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How to Test Communications on a Motorola R2400A

The Motorola R2400A is a tool used by communication technicians to service and maintain two-way radio equipment. Technicians use this monitor to troubleshoot communication problems. The R2400S provides both an analog and a digital readout to help identify issues. The unit also features an oscilloscope that displays waveforms the technician can use for analysis. You can begin testing communications with the Motorola R2400S if you work methodically through the controls.

Instructions

- 1
  Turn the power on. The toggle switch offers three positions. In addition to the ̶0;off̶1; position, you can put the unit on standby by selecting ̶0;STBY.̶1; This mode allows the battery to keep charging while the circuits are turned off. The full ̶0;on̶1; position allows for the complete operation of the unit.
- 2
  Choose a position for the mode switch. This is a toggle switch that allows you to choose three different signals to monitor or generate. ̶0;FM̶1; will allow you to deal with frequency modulated signals. The ̶0;CW̶1; position is for un-modulated radio frequency signals and ̶0;AM̶1; enables you to generate or monitor amplitude modulated signals.
- 3
  Position the function switch. You can choose to generate radio frequency signals or monitor radio frequency signals. Select ̶0;HI GEN̶1; to generate and monitor signals in higher frequencies. You can choose the ̶0;SENS MON̶1; to monitor low-level signals. The ̶0;PWR MON̶1; position allows the Motorola R2400A to measure output from transmitters.
- 4
  Select the programming sequence. By depressing ̶0;Freq,̶1; you can select the frequencies you want to monitor or generate. Selecting the ̶0;Tone Data̶1; button will allow you to program the level of any tone you want to generate or monitor. Pressing ̶0;Dev Lim̶1; allows you to program the deviation limit for any signal so that you can focus on the frequencies you need to check.
- 5
  Connect a cable to the ̶0;RF In/Out̶1; jack on the ̶0;RF̶1; section. Adjust the ̶0;Step Attenuator̶1; to control the volume level of any signal entering or leaving the Motorola R2400A. Each step on the attenuator raises or lowers the signal by 10 decibels. Move the ̶0;RF Vernier̶1; knob to limit the maximum output from the unit -- this will act set a limit on how much volume can come from the step attenuator.
- 6
  Position the switches in the oscilloscope section. The ̶0;Vert̶1; switch allows you to select the values you want to see in the vertical display. The ̶0;HORIZ̶1;switch controls the horizontal sweep rate for the oscillator. The ̶0;MOD̶1; switch lets you select the type of signal you wish to monitor.
- 7
  Set the controls in the Monitor section. The ̶0;Image̶1; switch lets you select the frequency ranges of high or low for any signal you want to generate. The ̶0;BW̶1;switch is where you set the band width. You can also move the volume control knob to select the signal strength of the tone you wish to generate. You can also control the input or output of a microphone.
- 8
  Select the mode in the code synthesizer section. Choose the private line frequency for both incoming and outgoing signals.

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