[linux-dvb] mt2060 / compro u500 can't tune

Simon Bowden simon at bowdens.id.au
Sat Apr 21 17:51:37 CEST 2007


Hi All,

I've got a Compro U500, which is a USB DVB-T stick, based on  dib7700
with mt2060 frontend.

However, I can't seem to change channels. It is tuned to one channel
(which was probably the last one it was on under MS windows), and MythTV
always says "No lock" for other ones. Could I be missing something?

I wonder if it could be related to this earlier thread about eeprom data:

http://www.linuxtv.org/pipermail/linux-dvb/2006-December/014926.html

The following is the debug=1 information from the MT2060 driver across
three attempted channel changes. The final one is tuning to the "active"
channel (the only one that works - I suspect it simply never changes).

=====================
Apr 22 01:16:56 harmony MT2060: successfully identified (IF1 = 1220)
Apr 22 01:16:56 harmony MT2060: calibration was successful: 129
Apr 22 01:16:56 harmony dvb-usb: Compro Videomate U500 successfully
initialized and connected.
Apr 22 01:20:11 harmony MT2060: IF1: 1220MHz
Apr 22 01:20:11 harmony MT2060: PLL freq=219500kHz  f_lo1=1439500kHz 
f_lo2=1183850kHz
Apr 22 01:20:11 harmony MT2060: PLL div1=89  num1=62  div2=73  num2=8115
Apr 22 01:20:11 harmony MT2060: PLL [1..5]: 9f 59 23 fb 93
Apr 22 01:27:50 harmony MT2060: IF1: 1220MHz
Apr 22 01:27:50 harmony MT2060: PLL freq=177500kHz  f_lo1=1397500kHz 
f_lo2=1183850kHz
Apr 22 01:27:50 harmony MT2060: PLL div1=87  num1=22  div2=73  num2=8115
Apr 22 01:27:50 harmony MT2060: PLL [1..5]: a5 57 23 fb 93
Apr 22 01:27:52 harmony MT2060: IF1: 1220MHz
Apr 22 01:27:52 harmony MT2060: PLL freq=177500kHz  f_lo1=1397500kHz 
f_lo2=1183850kHz
Apr 22 01:27:52 harmony MT2060: PLL div1=87  num1=22  div2=73  num2=8115
Apr 22 01:27:52 harmony MT2060: PLL [1..5]: a5 57 23 fb 93
Apr 22 01:27:53 harmony MT2060: IF1: 1220MHz
Apr 22 01:27:53 harmony MT2060: PLL freq=177500kHz  f_lo1=1397500kHz 
f_lo2=1183850kHz
Apr 22 01:27:53 harmony MT2060: PLL div1=87  num1=22  div2=73  num2=8115
Apr 22 01:27:53 harmony MT2060: PLL [1..5]: a5 57 23 fb 93
Apr 22 01:27:54 harmony MT2060: IF1: 1220MHz
Apr 22 01:27:54 harmony MT2060: PLL freq=177500kHz  f_lo1=1397500kHz 
f_lo2=1183850kHz
Apr 22 01:27:54 harmony MT2060: PLL div1=87  num1=22  div2=73  num2=8115
Apr 22 01:27:54 harmony MT2060: PLL [1..5]: a5 57 23 fb 93
Apr 22 01:27:56 harmony MT2060: IF1: 1220MHz
Apr 22 01:27:56 harmony MT2060: PLL freq=177500kHz  f_lo1=1397500kHz 
f_lo2=1183850kHz
Apr 22 01:27:56 harmony MT2060: PLL div1=87  num1=22  div2=73  num2=8115
Apr 22 01:27:56 harmony MT2060: PLL [1..5]: a5 57 23 fb 93
Apr 22 01:27:56 harmony MT2060: IF1: 1220MHz
Apr 22 01:27:56 harmony MT2060: PLL freq=191625kHz  f_lo1=1411500kHz 
f_lo2=1183750kHz
Apr 22 01:27:56 harmony MT2060: PLL div1=88  num1=14  div2=73  num2=8064
Apr 22 01:27:56 harmony MT2060: PLL [1..5]: 93 58 20 f8 93
=====================

The channels.conf entries for these 3 channels, in order, are:

TEN
HD:219500000:INVERSION_AUTO:BANDWIDTH_7_MHZ:FEC_3_4:FEC_1_2:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_16:HIERARCHY_NONE:514:0:1576

7
Digital:177500000:INVERSION_AUTO:BANDWIDTH_7_MHZ:FEC_2_3:FEC_2_3:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_8:HIERARCHY_NONE:513:514:1312

NINE
HD:191625000:INVERSION_AUTO:BANDWIDTH_7_MHZ:FEC_3_4:FEC_3_4:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_16:HIERARCHY_NONE:512:0:5

Any help to get this working properly would be much appreciated. Please
let me know if I can provide more information or do some experiments.

Cheers,

 - Simon




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