12/8/2023 0 Comments Audio overload![]() In the signal processing path, a stage is overdriven or misadjusted to createĮxcessive levels of distortion. Like IMD products, theįorm of IMD, splatter can be generated by an AM or SSB transmitter. The same cables and are radiated like any other signal. can get to unbypassed diodes or transistor Common-mode RF current on rotator cables, relay control wiring, power The diode can be outside (like corrosion) or inside your Generators-It only takes one strong signal to create harmonics in a ![]() Present, the interfering product goes away. IMD products are generated on specificĬombinations of the strong signal frequencies, and when both signals aren’t Metal-to-metal contacts and bad antenna or cable connections outside. (IMD)-Strong signals can mix together in any non-linear circuit orĭevice, including rectifiers accidentally created from corroded or rusty Common-mode signalsĬan be blocked by good shielding and ferrite RF chokes on the cables picking up Interfering with other signals that follow the normal path. (or any other piece of equipment), it will be amplified and processed, “breakthrough”-Your station’s cables act as antennas, picking up But what if the problem isn’t overload? Here are some issues ![]() Once you are sure the problem is overload, there are several In both AM receivers (which include SSB, CW, and FSK) and FM receivers. This isĪlso referred to as “de-sense,” short for “desensitization.” Overload can occur Or the receiver’s gain controlĬircuits are fooled into reducing gain until no signals can be heard. Subsequent stages, covering up desired signals. The result of overload can be distortion products that flood Have front-end analog circuits, receiver overload occurs when theĪnalog-to-digital converter’s range is exceeded. It is so strong that a circuit in the receiver is unable to processĪ mixer, an RF amplifier or a filter. Through the normal signal path from the antenna system into the receiverĬircuitry. The type of interference I’m writing about is a strong signal that travels Several types of interference are referred to as “overload.” Trying to operate from high spots with lots of transmitters, though, you’ll If you experience the interference while driving around, youĬan always move away from the source. Such as for police or fire dispatch stations. Interference can also be intermittent if the transmitter is turned on and off, Transmitter is on, and for broadcast stations, that is all the time. The interference will be present whenever the Your received signal strength meter will probably show aįull-scale reading, too. Is a continuous stream of distorted audio on all channels or across a wide Station, including commercial and public safety transmitters. It’s common to experience interference from a nearby broadcast
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