User's Manual

WaveCom Electronics Inc

MA4061/MA4070 Manual; MAN1L2301 Rev03 (Mar 2002)

Approved: R. L.

3.2 Front Panel Operating Modes

3.2.1 MA4061 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 arrow 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

IF AGC Disabled

Pressing the Up or Down buttons will toggle the display between Enabled and Disabled. When enabled, the

MA4061 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 arrow buttons. To configure the MA4061 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. To

adjust the RF level, use the UP/DOWN arrow 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.