RF-T860 Optical Transmitter
Page 8
Installation and Operation Manual
5. The “RF Level”(Refer to the RF input signal) lamp is lit red first and turns
green when the RF input signal is applied.
6. Reset or resort to the supply
If the transmitter is not in proper order, the above three lamps are lit red, the
LCD show alarm message and remind the user to turn off the machine, the
software would reset automatically, otherwise, please press the RESET key
to repeat step 3 above.
Important: If the machine still can not work after
you press the RESET key for several times, please cut off the power
and contact the supplier.
7. Input RF Signal
When the transmitter is in normal working status, input RF signal and the
“RF Level” Lamp will turn green.
8. MGC/AGC
Set the “ALC/MGC Switch” to “MGC” side and adjust the RF attenuator until
the RF Test Port level equals the value listed in Table below: (the suggested
monitoring frequency is 543.25MHz)
Also you can set the “ALC/MGC Switch” to “ALC” side and do not need any
adjustment. (The RF Test Port Level should be maintained on 75-85dB
μ
V).
Please note that in this case the laser input level Vi= P
√
N, P represents the
level of one channel, N stands for the channel number. The supposed channel
number of this transmitter is 59. If the channel number is below 59, the machine
will automatically boosts the laser input level to maintain the same Vi, so the RF
Test Port Level will increase, and the output level of the Optical Receiver in this
system will also increase.
4.5 dBm Link Loss via per 10 kilometers
Address:
RF Test Port Level
dBµV
Laser Bias Current
mA
Optical Power
mW
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