RPR 550IS Series
TM1188 Issue 1Page 5 - 16
Table 1: RPR 551IS Radio Board DC Voltage Levels
COMPONENT COLLECTOR BASE EMITTER REMARKS
TR101 0.98 0.94 0.22 RF amplifier
TR102 0.96 0.92 0.21 Oscillator
TR103 0.88 0.68 - Mixer
XL101 0.92 - - Local oscillator crystal
NOTE: The voltages listed above were measured with a battery terminal voltage of 1.3V,
the 1V line at 1.05V and SK2 pin 4 connected to common.
Table 2: RPR 552IS Radio Board DC Voltage Levels
COMPONENT COLLECTOR BASE EMITTER REMARKS
TR201 0 0.77 0 RF amplifier
TR202 0.90 1.0 0.30 RF amplifier
TR203 1.0 1.0 0.32 Oscillator
TR204 0.75 0.5 0 Mixer
XL201 1.0 - - Local oscillator crystal
NOTE: The voltages listed above were measured with a battery terminal voltage of 1.3V,
the 1V line at 1.04V and SK2 pin 4 connected to common.
Table 3: RPR 553IS Radio Board DC Voltage Levels
COMPONENT COLLECTOR BASE EMITTER REMARKS
TR301 0.76 0.74 0 RF amplifier
TR302 0.99 0.98 0.25 RF amplifier
TR303 0.72 0.73 0 Mixer
TR304 0.98 0.99 0.3 Oscillator
TR305 0.68 0.70 0 Tripler
L307/C314 0.99 - - Local oscillator crystal
NOTE: The voltages listed above were measured with a battery terminal voltage of 1.3V,
the 1V line at 1.04V and SK2 pin 4 connected to common.
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