Possible malfunctions of the detector receiver. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Possible malfunctions of the detector receiver. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur

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The detector receiver is the simplest radio engineering device. However, in it, as in a complex receiver, there may be problems that you need to be able to find and fix. The least malfunctions occur, as a rule, in the receiver, the parts of which are firmly fixed, the installation is done carefully, and all connections are securely soldered.

But if, nevertheless, the receiver stops working or works intermittently, then somewhere there is an open, unreliable or very bad contact, a short circuit has occurred. First of all, it is necessary to see if there are any external damages in the coil, if the antenna and ground are well connected, if the switch is in order. Check the serviceability of the antenna and grounding and their inputs, see if the antenna wire is in contact with any object through which there may be leakage of current from the antenna to the ground in addition to the receiver. "If no external damage is found in the receiver, antenna and ground, then where "the contact in the receiver itself is broken. Most often, bad contacts appear in the switches due to loosening nuts and screws during setup, poor stripping of the mounting wire at the joints. In this case, the receiver stops working altogether or transmissions are received with a significant crack. Check all these parts and connections, tighten the nuts, adjust the switch slider.

The fault may also be in the coil if it is not wound from a whole piece of wire and the junctions are not soldered. Such cases are most common if the receiver is in a damp place: dampness oxidizes connections, and electrical contacts are broken.

What else could be wrong with the receiver?

Look at the diagram of your receiver and answer these questions. Will the receiver work if the blocking capacitor is "broken" (its plates are connected)? What happens if the wires of the headphone cord are connected? Will the receiver work if the beginning and end of the loop coil are accidentally connected or its taps are broken?

Ask yourself a series of similar questions and answer them. Then it will be easier for you to find faults in the receiver and fix them.

In the future, you will learn about probes and devices that make it easier to assess the quality of parts, contacts, connections. They can also be used to troubleshoot the detector receiver.

Publication: N. Bolshakov, rf.atnn.ru

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