Followup to Correct setting for LOW SIGNAL RECONNECT?
@flebourse Believe it or not, just got around to installing those inline 15dB attentuators. Here’s how things are looking now. Not sure if this is an improvement? What do you think?
Speed test via the mob1s1a1 interface is reporting ~7Mbit down x 26Mbit up. Not bad, but I’m not sure if I should try a different, slightly lower rated maybe 10dB? Or just leave it alone.
Hello,
The SINR is still very bad the other values are more in line with common cases.
Which sort of antennas do you use ? Directional (Yagi) ?
Have you an idea of the distance to the cell(s) tower(s) ?
Which frequency bands do you use ? Can you try using one band at a time ?
If you have an Android phone you can use the “LTE Discovery” application, it will tell you a lot about available bands, signal quality directions etc. The pro version costs a few bucks, money well spent (at least for me).
Regards,
Thanks. Well, I left the site already but I may go back in a few days and do some adjustment of the antenna. It’s a directional antenna. Not sure if I’m allowed to post the link here but I’ll try and see if it gets removed.
I’ll check in a bit on which bands I’m using, but I think I remember from looking at CellMapper that the tower is about 2 city blocks away (so only about 500ft). I don’t have an Android phone unfortunately, so I may end up needing to buy a simple RF meter.
You can try to orient the antenna away from the tower, RSSI and RSRP will go down but if you have some luck RSRQ and SINR will go up. Try 90° left or right first, check the result then adjust if you see something going in the right direction.
@flebourse Thanks. Will go back when the weather’s good. Here’s an image from Cellmapper that shows the area. I changed the radio from locked to B4 to “Auto” and it’s now switched itself to B2, with ever-so-slightly better looking signals.
Interesting. A 6dBm SINR increase isn’t small.
Try to point the antenna towards one tower, choose the one that has a band with the largest width.
Edit: I didn’t look carefully enough, but you have four cells on the B2 band in the vicinity… This will generate a lot of interferences.
What are the bandwidth of B2 B4 B13 and B66 for your operator ?
The operator is US Mobile (a Verizon MVNO). Not sure how to check or determine the bandwidths? I searched a bit and the best I could come up with was this post. According to that, it seems they might be:
| Band | Frequency (MHz) | Width (MHz) | |
|---|---|---|---|
| 2 | 1900 | 10 | |
| 4 | 1700/2100 | 20 | this is the widest band? |
| 5 | 850 | 10 | |
| 13 | 700 | 10 | |
| 66 | 1700/2100 | 5 | superset of B4 for extra capacity |
Yes B4 is the largest, should have the highest bandwith. So for testing restrict the RUTX to B4 only, and point the antenna at 84020 or 84862. SINR and RSRQ should increase significantly.
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