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Posts: 50
Reply with quote  #16 
Not sure if my experience with my setup will apply here but I thought it can't hurt to share [smile]

I have a 1.2m ku pll setup and I was having he same symptoms on 103w 11760 5/6 fec. After troubleshooting everything I determined it was my lnb at fault, I bought 2 replacements (identical lnbs) and swapped one out and all was good again. A month later same problem started so I assumed bad luck or bad craftsmanship/cheap on the lnb and swapped it out with my last new one and it was good again for another week. Then it started acting up as well, so I took the first one apart and it appears fine so I put it back on and it works great again. So I've concluded they are getting moisture or frost inside them and after bringing them inside to thaw/dry out they are good again. Northern Canada here and we've had a really warm winter so far until last week when last one stopped it was -45C out, partly what helped me clue in to weather effecting the lnb. It also seems to effect the higher fec first, 5/6 gets drops were 2/3's don't etc. I have no experience with C band at all and the lnbs you use for it and if this could be possible?

Best of luck [smile]

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Posts: 5,818
Reply with quote  #17 
    Back in the analog days, I had a C-band LNB once that when it would start to get cold in the evening, like around  +12 deg F, would develop an oscillation that would slowly move up through the C-band transponders one at a time as the temperature continued to drop.  This oscillation would completely wipe out one transponder at a time.  It wouldn't do this every 10 sec problem described here, but the symptoms might be different for different LNBs.  At that time, I found that if I did a power cycle on the system that the oscillation would stop.  I eventually got a new LNB and the problem went away. 
   I have also seen some periodic outages (could have been in the every 10 sec time frame) that were caused by a receiver thinking it had lost lock, and it would try different diseqC switch settings periodically.  I thought it was my switch going bad, but I put a meter on the coax that had a 22KHz indicator light, and noticed that the receiver was sending out a diseqC signal every time I would have a signal blip. 


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Posts: 138
Reply with quote  #18 
During this cold weather I am getting 87w ku ten degrees off center I get 50q i regularly get 10q.

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Posts: 1,567
Reply with quote  #19 
Upon reading this topic I tried to look for someone that sold an LNBf with a rechargeable desiccant and found none.

But I did find this:

Which got me to thinking about my military days and we had to check the desiccants and pressure leaks
on our aircraft radar wave-guides. Low air pressure and moisture would cause arcing in the wave-guides.

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Posts: 1,011
Reply with quote  #20 
What is the solution to this problem?
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Fellow Members, your posts are welcome here! Do not worry about posting everything perfect. Different receivers and LNB's will give you different Frequencies and Symbol Rates. Some set top boxes, PCI cards and USB receivers, Do Not Require all of the same information that others may need. It is not Required to post everything that others may need to tune in a feed. It is just most important to share the find. We can always adjust the Frequency and Symbol Rates and try the various Modulations and FEC's on our own receivers until we get a lock and then give a polite reply with what works for your receiver, as that information might help others as well. We all appreciate the efforts and energy of the Posters!

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