- #1
cyclone24
- 35
- 0
Hello
All this while in the literature it is advised to shorten your wires or cables to less than 1/20 wavelength in order for them to NOT act as antennas.
But I also read that sometimes even 1/50 or 1/100 wavelength at a certain fundamental frequency. For example, at 100 MHz, the wavelength is 3 m. Its 1/20 wavelength is 15 cm. 1/50 is 6 cm. Some say even this is not enough.
I would like to know when is it not enough? What are the conditions where the cable < 1/50 can still radiate? Many military specifications are strict about this and play safe by setting the dimensions too small.
All this while in the literature it is advised to shorten your wires or cables to less than 1/20 wavelength in order for them to NOT act as antennas.
But I also read that sometimes even 1/50 or 1/100 wavelength at a certain fundamental frequency. For example, at 100 MHz, the wavelength is 3 m. Its 1/20 wavelength is 15 cm. 1/50 is 6 cm. Some say even this is not enough.
I would like to know when is it not enough? What are the conditions where the cable < 1/50 can still radiate? Many military specifications are strict about this and play safe by setting the dimensions too small.