Hytera HD705 - Page 400

UHF5 (806-941MHz) Information Service Manual
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Description of Normal Situations:
[1] Output voltage at Q9022 PIN 3: about 3.25V.
[2] Output voltage at U606 PIN5 or input voltage at Q9022 PIN4: about 3.3V.
[3] Vbe: about 0.84V; Vce: about 2.65V (in the case of no signal reception).
[4] For Q9018, Vbe: about 0.76V; Vce: about 0.95V;
for Q9017, Vbe: about 0.7V; Vce: 0.85V (in the case of no signal reception).
[5] Cut off the front-end circuit, and input a 73.35MHz IF signal at TP402 to test IF sensitivity. Normally,
the IF sensitivity is -109dBm.
[6] Frequency of Q403: 71.1/75.6MHz.
[7] Frequency of L411: 18MHz.
[8] Input a -30dBm RF signal at the antenna connector and test at C9120. Normally, gain>13dB, output
signal>-17dBm.
[9] Input a -30dBm RF signal at the antenna connector and test at R9005 (do not cut off the back-end
circuit). Normally, gain>1dB, output signal>-29dBm.
[10] Signal frequency: RF±IF, signal amplitude>0dBm.
[11] For input of -80dBm signal at L9022, gain>25dB, output signal>-55dBm;
for input of -30dBm signal, output signal<-20dBm.
[12] The input signal at the antenna connector, with standard tuning information (AF=1KHz, FM=3KHz),
is -47dBm.