background image

   

  

satellites, but do not adjust the elevation to receive lower satellites.

7) Fine tune your tracking by repeating these steps until the satellites in both

the upper and lower sections of the Clarke Orbit appear at their maximum

signal strength without requiring any further adjustments. If this cannot be

done, you have probably made a miscalculation in the elevation or

declination settings. Once you have the dish tracking properly, firmly snug

the bolts that secure the mount onto the pipe. Placing a bolt all the way

through the pipe may be desirable in high wind areas. Mark the pole and the

mount for later reference.

The Final Connection

The final connection is from your satellite receiver to your TV set. We

mentioned above that you can hook up a coaxial cable directly from the “To

TV” (RF Out”) output of the receiver to the “Antenna” input of the TV set. Your

local antenna wire, which formerly was connected directly to the TV set, should

now be connect to the “Antenna” input on the back of the receiver. To watch

local channels, turn the satellite receiver off and the local channels will

automatically 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 manually whenever you want to go from one to

other. You also will need to use an external A/B switch if a second TV is

connected to the satellite receiver and one person wants to watch local TV

while the other is watching a satellite TV program.

There are other options when it comes to connecting the satellite system to

your TV set or home theater system. There are video and stereo audio outputs

on the back of your receiver. These can be connected directly to a TV monitor

or to a VCR for recording programs. Whenever a VCR is part of the overall

entertainment system, the output of the VCR must be connected to the TV set

and the local antenna is usually also connected to the “Antenna” input of the

VCR.

The satellite receiver’s stereo audio outputs can be connected directly to the

stereo inputs of the TV set or to the auxiliary inputs of your stereo system’s

audio amplifier or tuner.

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: