single-813 crystal oscillator transmitter

Posted on Feb 7, 2014

Here is the single- 813 crystal oscillator transmitter, designed by RCA and exhibited in their advertisement on the back page of a `QST` magazine in 1938, and published by RCA in their HamTips bulletin, vol. 1, no. 4, dated December 1938. This transmitter`s output is 150 watts of CW or 100 watts of plate-modulated AM telephony. It seems obvious

Click here to download the full size of the above Circuit.

that this circuit and the 5 meter push-pull 807 oscillator transmitter were both designed by the same RCA team. The same caution about screen voltage applies here as well. In my opinion, the keying circuit leaves something to be desired. Perhaps cathode or grid-block keying should be tried. They would certainly be safer. Click here to view and/or print page 1 of the scanned copy of the RCA HamTips referenced above, which discusses this transmitter and its features, and click here for page 2. And here are some photos of one of these built by Jack Meadows, W7QQQ, of Arizona. I have often heard this rig on the air on one or the other of the BA frequencies, 3547. 5 Khz. , and/or 7050 Khz, and have worked him when he was using it. It sounds very nice.

Visit page

Leave Comment

characters left:

Related Circuits

Arduino How to control a Servo

In this one, servo is programmed to be controlled by two buttons, one turns servo to the left and the other one turns it to the right. When the servo is turning, corresponding LED will be switched...

Arduino Power

Having your Arduino control higher-power devices like lights, motors, pumps, doors, and many more is one of the most interesting and useful applications you may get involved with. But it can be a...

Motor Drivers

Arduino can drive many kinds of motors. But the low-power signals from Arduino need to control high-power circuits to run the actual motors. Here we will give examples of ways that Arduino can...

Your Duino Starter

This manual will show you how to use each of the components in the kit, and give you software Sketch examples for each one. Then you can combine some components to make examples of Automatic...

Arduino Project RomG

Arduino GSM Shield

The Arduino GSM Shield connects your Arduino to the internet using the GPRS wireless network. Just plug this module onto your Arduino board, plug in a SIM card from an operator offering GPRS...

Arduino Stepper Unipolar Circuit

The text of the Arduino reference is licensed under a Creative Commons Attribution-ShareAlike 3. 0 License. Code samples in the reference are released into the public domain.

Arduino Analog Input

A potentiometer is a simple knob that provides a variable resistance, which you can read into the Arduino board as an analog value. In this example, you`ll connect a poterntiometer to one of the...

New Circuits

Zero consumption Anti-theft High power Code Switch for E-Bike Batteries

This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
Ultrasonic distance finder circuit

The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Simple Metal detector circuit with CD4030

Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Fully automatic watering circuit for flower pots

Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
Simple deep searching metal detector circuit

The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
Sub-Harmonic Bass Converter for Electric Guitars

The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
Echo Depth Sounding Sonar for Boats

In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
100W HiFi Audio Amplifier Circuit

This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
Plant-Pot Water Level Indicator Circuit

A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....