JETStream JT220M Service Manual
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JETStream JT220M Service Manual

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See also: User Manual
General
Frequency Range
RX
TX
Number of channels
Operation mode
Channel Stepping
Antenna Impedance
Working temperature
Power Supply
Grounding Method
Current
Frequency Stability
Dimensions (W x H x D )
Weight
RECEIVER
Circuitry
Intermediate Frequency (1st / 2nd)
Sensitivity (12dB SINAD)
Selectivity
–6dB
–60dB
Squelch Sensitivity
Audio Output (8Ω, 10% distortion)
TRANSMITTER
Power Output
High
Mid
Low
Modulation
Scattering transmit
Maximum Frequency Deviation
Impedance of Microphone

SPECIFICATIONS

216~280MHz
222~225MHz
100
FM 16K0F3E (Wide mode)/8K50F3E (Narrow mode)
5, 8.33, 10, 12.5, 15, 20, 25, 30, 50KHz
50Ω
–10℃~+60℃ (–14℉~+140℉)
13.8V DC±15% (11.7~15.8V)
Negative ground
Transmitter: about 9.0A
Receiver: about 600mA(max.) 400mA (noise reductions)
±2.5ppm
145 x 47 x 190 mm
Approx. 1.2kg / 2.6lb
Double conversion superheterodyne
38.85MHz / 450kHz
Wide : 0.25μV or less
Wide : 12kHz or more
Wide : 28kHz or less
0.1μV
2.0W
50W
10W
About 5W
Changeable impedance
-60dB or less than-60dB
Wide :±5kHz, Narrow :±2.5kHz
2KΩ
Narrow : 0.35μV or less
Narrow : 6kHz or more
Narrow : 14kHz or less
JT220M

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Summary of Contents for JETStream JT220M

  • Page 1: Specifications

    JT220M SPECIFICATIONS General Frequency Range 216~280MHz 222~225MHz Number of channels Operation mode FM 16K0F3E (Wide mode)/8K50F3E (Narrow mode) Channel Stepping 5, 8.33, 10, 12.5, 15, 20, 25, 30, 50KHz Antenna Impedance 50Ω Working temperature –10℃~+60℃ (–14℉~+140℉) Power Supply 13.8V DC±15% (11.7~15.8V)

  • Page 2: Block Diagram

    JT220M BLOCK DIAGRAM Q210 2SC4226 RX: 216.000-280.000 TX: 222.000-225.000 Q223 Q214 D210,D211 Q217 Q209 Q207 D203 Q220 Q212 Q216 2SA1832(GR) RD07 L407CDB 2SK1875 2SC4226 2SC4226 DAN235E 2SC3357 2SK3078 MRF7042 CHARGE DRIVE FINAL PUMP T/R SW DRIVE ANT SW BUFF LOOP...

  • Page 3: Circuit Description

    JT220M CIRCUIT DESCRIPTION Frequency configuration The receiver utilizes double conversion. The first IF is 38.850 MHz 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 necessary frequencies. Fig. 1 shows the frequencies.

  • Page 4: First Mixer

    JT220M CIRCUIT DESCRIPTION  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 (Q205) to create a 38.850MHz first intermediate frequency (1st IF) signal. The first IF signal is then fed through one pair of monolithic crystal filter (MCF : XF200 XF201) to further remove spurious signals.

  • Page 5: Squelch Circuit

    JT220M CIRCUIT DESCRIPTION  Squelch Circuit The detection output from the FM IF IC (U200) passes through a noise amplifier (U201 2/2) to detect noise. A voltage is applied to the CPU (U2). The CPU controls squelch according to the voltage (SQIN) level.

  • Page 6: Power Amplifier Circuit

    JT220M CIRCUIT DESCRIPTION high and Q104 turns on. Q102 turns on and a voltage is applied to (8T). The CPU in the control unit monitors the PLL (U205) LD signal directly. When the PLL is unlocked during transmission, the PLL LD signal goes low. The CPU detects this signal and makes the TXC signal low.

  • Page 7: Control Circuit

    JT220M CIRCUIT DESCRIPTION at the antenna end and to stabilize transmission output at voltage and temperature variations. (See Fig. Q220 Q212 Q214 Q216 D210,D211 RF AMP DRIVE STAGE D203 DRIVE AMP FINAL AMP ANT SW POWER D230,D231 U204 VR200 U505...
  • Page 8 JT220M CIRCUIT DESCRIPTION COM 0~COM 3 SEG0~SEG27 driver Q6,Q7 BLUE Fig. 12 Display circuit  Encode The CTCSS and DCS signal that is output from CPU(U2) of P31 pass through two-way digital switches and buffer amplifier(U8A) to amplify. The DTMF signal that is output from DTMF encoder passes through buffer amplifier (U8A) to amplify, and amplified by the other U504 (B/4) to perform IDC operation.

  • Page 9: Power Supply Circuit

    JT220M CIRCUIT DESCRIPTION  D/A Converter The D/A converter (U505) is used to adjust MO modulation, AF volume, TV voltage, FC reference voltage, and PC POWER CONTROL voltage level. Adjustment values are sent from the CPU as serial data. The D/A converter has a resolution of 256 and the following relationship is valid.

  • Page 10: Pcb Section

    JT220M ADJUSTMENT PCB Section Measurement Adjustment Specifications Item Condition Test equipment Terminal Parts Method /Remarks 1. Setting 1) Power supply voltage DC Power supply terminal : 13.8V 1) CH: TX high CV201 3.3 V ±0.5V 2. VCO lock Digital voltmeter...

  • Page 11: Receiver Section

    JT220M ADJUSTMENT Transmitter section Measurement Adjustment Specifications Item Condition /Remarks Test equipment Terminal Parts Method ±1.7~2.0kHz 8. MIC 1) CH : TX center (Narrow) Modulation Check sensitivity 2) AG : 1kHz/4mV analyzer or linear (Narrow) 3) Transmit detector (LPF15kHz) Oscilloscope AF.

  • Page 12: Display Unit

    JT220M PARTS LIST DISPLAY UNIT Ref. No Parts No. Description of item Size (LxW)(mm) Specification C1-C6 SMT CAPACITOR 0603 104±10% 50V C7-C20 SMT CAPACITOR 0603 102±10% 50V C21-C30 SMT CAPACITOR 0603 103±10% 50V C31-C32 SMT CAPACITOR 0603 105±10% 50V C33-C34...
  • Page 13 JT220M PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification SMT RESISTOR 0603 51K±5% SMT RESISTOR 0603 33K±5% R27-R35 SMT RESISTOR 0603 10K±5% SMT RESISTOR 0603 220K±5% R37-R46 SMT RESISTOR 0603 47K±5% R47-R48 SMT RESISTOR 0603 12K±5%...
  • Page 14 JT220M PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification Q1-Q2 SMT DIGITAL TRANSISTOR EMT3 DTC114EE Q3-Q4 SMT DIGITAL TRANSISTOR EMT3 DTC144EE Q5-Q6 SMT TRANSISTOR SOT-23 2SC1623 TRANSISTOR TO-92 2SD468 SMT IC TO-92 HT7550-1 SMT IC QFP80...

  • Page 15: Main Unit

    JT220M PARTS LIST MAIN UNIT Ref. No Parts No. Description of item Size (LxW)(mm) Specification C100-C104 SMT CAPACITOR 0603 ±10% 50V C105-C109 0603 SMT CAPACITOR ±10% 50V C110-C111 0603 SMT CAPACITOR ±10% 50V C112-C113 SMT CAPACITOR 0805 ±10% 50V C200-C213...
  • Page 16 JT220M PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification C270 SMT CAPACITOR 1210 ±10% 50V C271-C280 0603 SMT CAPACITOR ±10% 50V C281 SMT CAPACITOR 0805 470P ±10% 50V C282-C283 0603 SMT CAPACITOR ±10% 50V C284 SMT CAPACITOR 1206 ±10% 50V...
  • Page 17 JT220M PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification C315 SMT CAPACITOR 0603 NOUSE 470P C316 SMT CAPACITOR 0603 ±10% 50V C317 SMT CAPACITOR 0603 NOUSE C318-C319 SMT CAPACITOR 1206 NOUSE C320 SMT CAPACITOR 0603 103±10% 50V...
  • Page 18 JT220M PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification C362 SMT CAPACITOR 0603 7P±0.25P 50V C363 SMT CAPACITOR 1210 8P±5% 50V C364-C366 SMT CAPACITOR 0603 10P±5% 50V C367 SMT CAPACITOR 0603 10P±0.25P 50V C368 SMT SMALL FIXED INDUCTOR...
  • Page 19 JT220M PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification C403 SMT CAPACITOR 0603 0.75P±0.1P 50V C404 SMT CAPACITOR 0603 22P±5% 50V C405 SMT CAPACITOR 0603 18P±5% 50V C406 SMT CAPACITOR 0603 103±10% 50V C407 SMT CAPACITOR 0603 27P±5% 50V...
  • Page 20 JT220M PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification C554 SMT CAPACITOR 0603 272±5% 50V C556 SMT CAPACITOR 0603 102±5% 50V C557 SMT CAPACITOR 0805 105±10% 50V C558 SMT CAPACITOR 0603 332±5% 50V C559 SMT CAPACITOR 0603 680P±5% 50V...
  • Page 21 JT220M PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification E519 ELECTRO 4×8 4.7uF16V E520 ELECTRO 4×8 10uF16V E521 ELECTRO 8×15 330uF25V E522 SMT TANTALUM CAPACITOR A type 2.2uF±20% 10V E523 SMT TANTALUM CAPACITOR A type 2.2uF±20% 16V...
  • Page 22 JT220M PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification R230 SMT RESISTOR 0603 1K±5% R231 SMT RESISTOR 0603 470R±5% R232 SMT RESISTOR 0603 NOUSE R233 SMT RESISTOR 2010 470R±5% R234-R235 SMT RESISTOR 0603 470R±5% R236-R237 SMT RESISTOR 0603 100R±5%...
  • Page 23 JT220M PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification R280-R281 SMT RESISTOR 0603 10K±5% R282 SMT RESISTOR 0603 0R±5% R283-R284 SMT RESISTOR 0603 NOUSE R285 SMT RESISTOR 0603 100R±5% R286 SMT RESISTOR 0603 100K±5% R287 SMT RESISTOR...
  • Page 24 JT220M PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification R321 SMT RESISTOR 0603 1K±5% R322 SMT RESISTOR 0603 NOUSE R323 SMT RESISTOR 0603 18K±5% R325 SMT RESISTOR 1206 68R±5% R326 SMT RESISTOR 0603 470R±5% R327 SMT RESISTOR 0603 330R±5%...
  • Page 25 JT220M PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification R511-R517 SMT RESISTOR 0603 1K±5% R518 SMT RESISTOR 0603 10K±5% R519 SMT RESISTOR 0603 2K±5% R520 SMT RESISTOR 0603 1K±5% R521 SMT RESISTOR 0603 20K±5% R522 SMT RESISTOR 0603 22K±5%...
  • Page 26 JT220M PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification R568 SMT RESISTOR 0603 56K±5% R569 SMT RESISTOR 0603 12K±5% R570 SMT RESISTOR 0603 68K±5% R571 SMT RESISTOR 0603 25.5K±1% R572 SMT RESISTOR 0603 5.11K±1% R573 SMT RESISTOR 0603 634K±1%...
  • Page 27 JT220M PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification D205-D208 SMT VARIABLE CAPACITANCE DIODE SC-79 HVC350 D210-C211 DIODE DO-35 L407CDB D212-D213 SMT DIODE 1206 NOUSE D214 SMT DIODE SOT-523 NOUSE D215 SMT VARIABLE CAPACITANCE DIODE 0603...
  • Page 28 JT220M PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification Q200-Q201 SMT DUAL DIGITAL TRANSISTOR SC-88A UMC4N Q202 SMT DUAL DIGITAL TRANSISTOR SC-88A NOUSE Q203 SMT DIGITAL TRANSISTOR EMT3 DTA114YE Q204 SMT TRANSISTOR SC-70 2SC4215 SMT FET...
  • Page 29 JT220M PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification U204 SMT IC SSOP8 LM2904V U205 SMT IC SSOP20 LMX1511TM U500 SMT IC SOP16 MC33111 U501-U504 SMT IC SSOP14 NJM2902 U505 SMT IC SSOP24 M62364F U506 SMT IC...
  • Page 30 JT220M PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification L230-L231 SMT WIRE WOUND INDUCTOR 0805 NOUSE L232 SMT AIR-CORE COIL NOUSE L233-L234 SMT SMALL FIXED INDUCTOR 0603 10uH L235 SMT WIRE WOUND INDUCTOR 0805 33NH L236-L237...
  • Page 31 JT220M PC board views...
  • Page 32 JT220M PC board views...
  • Page 33 JT220M PC board views...
  • Page 34 JT220M PC board views...
  • Page 35 JT220M PC board views...
  • Page 36 JT220M PC board views...
  • Page 37 JT220M PC board views...
  • Page 38 JT220M PC board views...

  • Page 39: Schematic Diagram

    JT220M SCHEMATIC DIAGRAM R210 R272 R284 L200 R200 NOUSE 4P(B) 220R C321 TP204 C206 C410 C228 103P Q203 104P D201 R209 FM DEMODULATION R285 C204 C251 DTA114YE DAN235E C378 C372 FM RF AMP 100R R205 R207 R296 C295 103P R275...
  • Page 40 JT220M SCHEMATIC DIAGRAM R511 RX-IN C510 R541 102P DTMF-DET RX-OUT BUFFER AMP C520 D500 R543 R540 R501 104P NOUSE R508 NOUSE AUDIO/HPF C501 R573 C503 R526 103P R542 C529 634K-1% 103P R575 C564 FILTER R586 RX-A 100K NOUSE NOUSE NOUSE...
  • Page 41 JT220M SCHEMATIC DIAGRAM P100 2SB1386 MC7808 MC78L05 F100 Vout C100 C105 C106 C101 MAIN+DC13.8V 102P 102P R101 103P D100 E100 E101 103P E102 C102 E103 E104 C103 ZSA5A27 470uF/25V-10*16 C107 C109 470uF/25V-10*16 C110 47uF/25V 103P 47uF/25V C111 47uF/25V 103P P101...
  • Page 42 JT220M SCHEMATIC DIAGRAM POWER LED HT7550-1 LCD BACKLIGHT Vout LCD-5189W(GDH-706W) 470R orange 102P 102P 271T 271T 271T 104P 22uF/25V 47uF/10V 103P DTC114EE 102P 220R 103P 102P 220K MICG MICI VOLUME PASS ADJUAS TMENT POWER FUNC BL(BLUE) MICM 10K(RO9512NO-FB15A7.0-B103-005) DTC114EE DIMMER...

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