No channels working in the Telecom/High band

[GAH]

Hi ,
Thanks to the help I received from essu and tmbinc, my receiver is up and running. However, I still have my original problem, which is that I can't receive many channels. At first I thought I was getting no channels at all, but the problem is that I am not getting any channels broadcasting in the Telecom band. On Astra, this means that I get almost no channels at all, hence my original thought. I have also flashed my box back to Neutrino, and had the exact same problem, so I assume it is a problem with linux possibly. When I do a manual channel scan, I get a good signal on the signal bars (SNR and AGC), but no channels are found. My dbox loops through to my Pace500 (via the analogue reciever LNB socket on the back) to move my dish, and I have no problem picking up channels in the Telecom band in analogue.

Can ayone help me ?

Regards,
GAH

[GAH]

Hi,

I've noticed that if I go into the LNB settings in Satellites, and change the theshold from 11.700 to 11.900 or 12.750, I can get a lot more channels. I don't know if that makes it any easier to diagnose my fault.

Regards,
GAH

[tmbinc]

Hi,

I don't know what "Telecom"-Band is (sorry), but it sounds EXACTLY like the signal for switching into the high-band (22khz tone) doesn't work.

on astra, there a only very few transponders in the lowband -> thus you won't get many channels.

(FYI: all frequencies above the threshold-frequency are accessed using the "higher" band (LOF 10600), all below using the "lower" band (LOF 9750). The LOF is basically the value where the frequency spectrum is mirrored, so with LOF of 10600, a frequency of 12600 becomes 2000 (12600-10600))

if you know put the threshold to a higher frequency, enigma tries to access all channels using the lower band. the LNB will convert down by 97500, so all "highband" channels will be (10600-97500 =) 850MHz higher than normally. Actually, all channels are accessible even with one band only, BUT .. and here comes the problem, the cables / LNB / tuner work only up to ~2GHz. So with a higher threshold, the "upper" channels will have a bad SNR or aren't accessible at all. This is the reason they invented band-switching.

so, in your case:

it looks like the 22KHz-signal (used to switch the LNB from lo to hi band) doesn't make it. The reasons could be:
- Your LNB is not a dualband-LNB (i.e., not "digital" / no "universal")
- your other receiver removes the 22khz (very likely)

try connecting the box directly to the LNB - does it work then?

another, not very likely cause, could be:
- you have a Diseqc-LNB (which doesn't use 22khz, or at least with less priority than the diseqc signal), and the dbox generates invalid diseqc sequences.

however, i don't think thats the problem here.

[GAH]

Hi tmbinc,

Thanks for your advice. It was indeed my analogue receiver which was causing the problem. I assumed that because there was an LNB loopthrough on the Dbox2 for an analogue receiver, there would be no problem using it. However, the analogue box was preventing the LNB from switching to the higher band. I am now not sure how to connect my analogue receiver into my system, but at least my Dbox2 is now working.

Many thanks,
GAH