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Summary of Contents for Blitz MJ-398U
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Page 1: Instruction Manual
BLITZ MJ-398U BLITZ MJ-398U FM TRANSCEIVERS Instruction Manual... -
Page 2: Specifications
BLITZ MJ-398U SPECIFICATIONS GENERAL Frequency Range 245.0000~245.9875 －10℃~＋55℃ Working Temperate Power Supply Requirement DC 7.2V Operate Mode Simplex or Semi-duplex ≤1.6A(transmit 4W) Current Consumption Sensitivity Adjust 2~20mV Antenna impedance 50Ω TRANSMITTER Frequency Stability ± 5ppm ≤5W Output Power ≤±5KHz Max Frequency Deviation ≤10%... -
Page 3: Circuit Description
BLITZ MJ-398U CIRCUIT DESCRIPTION 1. Frequency configuration The receiver utilizes double conversion. The first IF is 38.85MHz and the second IF is 450kHz. The first local oscillator signal is supplied from the PLL circuit. The PLL circuit in the transmitter generates the ecessary frequencies. Fig. 1 shows the frequencies. - Page 4 BLITZ MJ-398U 2) First Mixer The signal from the RF amplifier is heterodyned with the first local oscillator signal from the PLL frequency synthesizer circuit at the first mixer (T202) to create a 38.85MHz first intermediate frequency (1st IF) signal. The first IF signal is then fed through crystal filters (FL231,FL232) to further remove spurious signals.
- Page 5 BLITZ MJ-398U 3) UNLOCK DETECTOR If a pulse signal appears at the LD pin of U301, an unlock condition occurs, and the DC voltage obtained from D309, and C306 causes the voltage applied to the PLL-LD pin of the microprocessor to go low. When the microprocessor detects this condition, the transmitter is disabled, ignoring the push-totalk switch input signal.
- Page 6 BLITZ MJ-398U 1)Memory Circuit Memory circuit consists of the CPU (U811) and an EEPROM(U821).An EEPROM has a capacity of 32k bits that contains the transceiver control program for the CPU and data such as Transceiver channels and operation features 2)Low Battery Warning The battery voltage is checked using by the microprocessor.
- Page 7 BLITZ MJ-398U ADJUSTMENT Required Test Equipment The following items are required to adjust radio parameters: 1. Regulated power supply Supply voltage: 5-14V DC Current: 3A or more 2. Digital multimeter Voltage range: FS = Approx. 20V Current: 10A or more Input resistance: High impedance 3.
- Page 8 BLITZ MJ-398U Output impedance: 600, unbalanced 10.Distortion meter/SINAD meter Measurable frequency: 1kHz Input level: Up to 40dB Distortion: 1% - 100% 11.Frequency counter Measurable frequency: Up to 200MHz Measurable stability: Approx. +/-0.1ppm 12.Linear detector Measurable frequency: Up to 200MHz Characteristics: Flat...
- Page 9 BLITZ MJ-398U Designator Component Designator Component C100 470P C200 C102 470P C201 C104 C202 C106 470P C203 C107 470P C204 C111 C205 C112 470P C206 C113 102P C207 470P C114 470P C208 470P C115 104P C210 470P C118 C211 470P...
- Page 10 BLITZ MJ-398U Designator Component Designator Component C262 104P C392 103P C281 473P C400 102P C282 104P C401 100P C284 221P C412 104P C291 103P C413 470P C292 103P C417 104P C293 470P C418 273P C294 470P C419 222P C302 104P...
- Page 11 BLITZ MJ-398U Designator Component Designator Component C818 104P D332 HVC350 C820 103P D337 HVC350 C821 104P D350 HVC350 C822 103P D351 HVC350 C824 104P D361 MA2S11 C825 D416 DAN222 C826 D417 1SS372 C827 103P D493 1SS372 C831 102P D813 C832...
- Page 12 BLITZ MJ-398U Designator Component Designator Component L112 R104 L113 R105 680Ω L114 R106 22Ω L118 R107 680Ω L119 2.2nH R111 10Ω L126 101T R113 47Ω L128 R114 L139 220nH R115 120K L201 R123 0Ω L202 R125 L203 R126 L204 R128 47Ω...
- Page 13 BLITZ MJ-398U Designator Component Designator Component R221 0Ω R361 R222 R370 680Ω R223 220Ω R371 120K R224 R372 R225 R373 R226 470Ω R374 100Ω R227 47Ω R375 R235 470Ω R376 220Ω R236 R377 R237 680K R391 R243 180K R392 R244 3.3K...
- Page 14 BLITZ MJ-398U Designator Component Designator Component R485 SP401 R491 SW400 CALL R492 100K SW401 MONI R493 0Ω SW402 R494 SW811 RD840G R514 SW812 RD82-TD2 R515 T101 2SC4226 R516 T102 2SC3357 R517 T105 2SK3078 R518 T107 2SK3476 R519 T161 DTC114EE R520...
- Page 15 BLITZ MJ-398U JN0304 JN0205 Designator Component Designator Component C710 100P C720 104P C711 100P C724 103P C712 100P C725 103P C713 100P E720 10uF C714 100P L720 101T C715 100P L721 101T C716 100P R720 D717 PMSD4118 R721 D718 PMSD4118 R722 330Ω...
- Page 19 BA TT TX Path TX/R X VCO Antenna RX Path Control e r 2SJ243 /U MC4 A PC S ense N JM2904V PLL-LD PLL-LD PLL-CS PLL-CS PLL Ci r c uit APC /Tune A PC BA TT PLL-CLK LMX 2332 PLL-Data R X VCO 32.768K Hz...
- Page 20 R307 P-TX P-TX C302 150R T361 E302 L324 C307 2SC4617(S) L363 104P 4.7uF RV307 C311 100nH C195 C196 R133 104P 101P 101T 104P 470P C129 E126 R361 D361 C361 C362 C363 R344 R346 R103 L103 C125 R125 470P R143 R139 CR340 MA2S11 C115...
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