- #1
davidhills
- 9
- 0
Good Morning
Can anyone help me understand why, apparently the physical length of a monopole end feed wire for a crystal set need to be ½ the wave length of the desired signal.
The reason I ask is, that I understood that, if you have a variable coil in series with the antenna, the resonate frequency is the combination of the coil and antenna impedance, so you can compensate for any antenna length within the range of the variable coil.
So what is the problem of a 3 meter antenna with the correct compensating coil?
Is it due the fact that a crystal radio needs to raise it power from the antenna an a longer antenna can absorb more power?
A pointer in the direction of some good practical explanation would be great
Thanks
David
Can anyone help me understand why, apparently the physical length of a monopole end feed wire for a crystal set need to be ½ the wave length of the desired signal.
The reason I ask is, that I understood that, if you have a variable coil in series with the antenna, the resonate frequency is the combination of the coil and antenna impedance, so you can compensate for any antenna length within the range of the variable coil.
So what is the problem of a 3 meter antenna with the correct compensating coil?
Is it due the fact that a crystal radio needs to raise it power from the antenna an a longer antenna can absorb more power?
A pointer in the direction of some good practical explanation would be great
Thanks
David