Simplex Operations meant two-way communications by using same frequency at one time..it's also called Half-duplex communications..it's because only one person can talk at one time, after finish the transmission then other person can talk..thats the cycle-continuously..beside that, simplex operation also work at FM, SSB, CW mode also PSK-31..in HF especially, Simplex operation are use because when propagation is good, the signal can go far..it's more attractive..some fading (QSB) can be happen, when our location are in skip zone..it's can be manage, when u do some homework or experiment or listen the signal even QSB but sometimes if luck beside u, suddenly, u can copy the audio..it's may be the F2 layer have move up or down..or maybe the take off angle from that station..anything can be happen..so, try your best to get the best..
73/88 de 9M2ODY
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