Adjusting The Agc Target Level; Setting The Passcode (Dwdm Versions Only); Setting The Lnb Voltage Level - evertz MultiFrame 7700 Manual

7700/7800 MultiFrame Manual
7807LT-2 Dual Wideband RF Fiber Transmitter

6.1.6. Adjusting the AGC Target Level

The target output level to be maintained by the 7807LT-2 when AGC mode is user adjustable.
Adjustment of this parameter allows optimal laser depth of modulation and CNR performance to be
achieved. A typical value is –20 to –10 dBm, but for optimal performance it is recommended that a
spectrum analyzer be connected at the receive side of the link while this value is adjusted to provide the
best CNR performance while not introducing distortion products which may appear as an increase in the
noise floor while increasing the target level, or as "spectrum skirts". To set the AGC target level, select
the CTRL menu item in the first menu level, then use the toggle switch to display the OUTL option and
press the pushbutton to select it.
CTRL
OUTL
CH1/CH2
0 to -50 dBm

Note that this menu item is only applicable and visible when the card is set to operate
in AGC mode.

6.1.7. Setting the Passcode (DWDM versions only)

Due to the high-powered lasers used on the DWDM version of these cards, it is possible to turn the laser
on and off and protect this function with a passcode. This provides added optical safety. Depress the
pushbutton and select the PSWD option. Actuate the toggle switch to achieve the correct code number
(Factory Default Passcode = 0000).
CTRL
PSWD
0-9999
PSWL+
LASR+
0000-9999
ON
OFF

6.1.8. Setting the LNB Voltage Level

The voltage level for LNB power is user adjustable. To set the LNB output voltage level, select the CTRL
menu item in the first menu level, then use the toggle switch to display the LNBV option and press the
pushbutton to select it.
CTRL
LNBV
CH1/CH2
18V
13V
OFF
Page - 20
0 to -50 dBm
Store a
PWSD
configuration. This menu is not available without entering the
correct passcode.
Enable / Disable Laser. Only visible for DWDM versions.
LASR+
Sets the LNB output voltage.
Sets the LNB output voltage to 18 volts.
18V
Sets the LNB output voltage to 13 volts.
13V
Disables the LNB output voltage.
OFF
Revision 1.2
AGC output signal target level (default –20 dBm).
new passcode (0-9999) required for BLOCK