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https://www.satsig.net/cgi-bin/yabb/YaBB.pl VSAT technology and installation >> iDirect Forum: hubs and terminals >> Strange RX Lock Issues https://www.satsig.net/cgi-bin/yabb/YaBB.pl?num=1266827315 Message started by alexashinze on Feb 22^nd, 2010 at 8:28am

Title: Strange RX Lock Issues
Post by alexashinze on Feb 22^nd, 2010 at 8:28am

Hello Professional Colleagues,
Here is a major issue I am having with option files. My ISP send me an option file for NSS10. I cannot get an RX lock with it. Now with same modem and another option file sent to me by another ISP for same satellite, I get a lock. I have received 5 different option files from same ISP and no RX lock. I load other NSS10 Option files I have and I get RX lock on a fly. The dish has been pointed to Nss10 and has been working there for a while.
Any solution to this kind of challenge.

Title: Re: Strange RX Lock Issues
Post by Eric Johnston on Feb 22^nd, 2010 at 8:47am

Have a look at the options files and see what is different. They may have different frequencies, symbol rates, coding, tuning acquisition range, LNB switched on or off etc.

I am not sure about this next bit, but here is an idea..

If they appear identical, check that there are no spurious non printing characters at the end after the last visible character.

Select the text only, cut and paste to a new text file. �You must make the select include the last visible character exactly with no line feeds etc included after the end (I think!).

Best regards, Eric.

Title: Re: Strange RX Lock Issues
Post by alexashinze on Feb 22^nd, 2010 at 8:57am

Hello Thanks. Can I paste the opf from both ISPs so you can help me look cos I have read thru again and again. As a fact, I have sent the NOC both option files for them to compare and make modifications to theirs, but still we have not made any headway.
Thanks Eric

Title: Re: Strange RX Lock Issues
Post by Eric Johnston on Feb 22^nd, 2010 at 10:26am

You may send them as email attachments to me eric@satsig.net

If you paste them here in the forum, I suggest you delete the IP addresses and any passwords.

Best regards, Eric

Title: Re: Strange RX Lock Issues
Post by TDMAMike on Feb 22^nd, 2010 at 11:23am

Questions:

1. Is the spectrum (downstream carrier center freq)utilized in both options files on the same POL (rx)?
2. Is voltage (DC) enabled ( =1) on both options files?
3. What is the rx bit rate specified in the 1st options file? 2nd options file?
4. What type of LNB are you using? PLL or DRO?

Title: Re: Strange RX Lock Issues
Post by takinolaa on Mar 17^th, 2010 at 11:18am

Have you check the frequencies, symbol rates, type of LNB (PLL or DRO), and the options file sent to you by your provider? If yes and you confirm they are all Ok. I will advice you to increase acquisition range.

l have encounter the same problem, but when l increase the acquisition range l got the rlock.

Regards,

Akinola
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