Re:This story is wrong. (Score 1)

Hello everyone. You're right. The last thing one would want is to transmit long distances via skip at HF. This is not quite the same from 45 - 70 MHz. The main advantage is the long wavelength means non-line-of-sight. The need for LOS is the main problem with Wi-Fi which is also used in regional comms. There was a general misunderstanding about the bandwidth usage as well. The 7 Mhz band refers to the available TV channel. You are quite right. There are 28 x 250 KHz channels within 7 MHz and we would aim to do this, not 250 kbps over 7 MHz!! The experimental results were that > 0 dB SNR was obtained at 40 kms with 20 Watts over 250 kHZ baseband bandwidth. This is the key result.