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Zero signal strength
PostPosted: Sat Jul 22, 2006 5:41 pm Reply with quote
cgonzo
 
Joined: 22 Jul 2006
Posts: 2




Using ubuntu 6.06 and kernel 4.6.18rc2 with the 5500 drivers built in (these do work, right?). I believe my software setup is working, as the card is definitely being seen and communicated with. The problem is that using azap I get zero signal strength, although I do get signal lock. I can scan through channels and only get lock on channels that antennaweb says are broadcasting in this area, but the strength is always zero.

dtvsignal always says signal strength is zero; atscscan output is:
atscscan V1.32 Copyright (C) 2006 Trent Piepho <xyzzy@speakeasy.org>
Linux DVB based ATSC OTA/Cable channel scanning tool
Using DVB adapter #0
Verbose output turned on
Using OTA US Broadcast frequencies w/ 8-VSB
Using front-end: LG Electronics LGDT3303 VSB/QAM Frontend
Tuner range 54 MHz to 858 MHz, 62500 Hz stepsize
Front-end capabilities:
VSB-8
QAM-64
QAM-256
Tuning to channel 23 (527.0000 MHz): # LOCK Strength = 0.0%
LOCK Strength = 0.0%
LOCK Strength = 0.0%
LOCK Strength = 0.0%
LOCK Strength = 0.0%
LOCK Strength = 0.0%
LOCK Strength = 0.0%
Unable to tune channel

channels.conf consists of one line:
KOCE:677000000:8VSB:49:52

azap output is:
cgonzo@gonzo:~$ azap -r KOCE
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
tuning to 677000000 Hz
video pid 0x0031, audio pid 0x0034
status 00 | signal 0000 | snr 0000 | ber 00000000 | unc 00000000 |
status 1f | signal 0000 | snr ff58 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
status 1f | signal 0000 | snr ffb4 | ber 00000000 | unc 0000003c | FE_HAS_LOCK
status 1f | signal 0000 | snr ffb4 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
status 1f | signal 0000 | snr ffa3 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
status 1f | signal 0000 | snr ffa7 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
status 1f | signal 0000 | snr ffac | ber 00000000 | unc 00000000 | FE_HAS_LOCK

dtvbtraffic output while this is running is:
-PID--FREQ-----BANDWIDTH-BANDWIDTH-
0000 20 p/s 3 kb/s 31 kbit
0010 0 p/s 0 kb/s 1 kbit
0030 20 p/s 3 kb/s 31 kbit
0031 8507 p/s 1561 kb/s 12795 kbit
0034 130 p/s 23 kb/s 196 kbit
0040 20 p/s 3 kb/s 31 kbit
0041 2339 p/s 429 kb/s 3519 kbit
0044 131 p/s 24 kb/s 197 kbit
0050 20 p/s 3 kb/s 31 kbit
0051 1049 p/s 192 kb/s 1578 kbit
0054 130 p/s 23 kb/s 196 kbit
1d00 25 p/s 4 kb/s 38 kbit
1d01 5 p/s 0 kb/s 8 kbit
1d02 10 p/s 1 kb/s 16 kbit
1d04 7 p/s 1 kb/s 11 kbit
1d05 4 p/s 0 kb/s 7 kbit
1d07 11 p/s 2 kb/s 17 kbit
1e00 79 p/s 14 kb/s 118 kbit
1e01 14 p/s 2 kb/s 22 kbit
1e02 14 p/s 2 kb/s 22 kbit
1e03 24 p/s 4 kb/s 37 kbit
1e04 21 p/s 3 kb/s 32 kbit
1e05 20 p/s 3 kb/s 31 kbit
1e06 12 p/s 2 kb/s 19 kbit
1e07 14 p/s 2 kb/s 22 kbit
1e80 3 p/s 0 kb/s 5 kbit
1ffb 20 p/s 3 kb/s 31 kbit
1fff 232 p/s 42 kb/s 349 kbit
2000 12901 p/s 2368 kb/s 19403 kbit
-PID--FREQ-----BANDWIDTH-BANDWIDTH-

I replaced the antenna and that didn't accomplish anything else. It looks like there is a signal coming off the board, but everything reports a signal strength of zero. I'm completely out of ideas. Suggestions?
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PostPosted: Sat Jul 22, 2006 9:34 pm Reply with quote
xyzzy
 
Joined: 12 Feb 2006
Posts: 225




I think that the kernel drivers for the HD-5500 don't support reading signal strength or SNR correctly. That's one of the things the drivers from pcHDTV have added.
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PostPosted: Sun Jul 23, 2006 12:00 pm Reply with quote
cgonzo
 
Joined: 22 Jul 2006
Posts: 2




Well, that certainly changes everything! Now that I'm ignoring signal strength, capturing to a file and playing in mplayer works fine, so I guess the card works after all

cheers!
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Zero signal strength
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