Chapter 6 - Measuring range
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6.4 Level
measurement
As soon as the instrument is set to a frequency (see “Frequency setting”), it begins to measure the
level and displays the measured value in dBµV in the level window.
The measuring range extends from 30 to 110 dBµV with a resolution of 0.5 dB.
The measuring bandwidth is automatically adjusted to the channel bandwidth being measured. The
measuring rate for the numerical level value is approx. 3 Hz.
6.4.1 MAX Hold function
In addition to the numerical level value, the level window also displays a yellow level trend bar whose
length changes proportionally to the level value.
A vertical red line remains on the trend bar to indicate its maximum level since the last tuning
process.
The repetition rate of the level bar is 10 Hz. Use this function as an aid when aligning the parabolic
antenna.
6.4.2 Acoustic level trend indicator
The acoustic level trend signal also helps you to align a parabolic antenna. The loudspeaker emits a
tone whose frequency changes in proportion to the level that is measured. The frequency of the
signal tone rises as the level increases.
The function can be switched on or off at any time via the menu
MODE
->
Acoustic level
->
on (off)
.
6.5 LNB
supply
The measuring receiver controls a connected LNB or a multiswitch using the conventional 14/18 V -
22 kHz control (max. four SAT IF levels) or with the DiSEqC control. The supply is short-circuit-proof
and provides a maximum current of 500
mA. In the event of a short circuit, or if the current is too
high, the instrument automatically turns off the LNB feed. If an external LNB feed is present that is
higher than that set, this feed is also switched off. The LNB-LED lights up as soon as the LNB feed is
active.
6.5.1 14/18 V – 22 kHz control
LNB -> DiSEqC -> off
activates the 14/18 V - 22 kHz control (or DiSEqC off). Once it is active, the
LNB feed is set to 0
V. The required SAT IF layer can be set via the menu
LNB
->
SAT-IF-Layer
->
14 V, 18V, 14 V/22 kHz, 18 V/22 kHz
.
6.5.2 DiSEqC
DiSEqC defines a standard which transmits control commands from the master (e.g. receiver) via the
RF cable to the slave (e.g. multiswitch, positioner) using FSK (frequency shift keying with 22kHz).
DiSEqC is backward compatible with the 14/18 V – 22 kHz control.
The following diagram shows the chronological sequence of a DiSEqC1.0 sequence:
The 14/18 V - 22 kHz control follows immediately after a DiSEqC sequence. This allows non-
DiSEqC-compatible components to be run when DiSEqC control is active.
