User's Manual

VCom Inc.
PA700 Manual; ml_pa700_03 (January 2005)
Approved: C.H.
14
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“My amp is cutting-in/cutting-out repeatedly”
“My amp is unstable”
The amp may be in shutdown mode due to an input level that is too high, or due to a high amount of
reverse-power being detected. Reverse-power is really reflected power – often caused by a fault between the
PA700 and the antenna, or by operation at a frequency outside of the DPX700 passband.
All LEDs are off
• Ensure that the PA700 is plugged in to the power source
• Check the FUSE led on rear panel; if the light is on, replace the fuse
• If failure persists please contact technical support
Only the MAINS led light is on, but enable does not work
• Check that all three enables (LOCAL, REMOTE, SOFTWARE) are present
• Check RF IN, RF REF and TEMPERATURE alarms
Enable ON, V
DC
absent
• Possible power supply fault
Enable and V
DC
ON, RF Output Power Absent
• Check that the input is valid
• Check for alarms. Some conditions result in muted output power.
Frequently occurring thermal protection conditions
• Check that air outlets are not obstructed
• Check the amount of dust on heatsink
Amplifier VSWR alarm condition
• Too much power is being reflected by the antenna/duplexer/cable feed
• Verify that connections and cables are intact
• Impedance at the duplexer must be 50 ohm
Amplifier mute due to over-drive
• Check the input level
• Input level and amplifier gain should not exceed +49 dBm
No gain
• Check the input and alarms
Too high output distortion
• Check the output power level. Output should not exceed 49 dBm.