Yaesu VR-901 Instruction Manual
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Yaesu VR-901 Instruction Manual

Yaesu VR-901 Instruction Manual

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INSTRUCTION
MANUAL
VR-901
YAESU MUSEN CO., LTD.
-JAPAN
TOKYO

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Summary of Contents for Yaesu VR-901

  • Page 1 INSTRUCTION MANUAL VR-901 YAESU MUSEN CO., LTD. -JAPAN TOKYO...
  • Page 2 Unit will allow operation. Installation is straightforward. We recommend that you read this manual in its entirety, so that you will better understand the many outstanding features of the YR-901 CW /RTTY Reader-another breakthrough from the hams at Yaesu. - 1 -...

  • Page 3: Specifications

    SPECIFICATIONS GENERAL CW MONITOR Character composition (video): Display modes: " 5 x 7 dot character Letters, Japanese Katakana characters, ( . , : ; ? - numbers, punctuation ( ) ) ;Page dimensions: operating symbols (BT, HH, AS, 3 2 characters x 16 lines Page capacity: Input error tolerance (editing feature): 51 2 characters...

  • Page 4: Available Options

    ACCESSORIES The following accessories are included with your YR-90 1: 3 pin phone plugs 2 ea. 6 pin DIN plug 1 ea. 7 pin DIN plug 1 ea. RCA pin plugs 5 ea. I, F /L CONTROL(Nu1 usc. d ) TTY OUTPUT'+ Note: When using type ASR33 or ASCII key­...

  • Page 5: Front Panel Controls And Switches

    FRONT PANEL CONTROLS AND SWITCHES CD CZ)@® @ CID CJ) ® CID@ @ @@ (1 ) POWER FSK 170 . . The YR-90 1 will now read frequency- shift keyed transmissions with a shift This is the main power on/off switch for the of 170 Hz.
  • Page 6 This switch selects the operating mode for the ( 1 4) SPEAKER memory system. The M position is a momentary The audio output from the receiver is fed to the switch position, which stores in memory all YR-90 speaker. characters posted on the TV screen up to the point where the lever is depressed.
  • Page 7 REAR PANEL CONTROLS, SWITCHES AND CONNECTIONS @@@@@ @ ® CD CV ® ® with optional Local Loop Unit), remove the (1 ) F. ADJ jumper between pins 2 and 3 of the 6-pin plug for This control sets the center frequency for the input this jack.

  • Page 8: Video Out

    absolutely certain to use a ·fuse of the proper rat­ ing. OUR WARRANTY DOES NOT COVER DAMAGE CAUSED BY USE OF AN IMPROPER FUSE. (9) Powe r -Cord The AC power cord emerges at this point. (10) VIDEO OUT The output video signal for your monitor television Fig.2 Speaker Plug appears at this jack.

  • Page 9: Installation

    INSTALLATION INSTALLATION CAUTION The YR-901 should be positioned near the station PERMANENT DAMAGE CAN RESULT IF IM­ transceiver so that the controls and switches are PROPER POWER IS APPLIED TO THIS INSTRU­ easily-accessible -from your operating position. MEN'f. OUR WARRANTY DOES-NOT COVER DAMAGE CAUSED BY IMPROPER POWER Before commencing operation check to see that...

  • Page 10: Operation

    NEG/POS ..POS using 300 ohm feed only. The video modulator is ACR .... OFF an available option. See your Yaesu dealer. POWER ..ON Advance the INPUT LEVEL control as neces­ We recommend that the television antenna be...

  • Page 12: Error Causes

    ERROR CAUSES continue copying while you are viewing the memory display, and when you return the switch to its center position, the copy will When the YR-901 cannot distinguish an incoming "#" include all text received while you were character, the symbol will appear on the viewing the memory display.
  • Page 13 TELETYPE RX MONITORING ( 4) Once the signal is properly tuned, advance the INPUT LEVEL control fully clockwise. ( I ) the YR-901 and station equipment as B y now, you should be monitoring on the shown in Figures 5 and 6. If it desired to use television screen the incoming RTTY message.
  • Page 14 TX/RX MONITORING For po sitive keying, the YR-901 KEY jacks display a key-up voltage of 12 volts, with a key-down Refer to Figure 8 for typical connection informa­ current of 50 mA. For negative keying, the key-up tion for CW operation. The keyer paddle is inserted voltage is -25 volts, with key down current of into the YR-901 rear apron KEY 2 jack, and then 25 mA.
  • Page 15 TELETYPE MACHINE/ASCII KEYBOARD CW However, if your keyboard lacks a 110 baud TX OR TX/RX OPERATION clock, please refer to Figure lO(c) for details of the proper connection. (1) Refer to Figure 9 , and connect the FT- 901 DM, YR-901, and your ASCII keyboard, ( 4) When using ASCII keyboard or ASR33 ASR32, or ASR33 machine.
  • Page 16 TELETYPE TX/RX OPERATION When vsing a keyboard or teletype machine for code generation, the FT-901DM KEYER SPEED control should be set fully counter­ Refer to Figure 9 for interconnection details. The proper connection of the Y0-901 Multi­ clockwise into the click-stop (manual posi- ·- scope is also shown, for cross pattern monitor­...

  • Page 17: Main Unit

    When you come to the end of the line, push the keyboard CR (Carriage Return) key twice, and the LF (Line Feed) key once, as needed, to ensure that the teletype machine on the other end responds properly. The motor auto start feature can be activated by flipping on the front panel A.

  • Page 18: Circuit Description

    CIRCUIT DESCRIPTION CPU, the teletype code is translated to Morse, and A full description of every logic state in the YR- the output drives the CW KEYING UNIT. The 901 is well beyond the scope of this manual. In output is also fed to the CRT DISPLAY UNIT order to help you understand the YR-901 better, we are presenting a simplified explanation of the for display on the monitor.

  • Page 19: Maintenance And Alignment

    MAINTENANCE AND ALIGNMENT KEYING POLARITY CHANGE The YR-901 should never require alignment, if it is not abused. Conditions of improper operation can When using a transceiver utilizing negative keying usually be traced to insufficient input level, poor (see list on page 13 ), the output polarity from sending on the other end, or parts failure in the the CW KEYING UNIT must be changed.
  • Page 21 TELETYPE BAUD CHANGE LOCAL LOOP UNIT INSTALLATION (OPTION) The YR-901 comes equipped for 45.5 and 50 baud When using an ASR2 8 type machine, the current operation. If you desire to use 57 and 75 baud, a requirements of the machine must be met. The simple modification is required.
  • Page 22 FSK BANDPASS FILTER ADJUSTMENT < < < < Set the MODE switch to the FSK/ 170 posi­ � � tion, and connect a precision audio signal < generator to the AF IN jack. Set its output to < 1 -volt at 2125 Hz. Now adjust VR606 for �...

  • Page 23: Parts List

    PARTS LIST P l 0 9 (with w ire) T 9 2 0 1 6 1 0 5 04 7 - 1 2 MA I N CHASS I S 5 04 7 -0 4 Pa rts N o . D es c r i pt ion P l l O ( T9 20 1 67 0 Sy m b o l N o .
  • Page 24 6 8 00 µ F C207 K40 1 2 9 0 0 5 Electro lytic 1 6WV T RA N SI ST O R K4 0 1 4 0 1 0 8 2 5WV l OOOµF 2 SA7 3 3 C203 Q 3 0 1 G 3 1 0 7 3 3 0...
  • Page 25 C 3 44 , 3 5 1 K7 0 1 27 22 6 Tan talum 1 6WV 22µF SW I T C H K 7 0 1 4 7 1 0 5 25 WV C 3 3 3 , 3 4 8 l µF S 5 0 5 N 3 0 9 0 0 0 2...
  • Page 26 D I O D E CA PA C I T O R 1 80pF 0 60 1 -6 1 0 G 2 0 1 5 5 5 0 Silicon 1 S 1 5 5 5 C604 , 6 0 5 K 1 0 1 7 9 0 0 6 Ceramic 5 0WV...
  • Page 27 P7 0 1 (wit h wire) T9 2023 20A 5 04 7 -04 P7 0 2 P 1 0 900 7 2 5 0 4 7 -0 5 Q6000025 T E R M I N A L B OA R D 1 L3 P ( 1 -0 -2 ) ( 2 -0 -1 ) K E Y I N G U N I T S y m b o l N o .
  • Page 28 D O / I C I O Q:: � J C 3 1 , 36 M C l40 �0Bx 2 Tl(C Rl?C TRO VBB Voo Vee SBS sro �!:: 3. 12 JB IC 2D WLS2 TRI TR2 TR3 rR4 TRS RRI RR2 RR.3 Rll4 Rk.S GNO THRFTJIRL DR Df/R MR C/?LRllD W4SI 31 .J2 3 24...
  • Page 29 - F /-=- l mH x 2 r -:E� ;- - :R � :i9oo W I DE R EV . - : - - � 0 -;;- A U T . c N o. - Ps 5 k ( B ) VRO I P H O N E S F ADJ...
  • Page 30 I C 42 I C 3 3 I C 3 3 I C 48 IC44 B 1 C 1 0 1 11 z oz C z D 2 Z, :4 L ' Lo I C 2 6 t-5 V ,I I C l 5 ICl 4 �...
  • Page 32 YA E SU 8 0 0 2 - 1...

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