RC3000 Antenna Controller

Chapter 3

Detailed Operation

3.3.2.1 Analog to Digital Voltage

The AD VOLTAGES maintenance screen shows the current voltage levels sensed at the microcontroller’s 4 analog to digital inputs. The voltage will be displayed in the 0.001 to 5.000 range. If the microcontroller sees less than 0.001, it will display “UNDER”.

Note that all of the analog to digital channels have some associated scaling and conditioning circuitry in the RC3000. Therefore the voltages seen at this screen will not be exactly the same as the input voltages external to the RC3000.

AZ:

1.114

 

AD VOLTAGES

EL:

1.143

1

L1:1

POL:

UNDER

 

L2:0

SIG:

3.756(1) <1>RF <2>SS1 <3>SS2 <4>AUX

AZ: / EL: / POL:

The first three A/D channels are dedicated to the azimuth, elevation and polarization position sensing inputs.

Next to the elevation voltage is displayed a 0 or 1. 0 means the elevation sensor circuit is currently operating in the “low” region while 1 indicates it is operating in the “high” region.

SIG:

The fourth channel (signal strength) is multiplexed between four sources (autopeak RF, signal strengths 1 and 2 and an auxiliary input). Pressing keys 1-4 allow selecting of one of the signal source inputs for display.

On first generation controllers, the signal source # 4 is tied to ground and should indicate a value close to 0.000 (maybe UNDER). On second generation controllers, this input may be used for other signals (see your appendix B).

L1: / L2:

These fields show the status of the signal lock 1 and 2 inputs. A logic high signal is indicated by a “1”.

RESOLVER DATA

If a particular mount implements resolver sensors, this screen will also shows “raw resolver” angles and counts.

AZ:

1.114

181.30

33004

AD VOLTAGES

EL:

1.143

1 122.30

22264

22.3

L1:1

POL:2.237

181.30

33044

 

L2:0

SIG: 3.756(1) <1>RF <2>SS1

<3>SS2 <4>GND

The azimuth, elevation and polarization resolver angles and counts displayed are read directly from the resolvers without being biased by offset terms. The displayed values will though reflect if the azimuth, elevation or polarization resolver polarity has been reversed.

As an aid in calibrating the elevation resolver, the angle resulting from applying offset a reverse factors is also displayed on the EL: line.

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