SINR had gotten worse over time! [SOLVED!]


I'm using the LTE service and had to get an external antenna installed.
Even before the install I was hitting max upload/download with the internal antenna but was intermittent.

When the external antenna was installed I went from 0 bars to 2.
Was consistently getting 10mbps/1mbps and its been good for just over a month. But now I notice that the speed is much slower almost unusable.

SINR now ranges from -5db to +2db.

Before going on the roof and re-positioning etc I thought I would check in with you guys and see if there is anything else I should be looking for.

I expect worse signal when the weather is bad but on a perfectly calm clear day its still bad.

Thanks in advance.





ozzcaddy-MODERATOR wrote 34 weeks ago

I would have a look at the following links to see if the there is a problem with the tower(s) that you are connecting to, has a problem.


This FAQ:

This is Optus Service Status website. If the tower icon is not green, click on the tower icon and it will display what is affected by whatever the problem may be.

When you login to the modem interface, check the Cell Id and see if it changes when your speed or number of bars changes. If the Cell Id is changing, this would indicate that your modem is switching towers looking for the best signal.

If the problem continues, you will be best to contact Vividwireless Tech Support : 1300 327 837

Adelaide, Brisbane, Melbourne and Sydney Customers (local time):
Monday to Friday 9am-10pm. Saturdays, Sundays and Public holidays from 9am-9pm.

Perth Customers (local time):
Monday to Friday 8am to 9pm. Saturdays, Sundays and Public Holidays from 8am to 8pm.

Post back with an update.


dicko72 wrote 34 weeks ago

Thank you for the info.

I have checked the tower status and it is green with no issues reported.
Also the cell ID appears to remain constant when SINR/Bars fluctuate.

I understand that Vivid don't support external antennas.

Would I be able to get support still?

Thanks again


ozzcaddy-MODERATOR wrote 34 weeks ago

I don't think they will provide support knowing there is an external aerial attached.

If you detach the aerial at the modem, then they will be able to assist you. As there are no problems with the tower themselves, Tech Support is the only avenue you have to have the problem looked into.

Don't be discouraged if they ask you to do fundamental things such as moving the modem etc. it is their procedure that they must follow.

Keep us posted.


Frosty-MODERATOR wrote 34 weeks ago

Another factor is probably whether you are in the coverage area or not. If you're in coverage, no problem. If you're just outside, that's probably okay (?) but if you're a long way outside that could be a problem as well.


dicko72 wrote 34 weeks ago

Yeah I'm in coverage according to the website.
Without the aerial the service was very intermittent.

Could it be possible that there are Tower issues that haven't been reported?

Or could it be a local source of interference?

Thanks again


Frosty-MODERATOR wrote 34 weeks ago

Yes, could be either of those things. That is why it is always good to report any issues to vividwireless through the normal channels, not just discuss here in the forums, so that any pattern can be established more quickly and issues discovered and resolved.

If you're in coverage, but performance is patchy, then it is likely to be either obstruction of the signal (buildings, trees, something metallic in the building, or similar) or maybe it could be interference if you are getting signal from one tower but via two separate paths, arriving slightly out of phase. You might need to do some investigative work without the external antenna to figure out likely causes? e.g. by shielding the modem so signal can only arrive from one direction and moving it around the premises to see what the signal characteristics are ... and by taking careful note of the location on nearby Optus towers. Bit of a painful process, but I expect you would have gone through something similar before deciding on getting an external modem?!


dicko72 wrote 34 weeks ago

No worries. I will report the issue.
I do have the antenna on a slant the same as the tower.
I'll try repositioning etc.

Thanks again all for your help


dicko72 wrote 34 weeks ago

OK, I have found the issue(s).
I had some excess cable from the antenna which I had looped.
I uncoiled it and did some long snake like runs (total is around 1.5m).
Due to this I had to move the modem out of the cupboard.

Now all is good! My SINR is above 3 for the few minutes I have been watching and my RSSI is -75dbm.

Speedtest also shows excellent results.

My gut feel is the modem didn't like being in the cupboard, I have a EoP powerline adapter in there.

But uncoiling the coax probably helped too.

What's weird is why it was OK and then stopped!

Either way I'm happy again :)

Thanks again folks.


Frosty-MODERATOR wrote 34 weeks ago

Glad you are getting a better result now!


ozzcaddy-MODERATOR wrote 34 weeks ago

Good to hear that you were able to solve the problem.


dfg555 wrote 32 weeks ago

dicko72 can you link to me what antenna did you buy?

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