Twin Triode Mixer Circuit For Ssb Frequency Conversion

6as6 Preamplifier Schematic

Push-pull circuits and the tubes into exact amplitude and phase balance, about 20 db of injection frequency cancellation is all that can be depended upon. With suitable trimming adjustments the cancellation can be made as high as 40 db, however, in fixed frequency circuits. The Twin Triode Mixer The mixer circuit shown in figure 28 has about 10 db lower distortion than the conventional 6BE6 converter tube. It has a lower voltage gain of about unity and a lower output impedance which loads the...

Simple Watt Phasing Type Ssb Exciter

Diy Ssb Circuit Diagram

Pole double-throw switch in the output circuit of the cathode follower permits sideband selection. A Filter-Type Exciter for 80 and 40 Meters A simple SSB filter-type exciter employing the Collins mechanical filter illustrates many of the basic principles of sideband generation. Such an exciter is shown in figure 39. The exciter is designed for operation in the 80 or 40 meter phone bands and delivers sufficient output to drive a class ABi tetrode such as the 2E26, 807, or 6146. A conversion...

Class B Plate Modulation

Making The Modulation Transformer

This type of modulation Is the most flexible in that the loading adjustment can be made In a short period of time and without elaborate test equipment after o change In operating frequency of the Class C amplifier has been made. power output capability of one-half the input to the Class C stage. If the modulator is a Class B audio amplifier, the average power required of it may vary from one-quarter to more than one-half the Class C input depending upon the waveform. However, the peak power...

The Endfed Hertz Antenna

Showing the manner in which an end-fed Hertz antenna may be fed through a low-impedance line and low-pass filter by using a resonant tank circuit as at A , or through the use of a reverse-connected pi network as at B . Some harmonic-attenuating provision in addition to the usual low-pass TVI filter must be included in the coupling system, as an end-fed antenna itself offers no discrimination against harmonics, either odd or even. The end-fed Hertz antenna has rather high losses unless at least...

The Fremodyne Superregenerative Superheterodyne Detector For Frequency Modulated Signals

Superregenerative receivers radiate a strong, broad, and rough signal. For this reason, it is necessary in most applications to employ a radio frequency amplifier stage ahead of the detector, with thorough shielding throughout the receiver. The Fremodyne The H a z e 11 i n e - Fremodyne Detector superregenerative circuit is expressly designed for reception of FM signals. This versatile circuit combines the action of the superregenerative receiver with the superhetrodyne, converting FM signals...

G3sek 4cx1000 Grounded Grid Amplifier

4cx1000a Amplifier Schematic

5 turns, 1 4 copper tubing, 2 7 4 o.o., 3 long. capacitor G and G, the grid circuit bypass capacitor. Screen voltage may be removed for tune-up purposes by control switch Sa, section B. The screen circuit is grounded in the off and fil positions by means of switch section C. Amplifier The complete amplifier is Construction built upon an aluminum chassis measuring 13 x 17 x 3 and has a 14 standard relay rack panel. The Figure 40 GRID TANK CIRCUIT ASSEMBLY Coils are mounted to the ceramic switch...

Schematic Of Amateur Band Receiver

Tube Comunication Receiver Schematic

The front-end circuit is shown in Figure 18A. The tuning capacitors placed across the input and output circuits of the mechanical filters are determined by the choice of filter. See filter specification sheet. Type F455C filters were used in this receiver. M 0-1 d-c milliammeter, 1-inch diameter SiA-B DPDT rotary switch. Centralab PA-2001 decks, with Centralab PA-302 index assembly SiA-B-C-D 4 pole, 3 position switch. Centralab PA-1013 T 1500 kc. i-f transformer. J. W. Miller Co. 5I2-W1. Remove...

Block Diagram Of Deluxe Amateur Communication Receiver

6ba6 Revceiver

Employs a 6BQ7A cascode r-f amplifier and a 6J6 mixer-oscillator. All r-f tuned circuits are changed as the tuner is switched from channel to channel. The intermediate frequency output of the tuner is 1695 kc. A 6BA7 pentagrid mixer tube converts the first intermediate frequency to the second i-f channel, which is 455 kc. To obtain a high order of stability, the 6BA7 conversion oscillator is crystal controlled at 2150 kc. Switch Si in the output circuit of the 6BA7 mixer stage permits the...

Dome Audiophaseshift Network

Degrees Phase Shifter

This circuit arrangement is convenient for obtaining the audio phase shift when it is desired to use a minimum of circuit components and tube elements. variable and should have a lower value of inductance than that value of inductance which would have the same reactance as resistor R. Inductor L may be considered as being made up of two values of inductance in parallel a a value of inductance which will resonate at the operating frequency with the circuit and tube capacitances, and b the value...

The Double Skeleton Cone Antenna

A skeleton cone has been substituted for the single element radiator of figure 2C. This greatly increases the bandwidth. If of least 10 elements are used for each skeleton cone and the angle of revolution and element length are optimized, a low SWR can be obtained over a frequency range of at least two octaves. To obtain this order of bandwidth, the element length L should be approximately 0.2 wavelength at the lower frequency end of the band, and the angle of revolution optimized for the...