Symbolrate findings

[starman345]

Thought I would open this thread rather than hi-jack sky0001's any further. Brentb636 asked about symbolrate ranges of the Twinhan so I did a few tests.
I chose AMC3 for the satellite, and Tsreader 2.8.46b, tried both the twinhan 1020a and Skywalker 1 at various symbolrates.
On the Montana channel 12145, SR 4340 the Twinhan would acquire a lock anywhere from 4338 to 4343. The Skywalker would lock only on 4340 or 4341 actually I was surprised it locked at all, usually I can't get a lock.
On the PBSHD channel, 12140, SR 30000, the Twinhan would acquire a lock anywhere from 29988 to 30008. The Skywalker would lock anywhere from 29945 to 30045. Quite a difference there, the Skywalker did better at the higher symbol rate. Brent, that is a real difference from what you are saying you are getting with your Skywalker on a 30000 symbol rate. I wonder if the lnbf being used is a contributing factor? I'm using the Invacom quad.

 

[brentb636]

I'm using the Invacom quad also. That is puzzling . Can you look at a couple 4:2:2 feeds , since that's where most of the problems seem to occur. Perhaps, the reported symbol rates of the 4:2:2 feeds are more innaccurate on my Merc than other SR rates . I'm going to look at the PBS HD channel and try to duplicate your results on my skywalker.


Thanks
Brent

[edit] Played with it a little. After unplugging the skywalker-1 for a bit ( I almost never turn it off) , the skywalker-1 locked just fine on PBSHD at a SR=30031 . Also had no trouble locking at 29980 . Looks like I may have to only turn it on when I use it, and may avoid the problems I've been having. It wouldn't surprise me to have to revisit this thread as more evidence comes in. Thanks for helping , Starman.



Brent

 

[starman345]

Amc1 103.0

Tried the NBC mux at 11880H SR 26670 4:2:2
Twinhan 1020a locked anywhere from 26662 to 26677
Skywalker locked anywhere from 26629 to 26709
I noticed if I left the fec (tsreader calls it code rate) at the default setting the skywalker wouldn't lock at all, if I always just left it on auto it seemed to work fine.

 

[starman345]

Didn't notice you had edited your post before I posted mine. Odd, I have had my Skywalker since early-mid november and I don't ever remember having it powered down and I've had no problem like that. I find its really stable but I'm glad you posted your solution in case mine ever starts exhibiting those symtoms.

 

[brentb636]

Most of my problems are on the 4:2:2 sports feeds that I pick up blindscanning. Entering the SR rate of either my Merc or the IV200 , the skywalker has generally failed to lock. Several months ago, I talked about this in a different thread, and Updatelee mentioned the same problem. Now that we've gotten this far, I'll have to check it out more rigorously. This has been informative. My skywalker-1 is April 07, one of the last hand made batch by Genpix.
Thanks again,

Brent

 

[updatelee]

Ive noticed that as well, on high SR the genpix seems fairly flexible, but on low symbol rates boy it can be fussy. I resorted to using my analog ird tied into my shortwave radio to get an accurate SR.

 

[starman345]

Ive noticed that as well, on high SR the genpix seems fairly flexible, but on low symbol rates boy it can be fussy. I resorted to using my analog ird tied into my shortwave radio to get an accurate SR.

I have a few radios here I could use to find the sr but that is really cumbersome, expecially when I have the twinhan that tunes the lower ones really well. I jsut switch over to that. I'm waiting for that perfect receiver that does everything....high and low srs, blind scan, 4:2:2, hd, pvr, dvb-s2, etc, etc.....dream on eh?

 

[brentb636]

I think we share a dream, and I'll buy two of them !!

 

[starman345]

Brent, not sure if this applies or not but I was reading elsewhere about the Genpix devices and any unit after July 17/07 comes with current firmware, older than that can be updated with the firmware update utility. Since your's is an april/07 model, maybe an update might help, if you haven't done it already?

 

[brentb636]

Thanks Starman, but I've already updated it. I noticed last night that I didn't have any trouble locking on tp's that were "off" the actual SR by 10 or so. Now that I have the unit unplugged when not in use, the symptoms are not repeatable. Either a long term heat issue, or simply a "digital glitch" that needed resetting. I'm going to plug it back in again, and see what happens. Can't troubleshoot it , until I can get symptoms to repeat.



Brent