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VSAT technology and installation >> HughesNet and Hughes HX VSATs >> HX50 commission issues Afghanistan https://www.satsig.net/cgi-bin/yabb/YaBB.pl?num=1258275196 Message started by revned on Nov 15th, 2009 at 8:53am |
Title: HX50 commission issues Afghanistan Post by revned on Nov 15th, 2009 at 8:53am
Hello all. I am having issues commissiong our HX50 satellite system. I have spoken to the support staff at Bentley-Walker and still can't figure out the issue, they mentioned they were having interference issues yesterday and to wait until today and still not able to commission the modem. I'm posting here to see if I can get any other suggestions to help me fix the issue and get me up and running. I have inputed the configs given to me by Bentley-Walker but the issue seems to be that the transmitter is receiving a TXcode 9 and TXcode 14. The HX50 modem shows we have a Signal strength of 88 percent. I have issued the 'rd' command in telnet to download the new firmwares but it just keeps getting stuck at 'Received RGM'. I have issued the command several times and it still shows the same thing. I have also switched the coaxial cables to verify that it is not a cable issue. My receiving end is fine and does not drop packets, but the transmit side has alot of dropped packets. Could it be a GPS issue? The coordinates we gave Bentley-Walker are of the building the satellite dish sits on and not the actual position of the satellite dish. Is it possible to manually update the modem instead of having it download through the satellite if I could get hold of the latest firmware from BW? Also, in the main screen of the modem gui, i get a diagnostic code of 0000-0000-0400-0041 Below are my config parameters and pictures.
Our Location: Bagram Airfield, Afghanistan Satellite: W6 21.6 East Lat: 34 Long: 69 Config Params Current Software Image Executing: Fallback.bin Creation Date [Release #]: Oct 17 2008, 14:23:44 [5.8.0.35] NAT Status: Disabled DHCP Server Status: Enabled on Lan1 Firewall Status: Disabled VSAT Zipcode: Not Available ======================================================================= Parameter Value entered Value in use -------------------------------------- -------------- ------------ VSAT Return Path: Inroute Inroute Satellite Longitude in degrees: 21 21 Satellite Hemisphere: East East VSAT Longitude in degrees: 69 69 VSAT Longitude in minutes: 16 16 VSAT Longitude Hemisphere: East East VSAT Latitude in degrees: 34 34 VSAT Latitude in minutes: 56 56 VSAT Latitude Hemisphere: North North Satellite Channel Frequency: 13794 (x 100Khz) 13794 (x 100Khz) Receive Symbol Rate: 7000000 Sps 7000000 Sps Receive Polarization: Vertical Vertical Transmit Polarization: Horizontal Horizontal LNB 22KHz Switch: Off Off DVB Mode: DVB-S2-ACM DVB-S2-ACM Frequency Band / Modulation: Ku / QPSK Ku / QPSK DVB Program Num for User Data: 20500 20500 DVB Program Num for DNCC Data: 40000 40000 LAN1 IP Address: 10.139.19.177 10.139.19.177 LAN1 Subnet Mask: 255.255.255.240 255.255.255.240 LAN2 IP Address: 0.0.0.0 0.0.0.0 LAN2 Subnet Mask: 0.0.0.0 0.0.0.0 IP Gateway IP Address: 192.168.12.100 192.168.12.100 SDL Control Channel Multicast Address: 224.0.1.6 224.0.1.6 VSAT Management IP Address: 13.50.2.62 13.50.2.62 Satellite Statistics Summary ------------------------------------ Network Time: MON JUN 25 18:44:43 2001 ------------------------------------ Adapter Main Statistics: ------------------------ Signal Strength.............. 89 Stream Msg-Ackd/Nakd........ 75318/1610 Flags............... 0x00020044 NonStream Msg-Ackd/Nakd..... 314/3 UpTime (d:h:m:s).. 000:02:39:30 Aloha Starts................ 0 WakeUp Aloha Starts.......... 0 Ranging Starts.............. 314 Transport Alarm Bit..... 0x0000 Frames Received............. 890539 Addresses Open............... 8 Frame Errors: CRC/Bad Key... 0/0 Carrier Info....... 021:E:13794 Miscellaneous Problems...... 34198 Rate Code........ 256k 1/2 (TC) No Receive Outroute Lock.... 15 Inroute Group................ 1 No FLL Lock................. 495 Inroute...................... 3 No Network Timing Sync...... 0 IQoS ID...................... 0 Ranging Reason: No remote-satellite ranging information (new install?) Inroute Group Selection: Ranged at inroute rate selected by IQoS Receive Status: Receiver operational. (RxCode 5) Transmit Status: Transmitter adjusting for optimal network timing. (TxCode 9) |
Title: Re: HX50 unable to commission Post by USN - Retired on Nov 15th, 2009 at 12:09pm
TX9
TX14 Rate Code 256k 1/2 (TC) Stream Msg-Ackd/Nakd........ 75318/1610 Each in their own indicate a transmit problem. Cummulatively, they suggest to me a POL angle issue. It's difficult to tell from your photos, but 1. is the "505" on the tapered waveguide adapter (behind the feedhorn) facing up relative to the feedarm? 2. can you confirm that your POL angle is at or near +47.5? 3. have you tried swapping cables? That is, move both ends of the TX cable to the receive side and both ends of the RX cable to the send side? //greg// |
Title: Re: HX50 unable to commission Post by revned on Nov 15th, 2009 at 5:35pm
Hey Greg,
At first we had the dish rotated around +46 Deg polarization, the tilt at 26 Degrees with the 505 on the horn around the 11-12 Oclock position and the LNB around the 4-5 Oclock position. That setup, we had 100 percent lock on the satellite meter and an 88 percent signal quality on the modem, but the transmiter was unable to get a lock. I was able to speak to Bentley-Walker today and they told me to reset the Dish back at 0 Degrees and to set the LNB at around 2 Oclock position. However, I couldnt get a lock at that angle and the meter's battery died on us and wont let us charge it back again. Just our luck, talk about Murphy's law. But anyway, I was able to acquire another satellite meter and just for testing, we decided to rotate the dish again to see if we can get a lock at the current settings. That was successful but now the dish polarization is at 70 Degrees with the horn 505 at 12-1 oclock and the LNB is around 3-4 Oclock position. The modem is fully functional now with a 91 percent signal lock, and the transmiter only giving 15 packet loss out of around 8000. The browsing speed and ping times to websites such as google.com vary from 800-1300ms and downloading varies from 30-40Kbytes. I guess for tomorrow's project since its around 10PM Afghanistan now, I'll see how we can tweak this further or fix the dish around. -Denver |
Title: Re: HX50 unable to commission Post by USN - Retired on Nov 15th, 2009 at 6:58pm
You may have the tapered feedhorn piece right. But just to make sure, it should be at the 12 o'clock position with respect to the feedarm. In otherwords, if you had the TRIA rotated in its cradle to 0 degrees - and the antenna bracket at 0 degrees azimuth - the 505 should be on top. Straight up.
Now you can set POL with the TRIA cradle, or with the antenna bracket. But NOT with both. If your antenna bracket has the POL angle scale on the back, that's the way to go. Set the TRIA in the cradle to 0, rotate your dish to +47.5 (clockwise from the back). If you don't have the POL scale on the antenna bracket, just set it to vertical. Then rotate the TRIA in its cradle to the +47.5 mark. //greg// |
Title: Re: HX50 unable to commission Post by Eric Johnston on Nov 15th, 2009 at 11:16pm
I agree with Greg.
The 505 should be directly away from the feed support arm. Looking at the picture there would appear to be a small error that needs correcting. Normally the filter assembly is attached to the tapered tube at one of the 90 deg positions. There are 12 holes in the flange. Looking at the picture you appear to have 30 deg error. With the LNB sticking out sideways, relative to the feed support arm, that is vertical receive polarisation starting position. Then for +47.5 deg polarisation adjustment angle turn the entire dish +47.5 deg clockwiase, as viewed facing towards the satellite. Your receive signal is already good so you are close to getting it right and once you have made the adjustment above I doubt you will see much improvement, if any. You will however reduce the interference you cause to other people's services. Regarding your problem it sounds like uplink interference to me. Someone else transmitting up to the same satellite, but wrong frequency, polarisation or transmitting spurious signals or someone on adjacent satellite with too small a dish etc. Get BW and Skylogic to help. It is a real pain when interference is intermittent, as it is from a typical TDMA VSAT uplink. Best regards, Eric. |
Title: Re: HX50 unable to commission Post by revned on Nov 17th, 2009 at 7:55am
Hello All. Thanks for suggestions. We are up and running now with a 91 percent signal strength on the modem. However, the calculations that was given to us off the calculator on this website is different. Below are the calculations given by the azel calc page and the numbers we locked on.
Given Numbers: Tilt: 25 Degrees Polarization: 46 Degrees Azimuth: 242 Numbers locked on Satellite: Tilt: 25 Degrees Polarization: 70 Degrees Azimuth: 199 Degrees Can this difference sometimes happen? Here are the stats from the transmitter range page. Network Time: TUE NOV 17 07:48:31 2009 ------------------------------------ State: Not Currently Ranging Previous Ranging Info [1] Previous Ranging Info [2] Previous Ranging Info [3] Previous Ranging Info [4] Previous Ranging Info [5] -------------------------------------------------------------------------------- Successful Rates | Unsuccessful Rates | Failed Rates | ----------------------+-----------------------+-----------------------+ 256k Turbo Code 1/2 256k Turbo Code 2/3 256k Turbo Code 4/5 -------------------------------------------------------------------------------- NOC-Sat Delay (AnE).......... 2539559 Remote-Sat Delay (BnD).... 2611626 Remote Distance To Sat (D)... 1042078 SFNP Interval............. 3600000 Ranging ID................... 16 Network Ranged On (L:H:F). 021:E:1379 NOC ID....................... 0 Ranging Record Version.... 1 -------------------------------------------------------------------------------- Rate......................... 256k Turbo Code 1/2 Available.................... 1 Ranging Reason............. 9 Ranging Sessions Required.... 5 Minimum EsNo............... 28 Target EsNo.................. 48 SwitchUp EsNo.............. 55 Initial Power Setting........ 0 Final Power Setting........ 109 Initial Received EsNo........ 79 Final Received EsNo........ 50 Initial Received C/No........ 620 Final Received C/No........ 591 Outroute SQF................. 92 Outroute C/No.............. 818 Initial Timing Offset........ 581 Final Timing Offset........ 468 Power Control Type........... PWM Estimated Rate............. No Coding Type.................. BCH Inroute Group ID Ranged.... 1 Timestamp.................... NOV 16 14:46:27 (GMT) 2009 Rate......................... 256k Turbo Code 2/3 Available.................... 1 Ranging Reason............. 0 Ranging Sessions Required.... 0 Minimum EsNo............... 54 Target EsNo.................. 64 SwitchUp EsNo.............. 0 Initial Power Setting........ 623 Final Power Setting........ 40 Initial Received EsNo........ 79 Final Received EsNo........ 64 Initial Received C/No........ 620 Final Received C/No........ 605 Outroute SQF................. 92 Outroute C/No.............. 818 Initial Timing Offset........ 0 Final Timing Offset........ 92 Power Control Type........... PWM Estimated Rate............. Yes Coding Type.................. BCH Inroute Group ID Ranged.... 1 Timestamp.................... NOV 16 14:46:28 (GMT) 2009 Rate......................... 256k Turbo Code 4/5 Available.................... 1 Ranging Reason............. 0 Ranging Sessions Required.... 0 Minimum EsNo............... 77 Target EsNo.................. 87 SwitchUp EsNo.............. 0 Initial Power Setting........ 623 Final Power Setting........ 0 Initial Received EsNo........ 79 Final Received EsNo........ 79 Initial Received C/No........ 620 Final Received C/No........ 620 Outroute SQF................. 92 Outroute C/No.............. 818 Initial Timing Offset........ 0 Final Timing Offset........ 92 Power Control Type........... PWM Estimated Rate............. Yes Coding Type.................. BCH Inroute Group ID Ranged.... 1 Timestamp.................... NOV 16 14:46:28 (GMT) 2009 -Denver |
Title: Re: HX50 successfully commissioned Post by Eric Johnston on Nov 17th, 2009 at 10:33am
I am pleased to hear you have it working OK. Well done.
Quote:
The beam elevation angle (tilt) is the slope of the large circular polarisation scale plate behind the dish. You may apply an inclinometer to the side of this scale plate. The image below shows the beam elevation angle set to 48 deg. The metal plate behind the dish is at right angles to the beam direction. You can make your own inclinometer like this by printing out page: How to make inclinometer I would have expected the final polarisation to be about 50 deg, based on 46.7 calculated plus a possible 3.5 deg Eutelsat satellite offset. This assumes the 505 directly away from the feed support arm and the LNB arm was sticking out sideways initially (for vertical name receive polarisation), when the feed support arm was at the bottom central position. Adjusted polarisations do vary from the calculation and this is why the hub usually asks you to make an adjustment while they look at your cross-pol signal on their spectrum analyser. I can't explain a large difference of 20 deg. My calculated magnetic compass azimuth angle is based on calculation plus an approximation of the earth's magnetic field. Errors are normally under 5 deg. Local compass measurments may also be in error due to iron in buildings and structures plus local magnetic anomalies depending on the geology. The dish pointing maps (eg: dish pointing afghanistan) now include a blue line showing the azimuth direction. This is helpful as the blue line may be related to the direction of the sides of your roof, building, road, runway (210 magnetic for Bagram) or whatever landmark may be visible in the aerial photo. I can't explain a large difference of 40 deg. Best regards, Eric. |
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