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Autor Thema: Very low signal on dreambox 800SE  (Gelesen 20021 mal)

Roygenz

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Very low signal on dreambox 800SE
« am: Mai 21, 2012, 07:47:00 Nachmittag »
Hello,

I recently installed the sundtek skytv ultimate III (DVB-S2) tuner on my dreambox 800SE (running newnigma 3.2.2). The tuner works, but i have a very low signal strength on the usb tuner (around 4%). As a result of that i get many "error reading PAT"  or "tune failed" messages. Recordings are are also failed many times.

On the internal dreambox tuner i get around 75% (13dB) signal strength. The distance between the dreambox & the dish is approx 40m. Is this distance too long for the usb tuner? Should i use an amplifier between the lnb & usb tuner?

I'm watching astra 19,2 & 23,5.

Thanks for the advice!
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Re:Very low signal on dreambox 800SE
« Antwort #1 am: Mai 22, 2012, 06:43:00 Vormittag »
I think the signal strength which is indicated on enigma2 is the wrong one.

If you run following command on the console you get the correct one:

Zitat
/opt/bin/mediaclient --readsignal=20 -d /dev/dvb/adapter1/frontend0

Can you run that command via telnet?

However we'll check the E2 entries within the next days as more customers are wondering because of the low signal strength indicator.

Are you also using the latest driver from our website?  If possible contact us via chat http://chat.sundtek.de or Skype: sundtek to check what's going on on your side (and if it's really the 40m cable)
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Roygenz

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Re:Very low signal on dreambox 800SE
« Antwort #2 am: Mai 22, 2012, 09:04:28 Vormittag »
Hello,

This is the output: It seems good i think?

Zitat
root@dm800:~# /opt/bin/mediaclient --readsignal=20 -d /dev/dvb/adapter1/frontend0
== reading digital TV signal ==
SIGNAL: [.............................    ] ( 87%)  BER:  34608 FREQ: 1587500    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_5_6 VOLTAGE: H(18V) TONE: ON
SIGNAL: [.............................    ] ( 87%)  BER:  34608 FREQ: 1587500    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_5_6 VOLTAGE: H(18V) TONE: ON
SIGNAL: [.............................    ] ( 87%)  BER:      0 FREQ: 1587500    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_5_6 VOLTAGE: H(18V) TONE: ON
SIGNAL: [.............................    ] ( 87%)  BER:      0 FREQ: 1587500    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_5_6 VOLTAGE: H(18V) TONE: ON
SIGNAL: [.............................    ] ( 87%)  BER:      0 FREQ: 1587500    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_5_6 VOLTAGE: H(18V) TONE: ON
SIGNAL: [.............................    ] ( 87%)  BER:      0 FREQ: 1587500    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_5_6 VOLTAGE: H(18V) TONE: ON
SIGNAL: [.............................    ] ( 87%)  BER:      0 FREQ: 1587500    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_5_6 VOLTAGE: H(18V) TONE: ON
SIGNAL: [.............................    ] ( 87%)  BER:      0 FREQ: 1587500    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_5_6 VOLTAGE: H(18V) TONE: ON
SIGNAL: [.............................    ] ( 87%)  BER:      0 FREQ: 1587500    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_5_6 VOLTAGE: H(18V) TONE: ON
SIGNAL: [.............................    ] ( 87%)  BER:      0 FREQ: 1587500    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_5_6 VOLTAGE: H(18V) TONE: ON
SIGNAL: [.............................    ] ( 87%)  BER:      0 FREQ: 1587500    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_5_6 VOLTAGE: H(18V) TONE: ON
SIGNAL: [.............................    ] ( 87%)  BER:      0 FREQ: 1587500    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_5_6 VOLTAGE: H(18V) TONE: ON
SIGNAL: [.............................    ] ( 87%)  BER:      0 FREQ: 1587500    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_5_6 VOLTAGE: H(18V) TONE: ON
SIGNAL: [.............................    ] ( 87%)  BER:      0 FREQ: 1587500    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_5_6 VOLTAGE: H(18V) TONE: ON
SIGNAL: [.............................    ] ( 87%)  BER:      0 FREQ: 1587500    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_5_6 VOLTAGE: H(18V) TONE: ON
SIGNAL: [.............................    ] ( 88%)  BER:      0 FREQ: 1587500    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_5_6 VOLTAGE: H(18V) TONE: ON
SIGNAL: [.............................    ] ( 88%)  BER:      0 FREQ: 1587500    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_5_6 VOLTAGE: H(18V) TONE: ON
SIGNAL: [.............................    ] ( 88%)  BER:      0 FREQ: 1587500    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_5_6 VOLTAGE: H(18V) TONE: ON
SIGNAL: [.............................    ] ( 88%)  BER:      0 FREQ: 1587500    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_5_6 VOLTAGE: H(18V) TONE: ON
SIGNAL: [.............................    ] ( 88%)  BER:      0 FREQ: 1587500    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_5_6 VOLTAGE: H(18V) TONE: ON

Channels on vertical polarisation (13V) are tuning slower (and giving more error messages):

Zitat
== reading digital TV signal ==
SIGNAL: [.............................    ] ( 88%)  BER:  10612 FREQ: 1529000    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_2_3 VOLTAGE: V(13V) TONE: ON
SIGNAL: [.............................    ] ( 88%)  BER:  10612 FREQ: 1529000    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_2_3 VOLTAGE: V(13V) TONE: ON
SIGNAL: [.............................    ] ( 87%)  BER:      0 FREQ: 1529000    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_2_3 VOLTAGE: V(13V) TONE: ON
SIGNAL: [.............................    ] ( 87%)  BER:      0 FREQ: 1529000    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_2_3 VOLTAGE: V(13V) TONE: ON
SIGNAL: [.............................    ] ( 87%)  BER:      0 FREQ: 1529000    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_2_3 VOLTAGE: V(13V) TONE: ON
SIGNAL: [.............................    ] ( 87%)  BER:      0 FREQ: 1529000    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_2_3 VOLTAGE: V(13V) TONE: ON
SIGNAL: [.............................    ] ( 87%)  BER:      0 FREQ: 1529000    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_2_3 VOLTAGE: V(13V) TONE: ON
SIGNAL: [............................     ] ( 86%)  BER:      0 FREQ: 1529000    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_2_3 VOLTAGE: V(13V) TONE: ON
SIGNAL: [............................     ] ( 86%)  BER:      0 FREQ: 1529000    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_2_3 VOLTAGE: V(13V) TONE: ON
SIGNAL: [............................     ] ( 86%)  BER:      0 FREQ: 1529000    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_2_3 VOLTAGE: V(13V) TONE: ON
SIGNAL: [............................     ] ( 86%)  BER:      0 FREQ: 1529000    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_2_3 VOLTAGE: V(13V) TONE: ON
SIGNAL: [............................     ] ( 85%)  BER:      0 FREQ: 1529000    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_2_3 VOLTAGE: V(13V) TONE: ON
SIGNAL: [............................     ] ( 85%)  BER:      0 FREQ: 1529000    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_2_3 VOLTAGE: V(13V) TONE: ON
SIGNAL: [............................     ] ( 85%)  BER:      0 FREQ: 1529000    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_2_3 VOLTAGE: V(13V) TONE: ON
SIGNAL: [............................     ] ( 85%)  BER:      0 FREQ: 1529000    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_2_3 VOLTAGE: V(13V) TONE: ON
SIGNAL: [............................     ] ( 85%)  BER:      0 FREQ: 1529000    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_2_3 VOLTAGE: V(13V) TONE: ON
SIGNAL: [............................     ] ( 85%)  BER:      0 FREQ: 1529000    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_2_3 VOLTAGE: V(13V) TONE: ON
SIGNAL: [............................     ] ( 85%)  BER:      0 FREQ: 1529000    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_2_3 VOLTAGE: V(13V) TONE: ON
SIGNAL: [............................     ] ( 85%)  BER:      0 FREQ: 1529000    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_2_3 VOLTAGE: V(13V) TONE: ON
SIGNAL: [............................     ] ( 85%)  BER:      0 FREQ: 1529000    Hz LOCKED: YES SYS: DVB-S2 SYM: 27500000 FEC: FEC_2_3 VOLTAGE: V(13V) TONE: ON

Is is possible that enigma is tuning slow & giving the error reading PAT messages because the wrong signal reading?

Thanks for your help!

The driver is up to date (i did the update yesterday)
« Letzte Änderung: Mai 22, 2012, 09:39:00 Vormittag von Roygenz »
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Re:Very low signal on dreambox 800SE
« Antwort #3 am: Mai 22, 2012, 11:45:17 Vormittag »
Maybe because of slow tuning.

Can you double-check if only DVB-S2 is affected on your side?
Do you have the same issue with DVB-S?

The signal looks good enough
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Re:Very low signal on dreambox 800SE
« Antwort #4 am: Mai 22, 2012, 02:50:13 Nachmittag »
This is the result with DVB-S:

Zitat
== reading digital TV signal ==
SIGNAL: [............................     ] ( 86%)  BER:      0 FREQ: 1236000    Hz LOCKED: YES SYS: DVB-S SYM: 27500000 FEC: FEC_AUTO VOLTAGE: H(18V) TONE: ON
SIGNAL: [............................     ] ( 86%)  BER:      0 FREQ: 1236000    Hz LOCKED: YES SYS: DVB-S SYM: 27500000 FEC: FEC_AUTO VOLTAGE: H(18V) TONE: ON
SIGNAL: [............................     ] ( 86%)  BER:      0 FREQ: 1236000    Hz LOCKED: YES SYS: DVB-S SYM: 27500000 FEC: FEC_AUTO VOLTAGE: H(18V) TONE: ON
SIGNAL: [............................     ] ( 86%)  BER:      0 FREQ: 1236000    Hz LOCKED: YES SYS: DVB-S SYM: 27500000 FEC: FEC_AUTO VOLTAGE: H(18V) TONE: ON
SIGNAL: [............................     ] ( 86%)  BER:      0 FREQ: 1236000    Hz LOCKED: YES SYS: DVB-S SYM: 27500000 FEC: FEC_AUTO VOLTAGE: H(18V) TONE: ON
SIGNAL: [............................     ] ( 86%)  BER:      0 FREQ: 1236000    Hz LOCKED: YES SYS: DVB-S SYM: 27500000 FEC: FEC_AUTO VOLTAGE: H(18V) TONE: ON
SIGNAL: [............................     ] ( 86%)  BER:      0 FREQ: 1236000    Hz LOCKED: YES SYS: DVB-S SYM: 27500000 FEC: FEC_AUTO VOLTAGE: H(18V) TONE: ON
SIGNAL: [............................     ] ( 86%)  BER:      0 FREQ: 1236000    Hz LOCKED: YES SYS: DVB-S SYM: 27500000 FEC: FEC_AUTO VOLTAGE: H(18V) TONE: ON
SIGNAL: [............................     ] ( 86%)  BER:      0 FREQ: 1236000    Hz LOCKED: YES SYS: DVB-S SYM: 27500000 FEC: FEC_AUTO VOLTAGE: H(18V) TONE: ON
SIGNAL: [............................     ] ( 86%)  BER:      0 FREQ: 1236000    Hz LOCKED: YES SYS: DVB-S SYM: 27500000 FEC: FEC_AUTO VOLTAGE: H(18V) TONE: ON
SIGNAL: [............................     ] ( 86%)  BER:      0 FREQ: 1236000    Hz LOCKED: YES SYS: DVB-S SYM: 27500000 FEC: FEC_AUTO VOLTAGE: H(18V) TONE: ON
SIGNAL: [............................     ] ( 86%)  BER:      0 FREQ: 1236000    Hz LOCKED: YES SYS: DVB-S SYM: 27500000 FEC: FEC_AUTO VOLTAGE: H(18V) TONE: ON
SIGNAL: [............................     ] ( 86%)  BER:      0 FREQ: 1236000    Hz LOCKED: YES SYS: DVB-S SYM: 27500000 FEC: FEC_AUTO VOLTAGE: H(18V) TONE: ON
SIGNAL: [............................     ] ( 86%)  BER:      0 FREQ: 1236000    Hz LOCKED: YES SYS: DVB-S SYM: 27500000 FEC: FEC_AUTO VOLTAGE: H(18V) TONE: ON
SIGNAL: [............................     ] ( 86%)  BER:      0 FREQ: 1236000    Hz LOCKED: YES SYS: DVB-S SYM: 27500000 FEC: FEC_AUTO VOLTAGE: H(18V) TONE: ON
SIGNAL: [............................     ] ( 86%)  BER:      0 FREQ: 1236000    Hz LOCKED: YES SYS: DVB-S SYM: 27500000 FEC: FEC_AUTO VOLTAGE: H(18V) TONE: ON
SIGNAL: [............................     ] ( 86%)  BER:      0 FREQ: 1236000    Hz LOCKED: YES SYS: DVB-S SYM: 27500000 FEC: FEC_AUTO VOLTAGE: H(18V) TONE: ON
SIGNAL: [............................     ] ( 86%)  BER:      0 FREQ: 1236000    Hz LOCKED: YES SYS: DVB-S SYM: 27500000 FEC: FEC_AUTO VOLTAGE: H(18V) TONE: ON
SIGNAL: [............................     ] ( 86%)  BER:      0 FREQ: 1236000    Hz LOCKED: YES SYS: DVB-S SYM: 27500000 FEC: FEC_AUTO VOLTAGE: H(18V) TONE: ON
SIGNAL: [............................     ] ( 86%)  BER:      0 FREQ: 1236000    Hz LOCKED: YES SYS: DVB-S SYM: 27500000 FEC: FEC_AUTO VOLTAGE: H(18V) TONE: ON

what I notice (on DVB-S2) is that tuning in to V polarisation is going less smoothly than tune in to H polarisation. Even recordings on H are going a lot better than on V polarisation for some reason.

Tuning in to SD channels is going also a lot better than HD channels. Watching or recording HD channels with the usbtuner make the dreambox very slow (i can't zap or change the volume due the "spinner" i get on the screen)


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Re:Very low signal on dreambox 800SE
« Antwort #5 am: Mai 22, 2012, 05:54:31 Nachmittag »
Can you tell us your setup?
- Which LNB do you have?
- Do you use any Multiswitch?

I think this is something for our Lab, 40M cable.

By the way can you turn off the indicators in the sensorbar (this is a serious thing which influences the zapping speed and timeouts)? Reading the signal strength costs a lot time and might cause your problem.
The low signal strength indicator is definitely a software issue (wrong scale only) but nothing to worry about in your case.
« Letzte Änderung: Mai 22, 2012, 05:56:21 Nachmittag von Sundtek »
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Re:Very low signal on dreambox 800SE
« Antwort #6 am: Mai 22, 2012, 08:07:09 Nachmittag »
I use an "duo-lnb" from canaldigitaal (lnb with diseqcswitch build in) on astra 19.2 & 23.5. I don't have other switches.

Maybe a stupid question, but how do i turn off those indicators in the sensorbar?
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Re:Very low signal on dreambox 800SE
« Antwort #7 am: Mai 23, 2012, 06:02:30 Vormittag »
Another question after talking with the hardware and software engineer.

We currently do not have any delay after setting from 13 to 18V, so when tuning to early it might cause bad signal for some short time and require to retune.

So can you check a few things:

Zapping between H - H (18V transponders)
Zapping between V - V (13V transponders)
Zapping between V - H (13V - 18V transponders)
Zapping between H - V (18V - 13V transponders)

The problem in our Lab is as usual hard to reproduce without having the customers equipment, so some LNBs out there might require some driver tweaks based on the timing. We think there are 2 things that can be improved for you.
1. Sensorfield (I will get back to you later about that)
2. just adding some small delay (few milliseconds) between LNB Voltage change

Can you do those tests and leave following command running in the background:

Zitat
/opt/bin/mediaclient --readsignal=0 -d /dev/dvb/adapter1/frontend0

please send the output to kontakt at sundtek de
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Re:Very low signal on dreambox 800SE
« Antwort #8 am: Mai 23, 2012, 09:39:45 Vormittag »
Ok, thanks!
The problem occures indeed many times when zapping from H to V position, and mostly when i watch or record a hd channel with the internal tuner.

I test this asap, thanks for your help!
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