![]() Personally, I chose to orient cables and receivers to reduce the effects. #Audio overload help install#Of course, you have to install such a system. It may help to connect the transmitter's metal chassis to a proper earth ground system, entirely separate from the AC safety ground. Inductors in series with audio lines, re-routing cables, grounded high quality EMI filters to plug the transmitter and audio sources into. Eliminating rf signal pickup through audio cables and power supply cables is a start. Many of us have this problem and there are multiple things to try. The direct signal dwarfs whatever re-radiation is happening. I often note that the hum is nearly gone when a portable receiver is within a foot or two of the transmitter. By orienting the receiver, you can often find limited areas where the mains wiring version is much smaller, thus the hum is reduced. Your radio receives signals directly from the transmitter and hum-filled versions from house wiring. No matter how it gets onto the AC wiring, the signal is there modulated by the mains power and re-radiated. Some rf energy has a path to the AC wiring through your transmitter's power supply, and/or through the audio wirings back through your cassette deck into the mains wiring. Any wiring and/or electrical conduits behave as efficient antennas that intercept some energy from your transmitter and re-radiate it, just like your transmitter's antenna. If that is the case for you, then it is a sure sign the hum is not from the transmitter itself, or its power supply, but is instead a result of the transmitter signal interacting with your home's AC power wiring. Does the hum level change when you move your receiver around? A portable radio can be moved and oriented to "null out" the hum, or most of it. ![]() ![]() There can be multiple explanations that are difficult to diagnose from a distance. Regarding hum being received, that is a very different thing and probably why no one has answered your questions. Wire in a separate potentiomenter! That's probably what I would do as a quick fix. There is supposed to be an automatic level control to prevent overloading, but that is obviously not helping you. So, I don't have a clue how much level the input is able to handle before overloading. #Audio overload help manual#I don't have a Talking House transmitter and its user manual does not give audio input specifications. ![]() Kramden, your idea to control level from you cassette deck to the transmitter is sensible. ![]()
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