The original antenna system was a diplex layout with sister station 1190, which was formerly KNBA Vallejo.
2.
For example, WANN-CD has a permit to use an omnidirectional antenna for digital TV, but received an STA to diplex into the same antenna used by analog WANN-LP, which has a slightly directional antenna.
3.
This design did not scale to more than a few networks, so the Channelmizer was introduced a 2.5 " tall rack mountable device with separate US and DS RF ports, the diplex filter switch, and an Ethernet port.
4.
A more major update was the MK-747, which added a new antenna from Raytheon, the Diplex Gating Unit ( DGU ), a bandpass filter and other modifications, to produce the AN / FPS-91 and 91A . The similar MK-748 applied to the-60 series resulted in the AN / FPS-64A,-65A,-66A and-67A . Canadian AN / FPS-87s were also converted, becoming AN / FPS-93 and 93A . These units were used with the SAGE system.
मोबाइल