Research Concepts RC2500 User Manual
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RC2500 Antenna Controller
Chapter 4
Inclined Orbit Satellites
Research Concepts, Inc. • 5420 Martindale Road • Shawnee, Kansas • 66218-9680 • USA
www.researchconcepts.com
For Positive AGC J=3.177, for Negative AGC J=1.823.
K=0.02326 and L=0.004525 for AGC1, and
K=0.200 and L=0.01639 for AGC2.
Don’t get nervous, you’ll be walked through in the procedure in the following paragraphs.
Although if you’re feeling your mathematical oats, then do the calculation!
5. Subtract the “Off Satellite” Voltage from the “On Satellite” Voltage according to the formula below:
“On Satellite” Voltage - “Off Satellite” Voltage = Difference Voltage
Remember that these two voltages and the result may be positive or negative…And subtracting a
negative number is equivalent to adding its positive counterpart. Note the result below.
Difference Voltage = __________________
6. If this difference Voltage is negative, the receiver has NEGATIVE AGC polarity. If the difference is
positive, the receiver has POSITIVE AGC polarity. Circle the AGC polarity chosen below.
AGC Polarity = negative or positive
7. Now remove the negative sign, if any, from the Difference Voltage recorded above. Note this
magnitude value below. If this number is less than 1.3 volts, the AGC1 input will be used. Otherwise
the AGC2 input will be used. Circle the AGC channel you will be using below.
Magnitude of the Difference Voltage = _____________________
Using AGC1 or AGC2
8. Determine the “Scaled On Sat Voltage” by dividing the “On Satellite” Voltage of Step 1 by the result of
Step 7. Note the result below:
Scaled On Sat Voltage = _____________
9. Calculate the Offset Voltage, Voffset, using the results of Step 8 and one of the four equations below.
Note the Resulting value.
For AGC1 and Positive polarity (see Steps 7 and 6) use the following equation:
For AGC1 and Negative polarity (see Steps 7 and 6) use the following equation:
For AGC2 and Positive polarity (see Steps 7 and 6) use the following equation:
For AGC2 and Negative polarity (see Steps 7 and 6) use the following equation:
Voffset = _______________________
10. If you ran the PC program, enter the calculated Voffset on the line above. Go to CONFIG mode and
use the SCROLL keys to bring up the AGC Polarity Flag item. Key in the proper polarity (chosen in
07388
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.
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.
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Satellite
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04240
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On
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3646
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