Signal Quality issues - totally stumped

My first post so apologies if I step on anyones toes.
I've had a browse through and can't find an existing post that covers my scenario.
For a while now my box has been having issues on certain channels. The exact scenario is that the signal quality drops to below 25% which causes picture blocking / freezing.
Before anyone says its a MUX issue, I have tried.
1) New cables
2) Rebooting
3) Factory reset
4) A known good cheapie freeview receiver from Asda shows a static 95% quality on the channels where the BT Vision box has problems. With both the old and the new cables. No signal bouncing - stays solidly at 95% (or thereabouts)
The specific channels it has issues with are Channel 21 (VIVA),Channel 38 (quest +1). I am on Waltham transmitter and other channels on the MUXes have 85% quality and higher on the BT Vision box. On VIVA and Quest +1 the quality bounces all over the place between less than 25% upto 87%.
If it was all channels on the MUX then I'd know it was time for aerial reposition, but with it being on only specific channels and a cheapie receiver working perfectly I'm a bit stumped??
Additionally, since the new firmware, I use a 4:3 TV through SCART and the screen real estate now seems wrong as it chops the bottom off the screen when in the new menu system - so things telling me what to press are lost - ie: to delete a recording from the recordings section I can't see any advice at the bottom of the screen as was there on the old firmware, I basically found it was the red button by trial and error. I'm guessing BT think we all have HDMI TV's and maybe the menu works OK on HDMI.
Its as though the tuner has just decided it doesn't like channels 21 and 38 - maybe its telling me to to watch some better quality programs... Or more seriously, maybe its cooked and has a specific frequency reception issue? Unlikely but I can't think what else it could be.
If anyone can advise I'd appreciate some guidance as I've pretty much exhausted my limited knowledge of TV transmitter behaviour.
Pete

Hi Pete65,
It could be possible that if you are in the Northampton/Milton Keys/ Bedford/ etc areas, that particular mux could have some signal interference .
There was a post earlier which I can't find right now, where the author talks about signal quality vs signal strength.
It could also be possible that the signal is too strong which could cause a detrimental effect on the quality.

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Hi folks,
I have a confusing problem/error with using sdo_util.simplify. I am using Oracle 11G R2 with Spatial Option.
I have loaded just over 2000 UK postown polygons - based on an OS source. These loaded fine and have been working perfectly well with spatial sql.
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ORA-06512: at "MDSYS.MDERR", line 17
ORA-06512: at "MDSYS.SDO_UTIL", line 716
ORA-06512: at "MDSYS.SDO_UTIL", line 770
ORA-06512: at line 1
13199. 00000 - "%s"
*Cause:    This is an internal error.
*Action:   Contact Oracle Support Services.
I've tried various threshold and tolerance values ( the only threshold value that works is 0 which returns the same geometry.
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When I run a validate geometry on the table for the geometry column I get the ORA-13029: Invalid SRID in the SDO_GEOMETRY object.
However, as explained above the SRID was selected and checked using calculate MBR and it matches exactly what I would have expected given the source data and i have not found any other issues with the SRID.
The error can be reproduced without any of the source tables by just taking one small polygon definition as follows:
select sdo_util.simplify(
MDSYS.SDO_GEOMETRY(
2003,7405,NULL,MDSYS.SDO_ELEM_INFO_ARRAY(1,1003,1),
MDSYS.SDO_ORDINATE_ARRAY(407207.997315803,287087.001455892,
406802.999914517,286916.000404434,
406677.996543163,286831.004734191,
406518.001132497,286741.000497636,
406863.996876543,286566.000590838,
407284.000289033,286672.000248752,
407207.997315803,287087.001455892))
,5,0.005)
FROM dual;
ORA-13199: the given geometry cannot be rectified
ORA-06512: at "MDSYS.MD", line 1723
ORA-06512: at "MDSYS.MDERR", line 17
ORA-06512: at "MDSYS.SDO_UTIL", line 716
ORA-06512: at "MDSYS.SDO_UTIL", line 770
ORA-06512: at line 1
13199. 00000 - "%s"
*Cause:    This is an internal error.
*Action:   Contact Oracle Support Services.
Am totally stumped with this!
Can anyone offer any thoughts or guidance?
Many thanks in advance.
Mike.

Hi Mike,
Usually someone jumps in early with the "geometry ain't valid" answer so I am late to the party. When I attempt to validate your 7405 geometry using 11gR2, I receive back error 13029.
SELECT
SDO_GEOM.VALIDATE_GEOMETRY_WITH_CONTEXT(
   MDSYS.SDO_GEOMETRY(
      2003,
      7405,
      NULL,
      MDSYS.SDO_ELEM_INFO_ARRAY(1,1003,1),
      MDSYS.SDO_ORDINATE_ARRAY(
         407207.997315803,287087.001455892,
         406802.999914517,286916.000404434,
         406677.996543163,286831.004734191,
         406518.001132497,286741.000497636,
         406863.996876543,286566.000590838,
         407284.000289033,286672.000248752,
         407207.997315803,287087.001455892
   0.005
FROM
dualThe error indicates that SRID 7405 "is invalid" which is not really all that informative. As you note above 7405 exists in MDSYS but its marked as a COMPOUND CRS which to keep it simple is a 3D CRS.
(see http://download.oracle.com/docs/cd/B28359_01/appdev.111/b28400/sdo_cs_concepts.htm#autoId18)
Thus "invalid" in this context means the SRID is invalid for the geometry you are putting it upon.
So if we just add a Z to your geometry everything works hunky-dory
SELECT
SDO_GEOM.VALIDATE_GEOMETRY_WITH_CONTEXT(
   MDSYS.SDO_GEOMETRY(
      3003,
      7405,
      NULL,
      MDSYS.SDO_ELEM_INFO_ARRAY(1,1003,1),
      MDSYS.SDO_ORDINATE_ARRAY(
         407207.997315803,287087.001455892,0,
         406802.999914517,286916.000404434,0,
         406677.996543163,286831.004734191,0,
         406518.001132497,286741.000497636,0,
         406863.996876543,286566.000590838,0,
         407284.000289033,286672.000248752,0,
         407207.997315803,287087.001455892,0
   0.005
FROM
dualAnd your SIMPLIFY task also then works fine
SELECT
SDO_UTIL.SIMPLIFY(
   MDSYS.SDO_GEOMETRY(
      3003,
      7405,
      NULL,
      MDSYS.SDO_ELEM_INFO_ARRAY(1,1003,1),
      MDSYS.SDO_ORDINATE_ARRAY(
         407207.997315803,287087.001455892,0,
         406802.999914517,286916.000404434,0,
         406677.996543163,286831.004734191,0,
         406518.001132497,286741.000497636,0,
         406863.996876543,286566.000590838,0,
         407284.000289033,286672.000248752,0,
         407207.997315803,287087.001455892,0
   5,
   0.005
FROM
dualSo long-winded way to reiterate what Ivan said - you are using the wrong SRID. 10g was more forgiving than 11g when mixing and matching 3D and 2D SRIDs with data. 11g is more picky but not always that great at explaining the pickiness. I would bet if you had got back an error such as "2D coordinates not valid with 3D SRID" you would never have needed to post the question. I would suggest putting in an enhancement request to Support for some better error messages.
Cheers,
Paul
Edited by: Paul Dziemiela on Nov 6, 2011 10:58 AM

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Error Message(s)

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Signal Quality issues - totally stumped

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