Re: [linux-dvb] Please see if you can help: Twinhan VP 1025 DVB-S PCICard
I suppose it could be a weak signal. I am using an inline signal meter to aim the dish and it shows a signal. How about polarization? It turns out this LNB is Circular only (thank you Steven Toth). How do I get dvbtune or other szap to use circular (L or R) polarity? Is this supported in v4l-dvb? I don't fully understand the real electrical/RF implications of circular left/right vs linear horizontal/vertical other than to say that it's related to how the signal is sent (polarised) from the satellite (it's polarisation) and that you have to have a matching LNB of the same polarisation. In some cases I've been able to receive circular right with a H/V LNB but that was a rare exception, circular left never worked. I'd say buy a linear H/V LNB if your goals are to tune to H/V feeds. I'm not suggesting this is your only issue but it's certainly one of the most important. If you have access to a spectrum analyzer when you could see very quickly the L-band representation to see whether the LNB is down-converting correctly, or whether you have a tuner related issue. Steve ___ linux-dvb mailing list linux-dvb@linuxtv.org http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
Re: [linux-dvb] Please see if you can help: Twinhan VP 1025 DVB-S PCICard
I don't fully understand the real electrical/RF implications of circular left/right vs linear horizontal/vertical other than to say that it's related to how the signal is sent (polarised) from the satellite (it's polarisation) and that you have to have a matching LNB of the same polarisation. In some cases I've been able to receive circular right with a H/V LNB but that was a rare exception, circular left never worked. I'd say buy a linear H/V LNB if your goals are to tune to H/V feeds. I'm not suggesting this is your only issue but it's certainly one of the most important. If you have access to a spectrum analyzer when you could see very quickly the L-band representation to see whether the LNB is down-converting correctly, or whether you have a tuner related issue. Steve Thanks, Steve. I was getting confused because it appears that even if you specify R or L in channels.conf file, the response from szap still only shows V or H. Other documentation that I found says that circular right is activated on the LNB with 13 volts, the same as linear vertical would be activated. Circular left is activated with 18 volts the same way linear horizontal would be. Does that sound correct? I am now starting to think that possibly the signal I'm trying to tune to is too weak. I am only using a small 18 inch DirecTV dish. Any insights on this? Thanks much. David ___ linux-dvb mailing list linux-dvb@linuxtv.org http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
Re: [linux-dvb] Please see if you can help: Twinhan VP 1025 DVB-S PCICard
I would REALLY apprecate any help or insght you might have on this. thank you very much for your consideration. What oscillator values does your LNB use? The last time I tried to use dvbtune in the US I had to change the hard coded defines from 9.750 / 10.6 GHz to match my US specific LNB (usually 10.6 for both high and low, could be 10.750 or 11.250), then recompile etc. The LNB converts 10-12GHz signals down into l-band 1-2 GHz. The tuner on the card technically tunes to l-band. That should match the number you're seeing. Check your LNB and make sure the dvbtune defines match those values. Steve I just added to dvbstrean from cvs the options -SL, -L1 and -L2 (all must be divided by 1000, e.g. -SL 9750) to permit the user to specify the LOFs, defaulted to the universal LNB ones. Notice that setting sensible values is user's responsability , so don't expect any check by dvbstream. ___ linux-dvb mailing list linux-dvb@linuxtv.org http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
Re: [linux-dvb] Please see if you can help: Twinhan VP 1025 DVB-S PCICard
I would REALLY apprecate any help or insght you might have on this. thank you very much for your consideration. What oscillator values does your LNB use? The last time I tried to use dvbtune in the US I had to change the hard coded defines from 9.750 / 10.6 GHz to match my US specific LNB (usually 10.6 for both high and low, could be 10.750 or 11.250), then recompile etc. The LNB converts 10-12GHz signals down into l-band 1-2 GHz. The tuner on the card technically tunes to l-band. That should match the number you're seeing. Check your LNB and make sure the dvbtune defines match those values. Steve ___ linux-dvb mailing list linux-dvb@linuxtv.org http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
Re: [linux-dvb] Please see if you can help: Twinhan VP 1025 DVB-S PCICard
Thanks for your reply, Unfortunately I dont know much about the LNB. I went and remove it from the dish but the identification sticker has worn away. It came from a common 18 inch DirecTV dish. there are two LNB's in there, I think, because there are two coax outs. I'm only using one at the moment because I dont have a disecq. Do you thnk this LNB w]ll cause my defines in dvbtune.c to need changing? Best, Dave Schile From: Steven Toth [EMAIL PROTECTED] To: Dave Schile [EMAIL PROTECTED] CC: linux-dvb@linuxtv.org linux-dvb@linuxtv.org Subject: Re: [linux-dvb] Please see if you can help: Twinhan VP 1025 DVB-S PCICard Date: Sun, 13 Aug 2006 20:34:26 -0400 MIME-Version: 1.0 Received: from mta2.srv.hcvlny.cv.net ([167.206.4.197]) by bay0-mc3-f9.bay0.hotmail.com with Microsoft SMTPSVC(6.0.3790.2444); Sun, 13 Aug 2006 17:35:42 -0700 Received: from [192.168.0.104] (ool-18bac60f.dyn.optonline.net [24.186.198.15]) by mta2.srv.hcvlny.cv.net (Sun Java System Messaging Server 6.2-6.01 (built Apr 3 2006)) with ESMTP id [EMAIL PROTECTED] for [EMAIL PROTECTED]; Sun, 13 Aug 2006 20:35:42 -0400 (EDT) X-Message-Info: LsUYwwHHNt3660MmjhEvYg2f34OAemlKtU9j2Z7TuGo= References: [EMAIL PROTECTED] User-Agent: Thunderbird 1.5.0.5 (Macintosh/20060719) Return-Path: [EMAIL PROTECTED] X-OriginalArrivalTime: 14 Aug 2006 00:35:43.0005 (UTC) FILETIME=[932F9CD0:01C6BF39] I would REALLY apprecate any help or insght you might have on this. thank you very much for your consideration. What oscillator values does your LNB use? The last time I tried to use dvbtune in the US I had to change the hard coded defines from 9.750 / 10.6 GHz to match my US specific LNB (usually 10.6 for both high and low, could be 10.750 or 11.250), then recompile etc. The LNB converts 10-12GHz signals down into l-band 1-2 GHz. The tuner on the card technically tunes to l-band. That should match the number you're seeing. Check your LNB and make sure the dvbtune defines match those values. Steve ___ linux-dvb mailing list linux-dvb@linuxtv.org http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
