RF Loopback is under Radio, Diagnostics, Loopback
RF Loopback is quite intrusive—expect the link to go down during this test!
RF Loopback allows you to test one radio at a time—mute all of the other radios that you’re not testing. (Be sure to mute the far end radio as well!)
RF Loopback provides 60-70 dB of attenuation, good MSE, and zero defective blocks.
Select a fixed modulation mode, disable Adaptive Tx power admin, and set the Tx power to maximum.
Under Radio, Diagnostics, Loopback, turn “On” RF Loopback, and observe the following:
- Go to Radio, Radio Parameters
- The RX Level should be 60-70 dB less than the Operational TX Level
- For example, if the TX Level is 22 dBm, the RX Level should be -38 to -48 dBm
- MSE at -40 dB or lower
- Zero defective blocks
If the radio doesn’t pass this test, consider replacing the hardware! (You might have a bad transmitter or receiver.)
Note that you can also select IF loopback for PTP 820G to test the IF cable up the tower.
Use in good health!