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First, to answer Don's question: what has RX IFL10 got to do with anything? First we determined, by application of cold water from the ground, that the outdoor unit was very temperature sensitive on the receive, so I suspected the LNB, even though it had been replaced. Checking the part numbers, I found that an NJR2535S had been replaced with the newer NJR2835S. A web search indicated that the newer unit was a PLL and requires the 10 MHz reference signal to accurately hold frequency. So the experiment was to first see if the option file had the 10 MHz reference turned on the receive cable. Then we would apply that reference ourselves and see if the receive signal changed by "tuning in" the receiver more accurately.
There was an improvement, and a second improvement was achieved by manual positioning but there is still more to come.
John
[ February 09, 2011, 08:56 PM: Message edited by: John Watson ]
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There shouldnt be a 10MHz requirement on a PLL NJR (BUC side of the VSAT, different story). That NJR is a good LNB....and they dont go bad very often. Matter of fact, I have only seen one go bad...ever.
These radical swings are either tracking, remote side cabling, or fringy beam coverage. It is really, really hard to assess without seeing the hub GUIs.
-------------------- Mike Posts: 567 | From: North Carolina | Registered: May 2007
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John: System locked-on right away this morning at 8a with temperatures only in the low 40s. Sunshine! We will be home for a while this morning, but are driving up to Julian for pie mid-day.
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Just after 4p here in Borrego Springs. Still not a cloud in the sky, but the temperature is dropping and so is my SNR. Figure we will lose service at any moment.
It is about 60 degrees now. Interesting because when the sat locked on this morning it was only 45 degrees.
posted
now turn off the fans and let the iDirect 3100 modem get a little warmer, like it was at mid day and see where your SNR goes. You may even need to lay a magazine on top for 20 min or so.
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Did the techs swap any cabling on your system when they came to troubleshoot (when they swapped your Feed, LNB, etc)? Sure would be nice to replace your rx cabling to see if it has any bearing.
-------------------- Mike Posts: 567 | From: North Carolina | Registered: May 2007
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So, the system locks on a 7-8am (@45 degrees) with 7+ dB of Receive SNR...then hangs in there for the day...an slopes off at 4-5pm as the temp drops. Interesting. The techs changed your LNB, feed, and ran cabling for troubleshooting purposes...did they swap in a new modem by chance?
-------------------- Mike Posts: 567 | From: North Carolina | Registered: May 2007
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TGT, please hit that LNB with the cold water again to rule out a temp issue or condensation. It works so much better with the 10 mhz reference turned on.
If there is no change with the cold water, ... well more on that later. I think we had two problems.
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