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4620LE terrible performance but 4510L great, same 3g signal?

 
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asdfffdsa
EVDO Fledgling


Joined: 31 Mar 2012
Posts: 12

PostPosted: Wed Nov 27, 2013 12:19 pm    Post subject: 4620LE terrible performance but 4510L great, same 3g signal? Reply with quote

Hello, I recently purchased for a neighbor of mine a Mifi4620LE from Millenicom with their service and while the RSSI is very good (-55dBm), the EC/IO is terrible (+10dB)--this brings the signal quality down to 2 bars. The discouraging thing is that when I test their 3G signal with my Mifi4510L, while the RSSI is identical, the EC/IO is very good (-10dB) and I get full bars. Again, this is with the same exact 3G signal, and I also set them up with a cell signal booster. There is a very noticeable difference between the two devices performance wise (I assume as a result of the high EC/IO).

I'm about to complain to Millenicom, but my neighbors (again, who I set this up for) had to waive their right for a refund b/c the maps Millenicom uses to determine whether or not a given area has a good signal quality say this area is poor--it is only as a result of the cell signal booster that a sufficient signal quality is achieved. I have a feeling that they're going to give us the "not our problem" response as a result, so I wanted to check here first.

Does anyone know what could be causing this?
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MGD4me
EVDO User


Joined: 17 Mar 2009
Posts: 66

PostPosted: Wed Nov 27, 2013 12:32 pm    Post subject: Reply with quote

What type/model of cell signal booster are we talking about here?? I suspect that you are using your device indoors, so could you see what the results would be again outside. Try to find a location with a better signal level without the booster.

-55dBm is a very high signal level, and it is possible that your booster is seeing a crappy signal to start with, and just making it stronger, therefore making it worse than the "unboosted" signal.

I'd be curious to learn more about your actual setup, antenna placement, type of booster, etc. Hard to know exactly without the details. ;o)
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asdfffdsa
EVDO Fledgling


Joined: 31 Mar 2012
Posts: 12

PostPosted: Wed Nov 27, 2013 5:44 pm    Post subject: Reply with quote

They are using the 801247 Wilson cell signal booster kit. The outdoor antenna is on the side of their house and the indoor antenna is inside over 25 horizontal feet away facing the opposite direction (180 degrees). The results are the same regardless of whether or not the setup is indoors or outdoors. Without the booster (outdoors) they get about -90dBm, but I'm confused what you mean by "just amplifying a crappy signal"--I thought that was what the booster was for in the first place.

But the thing is that the 4510L works extremely well in this setup (both in terms of the readings and observed performance), whereas the 4620LE has a much worse ec/io and performs worse. The next thing I will do is ask them to let me borrow their 4620LE and see how it performs at my own house.
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MGD4me
EVDO User


Joined: 17 Mar 2009
Posts: 66

PostPosted: Wed Nov 27, 2013 6:31 pm    Post subject: Reply with quote

Quote:
"just amplifying a crappy signal"


That is not quite what I said... I said " it is possible that your booster is seeing a crappy signal to start with, and just making it stronger, therefore making it worse than the "unboosted" signal. .

What I meant by that is the following: if the signal where you are is extremely low, and it is buried in noise or other interference, then the booster amplifier can only amplify what it is presented to the input port. In addition, a high gain amplifier will add a bit of background noise itself, further reducing the signal-to-noise ratio somewhat. No amplifier is perfectly clean.

Thanks for adding in the details of your booster. That clears up what you actually have. But, it doesn't explain why the 4510L works well, and the 4620LE does not. I'm with you there... that doesn't make sense. If they are with the same service provider, they should both work equally well.

If I come up with any further ideas, I'll let you know. That's all I got for now.
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asdfffdsa
EVDO Fledgling


Joined: 31 Mar 2012
Posts: 12

PostPosted: Wed Nov 27, 2013 7:01 pm    Post subject: Reply with quote

MGD4me wrote:
Quote:
"just amplifying a crappy signal"


That is not quite what I said... I said " it is possible that your booster is seeing a crappy signal to start with, and just making it stronger, therefore making it worse than the "unboosted" signal. .

What I meant by that is the following: if the signal where you are is extremely low, and it is buried in noise or other interference, then the booster amplifier can only amplify what it is presented to the input port. In addition, a high gain amplifier will add a bit of background noise itself, further reducing the signal-to-noise ratio somewhat. No amplifier is perfectly clean.

Thanks for adding in the details of your booster. That clears up what you actually have. But, it doesn't explain why the 4510L works well, and the 4620LE does not. I'm with you there... that doesn't make sense. If they are with the same service provider, they should both work equally well.

If I come up with any further ideas, I'll let you know. That's all I got for now.


Thanks! I'll keep the thread updated with any new findings
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Jim_in_VA
EVDO Addict


Joined: 09 Apr 2007
Posts: 1066
Location: On the Chesapeake Bay, Virginia

PostPosted: Wed Nov 27, 2013 9:21 pm    Post subject: Reply with quote

There is a firmware update for the 4620LE that came out a few days ago that solves many problems. It can be a message sent to the LED screen or you can go to the admin page via a browser and download it.
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