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If your antenna is very short in terms of wavelength, then shunt
capacitance will reduce the amount of received signal. Solutions include running the antenna wire directly to the receiver, using a preamp at the antenna, or using a short length of special high-impedance coax as feedline. The latter is what's commonly done with automotive AM radios. If the antenna isn't very short, then "tuning" is done by means of a matching network, which can compensate for mismatched coax line and the impedance transformation it causes. Roy Lewallen, W7EL mike wrote: When researching the cost of high impedance coax as a feedline, it apears globs of coax induced capacitance seriously degrates the ability to tune the circuit. Under these conditions, resonating frequencies requires extremely low inductance values. How do people get around this problem in a receive only situation? thanks, mike |
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