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"DJB" wrote: Question to the group, Is it better to have a separate ground for you random wire short wave antenna (w/9:1 transformer) and a separate ground for your receiver (station ground) or can both use the same ground? If both were connected to the same ground, wouldn't that cause ground loop problems? Thank you in advance It prevents a ground loop problem to use isolated grounds. It will help reduce noise from the AC powering your radio from being part of the ³measurement³ in this case the signal of the station you are trying to receive at the input to the radio from also seeing noise on the AC power system. If your radio is plugged into the AC grid then it already has a virtual ground to it. What remains for you to do is to make a ground for the antenna circuit. The random wire is just half the antenna as the RF current it picks up needs a place to go to complete a circuit to ground. Creating a ground for the antenna that is isolated from the power ground through the ³transformer² will help reduce the noise floor on received signals. If you built a balanced or complete antenna like a dipole the antenna ground would not help much at all. The transformer would still help to isolate the antenna circuit from the virtual RF ground to the AC system reducing the noise floor. -- Telamon Ventura, California |
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