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ma4367_ml_03_sd Approved: B.G. 15
Vecima Networks Inc.
3.2 Front Panel Operating Modes
3.2.1 MA4061B Upconverter Modes
FREQUENCY
When this mode is selected, the display will read: Frq XXXX.XXXX MHz
The displayed frequency is the current configured Output Frequency. To adjust the output frequency, use the UP/DOWN
buttons. Single stepping will allow 62.5 kHz adjustment, while holding the buttons depressed will change the frequency more
quickly.
( The displayed frequency represents the center of the band.
( During frequency change, the output is muted and the RF ENABLED indicator is turned off for 5 seconds to avoid
undesirable interference.
AUTO IF
When this mode is selected, the display will read: IF AGC Enabled
or
IF AGC Disabled
Pressing the Up or Down buttons will toggle the display between Enabled and Disabled. When enabled, the MA4061B will
automatically optimize the IF level and ensure it is within a pre-set threshold range (default ±0.5 dB). When disabled, the IF
level can be manually adjusted as described in the next section.
( The Auto IF mode should only be used for continuous IF inputs (non-bursty).
( If the IF level is not within ±4.0 dB of the optimum level during Auto IF mode, the output will be muted to avoid
undesirable interference, and the Alarm LED will be on.
( At the time of shipping, the AUTO IF is enabled.
IF LEVEL ADJUST
When this mode is selected, the display will read: IFPwr ±XX.X dB
The display indicates the approximate IF power level measured at the internal IF power detector. To adjust the IF level, use the
UP/DOWN buttons. To configure the MA4061B Upconverter for optimum performance, the IF level should be adjusted to read
approximately 0.0 dB (-0.5 to +0.5). An IF level less than 0 dB will degrade noise performance and a level above 0 dB will
promote intermodulation products.
( The IF level can only be adjusted if the Auto IF mode is disabled.
RF OUTPUT LEVEL ADJUST
When this mode is selected, the display will read: RFPwr ±XX.X dBm
The display indicates the approximate RF output power level measured by the internal RF power detector at the output of the
MA4061B upconverter. To adjust the RF level, use the UP/DOWN buttons. The RF output level may be set within the range of -
15 dBm to +3 dBm.
( Ensure that the IF level is correctly set before adjusting the RF level.
( Adjustments of the MA4061B output level will also directly affect the output level of the MA4070C power amplifier.