Stats: 3,190,639 members, 7,941,482 topics. Date: Friday, 06 September 2024 at 07:57 AM |
Nairaland Forum / Entertainment / TV/Movies / Satellite TV Technology / C Band Lnb Skew (13546 Views)
Multi - Lnbf(2 In 1 Lnb) / All About C-band Lnb Installation / 3 On 1 Lnb On 90cm (2) (3) (4)
C Band Lnb Skew by blexxonmak(m): 5:24pm On Jun 07, 2010 |
When one looks at one end of a standard linear c band lnbf,one would observe that it is calibrated in degrees. The calibrations 30-0-30 are the SKEW (or POLARITY) MARKINGS. For zero degree skew (skew=0),the 0 mark on the lnb should be horizontal. Similarly,for skew=90 degrees,the 0 mark should be straight up or down. Inside the throat of the c band lnb are two probes (antenna). The one parallel to the bar that runs across the diameter of the lnb is the horizontal probe,while the other is the vertical probe. Reception from a given satellite is achieved when the three parameters,namely azimuth (az), elevation (el) and lnb skew (or polarity) for the satellite are properly set. These parameters are function of location (longitude and latitude of the installation site) and can be obtained using satellite calculator Correct adjustment of the skew will put the probes (antenna) inside the lnb in the correct position to receive from that satellite. The antenna in the c band lnb are exactly 90 degrees apart and therefore you do not need to worry about choosing between the horizontal or vertical adjustment. That is to say,if you align the vertical adjustment,for example,the horizontal adjustment is automatically correct and vice versa. 1 Like
|
Re: C Band Lnb Skew by freshp(m): 5:33pm On Jun 07, 2010 |
thanks for the Educational input, Just a digression---Pls can you tell me how you Insert the mobile phone as your message icon---just wondering, cos i cant seem to find it in the options. ![]() |
Re: C Band Lnb Skew by blexxonmak(m): 5:50pm On Jun 07, 2010 |
@freshp.It appears automatically when you post via a mobile phone. |
Re: C Band Lnb Skew by freshp(m): 5:58pm On Jun 07, 2010 |
blexxonmak:D**mn!!! I should have known ![]() thanks all the same. ![]() ![]() ![]() |
Re: C Band Lnb Skew by blexxonmak(m): 10:15am On Jun 08, 2010 |
For FIXED DISH SETUP all you need to do is to set your dish to the az and el for the satellite and then skew the lnb. Step 1-Set the c band lnb skew at zero. Step 2-Use sat calculator to obtain calculation for polarity adjustment for the satellite you wish to receive. Step 3-Turn the lnb the appropriate amount of degree from the zero setting and you are good to go. The initial adjustment of the polarity is done by educational guess. On reception the lnb is turned by small amounts to peak the signal. I assume the FD ratio of your dish has been properly set. |
Re: C Band Lnb Skew by blexxonmak(m): 12:15pm On Jun 08, 2010 |
For a MOTORIZED DISH SETUP you do not need to skew the c band lnb. However, you have to observe the following procedures. Step 1-Rotate your dish to face the horizon. At the horizon el=0 degree. Now turn your c band lnb until the 0 mark points straight up or down. Observe that if this is done properly, the vertical probe inside the lnb should be parallel to your mount pole. This is why it is always emphasized you make sure the mount pole is plump. Setting your lnb this way ensures you get the same polarization (H or V as the case may be) for any transponder as listed by Christian Lyngsat. Step 2- Attach the motor drive. Have the motor drive in position so that the dish antenna is centered on the mount. Now adjust the nuts on the elevation bolt to set the mount for your site latitude,which should be roughly your latitude number in degrees plus about 0.5 degree. Step 3- Adjust the nuts on the declination bolt to obtain the correct setting for your site latitude. The above rough settings should be close enough to acquire a signal on the satellite whose position is closest to your longitude. For example, my longitude is 7.5 degree East hence, the satellites closest to my location are EW3A @7 degree East (KU band) and EW2A @10 degree East (C band). Also notice that the lnb is automatically and correctly adjusted (skewed) as the motor drive moves the dish from one horizon to the other.
|
Re: C Band Lnb Skew by GeorgeD1(m): 9:25am On Jun 09, 2010 |
blexxonmak, good job blexxonmak. you need to follow up with some pictures to drive your point home. |
Re: C Band Lnb Skew by blexxonmak(m): 5:11pm On Jun 09, 2010 |
@George. Thanks. I shall post the pix later. |
Re: C Band Lnb Skew by kfykdot(f): 10:18am On Jul 18, 2014 |
@blexxonmak pls check your mail |
Re: C Band Lnb Skew by Nnachi404(m): 4:51pm On Sep 16, 2014 |
Good post any free to air lover should read hummmmmm good old days free to air was good not now dongle have some guy's lazy |
(1) (Reply)
Free To Air Channels On Hitv / Consat Satellite Subscription Payment Option/ How To Recharge Your Consat / The Infinity Tv Hd Decoder Is Up For Grabs!
(Go Up)
Sections: politics (1) business autos (1) jobs (1) career education (1) romance computers phones travel sports fashion health religion celebs tv-movies music-radio literature webmasters programming techmarket Links: (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) Nairaland - Copyright © 2005 - 2024 Oluwaseun Osewa. All rights reserved. See How To Advertise. 17 |