Sea Tel ST88-21 C/Ku-Band TVRO, Installation And Operation Manual

Page: 67 / 145

ST88-21 C/Ku-Band TVRO Setup – Home Flag Offset
7-3
“home” was to the right of bow) this difference of 09.0 to the bow line position 000.0. Therefore
“home” should be 90.0 Relative.
8. I now calculate the HFO = = ((90.0) / 360)) x 255 = 0.25 x 255 = 63.75 which I round off to 64.
9. I set, and Save, HFO to 222 using the “To Enter the HFO value” procedure below. After I re-initialize
the relative position of the antenna is now calibrated.
10. If there is a small amount of error remaining, I will use AZ TRIM in the Optimizing Targeting
procedure to correct it.
7.1.4. To Enter the HFO value in the DAC_2202:
To enter the calculated HFO value, press and hold both LEFT and RIGHT arrows for six seconds to enter the
parameter menu at the EL TRIM parameter window. Press DOWN arrow key numerous times (about 21) until
you have selected the REMOTE COMMAND window.
In the REMOTE COMMAND window, press the LEFT arrow key until you have underscored the left most
character in the displayed value (ie the A in "A0000"). Use the UP/DOWN arrow keys to increment/decrement
the underscored character until it is upper case
N
(“N0000” should appear in the command window). Press
the RIGHT arrow key to move the cursor under the most significant digit, then use the UP arrow key to
increment it to a value of 6 (the display is now “N6000”). Set the three digits to the right of the 6 to the three
digit HFO value from 000 to 255 (corresponding to 0 to 360 degrees) that you calculated above. Use the
LEFT/RIGHT keys to underscore the desired digit(s) then use the UP/DOWN arrow keys to
increment/decrement the underscored value. When you have finished editing the display value, press ENTER
to send the HFO value command to the PCU (but it is not saved yet).
If you want to find out what the
current
HFO value is key in N6
999
and hit
ENTER.
When completed, you must save the desired HFO value. Press ENTER several times to select the REMOTE
PARAMETERS display. Press the LEFT or RIGHT arrow key to enter writing mode and then press the ENTER to
save the HFO value in the PCUs NVRAM.
EXAMPLE:
In the “You Observe “Home” Pointing is LEFT of the Bow-line” example above, the HFO
calculated was 222. To enter this value:
1. Set the Remote Command value to "
N6222
".
2. Press
ENTER
to send this HFO to the PCU. The display should now show "N0222".
3. When completed, you must save the desired HFO value. Press
ENTER
several times to select the
REMOTE PARAMETERS
display. Press the
LEFT
or
RIGHT
arrow key to enter writing mode and
then press the ENTER to save the HFO value in the PCUs NVRAM.
You must drive the antenna CW in azimuth until the home switch is actuated, or re-initialize the antenna
to
begin using the new HFO value
you have entered and saved. To re-initialize the antenna from the
REMOTE COMMAND window of the ACU;
4. Press UP arrow key several times to return to the REMOTE COMMAND display.
5. Press the
LEFT
or
RIGHT
arrow key to enter edit mode. Use the
LEFT
/
RIGHT
and
UP
/
DOWN
arrow keys to set the character and digits to "
^0090
" and then press the
ENTER
key.
This resets the PCU on the antenna. The antenna will reinitialize with this command (Performs a similar
function as a power reset of the antenna) and the new home flag offset value will be used to calibrate the
Relative position of the antenna.