Level Functions - Promax MO-170 Manual De Instrucciones

To quit this function, the MENU key must be pressed.
Channel: Using the set of channel tables included in the MO-170 makes the
output frequency tuning faster. This allows direct selection of standard frequencies
used in most countries.
Entering this function, a list of all available channels is displayed sequentially.
Turning the encoder will lead us to the desired one. Pushing the encoder selection key
will exit that function.
The channel list is taken from a set of channel plans loaded into the equipment.
The available channel plans are displayed and selected from the CONFIGURATION
menu, as we'll see later.
Also in this case, frequency changes are applied immediately to the RF stage,
allowing an interactive frequency adjustment.
The list of channel plans can be found in Appendix A.
Disable: This option is to disable the RF output. This is performed by introducing a
strong attenuation (around 80 dB) to the RF signal. At the same time, the IF
frequency is tuned to a nominal value of 36 MHz. The selectable values are:
• NO
• YES

4.6 LEVEL functions

This menu item collects the functions related to RF level adjustment. The MO-170
has a built-in programmable attenuator of 60 dB, in 1 dB steps. At the same time, the
nominal RF level can be finely adjusted using a voltage controlled attenuator. This
allows to set a reference level using the voltage controlled attenuator, to then apply the
mentioned 1 dB attenuation steps to that reference value.
That RF gain structure can be controlled using the following functions.
Attenuation: this function allows to select the RF output level by applying 1 dB
attenuation steps, from 0 dB to 60 dB. Turning the encoder CW increases the
attenuation, reducing the output level. Turning CCW enables the opposite
behaviour.
Level changes are applied immediately to the RF output, to allow smooth and
easy adjustment of RF output conditions. Pressing the encoder or MENU key exits this
function.
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USER'S MANUAL. MO-170
12/2006