manual

TM-200 Issue 1.02 November 2005 Page 20 of 64
Setup of Output Level and Channel Selection
1. Connect a spectrum analyzer, or a field strength meter tuned to the frequency of
the video RF carrier of the desired channel, to the RF OUTPUT jack on the rear
panel of the unit. Alternatively, connect a spectrum analyzer or a field strength
meter to the –20dB TEST POINT on the front panel of the unit.
2. Select the desired output channel using the CHANNEL SELECT paddle switch
on the front panel.
• Hold the CHANNEL SELECT switch in the up- or down-position for
approximately 3 seconds to activate the channel-select circuit;
• Toggle the CHANNEL SELECT switch up to select a higher channel
or toggle it down to select a lower channel. The switch may be held in
the up- or down-position for rapid channel switching.
3. Observe the output on the spectrum analyzer, or the field strength meter. If
measuring from the rear panel RF OUTPUT jack, adjust the front panel OUTPUT
LEVEL potentiometer for an output level between +55dBmV and +60dBmV. If
measuring from the front panel –20dB TEST POINT, ensure that the rear panel
RF OUTPUT jack is terminated into a 50Ω load, then adjust the front panel
OUTPUT LEVEL potentiometer for an output level between +35dBmV and
+40dBmV.
4. If using a field strength meter, retune the meter to the frequency of the audio RF
Carrier.
5. Still observing the output on the spectrum analyzer, or the field strength meter
(now tuned to the frequency of the audio RF carrier), adjust the front panel
AURAL CARRIER potentiometer for an output level 10-13dB lower than that at
which the video RF Carrier is set.
6. Remove the spectrum analyzer, or field strength meter from the unit. If available,
connect a television/monitor to the front panel –20dB TEST POINT, apply power
to the television/monitor and tune to the selected output channel of the
Technalogix TM-200 modulator.