User manual

FM100B • 9
• Turning on the microphone:
[1] Make sure a microphone is plugged into the appropriate jack (3.5 mm).
[2] Pre-set the gain level of the microphone before coming on the air. This will
prevent the audio level of your voice varying every time you come on.
[3] Use the MIC button to toggle between on and off as indicated by the MIC
ON LED..
• Turning on AUTO AGC
[1] Press the AUTO AGC button (when the MIC ON LED is lit) and it will blink
rapidly to indicate that AGC mode is selected.
[2] You have the option to toggle this mode whether the MIC is on or off.
[3] Press the AUTO AGC button again to disable it.
• Viewing PLL Operating Voltage:
[1] Press both MIC and AUTO AGC at the same time.
[2] Volts will display in 1/10 of a volt accuracy.
[3] This mode can be saved as default by entering and exiting setup mode to
save frequency. (See setting the frequency)
[4] Press both keys again to return to normal mode.
• Volume levels:
[1] Make sure music source peaks remain below +3 dB. Any more level and
you introduce too much distortion.
[2] You should be able to set the microphone AGC once and then leave it
alone. Use the MIC switch to turn it on and off for regular operation.
• RF output level:
[1] The RF output level (internal resistor R36) is usually set once during the
Final Testing and Calibration stage.
[2] To increase your RF output power, rotate R36 CW. To decrease the RF
output power, rotate R36 CCW.
[3] Set R36 only as high as needed for your specific application within the
FCC Part 15 limitations.