Config Mode Data - RESEARCH CONCEPTS RC2000C Manual

36 RC2000C Polar Tracking Antenna Controller
determine the scale factor if satellite pointing data is available for a similar antenna mount and actuator
set. Here, satellite pointing data refers to azimuth position counts for a pair of geostationary satellites at
known longitudes. If the position counts were not obtained with an RC2000, the user must determine
whether the controller used to obtain the data accumulates position pulses or position pulse edges (as
the RC2000 does). Multiply position pulse data by two to obtain position count data - see the discussion
above on obtaining the elevation scale factor from manufacturer's data for the distinction between
position pulses and position counts. The following calculation yields an approximate value for the
azimuth scale factor which generally gives adequate results.
In the following formula the position count and longitude associated with the first satellite is designated
CNT_1 and LON_1, respectively. The position count and longitude value associated with the second
satellite is referred to as CNT_2 and LON_2.
Here is the formula... ( (CNT_1 - CNT_2) / (LON_1 - LON_2) ) * 48
Round to the nearest whole number and convert negative numbers to positive numbers. Note that in the
denominator of the above expression (LON_1 - LON_2) refers to the difference in longitude values
between the two satellites. If LON_1 has a value of 5 degrees West and LON_2 has value of 7 degrees
East, then (LON_1 - LON_2) is 12 (= 7 + 5). If westerly longitude values are treated as negative numbers
the formula works fine.
(CNT1 _____ - CNT2 _______) / (LON1 _______ - LON2 _______) * 48 = ________
Change the sign to convert to a positive value. Enter at the Azim Constant CONFIG mode prompt.
Here is an example...
satellite 1
satellite 2
Here is the calculation...
simplifying yields
4.4.3

CONFIG Mode Data

This section briefly describes each of the CONFIG mode items and how they relate to the tracking
system. The names of CONFIG mode items appear in italics. The installer should go through this
section and enter in the relevant data. Be sure to terminate each entry with the ENTER key. If an entry is
terminated by depressing the SCROLL keys, the data entered by the user is not stored in non-volatile
memory. After all of the data has been entered, the user should go through the data items again to verify
that all entries were properly recorded.
The AutoPol Enable and AutoPol Vpol Level items are described in section 3.6. In TRACK mode the
AutoPol feature works the same as it does in the other modes. When a movement is in progress while
TRACK mode is active, the AutoPol signal may not be immediately recognized. It will be recognized
when the movement ceases.
The Remote Mode Enable, Comm Address, and Comm Baud Rate CONFIG mode items control the
operation of the REMOTE mode system. If REMOTE mode is enabled, commands may be received via
the serial port while tracking an inclined orbit satellite, and front panel control of polarization is disabled.
While TRACK mode is active, a remote command received which specifies an azimuth or elevation
movement will cause REMOTE mode to activate - no tracking occurs in REMOTE mode. A remote
command which is received that does not involve azimuth or elevation movement, will be serviced by
TRACK mode without disrupting the tracking operation in progress.
The Azim Slow Speed and the Elev Slow Speed codes are discussed in section 3.4. These speed
codes should be initialized because the tracking system uses these values to determine how fast to move
the antenna when making movements.
Research Concepts, Inc. • 5420 Martindale Road • Shawnee, Kansas 66218-9680 • USA www.researchconcepts.com
azimuth position count
1520
944
( (1520 - 944) / (-7 - 5) ) * 48
( (576) / (-12) ) * 48 = (-2304)
Chapter 4
longitude
7 degrees West
5 degrees East
Inclined Orbit Satellite