background image

   

  

Wiring The Actuator

The direct burial cable’s actuator line is comprised of five stranded wires. Two

14 or 16 gauge stranded wires are used to power the motor and three color-

coded 22 gauge shielded wires connect to the sensor. These actuator wires

should be connected to the appropriate terminals on the back of the receiver

(or a separate actuator power supply).

Like the servo motor wires, the three shielded motor sensor wires also provide

power, pulse, and ground. The vast majority of actuator motors do not require

power to be hooked to the sensor. Look inside the actuator housing. If there

are only two wires connected to the sensor, then hook up pulse and ground to

their respective terminals. IF there are three wires connected to the sensor,

and pulse and ground interchangeably to the other two sensor wires.

The two large stranded wires connect to the large wire terminals at the

actuator motor and to the motor wire “1” and “2” terminals on the back of the

receiver or power supply. Now try to move the dish to the east or west; if the

dish moves in the direction opposite to the on intended, reverse the wires

connected to the motor wire “1” and “2” terminals.

Some satellite receivers have an external power supply that puts the large

transformer outside of the receiver chassis. This reduces the receiver’s size as

well as its operating temperature. The power supply is actually a large

transformer that turns 110 or 220 volts a.c. into 24 to 36 volts d.c. to power the

actuator’s d.c. motor.

Grounding The System

If your home’s a.c. electrical ground is close to the dish, use a No. 10 AWG or

larger solid copper ground wire to connect it to the pipe supporting the antenna.

If your dish is physically removed from your dish is physically removed from

your home, pound in a separate grounding rod and use a No. 10 AWG or

larger solid copper ground wire to connect the pole to it. You should also install

an antenna discharge unit or ground block, a passive electrical device that

connects in-line between your outdoor electronics and the indoor satellite

receiver. To work properly, the ground block should be connected to a ground

rod or to the a.c. ground of the house. For added protection prior to a lightning

storm – or whenever your system is left unattended and unused for long

periods of time – you should first unplug the satellite receiver from the a.c. wall

outlet and then disconnect the incoming coaxial cable(s) from the IF input of

the receiver. After the storm has passed, reconnect the coaxial cable to the

Summary of Contents for Large Dish

Page 1: ...off and the dish flung through the sky Because roof top installations are more susceptible to microwave interference than those on the ground a site survey with a spectrum analyzer or an on site rooftop demonstration with a small potable dish is an absolute necessity in any country where microwave interference is a major potential problem If several of your neighbors have antennas you can check wi...

Page 2: ...hich is curved so that it resembles a hook allows the feed to be mounted looking back at the center of the dish Guy wire kits are available for button hook supports that will provide the additional stability required for reception of both C and Ku band signals Ku band signals are much higher in frequency and there fore are beamed Earthward in much smaller wave lengths Consequently the antenna curv...

Page 3: ...ntenna s rim so that it crosses in the center of the dish The depth will be the distance from the antenna s center to the string Many feeds today have adjustable scalar rings These feeds can be broken down into two parts a round flat scalar plate with concentric circles on its surface and the wave guide onto which the LNB is mounted This wave guide fits into the center of the scalar plate and can ...

Page 4: ...iewing TV signals and watching the receiver s signal level indicator If you are going to have a technician during the final stages of the installation he will have a portable meter to use at the dish Two people also can talk back and forth via walkie talkie or portable phone while one makes adjustments to the dish and the other keeps an eye on the quality of the reception Direct burial satellite c...

Page 5: ...c impedance rating of 50 ohms and is not suitable for satellite TV use Be sure that the cable you buy is 75 ohm coax There are several different kinds of 75 ohm coaxial cable available RG 59U coax can be used to span distances of up to 100 feet For longer lengths lower loss RG 6 or RG 11 are used Direct burial satellite cable contains one or two spans of RG 6 Since RG 6 is slightly larger in diame...

Page 6: ...e and black for ground A stranded wire is used because it is more flexible and won t break as easily as a solid wire The shield an aluminum foil wrapped around all three wires keeps impulse noises from entering the line and giving false pulses to the receiver The receiver uses pulse to keep track of the position of the feedhorn s pick up probe You therefore can adjust or skew the position of the p...

Page 7: ...minals Some satellite receivers have an external power supply that puts the large transformer outside of the receiver chassis This reduces the receiver s size as well as its operating temperature The power supply is actually a large transformer that turns 110 or 220 volts a c into 24 to 36 volts d c to power the actuator s d c motor Grounding The System If your home s a c electrical ground is clos...

Page 8: ...omewhere in the middle of the continent observe how they are mounted on existing systems in your area or ask your satellite retailer which is the correct method for you Dish Alignment Settings You have now completed the basic construction of the dish and are eagerly anticipating your first pictures from space To fine tune those pictures and get your dish to track you or someone you can communicate...

Page 9: ...ast satellite to the east and west Setting the polar axis elevation of the dish Extend the drive until the dish is looking at the highest point in the sky Set the inclinometer onto the polar axis of the mount to the correct elevation angle for your location Setting the declination Declination is the offset angle between the polar axis of the mount and the rim of the dish which permits the antenna ...

Page 10: ...en as you move the dish past a satellite You can go back to where the flashed occurred turn off the scan feature and identify the satellite by comparing the programming you encounter to the satellite TV program grids Some satellites only carry a few active transponders Without the scan feature you would need to select an active transponder and tune to the correct polarization before you could find...

Page 11: ...just viewing the picture on the TV screen 4 For locating satellite in the lower section of the Clarke Orbit push the dish right and left on the pole and move the drive east and west in slight increments until you are satisfied you have the strongest signal Then tighten the mount s bolt onto the pole so that the dish won t rotate Do not tighten them down firmly yet however Note the numerical readin...

Page 12: ...tomatically appear on their respective channels on the TV If your satellite receiver does not have this feature you will need to purchase an A B switch from your local satellite or electronics store Both the satellite receiver and local antenna connect to the A and B input ports on this switch while the single output port connects to the antenna input on the TV This switch will have to be changed ...

Reviews: