Yaesu FT-901DM Instruction Manual
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Yaesu FT-901DM Instruction Manual

Yaesu FT-901DM Instruction Manual

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Summary of Contents for Yaesu FT-901DM

  • Page 2 TABLE CONTENTS (Page) GENERAL SPECIFICATI ONS CONTROLS AND SWITCHES ... REAR AP RON CONNECTION S ....... . . 8 INSTALLATION .

  • Page 4: Specifications

    SPECIFICATIONS TRANSMITTER GENERAL Frequency coverage: Emission: 1 6 0m LSB, USB (A3j ), CW (A 1 ), AM (A3h ), FM 1 . 8 - 2 . 0 MHz ( F 3 ) (option FT-9 0 1S D/ D E ) , F S K (Fl ) 8 0m 3 .

  • Page 5: R F Speech Proce S Sor

    Passband tuning: RECEIVER Continuou s from 2 . 4 kHz to 3 00 Hz Sensitivity: S S B/CW/FSK 0. 2 5 µV for S/N 0 d B In t er modulation: µV for S/N 1 0 d B B e tter than 80 d B immunity at 20 kHz offset 0.3 µV for 20 d B quie ting 2 0 dB inpu ts at 14 MHz Image rejection:...

  • Page 6: Tube Complement

    TUBE COMPLEMENT FET: M S M 5 5 0 1 Varactor diodes: 2 S K 1 9GR M S M 5 5 6 2 1 S 2 2 0 9 2 S K 1 9 B L 1 2BY7A M SM 5 5 6 4 1 S 2 2 3 6 2 S K3 4E SN7 5 4 5 0B...

  • Page 7: Controls And Switches

    CONTROL S AND SWITCHES be certain that y o u understand the function o f This transce iver has been specifically designed for every control before operating the transceiver. ease of operatio n an d versatility . The operator The various fron t p an el c ontrols and switches m ay , however, be unfamiliar with the operation are described in the following section .
  • Page 8 ( 1 5 ) PLATE (8) PRES ELECT This control p retunes the signal circuits for b oth This con trol tun es the plate circuit o f the final trammit and receive. The PRESELECT circui t amplifier. p rovides continuous permeability tuning through­...
  • Page 9 (24) PHONES m inimum input l evel from the microphone to trigger the microphone amplifier. Low-level back­ This is a standard 1 /4 " phone j ack for accom­ ground n oise will not activate the transmitter m o d ation o f headphones. The internal sp e aker is with the AMGC in operation .
  • Page 10 REAR APRON CONNECTIONS @®® <JJ ® ® ® ( 9 ) FUSE Fuse holder requires 5 amp fuse for 1 1 7 volt or Thre aded lug for ground c onnection. amp fuse for 220 volt op eration . F or 1 2 volt DC operation, a 2 0 amp fuse is installed in the RF OUT p ower cable.
  • Page 11 the internal speaker will be disabled when plug is inserted . ( 1 6) PTT This j ack may b e used for external actuation o f t h e transmitter. As an example, a fo otswitch m ay be connected to this j ack to provide rem ote con­ P I N N o H[ Alf P trol of the transmitter relay , leaving the operator's...
  • Page 12 INTERCONNECTIONS FT-901 FL-2100F � PIN2 PIN I PIN6 ((II) ) FV-901DM EXTERNAL RECEIVER � HF ANTENNA HF ANT � FT-901 430MHz ANTENNA ===t[B=> A A T RF IN CABLE C CABLE A -10-...

  • Page 13: Base Station Installation

    We do n ot recommend the use of power con­ fu se . When making conn ections to the car b attery , nectors other than the ones supplied b y Yaesu . If b e absolutely certain that the RED lead i s c on­...

  • Page 14: Antenna Considerations

    The BLACK lead shoul d , preferably , run directly ANTENNA CONSIDERATIONS to the negative terminal of the battery . Using the The FT-9 0 1 transceivers are d esigned fo r operation car frame as a n egative connection or connecting using an antenna system presenting a 50-7 5 ohm the RED lead t o a p ositive point such as the ig­...

  • Page 15: Initial Check

    OPERAT ION Turn the POWER switch to ON . The me ter The tuning procedure for this transceiver is not will light up and the operating frequency complicated. However, care should be exercised will be displayed on the dial window. Adjust when tuni n g so that peak performance of the equipment is secured .
  • Page 16 LOADING POSITIONS improvement in sign al-to-noise rati o . selec tivity of the APF circui t may be varied BAND POSITION by adjusting VR501 under the top cover. 1 6 0 For ex tremely strong sign als, the ATT (RF attenuator) switch may be pressed to activate 3 .

  • Page 17: Final Tuning

    ( 4 ) Rotate the PLATE con trol for a minimum SSB OPERATION meter reading ("dip" final amplifier cathod e curren t ) . A fter completion of the above tuning procedure , ( 5 ) Push the TUNE button again to re turn the set the MODE switch to U S B or LSB as desire d .

  • Page 18: Fsk Operation

    For straight key , bug, or external electronic key e r The distortion produced by RF envelope clipping use, rotate t h e K E Y E R control fully c oun ter­ and filtering is less objectionable than that caused clockwise into the click-stop.
  • Page 19 on the rear panel. The FT-9 0 1 D M is se t up for Turn the ribbed calibration ring on the main 1 7 0 Hz shift , and the shift frequency may be ad­ tuning knob shaft to calib rate the analog justed some what by means of the trimmer capaci­...
  • Page 20 Operation of the memory system is perhaps best Split-frequency control may be ob tain e d with the describ ed b y the use o f some e xample s : memory sy stem or the FV-9 0 1 syn the sized scan­ ning VFO.
  • Page 21 US B ( TX RX ) CW( R X ) B9B9 k H z SBI TX RX) FSKIRX) B9B6 k H z CW. A M . FSK I TX ) B9BB .3 k H z A G C I.­ A M P 0 1 0 1 S K40M NB CON T.

  • Page 22: Theory Of Operation

    THEORY OF OPERATION RF UNIT (PB-1 720) , This transceiver utilizes PLL (Phase Locked Loop ) circuitry. The receiver is a single-conversion type with a 8 . 9 8 7 5 M Hz IF. The following circuit des­ The incoming signal is amplified by the RF ampli­ DM , cription is tailored to the full-feature FT-9 0 1 fier Q 1 0 1...
  • Page 23 FILTER UNIT (PB- 1 7 1 6C) IF UNIT (PB- 1 704) The I F signal from pin 1 4 is fed to the gate o f the The IF sign al received at pin 2 of the FI LTER IF first mixer, Q 4 0 1 UNIT ( PB-1 7 1 6 )
  • Page 24 The output from the IF second mixer is fed The RF GAIN c on trol on the front panel varies the AGC v ol tage level, providing manual control through a m on ol i thic fil ter XF 402 to the two-s tage IF ampl i fier c on sisting of Q403 an d Q404 (b oth of the gain of the RF and IF stages.
  • Page 25 by 0 90 5 and 9 0 6 (both 1 S l 88FM) to prod uce a FM UNIT ( P B- 1 707 ) DC voltage . This voltage is applie d to turn "on" Q 907 (2SC 1 8 1 5Y). With Q 907 "on, "...
  • Page 26 CARRIER UNIT (PB- 1 706 ) The carrier oscillator Q702 (2SK 1 9GR ) is followed SY). b y a buffer amplifier Q 703 (2SC 1 8 1 It oscil­ lates at one of the following frequencies, depend­ ing on the m ode of operation : 8 9 8 9 kHz with X 7 0 2 ;...
  • Page 27 UNIT (PB- 1 70 5 ) The audio signal from the AM dete ctor is ampli­ fied by Os o 7 (2SC 1 000GR) and fed to the first audio amplifier O s o i ( 2 SC 1 000GR ) . On SSB , CW , FM , and F S K , the audio signal is directly fed to Os o i from pin 1 5 .
  • Page 28 NB UNIT (PB- 1 703) The drain of Q 2 2 is direc tly connected to the base o f Q 3 0 3 ( 2SC1 8 1 5Y ) in the F I LTER UN IT. A p ortion o f t h e 8 9 8 7 . 5 kHz IF signal is fed to As the drain v oltage o f Q2 2 drops, the base voltage o f Q 3 0 3 drops, turning o ff Q 3 0 3 .
  • Page 29 TRANSMIT CI RCUIT between the collector and emitter of Q2 0 7 ( 2SC 1 8 1 S Y ) , thus changing the input sign al level to the filter. The CW, F S K , AM , and F M signals pass through The ou tput from the MIC j ack 1 2 is fed through ( 2S K 1 9GR ) 0 2 0 1...
  • Page 30 Keyer speed is controlled by VR2 b on the fron t p anel. VR2 7 0 1 provide s adjustment of the dot­ sp ace symme try, while VR2 7 0 2 adjusts the keying In th e CW , AM , and FSK m o des, carrier oscillator weight.
  • Page 32 an active low pass filter to eliminate harm onics The VOX GAIN control V R 1 the fron t p ane l c aused by the clipping. V R 9 0 2 de termines the provides adju stment for re lay sensi tiv it y , m aximum deviation .

  • Page 33: Com Mon C I Rcuits

    XTA L UNIT (PB- 1 7 1 1 ) When 02 1 0 7 i s grounde d , 0 2 1 0 2 (2SA73 3 ) tu rn s ON , and the vol tage appeari ng at the collector o f Crys tal oscillator 0 1 3 0 1 - 0 1 3 1 0 (all 2SC 1 8 1 5Y ) 02 1 0 2 i s fe d th rough D 2 1 0 9...
  • Page 34 1 0 0 1 00 R50 100 1 1 wwv 1 5 M H z �r R48 100 15MHz 2 5 6 19 20 - 32 --...
  • Page 35 prior to being supplie d to a phase detector Q 1 1 0 7 p ortion of the Q 1 2 0 9 output is rectified by ( MC4044P) ; h ere the phase of the signal is com­ D 1 2 1 9 an d D 1 2 2 0 (b oth 1 N60) ;...
  • Page 37 from When the u n l ock signal 5 . 0 - 5 . 5 gen erated b y e c e P L L M H z sig n 02 8 0 1 ( JF I ( MC 1 40 1 1 B ) g 033B) U N IT , 0 2 9 1 6 e n e...

  • Page 38: Power Supply

    is amplified by 0 2 8 0 5 and 02 8 0 6 (both JF-1 03 3 B ) supplied t o the counter unit and accessory socket and 02 8 0 7 ( 2 SC372Y), and fed through a diod e on the re ar panel.
  • Page 39 PB- 1 7 1 2 RECT B U N I T Rl405 470K Cl502 1 0 0.u Rl403 Rl404 470K 470K L - - ­ CAPACITOR UN I T 13.5V(Q2, 3 l J4 ( 1 ) J4(8l - .., � t___J A C l l .
  • Page 40 AM/CW FILTER INSTALLATION Remove the top cover. Locate and remove (FILTER UNIT). Referring to Fig. locate 1 7 1 6 jump ers A and on the p rinted b oard. If the AM filter is to be installed , the j umper marked A must be installed , and for CW filter installation the jumper marked mu st b e removed.
  • Page 41 KEYER/MEMORY UNIT INSTALLATION Remove the small cover from the b ottom of the 65 30060 I Z G transceiver as shown in Fig. 1 . Install the MEMORY UNIT u sing the m ounting screws sup p lie d. Connect the 6-pin connector to the s ocket on the main chassis as shown.

  • Page 43: M Aintenance And Alig Nment

    RF p robe good to 40 MHz . (3 ) Dummy Load : Yaesu model YP- 1 5 0 o r equiv­ ale n t , with 5 0 Ohm non-reactive load imped­ ance rated to 1 5 0 watts average p ower.

  • Page 44: Cw Sidetone Level

    VOX ADJUSTMENT matched an tenna or dummy load . Turn the M I C GAIN control fully counterclockwise t o rem ove Tune in a signal and adjust the AF GAIN c on trol all audio input from the modulator stage . for a normal listening level .
  • Page 45 T C , 0 1 T C 7 0 2 T C 7o3 T C ' ° ' VR203 VR202 VR201 Q701 X703 x,02 Q70 9 J 7 0 1 Q107 ( PB - 1 7 06 ) C a r r i e r u n i t ( P B - 1 70 3 ) /P R O C unit...
  • Page 46 1 1 . KEYER ADJU STMENT V R2 7 0 2 con trols the d ot-to-sp ace ratio for the built-in electronic keyer ; this is normally set to 1 : 1 at the factory. VR2 7 0 1 adj u sts the symme try b e tween dots and d ashes.
  • Page 47 1 5 . POWER OUTPUT METER ADJUSTMENT ( 2 ) Locate TC0 1 , neutraliz ation variable capacitor shaft , on the inside wall o f the VR7 , located on the transceiver rear panel adja­ final amp lifier comp artment. cent to the RCV ANT j ack, provides adjustmen t for the relative power output indication on the Check the fin al amplifier idling current as...
  • Page 48 1 7 . ALIGNM ENT OF TRANSMITTER MIXE R / and TC 2 s o s for maximum PO indic atio n on DRIVER AN D RECEIVER FRONT the me ter. On receive, tune in the MARK E R STAGE signal, a n d adjust TC 2 4 o s for maximum S­...
  • Page 49 ADVICE ON TROUBLESHOOTING THE DRIVER/FINAL ST AGES Three tubes are used in the FT-90 1 DM : a 1 2B Y 7 A and t w o l 4 6 B 's , run in parallel i n the final . T 1 0 1 Q10s B e cause not all service personnel are as familiar...
  • Page 52 YA E SU 906 - D...
  • Page 53 (PIO/J2q02 ) COUNTER IZ- b ( M J 9 ) l' M !2��6- �330� _T�0_!.� � �Q�2_0�- DC-DC CONVERTER LNIT czo ti.()0 1 PRESELE C T P8-172b E X T !N t1ANUA L - -0 V S B � S K (' 0 N O T E S : ±10%...

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