Service Manual
24
Description:
[1] The lock range for the TX VCO is 1612~1740MHz, and the output amplitude is over -15dBm.
[2] The output power is 27~30dBm during normal open-loop transmission.
[3] The spring plate is flexible and is securely connected with the antenna connector.
[4] When U4103 is normal, Pin4=6.5V, Pin6=0V
[5] When U4102 is supplied normally, Pin15/Pin16=2.8V, Pin9/Pin10/Pin11/Pin12=3.7V, Pout=28～
31dBm.
[6] When U4002 outputs normally, Pin6=3.0V, Pout=about 0dBm.
[7] U4001 outputs 806~870MHz Tetra signal and the amplitude is about -15~-5dBm.
[8] I/Q signal input at Pin20/Pin61: Detect the I/Q signal via an oscilloscope. In normal situation, it is the
modulation signal loaded on the 1.6V DC voltage, and its Vp-p is above 50mV.
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