User`s manual

ULSAR

Operation

Page 5-9

5.4.2 RF Output Level

The RF output level can be set between 50 and 60 dBmV in steps of 0.5 dB. The factory setting is 60

dBmV.

5.4.3 S/V Ratio

The S/V ratio can be changed between –8 and –20 dB. The factory setting is – 13 dB.

In case of two sound carriers: the S1/V and S2/V ratio are displayed. The S1/V ratio can be changed

between –11 and –23 dB and is default –13 dB. The level of S2/V is default –20 dB and changes propor-

tional to the S1/V value i.e. if S1/V is reduced with 2 dB, S2/V will also automatically be reduced with 2

dB. Cable network characteristics could influence these levels and result in a wrong sound2/sound1

ratio.That’s why it is also possible to adjust the S2/S1 ratio with –2dB/+3dB.

5.4.4 Calibration Slope

The slope of the RF output signal can be recalibrated. Recalibration is necessary in case a new filter

module has been installed or whenever calibration seems to be necessary.

5.4.5 Slope Control

This feature is very useful to align the PULSAR in the headend after combining all modulated signals to be

sent on the network. Use measurement equipment e.g. a spectrum analyser to check the slope of the

ULAR’s RF output after being combined with all the other channels. It is possible that the slope of the RF

spektrum is not flat anymore because of f.i. network characteristics. This can be compensated by tilting

up or down the slope of the P

ULSAR’s output.

Next to the control bar, the state of the slope is shown:

FLAT: No correction is done w.r.t. the calibrated slope

TILT UP: The slope is tilted up on the high frequency end.

TILT DOWN: The slope is tilted down on the high frequency end.

5.4.6 RF OUTPUT

The RF output can be switched on or off

In case of a PLL unlock error the RF output cannot be switched on.

5.4.7 Int. Sound Carrier

Use this submenu to switch on/off the internally generated sound carrier. In case of stereo sound the

internal sound carrier 1 will be displayed. The second internal sound carrier will be shown in the next

display.

5.4.8 Clamping-VAGC- Mod meter

These three important settings are shown on the same display because they are related to each other.

The

LEFT and RIGHT arrows are used to move through the different submenus. Press the UP and DOWN

arrow to enter into the edit mode of the different functions. The second line starts blinking.