Head-End Station STC 160 Head-End Digital

—> The display shows, e.g., the "Bx 1A TPS" menu.

"Bx" indicates the slot

"1"

"A"

"TPS

"

indicates slot no. 1 indicates channel strip "A"

Type of module

"850.0 MHz" frequency set

"V 15" software version of the module

—> If a channel strip is selected whose modulator is switched off, instead of the frequency or the channel "

– – –

" is displayed.

Bx 1B

OFF

TPS

V 15

—> Programming the channel strips "A" and "B" is almost identical. Exceptions will be indicated.

• Press the button.

—> The "Channel / frequency setting" – "OUTPUT" menu is activated.

C hannel

/ freQuenCy set ting

In this menu, you can choose whether you require the channel or frequency setting for the adjustment of the HF output. The channel setting covers the range of channels S21 … S41 and C21 … C69, the frequency setting covers the range from 42.0 MHz to 860.0 MHz.

Bx 1A /B

Freq.

OUTPUT Bx 1A /B

Channel

OUTPUT

The QAM signal is normally transmitted with a bandwidth of 8 MHz. This means that you can only use the channel centre frequency of the existing channel grid in the range of channels S21 … C69 (frequency grid 8 MHz).

The CCIR channel grid is 7 MHz in the range of the lower frequency bands

(channels C2 … S20). Therefore the frequency setting is used here. If one uses the existing channel grid of 7 MHz in these channel ranges, this will result in interference (overlapping) with the 8 MHz QAM signal packages, thus causing transmission problems.

- 20 - HDMH 660 CI TPS