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HX50 Dual Dishes Problems(Read 7259 times) |
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FrstrtdSatCom
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★★ Offline Posts: 2 |
Jul 13th, 2011 at 7:32pm
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Eric Johnston
Senior Member
★★★ Offline Posts: 2109 |
Reply #1 - Jul 13th, 2011 at 9:11pm
Tuning
Satellite Channel Frequency XXXXX GLOBAL Receive Symbol Rate XXXXXXXX GLOBAL For W7 at 36 deg east, these should be (I think): Satellite Channel Frequency (100kHz) 19588 Receive Symbol Rate 10000000 LNB type There should be a pull down menu: LNB Type xxxxxxx If your LNB is HughesNet part number PN 1501882-0002 then it is called "Universal" and the LNB type pull down menu should be set to "Universal". If "Universal" does not show in the pull down menu then you have the wrong sbc.cfg file loaded into your modem. The pull down menu text comes from the sbc.cfg file. Contact Bentley Walker. Polarisation starting position and adjustment amount If your LNB is HughesNet part number PN 1501882-0002 then the direction of receive polarisation is the same as the LNB F connector cable. You need to START with the receive polarisation vertical. Then adjust the polarisation clockwise by an amount of degrees, as viewed from behind the dish looking forwards towards the satellite in the sky. If your dish has a giant circular polarisation scale on the back look at this image:  Note that the start position was with the feed support arm on the right hand side with the LNB F connectore pointed exactly downwards (true vertical receive). Then using the the giant scale, count an amount of degrees clockwise. This dish is in Afghanistan pointed at W7 at 36 east longitude. Their calculated polarisation adjustment was +39.8 deg. Pointing angles and polarisation adjustment amount Use these to get your angles: https://www.satsig.net/maps/satellite-dish-pointing-iraq.htm https://www.satsig.net/maps/satellite-dish-pointing-afghanistan.htm The blue line relative to your building might help. Study the other dishes closely and make yours look like theirs. HX Modem signal readout The scale goes from 0 to 29 maximum, for measuring general satellite power. You will get readings on any and all satellites. 29 is a powerful satellite. Once you are receiving the correct outlink carrier the scale will go into the range 30 - 100. If you can't get above 29 you may be on the wrong satellite, wrong polarisation or wrong configuration settings, particularly freq, symbol rate, 22kHz tone, LNB type. wxw Best regards, Eric. |
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« Last Edit: Jul 13th, 2011 at 10:13pm by Eric Johnston »
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FrstrtdSatCom
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★★ Offline Posts: 2 |
Reply #2 - Jul 13th, 2011 at 10:50pm
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Admin1
YaBB Admin
★★★★★ Offline Posts: 1206 |
Reply #3 - Jul 14th, 2011 at 8:21am
sbc.cfg file
If "Universal" is showing in the LNB pull down menu, the file is OK. The file contains this text which appears in the pull down menu: [RxLnbList] Default=10.60,10.60 Universal=10.6,9.75 Standard=11.3,11.3 Polarisation It is possible to have the feed support arm at the bottom and then to turn the feed assembly in its yokes to set the polarisation starting position and then apply the adjustment ( * ). This is what Bentley Walker suggest as it is simple to implement. Doing this is reported to give acceptible cross-polar measurements, but it is not my recommended method. If the feed horn throat has "505" marked on it, this feed is called a "mode matched feed" and is intended to be always oriented so that the "505" is directly away from the feed support arm. There is a lump underneath (with 3 mode generating slots inside) which should be towards the feed support arm. The purpose is to achieve excellent cross-pol isolation and minimum interference on both downlink and uplink. Finding the satellite It is quite likely that you are peaked up (26) on the wrong satellite. Try going up left and down right to check out the adjacent satellites, which are in a diagonal sloping line in the sky, at right angles to your polarisation adjusted angle. With the 4 polarisation bolts tight, check the elevation angle thus:  When you use the inclinometer the thread should dangle from the centre of the circle in the top left corner. The small circle has a cross. Thread the thread though at the exact centre and stabilise with sticky tape on the back. Expect to peak up at 29 and then if the satellite, polarisation and config are correect the RX LED with light up and the signal go up to about 92. Peak up. Best regards, Eric. ( * ) This method is applicable to legacy VSAT antennas which have a truly circular symmetic feed horn and throat. |
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« Last Edit: Jul 14th, 2011 at 2:17pm by Admin1 »
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James-BW
Senior Member
★★★ Offline Posts: 65 |
Reply #4 - Jul 16th, 2011 at 9:31am
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www.freedomsat.com a high-speed Satellite Internet solution that delivers fast and reliable internet to difficult to connect spots around the world.
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Email me: eric@satsig.net
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