Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.


View this topic in a long page with up to 500 replies per page Create new topic
1 | 2 


270 posts

Ultimate Geek
+1 received by user: 1


  Reply # 531515 10-Oct-2011 14:00
Send private message

Well Saturday on the roof.

It was a bit windy - at least it wasn't wet!

Took the tools up there and a can of CRC.

Tightened the F plug where it was connected to the in built diplexer and noticed the F socket was turning itself.

Opened up the diplexer and saw that the socket turning had caused the wires to twist and one had broken it's solder join from the socket.

Disassembled it and took it down to the workshop for a re-solder.

Re-installed and did the obligatory CRC spray over everything (it was windy).

Result:

Now have a high signal on all MUX. Will check it out again tonight (Monday) as another storm is forecasted.

I have a Sony TV and have some interesting signal stats that I would like to understand:

For each channel you get a Pre Viberbi reading, a 5s reading a UEC and a COFDM AGC reading. There is also a Post Viberbi reading and a post 5s reading.

For all MUX the 'post' readings were all zero. I assume this is something to do with measuring the errors post the decryption process - so I guess zero is good.

The UEC reading in all cases was zero.

The COFDM AGC reading ranged from -480 to -500 across the three MUX.

The Pre Viberbi reading on TVNZ was 1.25 e-4 sometimes hiting 8.3 e-5. The 5s was 1.06 e-4 sometimes 9 e-5.

On Mediaworks the Pre V was 1.7 e-4 and 5s 1.7 e-4.

On Kordia the Pre V was 1.2 e-4 sometimes 8 e-5 and the 5s was 1.01 e-4.

What does all this mean?

545 posts

Ultimate Geek
+1 received by user: 11


  Reply # 531569 10-Oct-2011 16:01

steve2222: Well Saturday on the roof.

It was a bit windy - at least it wasn't wet!

Took the tools up there and a can of CRC.

Tightened the F plug where it was connected to the in built diplexer and noticed the F socket was turning itself.

Opened up the diplexer and saw that the socket turning had caused the wires to twist and one had broken it's solder join from the socket.

Disassembled it and took it down to the workshop for a re-solder.

Re-installed and did the obligatory CRC spray over everything (it was windy).

Result:

Now have a high signal on all MUX. Will check it out again tonight (Monday) as another storm is forecasted.

I have a Sony TV and have some interesting signal stats that I would like to understand:

For each channel you get a Pre Viberbi reading, a 5s reading a UEC and a COFDM AGC reading. There is also a Post Viberbi reading and a post 5s reading.

For all MUX the 'post' readings were all zero. I assume this is something to do with measuring the errors post the decryption process - so I guess zero is good.

The UEC reading in all cases was zero.

The COFDM AGC reading ranged from -480 to -500 across the three MUX.

The Pre Viberbi reading on TVNZ was 1.25 e-4 sometimes hiting 8.3 e-5. The 5s was 1.06 e-4 sometimes 9 e-5.

On Mediaworks the Pre V was 1.7 e-4 and 5s 1.7 e-4.

On Kordia the Pre V was 1.2 e-4 sometimes 8 e-5 and the 5s was 1.01 e-4.

What does all this mean?


Glad to see that you probably found the problem and that the whole DTT system wasn't to blame!

The pre viterbi levels show the bit error rates on each mux. I would think that 1.0 e-4 or lower should be OK. (that is one error in 10000, 1.0 e-6 is one error in 1000000 which is better again)




don't mess with me.... i'm the hd insider....

1 | 2 
View this topic in a long page with up to 500 replies per page Create new topic



Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

Red Hat unveils production-ready open source hyperconverged infrastructure
Posted 23-Jun-2017 22:10


Whatever ailed Vodafone broadband … seems to be fixed
Posted 23-Jun-2017 14:10


VMware NSX Meets Stringent Government Security Standards with Common Criteria Certification
Posted 22-Jun-2017 19:05


Brother launches next-generation colour laser printers and all-in- ones for business
Posted 22-Jun-2017 18:56


Intel and IOC announce partnership
Posted 22-Jun-2017 18:50


Samsung Galaxy Tab S3: Best Android tablet
Posted 21-Jun-2017 12:05


Wellington-based company helping secure Microsoft browsers
Posted 20-Jun-2017 20:51


Endace delivers high performance with new 1/10/40 Gbps packet capture card
Posted 20-Jun-2017 20:50


You can now integrate SMX security into Microsoft Office 365, Google and other cloud email platforms
Posted 20-Jun-2017 20:47


Ravensdown launches new decision-making tool HawkEye
Posted 19-Jun-2017 15:38


Spark planning to take on direct management of all consumer stores
Posted 19-Jun-2017 10:03


Qrious acquires Ubiquity
Posted 14-Jun-2017 12:21


Spark New Zealand prepares for 5G with Nokia
Posted 14-Jun-2017 12:16


The future-proof 10.5-inch iPad Pro
Posted 13-Jun-2017 18:16


Mandatory data breach reporting in Australia
Posted 13-Jun-2017 11:30



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.