Motorola Gp328 Gp338 Detailed 6804110j64 F Manual
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Troubleshooting charts6C-39IF Signal at L311?No RF Signal at T301?RF Signal at C310?NoRF Signal at C307?NoRF Signal at C301?No orCheck harmonic filters L101 & L102 and ant. switches CR101, CR102, L104Check filter between C301 & C307; program filter to schematic test freq and check varactor voltages.Inject RF into J101Are varactor voltages OK?NoYe sCheck RF amp (Q301) Stage.Check filter between C310 & T301.Ye sCheck T301, T302, CR306, R308, R309, R310Ye s1st LO O/P OK? Locked?Ye sCheck FGUYe sTrace IF signal from L311 to Q302. Check for bad XTAL filter.NoYe sQ302 collec- tor OK? IF signal present?Before replacing U301, check U301 voltages; trace IF signal path.Ye sCheck for 2.6 VDCIs R5 present?Check Q210, U201 (pin 48) voltages and U247No No NoCheck U404 voltage. U404 can be selected by MCU before replacing U404.Check varactor filter.NoYe sYe sYe sAABweak RFTroubleshooting Flow Chart for Receiver (Sheet 2 of 2)
6C-40Troubleshooting chartsSTARTNo PowerIs There B+ Bias for Ant switchC h e c k Q 111Is Current OK?Is Control Volt- age High or LowCheck PCIC1. Check Pin Diodes 2. Check Harmonic FilterInspect/Repair Tx. Output NetworkIs Power OK?DoneCheck Drive to ModuleIs Drive OK?Troubleshoot VCOInspect PA Network/ Check Power Out of U101 at Cap C160Is Power OK?Replace U101Is Power OK?Replace Q101DoneDoneNo Ye s Ye sNo No Ye sLow High No Ye s Ye s No Ye s NoTroubleshooting Flow Chart for Transmitter
Troubleshooting charts6C-415V at pin 6 of CR201Is information frommP U409 correct?Is U201 Pin 18 AT 4.54 VDC?Is U201 Pin 47 AT = 13 VDCIs U241 Pin 19 4.3 VDC in TX?StartVi s u a l check of the Board OK?Correct ProblemCheck 5V Regulator+5V at U201 Pin’s 13 & 30?Is 16.8MHz Signal at U201 Pin 19?Check FL201, C206, C207, C208, CR203 & R204Are signals at Pin’s 14 & 15 of U201?Check L202Check Q260, Q261 & R260U201 pin 2 at >3VinTxand -30 dBm?Are R231,R232, R233,C231,C232, & C233 OK?Replace U201If L261, C263 & C264 are OK, then see VCO troubleshooting chartAre Waveforms at Pins 14 & 15 triangular?Do Pins 7,8 & 9 of U201 toggle when channel is changed?Check programming lines between U409 and U201 Pins 7,8 & 9Replace U201Check uP U409 Troubleshooting ChartNO YES NO YES NO YES NO YESNO NO NO YES YESNOYES YESNO YES YES YES NONO NO NO YES NO YES YESCheck CR201, U210, U211, C258, C259 & C2283.3V at U201 pins 5, 20, 34 & 36Check U248, L201 & L202Is 16.8MHz signal at U201 pin 23?Replace U201YES NO NO YES NO YESTroubleshooting Flow Chart for Synthesizer
6C-42Troubleshooting chartsSTARTNo LO?Tx Carrier?VCO OKCheck R260TRB = 5V?Pin 10 >1V?L253 O/C?Change L253Change U241AUX 3 High?Check U201 Pin 2 for 3.2VPin 19 =0VAUX 4 High?Change Q261Vctrl0V or 13V?L243 Open Circuit?Change U241Change L243Change U201Check for faulty parts or dry joints of L271, L273, C370, C386, R339 & L320A ANo No Ye s Ye s Ye s No NoYe sYe s Ye s No Ye sNoNoYe sYe sNo NoCheck R245 for dry joint or faultyNoTroubleshooting Flow Chart for VCO
6D-1Section 6D MODEL CHART AND TEST SPECIFICATIONS (330-400 MHZ)1.0 Model ChartGP Series, 330-400 MHzModel DescriptionAZH25PDC9AA3GP328 330-400 MHz 4W 16 CHAZH25PDH9AA6 GP338 330-400 MHz 4W 128 CHItem DescriptionXPMUD1536GP328 Super Tanapa 330-400 MHz 4W X PMUD1537 GP338 Super Tanapa 330-400 MHz 4WXPMUD1541GP328 Tanapa 330-400 MHz 4W X PMUD1542 GP338 Tanapa 330-400 MHz 4WXPMLD4136GP328 B/C Kit 330-400 MHz 4W X PMLD4137 GP338 B/C Kit 330-400 MHz 4WXPMLN4216GP328 Front Housing Kit X PMLN4199 GP338 Front Housing KitXXPMAD4009VHF 9 cm antenna (336-368 MHz) X X PMAD4020 VHF 9 cm antenna (370-400 MHz)X6804110J54GP328 User Guide X 6804110J55 GP338 User Guide x = Indicates one of each is required.
6D-2Specifications2.0 SpecificationsGeneralTransmitter ReceiverAll specifications are subject to change without notice.330-400MHzFrequency:330-400 MHz Channel Capacity: GP328 : 16 Channels GP338 : 128 ChannelsPower Supply:7.5 Volts±20% Dimensions with Standard High Capacity NiMH Battery: with Ultra High Capacity NiMH Bat- tery:137mm x 57.5mm x 37.5mm 137mm x 57.5mm x 40mmWeight: with Standard High Capacity NiMH Battery: with Ultra High Capacity NiMH Bat- tery:420 g 500 g Average Battery Life @ (5-5-90 Duty Cycle) Standard High Capacity NiMH Bat- tery: Ultra High Capac- ity NiMH Battery:Low Pow- er >11 hrs >14 hrsHigh Pow- er >8 hrs >11 hrsSealing:Passes rain testing per IP54 Shock: Meets MIL-STD-810- C,D & E and TIA/EIA 603Vibration:Meets MIL-STD-810- C,D & E and TIA/EIA 603 Dust: Meets MIL-STD-810- C,D & E and IP54Humidity:Meets MIL-STD-810- C,D & E and TIA/EIA 603330-400MHzRF Output NiMH @ 7.5V:Low 1WHigh 4W Frequency 330-400 MHzChannel Spacing12.5/20/25 kHz Freq. Stability (-30°Cto+60°C)0.00025%Spurs/Harmonics:-36 dBm < 1 GHz -30 dBm > 1 GHz Audio Response: (from 6 dB/oct. Pre- Emphasis, 300 to 3000Hz)+1, -3 dBAudio Distortion: @ 1000 Hz, 60% Rated Max. Dev.
Transmitter6D-33.0 Transmitter3.1 General(Refer to Figure 6-1) The VHF transmitter contains five basic circuits: 1.power amplifier 2.antenna switch 3.harmonic filter 4.antenna matching network 5.power control integrated circuit (PCIC).3.1.1 Power AmplifierThe power amplifier consists of two devices: 1.9Z67 LDMOS driver IC (U101) and 2.PRF1507 LDMOS PA (Q110). The 9Z67 LDMOS driver IC contains a 2 stage amplification with a supply voltage of 7.3V. This RF power amplifier is capable of supplying an output power of 0.3W (pin 6 and 7) with an input signal of 2mW (3dBm) (pin16). The current drain would typically be 160mA while operating in the frequency range of 330-400MHz. The PRF1507 LDMOS PA is capable of supplying an output power of 7W with an input signal of 0.3W. The current drain would typically be 1300mA while operating in the frequency range of 330- 400MHz. The power output can be varied by changing the biasing voltage.Figure 6-1: Transmitter Block DiagramPCIC Antenna PA DriverVcontrolVcontrolFrom VCOJackPA - F i n a l StageAntenna Switch/ Harmonic Filter/ Matching Network
6D-4Transmitter3.1.2 Antenna SwitchThe antenna switch circuit consists of two PIN diodes (CR101 and CR102), a pi network (C107, L104 and C106), and two current limiting resistors (R101, R170). In the transmit mode, B+ at PCIC (U102) pin 23 will go low and turn on Q111 where a B+ bias is applied to the antenna switch circuit to bias the diodes on. The shunt diode (CR102) shorts out the receiver port, and the pi network, which operates as a quarter wave transmission line, transforms the low impedance of the shunt diode to a high impedance at the input of the harmonic filter. In the receive mode, the diodes are both off, and hence, there exists a low attenuation path between the antenna and receiver ports.3.1.3 Harmonic FilterThe harmonic filter consists of C104, L102, C103, L101 and C102. The design of the harmonic filter for VHF is that of a modified Zolotarev design. It has been optimized for efficiency of the power module. This type of filter has the advantage that it can give a greater attenuation in the stop-band for a given ripple level. The harmonic filter insertion loss is typically less than 1.2dB.3.1.4 Antenna Matching NetworkA matching network which is made up of L116 is used to match the antennas impedance to the harmonic filter. This will optimize the performance of the transmitter and receiver into an antenna.3.1.5 Power Control Integrated Circuit (PCIC)The transmitter uses the Power Control IC (PCIC), U102 to regulate the power output of the radio. The current to the final stage of the power module is supplied through R101, which provides a voltage proportional to the current drain. This voltage is then fedback to the Automatic Level Control (ALC) within the PCIC to regulate the output power of the transmitter. The PCIC has internal digital to analog converters (DACs) which provide the reference voltage of the control loop. The reference voltage level is programmable through the SPI line of the PCIC. There are resistors and integrators within the PCIC, and external capacitors (C133, C134 and C135) in controlling the transmitter rising and falling time. These are necessary in reducing the power splatter into adjacent channels. CR105 and its associated components are part of the temperature cut back circuitry. It senses the printed circuit board temperature around the transmitter circuits and output a DC voltage to the PCIC. If the DC voltage produced exceeds the set threshold in the PCIC, the transmitter output power will be reduced so as to reduce the transmitter temperature.
Receiver6D-54.0 Receiver4.1 Receiver Front-End(Refer to330-400MHz Receiver Front End Schematic Diagramon page 6D-16 and330-400MHz Transmitter Schematic Diagramon page 6D-20) The RF signal is received by the antenna and applied to a low-pass filter. For VHF, the filter consists of L101, L102, C102, C103, C104. The filtered RF signal is passed through the antenna switch. The antenna switch circuit consists of two PIN diodes(CR101 and CR102) and a pi network (C106, L104 and C107).The signal is then applied to a varactor tuned bandpass filter. The VHF bandpass filter comprises of L301, L302, C302, C303, C304, CR301 and CR302. The bandpass filter is tuned by applying a control voltage to the varactor diodes(CR301 and CR302) in the filter. The bandpass filter is electronically tuned by the DACRx from U404 which is controlled by the microprocessor. Depending on the carrier frequency, the DACRx will supply the tuned voltage to the varactor diodes in the filter. Wideband operation of the filter is achieved by shifting the bandpass filter across the band. The output of the bandpass filter is coupled to the RF amplifier transistor Q301 via C307. After being amplified by the RF amplifier, the RF signal is further filtered by a second varactor tuned bandpass filter, consisting of L306, L307, C313, C317, CR304 and CR305. Both the pre and post-RF amplifier varactor tuned filters have similar responses. The 3 dB bandwidth of the filter is about 50 MHz. This enables the filters to be electronically controlled by using a single control voltage which is DACRx .Figure 6-2: VHF Receiver Block DiagramDemodulator SynthesizerCrystal Filter Mixer Va r a c t o r Tuned Filter RF Amp Va r a c t o r Tuned Filter Pin Diode Antenna Switch RF Jack Antenna AGC Control Voltage from ASFICFirst LO from FGU Recovered Audio Squelch RSSI IFIC SPI Bus 16.8 MHz Reference Clock Second LO VCO U301IF Amp
6D-6ReceiverThe output of the post-RF amplifier filter which is connected to the passive double balanced mixer consists of T301, T302 and CR306. Matching of the filter to the mixer is provided by C381. After mixing with the first LO signal from the voltage controlled oscillator (VCO) using low side injection, the RF signal is down-converted to the 45.1 MHz IF signal. The IF signal coming out of the mixer is transfered to the crystal filter (FL301) through a resistor pad and a diplexer (C322 and L310). Matching to the input of the crystal filter is provided by C324 and L311. The crystal filter provides the necessary selectivity and intermodulation protection.4.2 Receiver Back-End(Refer to330-400MHz Receiver Back End Schematic Diagramon page 6D-17) The output of crystal filter FL301 is matched to the input of IF amplifier transistor Q302 by components R352 and C325. Voltage supply to the IF amplifier is taken from the receive 5 volts (R5). The IF amplifer provides a gain of about 7dB. The amplified IF signal is then coupled into U301(pin 3) via C330, C338 and L330 which provides the matching for the IF amplifier and U301. The IF signal applied to pin 3 of U301 is amplified, down-converted, filtered, and demodulated, to produce the recovered audio at pin 27 of U301. This IF IC is electronically programmable, and the amount of filtering (which is dependent on the radio channel spacing) is controlled by the microprocessor. Additional filtering, once externally provided by the conventional ceramic filters, is replaced by internal filters in the IF module (U301). The IF IC uses a type of direct conversion process, whereby the externally generated second LO frequency is divided by two in U301 so that it is very close to the first IF frequency. The IF IC (U301) synthesizes the second LO and phase-locks the VCO to track the first IF frequency. The second LO is designed to oscillate at twice the first IF frequency because of the divide-by-two function in the IF IC. In the absence of an IF signal, the VCO will “search” for a frequency, or its frequency will vary close to twice the IF frequency. When an IF signal is received, the VCO will lock onto the IF signal. The second LO/VCO is a Colpitts oscillator built around transistor Q320. The VCO has a varactor diode, CR310, to adjust the VCO frequency. The control signal for the varactor is derived from a loop filter consisting of C362, C363, C364, R320 and R321. The IF IC (U301) also performs several other functions. It provides a received signal-strength indicator (RSSI) and a squelch output. The RSSI is a dc voltage monitored by the microprocessor, and used as a peak indicator during the bench tuning of the receiver front-end varactor filter. The RSSI voltage is also used to control the automatic gain control (AGC) circuit at the front-end. The demodulated signal on pin 27 of U301 is also used for squelch control. The signal is routed to U404 (ASFIC) where squelch signal shaping and detection takes place. The demodulated audio signal is also routed to U404 for processing before going to the audio amplifier for amplification.