MX Series - 1 Watt UHF AMPLIFIER
TSM 20-312 rev 0: June 14, 2000
11
1
W UHF Amplifier
GENERAL DESCRIPTION
FIRST-TIME, ON-SITE TRANSMITTER START-UP PROCEDURE:
Please take the time to read and understand the technical Sections of this manual, which contain
information that you might want or need when you first start your newly installed transmitter.
The amplifier meter was calibrated at the factory to read 100% at 1W sync peak and at the channel
specified by the customer. The point is that if the amplifier is to operate at a channel other than that of the
factory test channel, the metering requires re-calibration. In other words, a meter indication of 100% on
channel 47 at 1Wsp may only read, say, 80% on the meter on channel 40 for the same 1Wsp output. In
other words, the power meter setting is a channel dependent calibration.
1.
Connect the transmitter output to a 50 ohm dummy load or the antenna. The transmitter uses a 50
Ω
type BNC connector for its output. An inline wattmeter or spectrum analyzer can be used for
power measurements. 1W sync peak is equal to +30dBm.
2.
Transmitters only: Apply 117VAC to the exciter. Connect a 1 V peak-to-peak video signal to the
exciter video input jack. Connect an audio signal to the exciter audio input. Connect the RF output
of the exciter to the RF input of the amplifier. Be sure to adjust the RF output level control at
minimum for the time being.
Translator only: Apply 117VAC to the channel processor. Apply the input channel signal to the
input of the channel processor, and its RF output to the input of the amplifier. Ensure that the RF
level control is at minimum for the time being.
3.
Connect the 117VAC mains input to the amplifier. This AC circuit should be supplied through a
slow-tripping breaker or time delay fuse with at least 2A rating.
4.
Push the switch to the `ON’ position. The power supply should be ON indicated by the lit green
LED above the switch.
5.
Adjust the RF level control on the exciter/channel processor until the front panel power meter
reads 100%. The meter was calibrated at the factory at a specific channel which means that if the
current operating channel is other than that of the factory test channel the meter reading will be
incorrect.
WARNING :
If the amplifier is to operate on a channel other than the channel set at the factory,
the front panel power meter must be re-calibrated.
