Zenith Trans. Oceanic Radio Theory of Operation. Zenith. Trans- Oceanic Theory of Operation. The following chapters. Department of the Army Technical Manual TM1. R- 5. 20/URR. Radio Receiver published January 1. It is presented here because it. Zenith. Trans- Oceanic Radios.

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It was scanned and the text converted using OCR. Every. effort was made to correct the inevitable mistakes. The text may refer to some. Chapter 4 and 5. However, figure 4. Chapter 4. The figures have high resolution, but. A valuable resource for.

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TM1. 1- 8. 77. CHAPTER 4. THEORY4. 2. 1. 5)Radio Receiver R- 5. URR. is a portable superheterodyne receiver designed to receive am signals in the.

The frequency ranges are given in paragraph 4. The tuning system. U4 tube, and a 1. L6. pentagrid converter which operates as a combination mixer and h- f.

A different mode of tuning and tracking is used on. The block diagram, which shows the. First R- F amplifier. The r- f amplifier.

V2 and the antenna, and also stops unwanted signals. The signal from. the r- f amplifier is fed to the mixer section of combination mixer and. V2. The oscillator section of tube V2 produces an h- f. This voltage is combined with the received signal in the mixer.

V2 to produce a difference beat frequency of 4. V. 3. c. I- F Amplifier.

The i- f amplifier is a high- gain. Most of the signal.

Detector and First. A- F Amplifier. The amplified signal from the i- f amplifier is fed to detector tube V4.

V4 is a dual tube, which serves as a detector and a first a- f. The detector stage also produces the avc. V1, V2, and V3. e. Final Audio Power.

V4 is fed to audio- output stage V5 for power amplification. The components required to tune the receiver through a. Where practicable, switching is simplified by shunting the.

Most of the. unused coils are shorted to prevent any undesirable resonant effects. The. tuning methods used for the three different types of bands are described in a. Additional details on the receiver tuned circuits are. The tuning range of the broadcast. Tuning is provided by means of ganged tuning. C2, sections A, C, and E.

Figure 1. 6 shows the r- f and converter. BC pushbutton Sl. A is pressed. The switch. The tuning ranges of the two.

Both continuous coverage bands have similar antenna. Figure 1. 7, which is used to facilitate discussion. S1. B pressed). Figure 3. S1. B. drawn in line. The tuning ranges of the.

M), 1. 1. 6 to 1. M), 1. 4. 9 to. 1. M), and 1. 7. 5 to 1.

M). Tuning is provided by means of the. All four spread bands. Figure 1. 8, which is used to.

M. operation (pushbutton S1. D pressed). Figure 3. S1. D drawn in line. The tuned antenna. Can You Hack School Computer on this page.

E2, antenna loading coil T4, and ganged tuning. C2. A. The high r- f end of the loop antenna (junction of J1 and L4) is. U4 r- f tube through capacitor C3. U4 r- f tube for avc action. Antenna loading coil L4. R- f coupling from the lower end of.

E2 to the filament of the r- f amplifier is provided by capacitor. C3. Similarly, r- f coupling from the lower end of tuning capacitor C2. A to the. filament of the r- f amplifier is provided by capacitor C1. Capacitor C3. resistor R1, and capacitor Cl. Trimmer capacitor.

C2. B is mounted on top of ganged tuning capacitor C2. A and is set to track at the.

Capacitor C1 isolates the power line from a. Plate voltage for the. B+ bus through primary winding CD of coil. L1 and damping resistor R3. Screen voltage for the r- f stage is supplied. B+ bus. Primary winding CD of coil L1, in series with R3.

V1. Secondary winding AB of coil L1 is tuned by ganged. C2. C. The filament of V1 is returned to B- for r- f through capacitor.

C9. Avc voltage to control the gain of the r- f stage is supplied through. R2. Trimmer capacitor C2. D, mounted on top of ganged tuning. C2. C, is set to track at the h- f end of the broadcast band.

The. filament circuit is discussed in paragraph 5. The plate and screen voltage. The avc voltage distribution.

The combined functions. V2, which. uses a type 1. L6 tube. The filament and first two grids act as a triode to. Grid 1 (pin 4) functions as the oscillator. The mixer section. Plate voltage for the oscillator section is supplied from the.

B+ bus through primary winding EF of coil L2. Screen voltage also is supplied. B+ bus, but through dropping resistor R7. The screen is bypassed. C1. 1. Grid leak bias is provided by the combination of C1.

R6. Avc voltage to control the gain of the converter stage is supplied. R2. 6 (par. The filament is returned to B- for. C9. Paragraph 5. 9 contains a discussion of the filament.

The oscillator is the tuned- grid. Section EF of coil L2 is. DB is the tuned- grid winding. Temperature compensating capacitor Cl. C2. F are both in parallel with ganged tuning capacitor. C2. E. Trimmer capacitor C2.

F is mounted on top of capacitor C2. E and is set to. calibrate the oscillator at the h- f end of the broadcast band. Coupling from. winding DB of coil L2 to the oscillator grid is provided by capacitor C1.

To prevent. undesirable resonance effects, winding GH of coil L2 is shunted by capacitor. C4. 2 through a section of switch Sl. A, and winding AC is shunted by.

C3. 8 and C1. 4, in series, through another section of switch S1. A. b. The signal from the r- f amplifier. C7 to the mixer grid (pin 6). A portion of. the r- f amplifier output also is applied through capacitor C8 to the oscillator. Pulling in a pentagrid converter, such as the 1.

L6, is the. tendency of the oscillator frequency to shift toward the applied signal. Mixing action between the oscillator and r- f signals occurs within. The difference frequency (i- f) is. T1. 4. 7. 1. 7)The two continuous.

The antenna, r- f, and converter. C2. Both tuning ranges have similar. Antenna Stage (4- to 8- me).

The. telescopic whip antenna is coupled to antenna coil L5 through capacitor C2. L5 through capacitor. C2. 8 The antenna circuit consists of coil L5 shunted by tuning capacitor C2. A and. trimmer C2. B. Coupling to the control grid of the 1. U4 r- f tube V1 is provided by.

C3. 0. Coil L5 is set to track at the i- f (low- frequency) end of the. Trimmer capacitor C3. A in series with parasitic suppressor R2. Capacitor C1 isolates the. R- F Stage (4- to. The r- f stage is coupled inductively to the converter stage by. L1 and is coupled capacitively by capacitor C6.

R- f coil L1. 2 is. L1 through a section. S1. B and capacitors C3. C1. 0. Tuning is provided by. C2. C. Coil L1. 2 is set to track at the l- f end of the.

C3. 5A is set to track at the h- f end of the. The filament circuit is discussed in paragraph 5.

Converter Stage (4- to 8- me). When. the 4- 8 mc continuous coverage band is selected by section S1. B of the band. selector switch, oscillator coil winding L1.

A is shunted effectively across the. EF through series capacitors C3. C3. 9. To prevent.

GH of coil L2 is shunted by. Coil L3 is a. high- impedance loading coil that improves the operation of the h- f oscillator. Oscillator plate voltage is supplied through winding EF of coil.

L2. Screen voltage is supplied through dropping resistor R7. The screen is. bypassed for r- f by capacitor C1. The filament circuit is discussed in. Tuning is provided by ganged tuning capacitor C2. E. The core of. coil L1. A, Ll. 8B is set to calibrate at the 1- f end of the 4- 8 mc band.

Trimmer. capacitor C4. A is set to calibrate at the h- f end of the band. The signal from. the r f amplifier is coupled to the mixer grid (pin 6) through capacitor C6 and. L1 and capacitor C7.

A portion of the r- f amplifier is. C8 to the oscillator plate (pin 3) which effectively. The oscillator. frequency is 4. The oscillator. and r- f signals are mixed within the electron stream of the converter. The. difference frequency (i- f) is taken from the plate (pin 2) and applied to the i- f. T1. 4. 8. 1. 8)The four spread bands. M (9. 4 to 9. 8 mc), 2.

M (1. 1. 6 to 1. 2 mc), 1. M (1. 4. 9 to. 1. M (1. 7. 5 to 1. 8.