Research Concepts RC2500 - Manual (Page 61)

54 RC2500 Antenna Controller Chapter 5 Modes
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ENTER DATE (MM.DD.YY):07.03.92 CONFIG
USE 0-9 OR . ENT,BKSP,SCRLL ^v
Enter the current date in the format shown. Again, use the 0-9 keys to enter the month, day, and year
fields, and use the . key to separate fields. Single digit fields must be entered with a 0 preceding, as
shown in the example for 07.03.92.
Note: The RC2500 is Y2K compliant. The sidereal time is derived from the real-time clock as the
number of seconds that have elapsed since 00:00 on 1 January 1992.
5.8.8 Signal Strength Parameters
The controller has to have signal strength information for tracking inclined orbit satellites. Signal strength
information is generally obtained from the receiver's automatic gain control (AGC) system. The
procedures used to adjust the controller's AGC input circuits and obtain these parameters is described in
section 4.4.1 - AGC Adjustment and Configuration. Access to these CONFIG mode items is permitted
only when the EXPERT ACCESS FLAG is set. The AGC port signal-strength is displayed in MANUAL
mode but it is only used during track modes, therefore this section may be ignored for the RC2500A
controller.
AGC POLARITY FLAG;1 CONFIG
0-NEGATIVE 1-POSITIVE ENT,BKSP,SCRLL ^v
The AGC Polarity Flag tells the controller what the sense is on the input AGC voltage used for tracking.
A positive sense is defined as one that increases in magnitude as the RF signal strength increases. If the
AGC voltage decreases as the RF signal increases, its sense is considered negative. Enter the
appropriate value, either 0 or 1, followed by ENTER to key in the value.
AGC C BAND THRESHOLD:125 CONFIG
0 - 999 ENT,BKSP,SCRLL ^v
When the receiver is tuned to a C band satellite and the signal strength is above the AGC C Band
Threshold value, it is assumed that a satellite signal is present. The same threshold is applied to both
AGC channels.
AGC K/L BAND THRESHOLD:150 CONFIG
0 - 999 ENT,BKSP,SCRLL ^v
This is similar to the C band threshold described above, except it pertains to Ku or L band. If the signal
strength is above the AGC K/L Band Threshold value when the receiver is tuned to a Ku or L band
satellite, the controller assumes that a satellite signal is present.
5.8.9 Antenna Parameters
The following items specify antenna related parameters which are used by the tracking system. Access
to these items is only permitted when the EXPERT ACCESS flag is set. These parameters are used only
in the track modes, therefore this section may be ignored for the RC2500A controller.
ANTENNA LATITUDE LL.L: 38.9 N CONFIG
TENTHS AFTER DEC. PT ENT,BKSP,SCRLL ^v
ANTENNA LONGITUDE LLL.L: 97.5 W CONFIG
TENTHS AFTER DEC. PT ENT,BKSP,SCRLL ^v