Televes Avant 7, 6 In/1 Out FM-BIII/DAB-TB-U-U-U (790 MHz) - Manual (Page 16)

Programmable head-end amplifier
16
Troubleshooting
Channels are not adjusted to the programmed output level: Check that the
programmed filter for the highest output channel has both presence of signal
and the right level, since this value is taken as a reference for the adjustment of
the selected output level.
The channels entering through the input of BIII are regulated incorrectly:
If we are entering only one channel through this input, its level would be set
5dB below the UHF level channels. But if, with the same level, we introduce
several channels, the Avant will treat them like a higher-level single channel,
thus reducing the level adjusted of all of them regarding to the one it would be
obtained for just one channel.
If we need to amplify several channels coming from other processing units, we
recommend entering them on the input “Broadband (47-862 MHz)”.
Channels in the broadband input are not equalised as regards filter:
The “broadband” input amplifies signals coming from satellite receivers, the
recommended level for this input is between 70 and 74 dBµV (for UHF channels)
to get these channels equalised with the rest of the adjusted channels. If the
level applied is below the indicated range, these channels will have a lower level
than the rest; on the other hand, if the level is higher there will be disturbances
due to the intermodulation of channels.
A high/low level detected in an input or a filter: The adjustment process
begins with the verification of the signal levels introduced in the FM (2) , BIII input
and finally with the verification of the programmed filters. The indication that
the FM (2) or BIII level is low when we do not apply the signal in these inputs will
not affect the rest of the selected channels.
We must remember that the level indications in the FM (2) , BIII inputs and filters
shown on the programmer’s display are a reference for the adjustment process,
being the unit able to balance channels, where a level error has been found,
whenever input levels do not present large variations as regards the maximum
specified range.
Refs. 532940, 532970
Inputs UHF1 UHF2 UHF3
FM => (532940)
BI/FM => (532970)
BIII/DAB 47-862 MHz
Band MHz 470 - 790
87 - 110 => (532940)
47 - 110 => (532970)
174 - 260 47 - 370 370 - 862
Gain dB Auto (max. 55 ± 3) .
Auto
(max. 45 ± 3)
Auto
(max. 46 ± 3)
Auto
(max. 40 ± 2)
Auto
(max. 43 ± 2)
Filters configuration No.
10 0 0 - - - -
9 0 1 - - - -
7 2 1 - - - -
6 3 1 - - - -
5 3 2 - - - -
No. channels per filter Nº 0 - 5 ** - - - -
Slope adjustment dB 0 - 9 ** - - - -
Optimum input margin dBμV 60 - 105 60 - 85 62 - 87 69 - 73 70-74
Gain regulation dB 0 - 20 * 0 - 25-OFF* 0 - 25-OFF* - -
Manual reg. gain dB ± 9 (per filter) ± 9 ± 9 - -
Output level *** dBμV 124 124 124 124 124
Output level regulation dBμV 100-115 90-105 95-110 95-110 100-115
Noise figure dB 9 10 10 -
TEST Output dB -20
Rejection dB 20 (±16 MHz) 20 (±16 MHz) 20 (±16 MHz) -
Input powering
(automatic) I. max. V=
mA
24 - 24 (1) - -
60 - 60 (1) - -
Mains voltage/frequency V~/Hz 196 - 264 / 50-60
Maximum current mA 150
Max. power consumption W 16
Max. working temperature ºC 45
Weight gr. 2,800
Dimensions mm 320 x 258 x 60
Protection index IP 20
* Automatic adjustment (Depending on the wished level of exit and the signal of entrance).
** Programmable adjustment.
*** The output level depends on the nº of channels.
(1) 532970
(2) 532970 => BI/FM