Dawn CONTROL-1500A Manual page 38

CONTROL-1500A Single Axis Antenna Controller
5b. If the receiver's AGC has NEGATIVE polarity and only one receiver is interfaced to the
controller, connect a jumper from the controller's unused AGC input channel to connector
J1, pin 11. From MANUAL mode use the Scroll Up/Down keys to examine the signal
strength for the AGC channel which was not selected in step 3 above. If the signal strength
reading for that channel is greater than 10, adjust the OFFSET and GAIN pots for that
channel until the signal strength reading for that channel is less than 10. To lower the
displayed signal strength value, turn the OFFSET pot counter-clockwise and the SCALE
pot clockwise. When this is accomplished proceed to step 6.
6. In the next few steps of the procedure, the OFFSET and GAIN pots of the AGC channel(s)
connected to the receiver's AGC output are adjusted so that the 'off satellite' signal strength
value is between 50 and 100 and the 'on satellite' signal strength value is between 600 and
700. The adjustments are made from MANUAL mode. Note that the GAIN and OFFSET
adjustments are implemented using 20 turn pots. A lot of turns may be required.
To adjust the potentiometers, several quantities have to be identified for each receiver.
If the controller has NEGATIVE polarity, go to step 6b. For POSITIVE polarity AGC, the
installer needs to identify the satellite band (C or Ku) that resulted in the greatest 'on
satellite' voltage (strongest on – satellite received signal) and the least 'off satellite' voltage
(weakest off satellite signal).
In step 1, the 'on satellite' AGC voltage was recorded for both C and Ku bands. Which
voltage was larger, C or Ku? ____. In the following steps, when instructed to position the
antenna 'RCV1 - on satellite – strong band' align the antenna with the ____ Band satellite
found in step 1 (use the band specified at the end of the previous sentence).
In step 2, the 'off satellite' AGC voltage was recorded for both C and Ku bands. Which
voltage was smaller, C or Ku? ____. In the following steps, when instructed to position the
antenna 'RCV1 - off satellite – weak band' align the antenna with the ____ Band satellite
found in step 2 (use the band specified at the end of the previous sentence).
If both controller AGC inputs are utilized, record similar values for 'RCV1 – on satellite –
strong band' ______ (C or Ku band) and 'RCV1 – off satellite – weak band' _____ (C or Ku
band). If both controller AGC inputs are utilized steps 7 through 9 must be performed for
each AGC channel. Use the Scroll Up/Down keys to view the AGC channel whose pots
are being adjusted.
6b. For NEGATIVE polarity AGC, the installer needs to identify the satellite band (C or Ku) that
resulted in the least 'on satellite' voltage (strongest on satellite received signal) and the
greatest 'off satellite' voltage (weakest off satellite signal).
In step 1, the 'on satellite' AGC voltage was recorded for both C and Ku bands. Which
voltage was larger, C or Ku? ____. In the following steps, when instructed to position the
antenna 'RCV1 - on satellite – strong band' align the antenna with the ____ Band satellite
found in step 1 (use the band specified at the end of the previous sentence).
In step 2, the 'off satellite' AGC voltage was recorded for both C and Ku bands. Which
voltage was smaller, C or Ku? ____. In the following steps, when instructed to position the
antenna 'RCV1 - off satellite – weak band' align the antenna with the ____ Band satellite
DAWNco • 3340 S. Lapeer Rd • Orion, MI 48359-1320 • Ph (248) 391-9200 • Fax (248) 391-9207 • sales@DAWNco.com
Chapter 3 Installation/Setup 31