Wavetek 3HRV Manuel d'utilisateur télécharger pdf (Page 6)

Figure 13

Figure 14

Figure 15

AUTOMATIC CENTER FREQUENCY DEFAULT –

NTSC DIGITAL CARRIERS

If a digital channel is being enabled in the channel plan edi-

tor, please observe that an auto center frequency feature has

been implemented for NTSC channel plans. This feature adds

1.75 MHz to the video frequency of the channel being modi-

fied, and the measurement bandwidth now defaults to 5.6

MHz. Adding 1.75 MHz to the video frequency establishes the

center frequency in a standard 6 MHz bandwidth. The user

should always verify the 5.6 MHz measurement bandwidth

with the system operator, and adjust as needed.

EXAMPLE: Channel 89 is being converted from a video chan-

nel to a digital channel. The video frequency is 613.25 MHz,

and the measurement BW is 4 MHz (Figure 16). After convert-

ing the channel to a digital carrier, the center frequency is

615.00 MHz, and the measurement bandwidth is 5.6 MHz

(Figure 17).

Figure 16

Figure 17

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Wavetek 3HRV Manuel d'utilisateur Page 6