Tri-Tet Oscillator


Posted on Feb 5, 2014

QST`s most recent development ”the Tri-tet oscillator ”has made the single-tube crystal transmitter a really practical affair at last. Practical because it is now possible to work equally well in two ”and, in a pinch, in three ”amateur bands with a single crystal. Unless we miss our bet, this particular set marks the beginning of the era in wh


Tri-Tet Oscillator
Click here to download the full size of the above Circuit.

ich the new amateur`s first transmitter will be crystal controlled. ”from the deck of George Grammer, "A One-Tube Crystal-Controlled Transmitter, QST, March 1934, pages 8 12, 88 The tri-tet (triode-tetrode, also commonly spelled tritet) oscillator circuit (Figure 1) was announced in James Lamb, W1CEI, "A More Stable Crystal Oscillator of High Harmonic Output, " QST, June 1933, pages 30 32, as an improved means of generating radiofrequency (RF) power at harmonics (multiples) of the frequency of an oscillating piezoelectric frequency-control crystal. Misunderstood and misused, it went on to be reviled as a temperamental crystal destroyer. This page discusses the tri-tet`s genesis, characteristics, and adjustment, and shows how the tri-tet, properly used, is nonetheless an excellent means of achieving good keying and high power output in a one-stage radio transmitter. Figure 1 ”(A) The Lamb tri-tet oscillator as diagrammed for transmitting use in the June 1933 QST magazine article that introduced it. (B) The Lamb tri-tet redrawn with its screen-grid tube portrayed a bit more modernly, and ”to resistively load the crystal less, and to allow cathode-only keying (as opposed to B keying) by breaking the dc connection between the cathode tuned circuit and common ”with its grid-leak resistor decoupled by an RF choke and returned to common rather than to the tube cathode. The cathode tuned circuit, L1C1, is relatively high-C and is...




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Personal data logger for recording analog signal
    Quad op amp generates 4 waveforms
    Overvoltage protection circuit
    Delayed pulse generator
    Telephone-Operated Ac Power Switch
    The Link Telephone Intercom Every Home Should Have One!
    sensitive FM Transmitter
    555 IC PWM Motor Control with Current Limiter
    RMS Reading Voltmeter
    Sound Effects Generators
    Homebrew RF Test Equipment and Software
    push-pull 300B power amplifier
    SM7232, CS7232 dimming control ASIC circuit
    With NE555 make double touch light switch 2
    Comb electric circuit



    Top