The are using a duplex frequency system where the base transmits on one frequency and listens on another AND the mobile units transmit on the freq the base listens on but listens on the freq the base transmits on.
2.4 ghz
EMS pokies jammers might work if you are talking about the jammers designed to operate the gambling machines in casinos. These jammers are generally owned and operated by the casino itself and are not legal to own.
Channel
Selective amplifier is an RF amplifier which selects particular frequency and amplifier so it can operate at fixed frequency.
The frequency of remote controls for the television varies from brand to brand. The ones that do operate using radio frequencies though are all generally low frequencies. Most remote controls today operate using infrared light signals though.
up to radio frequencies i.e 20-20kh
No, they operate on the standard wireless frequency: 802.11g.
Microwave ovens operate at about 2,450 MHz.
The frequency of a system bus is measured in Hz. Modern computer system buses operate at hundreds of MHz or at GHz.
Ultraviolet, X-rays, and gamma rays have higher frequency/shorter wavelength than visible light has.
divide cells into rings which will operate with different levels of frequency reuse