• TwitterFacebookGoogle PlusLinkedInRSS FeedEmail
  • Monday, June 11, 2012

    Today's Vintage: Collins KWM-2A

    Even if you are a newcomer to ham radio, you probably have already heard of the KWM-2A! A classy TRX of all time.

    Introduction Date / Price:
    KWM-2 -- 1959 / $1150 KWM-2A -- 1961 / $1250; (Price $3533.00 in 1977)


    Tube List: 6AU6 / 7543  (1) 6AZ8  (3) 6BN8  (3) 6CL6  (1) 6DC6  (1) 6EB8  (1) 6U8A  (4) 12AT7 (2) 6146  (2) Description: 

    The KWM-2/2A was unmatched in performance and dependability for mobile and fixed station applications. The transceiver's power input is 175 watts PEP on SSB or 160 watts on CW. It transmits voice or modified break-in CW. The KWM-2A utilizes an additional crystal board allowing the operator to switch-select up to 14 optional crystals which can be outside the amateur bands. Frequencies near range edges may require trimmer adjustment for proper operation. The KWM-2A can be used for RTTY when a 516F- 2 Power Supply and external cooling air are employed.


    The transceiver is finished in light gray enamel with a simulated leather front panel to match the S/Line and its accessories. Compactness and efficiency of the KWM-2A are achieved through Collins' advanced design in which all tuned circuits and several tubes function in the dual role of transmitting and receiving. The same oscillators, Mechanical Filter, and RF amplifier serve both the transmitter and receiver. CW break-in and sidetone monitoring circuits are built in.

    Easily accessible controls on the front panel of the KWM-2A include the OFF-ON-NB-CAL Switch, EXCITER TUNING, ZERO SET, PA TUNING, LOADING, MIC GAIN, BAND Switch, AF GAIN, RF GAIN, EMISSION, and METER Switch. 


    Specifications: 
    FREQUENCY RANGE:
    Any 200 kHz range from 3.4 to 30 MHz (except 5.0 to 6.5 MHz) using the appropriate crystal.
    The following crystals are supplied:
    80 meters: 3.4 - 3.6 MHz, 3.6 - 3.8 MHz, and 3.8 - 4.0 MHz.
    40 meters: 7.0 - 7.2 MHz and 7.2 - 7.4 MHz.
    20 meters: 14.0 - 14.2 MHz and 14.2 - 14.4 MHz.
    WWV (Calibration): 14.8 - 15.0 MHz.
    15 meters: 21.0 - 21.2 MHz, 21.2 - 21.4 MHz, and 21.4 - 21.6 MHz.
    10 meters: 28.5 - 28.7 MHz.

    FREQUENCY CONTROL:
    70K-2 Permeability Tuned Oscillator (PTO)

    MODES:
    SSB (selectable sidebands), CW, or RTTY with 516F-2 power supply and external cooling air.

    TYPE OF SERVICE:
    SSB continuous; CW 50% duty cycle.

    POWER REQUIREMENTS:
    Power can be delivered by an external supply such as the 516F-2, PM-2, MP-1, or 516E-2 which must furnish 800 vdc at 230 ma; 285 v dc at 210 ma; 6.3 v at 11 amps, and from -55 to -80 vdc with no current requirement. Heater supply may also be 12.6 v at 5.5 amps or 24 v at 2.75 amps. Reduced final plate voltage and current typical of mobile installations will reduce power output specifications. With the 516F-2, power consumption is approximately 190 watts in receive, 430 watts in lock-key, and 290 watts normal voice transmit.

    PLATE INPUT POWER:
    175 watts PEP on SSB; 160 watts on CW.

    OUTPUT POWER (50 ohm load):
    100 watts PEP (3.4-15 MHz); 90 watts PEP (15-25 MHz); 80 watts PEP (25-30 MHz).

    HARMONIC AND OTHER SPURIOUS RADIATION:
    Carrier suppression -50 db; unwanted sideband -50 db; oscillator feed-through and/or mixer products -50 db except -40 db at 3500 kHz. Second harmonic -40 db. Third order distortion -30 db.

    NOISE LEVEL:
    40 db below single tone carrier.

    CALIBRATOR:
    100 kHz crystal oscillator.

    FREQUENCY STABILITY:
    Within 100 Hz during any one-hour period following 20 minute warm-up. Not more than 100 Hz with 10% line voltage variation.

    CALIBRATION ACCURACY:
    I kHz after midband calibration.

    BACKLASH:
    Not more than 50 Hz.

    VISUAL DIAL ACCURACY:
    200 Hz on all bands.

    OUTPUT IMPEDANCE:
    Variable, 50 ohms nominal, Pi-network capable of matching up to 2:1 VSWR.

    KEYING CHARACTERISTICS:
    Keying is free of chirps and clicks. Break-in CW and side tone provided.

    AUDIO INPUT:
    High impedance microphone or 312B-4,-5 phone patch.

    AUDIO FREQUENCY RESPONSE:
    300 - 2400 Hz nominal, determined by Mechanical Filter.

    AUDIO COMPRESSION CHARACTERISTICS:
    ALC operates on IF and RF amplifier stages and is capable of 10 db compression.

    RF FEEDBACK:
    Approximately 10 db of RF feedback around PA and driver for improved linearity.

    RECEIVER SENSITIVITY:
    0.5 uv for 10 db signal-plus-noise-to-noise ratio in amateur bands.

    RECEIVER SELECTIVITY:
    2.1 kHz nominal bandwidth at 6 db down; 4.2 kHz bandwidth at 60 db down as determined by Mechanical Filter.

    RECEIVER SPURIOUS RESPONSE:
    Image rejection better than 40 db. Internal spurious below I uv equivalent antenna input.

    RECEIVER OUTPUT LEVEL:
    1.0 watt maximum.

    AUTOMATIC GAIN CONTROL:
    The audio output level does not change more than 20 db as the input signal is changed from 10 uv to I v. Fast attack and slow release provide excellent AVC action on voice and CW.

    VIBRATIONS:
    2 g at 10-33 Hz.

    AMBIENT TEMPERATURE:
    O'- 50' C.

    AMBIENT HUMIDITY:
    0% - 90%.

    ALTITUDE:
    0-10,000 ft.

    PROTECTIVE DEVICES:
    PA cage is interlocked.

    SIZE:
    With feet - 14 3/4" W, 7 3/4" H, 14" D (37.47 cm W, 19.69 cm H, 35.56 cm D).

    WEIGHT:
    18 lbs., 3 oz. (8.25 kg).



    List of Featured Videos.
    1. Collins KWM-2A Round Emblem Vintage HF SSB ham transceiver

      This is the Collins KWM-2A - Arthur Collins' masterpiece. This is probably the most well-known ham radio ever made. The first ones were sold in ...
      de LifeIsTooShortForQRP  hace 9 meses  Visto 3851 veces
    2. Collins KWM-2A VE3NGW with Tom DF2BO Optibeam

      Just finished recapping and alignmenti on my new to me 1963 beautiful KWM-2A and 516F-2 PS First contact was with Tom in Germany from the Optibeam ...

      de ve3ngw  hace 1 año  Visto 4623 veces
    3. Collins KWM-2 Restoration operational video

      www.masseyradiolabs.com. This is the restoration project operational video for one of our Collins KWM-2 transceivers. The transceiver is one of my ...
      de masseyradiolabs  hace 1 año  Visto 4556 veces
    4. Collins KWM-2A Transceiver with Dial Lock

      Overall view and demonstration
      de noirfilmradio  hace 2 años  Visto 6285 veces

    5. Collins KWM-2

      receiving on 80 mt with this vintage (1963) classic tranceiver
      de iz2flx  hace 3 años  Visto 10403 veces

    6. Collins KWM-2A A Mistery of Time HF Transceiver

      Military Radio Used In Vietnam War Do you realize that this voice will transmitted again 50 year later?
      de AgusWinarnoMr  hace 6 meses  Visto 538 veces
    7. Collins KWM-2A Vintage Tranceiver on Maritime net 14.300 mhz

      Collins KWM-2A on the 20 Meter Maritime Net 14.300 Mhz.
      de toysita1  hace 2 meses  Visto 235 veces
    8. CT1BRM Collins KWM-2

      Collins não precisa de apresentações !
      de ct1brm  hace 4 años  Visto 17221 veces

    9. Collins KWM-2A M0XFX

      de M0XFXUK  hace 1 año  Visto 687 veces


    10. Collins KWM-2 Example Audio

      Example Audio from Collins KWM-2 RE Transceiver
      de av8or19  hace 6 meses  Visto 548 veces


    11. Collins KWM-2A 14.263 MHZ Collins Net

      Listening to the Collins net on 20 Meters .. Sunday @ 18:00 UTC On a KWM-2A Mic is Shure 51-S
      de toysita1  hace 2 meses  Visto 116 veces


    12. Collins KWM-2 M0XFX

      de M0XFXUK  hace 1 año  Visto 915 veces


    13. AM mode in a Collins KWM-2 station

      Funzionamento del Collins KWM-2 in AM groups.google.it '73 Marco
      de IZ0MFI  hace 2 años  Visto 6338 veces


    14. Collins KWM-2A Transceiver

      Listening to East coast working Japan 15 Meters

      de toysita1  hace 1 día  Visto 5 veces


    15. Collins KWM-2 30L-1

      Dimostrazione di una stazione amatoriale allo stato termoionico
      de iz2flx  hace 3 años  Visto 5502 veces


    16. Collins KWM-2A In QSO with VE7RQ Jan 09'

      In QSO with VE7RQ on a Collins KWM-2A
      de toysita1  hace 2 meses  Visto 55 veces


    17. COLLINS KWM-2

      de wowwow599  hace 1 año  Visto 844 veces


    18. PY2SRA teste do collins kwm2a na casa do radioamador de amparo.mp4

      Teste da recepcao maravilhosa de um COLLINS KWM2A, na casa do radioamador de AMPARO PY2SRA e uma vista dos radios do meu amigo Pires PY2PJN...........
      de Pu2rog  hace 3 meses  Visto 201 veces

    19. Collins 312B-5 Station Console

      View and demo
      de noirfilmradio  hace 3 años  Visto 3315 veces



    20. KWM-2A

      수신
      de TheMrkeun  hace 2 años  Visto 1514 veces



    -->