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Frame - vs. Magnetic antenna ?
Hi
wonder if it is some particular difference between the terms "magnetic antenna" and "frame antenna" ? Somebody seems to have the opinion that the second is just a popular new word for the first, and it is no real difference. I would believe that a frame antenna could be a single winding antenna with high impedance connection on to the grid or gate of an amplifier or mixer, while the magnetic version has inductive coupling. I've tested some of the latter type on 136kHz and MF, and it seems that it is no need for an amplifier to improve the signal, it only lowers the signal to noise, and possibly put too strong signal into the receiver. On 136kHz the tuning is extremely sharp, and remote control is a must, see http://home.online.no/~la8ak/L2.htm , if a large frequency range should be covered, use two varicaps should be connected in electrical-anti-paralell (not DC), it is easily possible to cover the 500-1600kHz band with remote tuning. 73 Jan-Martin LA8AK http://home.online.no/~la8ak/c.htm ---- Jan-Martin, LA8AK, N-4623 Kristiansand http://home.online.no/~la8ak/ |
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