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SignalCheck - Android app to monitor your 2G/3G/4G LTE signal strengths


mikejeep

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Hrmmmmm.. if those channel numbers are correct, you are right, that is band 25. The problem is, the last two characters of the GCI (09) do not follow the band 25 pattern; until now, that had been indicative of band 26.

 

This is disappointing.. or a misconfigured site. Or the channel numbers are wrong. Several possibilities, but I tend to trust HTC's engineering screens unless someone is aware of issues with the M8's screens? I can definitively tell you that SignalCheck is assuming that is band 26 because the GCI ends in 09, which in turn is why the (incorrect) 760/805 MHz readings are being displayed -- the B26 formula is being applied to an apparent B25 site.

 

-Mike

 

I'm in a Shentel area, not sure if that has anything to do with it. I've seen the GCI end in 0-4, 6-9, and E-G on both my M7 and M8 if I remember correctly.

 

Sent from my HTC ONE M8

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I received your report, thanks.. are you sure you have seen other GCIs on that version of Android? The error I saw in the log is related to a new HTC security permission that I believe got added with the KitKat update, and isn't in the public version of the app yet (it's in the beta that is in testing now).

 

 

I haven't seen anything like that myself -- can you point me to an app that does that so I can check it out? I don't really think it would be feasible, because of the way that Google Play handles beta updates; it's an entirely separate APK. Just like how Lite and Pro are two completely independent apps that I maintain separate code branches for.

 

While the main focus of my work over the past 3 months has been fixing the crashing and stability issues, the features I added along the way weren't added separately, but as part of the app as a whole. I implemented the site note feature as a way to help track some of the instability problems that were happening, and when it worked better than I thought, I just cleaned it up a bit and added it to the beta. It was never at a point where the app was stable and I just started adding new features. I would have released it had it gotten to that point. :)

 

 

Great question! Something like Titanium Backup would do the trick (be sure to back up data, not just the app), or you could copy the signalcheck_log.db file out of /data/data/com.blueline.signalcheck/databases but I believe you need to be rooted for either option. That is a standard sqlite database, and there is nothing in it that restricts it to a specific device. In the future, I will be looking into adding more import/backup/restore functions from within the app. Export to .csv is all that is included right now.

 

I plan to publish more information about the database stuff once it's released, because there is a ton of potential with it. If someone took the time to merge a market spreadsheet with the SignalCheck database (which wouldn't be too tricky if you knew what you were doing), you could instantly have a fully "noted" market with very little effort -- and you could share that with anyone you wanted.. like in a market thread on here.. ;)

 

-Mike

Now I need to get Access fired up and see what I can do lol

 

 

Sent from my iPad using Tapatalk

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My wireless nerd tower hunting has been changed forever. I am adding each sector cardinal direction too (N), (SW), (SE), etc. Viva le note feature!

uploadfromtaptalk1397578019411.jpg

Robert via Nexus 5 using Tapatalk

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Mike,

I think their is a bug in the Show Site Hints I have Sprint 3 selected.

On 1X PCS BID is 511B hex sector 3 but on 1X 800 129B hex sector 2 should be 3. So it thinks 1299, 129A and 129B are different sites for the add a note.

The East Texas market uses both 9, A, B and also 1, 2, 3 on the BID hex.

Only difference is 9, A, B (NID: 311) is offset BSL and 1, 2, 3 (NID: 312) is exact BSL.

SCP_SID1.jpg

 

SCP_SID3.jpg

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I'm in a Shentel area, not sure if that has anything to do with it. I've seen the GCI end in 0-4, 6-9, and E-G on both my M7 and M8 if I remember correctly.

 

Sent from my HTC ONE M8

 

I'm not sure we've seen GCI screen shots from a Shentel area. Probably why we've never seen the pattern before. At least, I haven't seen one from a Shentel area. 

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Mike,

 

Questions on the database.  I'm writing some queries to convert some data over and thought of something.  Say for instance I've only attached to the alpha sector on a site.  I hit add note on that sector and put in my note.  Of course the app updates that row in the database, if I pass the alpha sector again it will of course show it.  Now say I pass on the beta or gamma side won't the application make two additional rows in the database?  Will it automatically copy the note from the previous north sector?  or will I end up with two rows for this site with no note?  Depending on how things fall in the database this might show up blank right?  I believe you said you were doing a select query just based on the left 6 of the GCI and MCC/MNC right?

 

I think I'm going to run an update query to automatically make the three rows for each site to cover all the bases but it was just one of those "what if" moments that someone might run into.

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Very good info, I don't think I was aware of the S4T displaying GCI (does the enginerring screen even show it?), and I had not sought out any S5 information yet -- excellent, thank you both! I will edit my previous posts. Hopefully this will no longer be an issue on future devices. Too bad it took so long to get this far.. I know there are a lot of S3 and S4 users who would love to see GCIs.

 

-Mike

If s4 users want gci they just need to upgrade to kitkat. It's to bad I can't use kitkat yet wifi stops working. https://www.dropbox.com/s/640mkyvyuvimk1p/Screenshot_2014-04-04-08-58-55.png

 

Couple questions the bsl in the dropdown shouldn't it be with 1x now its with data notification box. When I connect to 1x only the bsl wouldn't show because I have hide duplicate 1x enabled.

 

When you log is there a little delay to let things settle before you add to the log? I saw it logged a gmo as having 1x800 everything in the log looked correct but it's a gmo. I have had issues at my house when it will jump between towers with 800 and that gmo site and it will show that gmo tower as having 800. I cleared the log to try to reproduce it I couldn't yet maybe this weekend I will check it out again.

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I'm not sure we've seen GCI screen shots from a Shentel area. Probably why we've never seen the pattern before. At least, I haven't seen one from a Shentel area.

5ave2ymu.jpg

 

I'm in a Shentel area and it's showing as B26 but it should be B25. I double checked this in the LTE engineering screen. I got excited for a second but it's OK. I know it's coming here soon.

 

Sent from my SPH-L720T using Tapatalk

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I'm in a Shentel area and it's showing as B26 but it should be B25. I double checked this in the LTE engineering screen. I got excited for a second but it's OK. I know it's coming here soon.

 

Sent from my SPH-L720T using Tapatalk

So it looks like we may have an issue with the Shentel network. They are not following the GCI pattern that the rest of the Sprint network follows. Everywhere else, a GCI ending in 19, 1A, 1B or 0F, 10, 11 are always associated with B26. Because your GCI ends in an A, Signal Check assumes it is Band 26, even though it is not.

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Trying to reproduce it and send a diagnostic report but my first LTE note entry is sticking to other LTE sites.

I have the same thing. It only changes if I exit and load it up again. I need to wait until I drive again tomorrow to capture the issue and send a report if necessary.

 

This is an awesome update! Thank you mikejeep

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I'm in a Shentel area and it's showing as B26 but it should be B25. I double checked this in the LTE engineering screen. I got excited for a second but it's OK. I know it's coming here soon.

So it looks like we may have an issue with the Shentel network. They are not following the GCI pattern that the rest of the Sprint network follows. Everywhere else, a GCI ending in 19, 1A, 1B or 0F, 10, 11 are always associated with B26. Because your GCI ends in an A, Signal Check assumes it is Band 26, even though it is not.

 

I think David is right.. this puts a wrinkle into things, although it does not appear to be completely unusable. As long as the Shentel B25 sites don't cross over into the specific suffixes that we have seen on B26 sites, it can still be handled. I have only seen 09 and 0A display incorrectly so far. Right now, SignalCheck assumes 01/02/03/04 is B25 and everything else is B26, because that was how the pattern had been identified to that point.. I just might have to get a little more specific.

 

I'm in a Shentel area, not sure if that has anything to do with it. I've seen the GCI end in 0-4, 6-9, and E-G on both my M7 and M8 if I remember correctly.

 

Do you recall the last TWO characters? That's what I need. If Shentel folks could provide more examples (I don't need full screenshots, I trust your word) of GCIs they are seeing in the wild, I'd appreciate it! One tool I don't have in my test suite is the ability to connect to a Shentel site from 1000 miles away.. ;)

 

-Mike

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Most pre-Spark Samsung devices do not show the GCI.. so there is no way for the app to know which site you are connected to. I've tried communicating with Samsung, but I don't think my feedback went as far as I would have liked. But the Galaxy S4T and S5 apparently do show this information, so if you have one of these, you should be fine.

-Mike

It appears the SG4 also will show the GCI, I grabbed this screen while I was connected to an LTE tower in the area.

GCI_GS4.jpg

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...said the Road Runner to the entire clan of Coyotes.

 

I have some testing to do myself, then I'll test it on a couple folks with Sprint phones to make sure I got their GCIs right, by that time mikejeep might have written something already though.  We will see..

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I filed a diagnostic report for the issue I am experiencing with the LTE note field not changing when a different site comes up. The only way I have found to bring the correct label up is to exit and reenter the app. Here is an example :

 

menyrymu.jpg

 

9y5aguja.jpg

 

See how the gci changed but the note did not? I do not have note entries for either of those LTE GCIs but it doesn't seem to matter. Let me know if you need me to try anything or if I am doing something wrong. I did clear all the site log data. The 1x notes work as expected although I am not really using them.

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I think David is right.. this puts a wrinkle into things, although it does not appear to be completely unusable. As long as the Shentel B25 sites don't cross over into the specific suffixes that we have seen on B26 sites, it can still be handled. I have only seen 09 and 0A display incorrectly so far. Right now, SignalCheck assumes 01/02/03/04 is B25 and everything else is B26, because that was how the pattern had been identified to that point.. I just might have to get a little more specific.

 

 

Do you recall the last TWO characters? That's what I need. If Shentel folks could provide more examples (I don't need full screenshots, I trust your word) of GCIs they are seeing in the wild, I'd appreciate it! One tool I don't have in my test suite is the ability to connect to a Shentel site from 1000 miles away.. ;)

 

-Mike

My home tower has 09, 0A, and 0B. I'll keep hunting and let you know if I come across anything different.

 

Sent from my SPH-L720T using Tapatalk

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Love the WiFi info readings, but do have GCI issue on GS5 T-Mobile variant.

 

Milan, please go to About > Send Diagnostics when you are connected to LTE without a GCI, and I can take a look to see if there are any errors that I can address on my end. Chances are the radio firmware isn't programmed to report it, in which case it's up to Samsung to fix it.

 

If s4 users want gci they just need to upgrade to kitkat. It's to bad I can't use kitkat yet wifi stops working.

It appears the SG4 also will show the GCI, I grabbed this screen while I was connected to an LTE tower in the area.

 

Oh that's great! Maybe the GCI will appear for Sprint users with KitKat and beyond then, not necessarily Spark devices. I believe the original release of the S4T did not show GCI on Jelly Bean.

 

-Mike

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I think their is a bug in the Show Site Hints I have Sprint 3 selected.

On 1X PCS BID is 511B hex sector 3 but on 1X 800 129B hex sector 2 should be 3. So it thinks 1299, 129A and 129B are different sites for the add a note.

The East Texas market uses both 9, A, B and also 1, 2, 3 on the BID hex.

Only difference is 9, A, B (NID: 311) is offset BSL and 1, 2, 3 (NID: 312) is exact BSL.

 

I think you are reading more into the Site Hint feature than is really there. The only difference between Sprint 1 and Sprint 3 is what character position the sector is derived from; either position "1" (the last character of the hex BID) or "3" (the 3rd-to-last character of the hex BID). So 1299, 129A, and 129B will all show "Sector 2" if you have Sprint 3 selected, or "Sector 9/A/B" if you have Sprint 1 selected.

 

The site note feature is completely separate from the site hint display. Every unique SID+NID+BID trio has its own note. There is no way for the app to know if BIDs are located at the same site, so you will have to save a note for each sector. This also means you need to duplicate the efforts for 800 SMR, although I'd like to find a solution for that, since I believe the NID+BID are the same for PCS and SMR.

 

Each market assigns BIDs differently; for example, in my area, sectors on the same site have wildly different BIDs, with no identifiable pattern. Unlike the LTE GCI, where the first 6 characters indicate the site, there is no similar identifier for 1X or GSM.

 

Hopefully that clears things up for you.. or if I totally misunderstood your question, let me know.

 

-Mike

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Trying to reproduce it and send a diagnostic report but my first LTE note entry is sticking to other LTE sites.

I filed a diagnostic report for the issue I am experiencing with the LTE note field not changing when a different site comes up. The only way I have found to bring the correct label up is to exit and reenter the app. Here is an example : ...

 

See how the gci changed but the note did not? I do not have note entries for either of those LTE GCIs but it doesn't seem to matter. Let me know if you need me to try anything or if I am doing something wrong. I did clear all the site log data. The 1x notes work as expected although I am not really using them.

 

Hmm.. I'm guessing this bug is isolated to HTC phones, because the app has more than one method to grab the GCI on those devices, and I think you are both on an HTC based on your profiles. If you could make some site notes on various sites (if it lets you) and then send me the database file or a .CSV export of it, it might help me troubleshoot it a little quicker.

 

-Mike

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I think you are reading more into the Site Hint feature than is really there. The only difference between Sprint 1 and Sprint 3 is what character position the sector is derived from; either position "1" (the last character of the hex BID) or "3" (the 3rd-to-last character of the hex BID). So 1299, 129A, and 129B will all show "Sector 2" if you have Sprint 3 selected, or "Sector 9/A/B" if you have Sprint 1 selected.

 

The site note feature is completely separate from the site hint display. Every unique SID+NID+BID trio has its own note. There is no way for the app to know if BIDs are located at the same site, so you will have to save a note for each sector. This also means you need to duplicate the efforts for 800 SMR, although I'd like to find a solution for that, since I believe the NID+BID are the same for PCS and SMR.

 

Each market assigns BIDs differently; for example, in my area, sectors on the same site have wildly different BIDs, with no identifiable pattern. Unlike the LTE GCI, where the first 6 characters indicate the site, there is no similar identifier for 1X or GSM.

 

Hopefully that clears things up for you.. or if I totally misunderstood your question, let me know.

 

-Mike

Ok.

The BID is different for PCS and SMR here.

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Questions on the database.  I'm writing some queries to convert some data over and thought of something.  Say for instance I've only attached to the alpha sector on a site.  I hit add note on that sector and put in my note.  Of course the app updates that row in the database, if I pass the alpha sector again it will of course show it.  Now say I pass on the beta or gamma side won't the application make two additional rows in the database?  Will it automatically copy the note from the previous north sector?  or will I end up with two rows for this site with no note?  Depending on how things fall in the database this might show up blank right?  I believe you said you were doing a select query just based on the left 6 of the GCI and MCC/MNC right?

 

I think I'm going to run an update query to automatically make the three rows for each site to cover all the bases but it was just one of those "what if" moments that someone might run into.

 

This is kind of tricky to explain and will probably make some heads spin, but I will try to be as clear as possible..

 

When you connect to an LTE site, the app queries the database looking for the first entry that matches the first (left) 6 characters of the GCI. As soon as it finds a match, it grabs that note and does not look any further. I believe by "first entry", it would be the entry that appears in the database first without any sorting/filtering applied.

 

Let's say you install the app for the first time and connect to GCI 111222CC. The app searches the database for any GCI that starts with "111222" and comes up empty handed, because you've never used the app so the database is empty. Let's say you save a note "High School" for this GCI. Later in the day, you connect to 111222BB. The app scans the database the same way, and gets a hit on the CC sector entry from before, so it grabs that note and displays "High School" on the screen. However, it does not save an entry for BB at that time *unless* the Site Logger is active. A database entry (row) is only added/updated when either A) the Site Logger is active, or B) the site note is edited from within the app. [i wrestled with the best way to implement this; I ultimately decided that if someone has the Site Logger disabled, they have explicitly indicated that they do not want to expend the system resources to add a row the database every time a new LTE sector is discovered.]

 

Whenever you edit a site note from within the app, regardless of what sector you are on, it will add/update a row for the exact GCI you are connected to, AND it will update any existing rows that have a GCI that matches the first 6 characters (i.e. all entries that are associated with that site). [The rationale for adding a new entry at this moment is because the user is actively doing something to push data to the database, so the brief use of resources is intentional.]

 

So if you never edit the site note for 111222xx through the app after the first time, a note will only physically appear in the database entry for GCI 111222CC. The user_note field will be blank on the other sectors, but because the app doesn't bother searching beyond the first entry it finds for a particular site, it will always appear in the app. It only becomes problematic/confusing if someone is looking at the database (or an export of it).

 

I have some testing to do myself, then I'll test it on a couple folks with Sprint phones to make sure I got their GCIs right, by that time mikejeep might have written something already though.  We will see..

 

Oh I'll be doing the bugfix dance for awhile, so no new goodies like that will be coming out of me for a bit.

 

Speaking of bugs, I might as well mention what I am already aware of.. anyone experiencing the following problems do not need to provide me with any information, I have identified the causes and fixes are in progress:

  • Band 41 identification has become less reliable for some users.
  • Enabling the Location Service in locales that use a comma instead of a period as a decimal separator will likely crash the app.
  • Using the "Verizon" site hint option causes crashes for some users.
-Mike
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Ok.

The BID is different for PCS and SMR here.

Aha, thanks for the heads up, I will scrap that idea then! The PCS and SMR BIDs happen to match here. Very interesting to see how the site ID aspect of Sprint's network architecture varies so much across the country. I'm sure they weren't ever concerned with the public actually paying attention to any of this stuff though.

 

-Mike

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My home tower has 09, 0A, and 0B. I'll keep hunting and let you know if I come across anything different.

 

Sent from my SPH-L720T using Tapatalk

Those are the same that I am seeing so far. The majority of sites follow the normal setup. The sites with more than 3 panels appear to be the problem child.

 

Sent from my HTC ONE M8

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      First week in the field
      The Tri Band Modem got pressed into service a little quicker than planned, as my main unit went down with a bad transmission and the U600 USB modem with a Cradlepoint that was in this unit appears to have been damaged by the wrecker’s radio which runs on the edge of the WiMax frequency at 5 watts. The units have been sent in to determine cause of failure and for repairs but I think next time I will make sure all electronics are powered off before getting that close to a transmitter (OUCH!!).
      I am running the same routes in a rental van with the Tri-Band Modem that I normally use the other units on. There is less downtime in the signal gaps I am familiar with and areas where I have had signal problems in both 3G and 4G WiMax are much improved. I have yet to encounter any more 4G LTE signals but am looking forward to the service coming online soon. The unit seems to be running hotter than I would like with a fully charged battery but is actually cooler that the previous Hotspots. The temperature is supposed to soar over the next few days without the cloudiness we have had this past week. So it will be interesting to see if the overheating problems of previous models still occur.
       
      Week 2 – The True test
      The unit is getting worked really hard this week with temperatures outside up near 100 degrees. The GPS is useless with this kind of sun load as the unit will overheat if left in direct sunlight (as the instructions state) in about 20 minutes. The good news is that this is about twice as long as my original Hotspot will last. How anyone can make a unit that requires a clear view of the sky for GPS but can’t handle sunlight is beyond comprehension. A quick check of the Tri-Band’s temperature specs shows that the unit is only rated for 95 degrees. The prior Hotspot was rated well above the century mark but couldn’t even handle 90 degrees for any length of time. The crappiest laptop on the market will handle 105 degrees plus all day long. The true test will be my afternoon calls when the temperatures are high. Battery life has been about 8 to 9 hours which is far better than the prior Hotspots.
      The unit started overheating one afternoon. I can’t say I’m a bit surprised at that, but what is surprising is that it will run steadily as long as the air temp is below 98 degrees. This is a first for Hotspots as they always overheated well before the rated temperature spec. The bad news is the crappy overheat shutdown doesn’t turn off the unit before damage starts to occur, nor does it turn the unit off completely.
      Removing the battery cover seems to help air circulation and overheating some. The button lights are flickering after one overheating but the unit seems to be working fine other than this. It will be interesting to see what happens when it really gets hot here.
      According to the specs 4G LTE takes the least amount of wattage to run so it may not overheat as fast when using 4G LTE. I had the chance to try the modem in the old school 3G EVDO mode as one of my locations is 40 feet underground and that is all that is available at this location. I shut the unit down after 30 minutes as the unit was so hot you could barely handle it even though the temperature underground is around 70 degrees. I would not recommend trying to use this for any length of time if you want the Tri-Band to not overheat!!
       
      My Opinion
      Although Sierra Wireless has made some major improvement in the 3rd generation Hotspot, this is still a unit for the casual user. It is not designed to handle heavy use or outdoor summer temperatures for any length of time. It will be going in my climate controlled cabinet to protect it from the heat next week. I will let you know how it works when the temperature stays below 85 degrees. The improvements in connectivity, reception and stability are worth the investment. As long as you know and adjust your usage for the limitations of the unit.
    • By pyroscott
      Sprint Nextel revealed their second quarter 2012 corporate earnings in a conference call to their investors today and S4GRU was covering for news on Network Vision.
      Network thinning of the iDEN network is complete, taking 1/3 of Nextel towers off air. The Nextel network was built to support 20 million subscribers, but was only supporting 4.4 million subscribers, so it could easily be thinned without [much] noticeable change in street coverage. Sprint also converted 60% of the Nextel subscriber loss into their Sprint subscriber base. Interestingly, they stated that Verizon has been the biggest poacher of subscribers leaving Nextel, grabbing 50% of former subscribers in the last 4 1/2 years. In that same timeframe, Sprint has grabbed 25%, AT&T 20% and T-Mobile 5%.
       
       
      On the Network Vision topic:
      4 additional cities will launch, including Baltimore, by the end of August.*Edit* Cities were disclosed VIA press release following the conference call. They are:
      Baltimore, MD Gainesville, GA Manhattan/Junction City, KS Sherman-Denison, TX  
      Over 2,000 sites are currently online with 12,000 sites to be online by the end of the year
      Network Vision towers are seeing 10-20% additional voice minutes usage per tower, overnight after activating Network Vision. This will equal roaming savings for Sprint, and ESMR will only increase that savings.
      CEO Dan Hesse confirmed that Sprint will be releasing the Motorola Photon Q "in the very near future." It will be a QWERTY slider "with robust business and consumer features." It will also be sporting world phone capability.
      Several hundred Network Vision sites are waiting for backhaul, and will turn on when the backhaul is installed, several hundred more sites have birds nesting on them and Sprint won't be able to turn them on until the birds leave, according to the conference call.
      Sprint sold 1.5 million iPhones during the quarter, even though other carriers saw slowing of sales with rumors ramping up that the new iPhone would support LTE. 40% of the iPhone sales were to new customers. They also stated that iPhone customers require less customer support and are expected to churn less than customers on other phones.
      Mr. Hesse confirmed that Sprint is not looking to change plans in the near future.
      Things are looking up for Sprint. This quarter saw their highest ARPU and their lowest churn rate to date. They posted a larger loss than Q1, but beat their revenue goals for Q2. For more detailed financial information, check the source link below.
       
      Source: http://investors.spr...spx?iid=4057219
      http://finance.yahoo...-141200985.html -Thanks to S4GRU sponsor marioc21 for finding this link!
    • By lilotimz
      Ericsson RRUS31 B25 + RRUS11 B26
      These are the newest and greatest remote radio units to come from Ericsson. 

      The new Ericsson RRUS31  B25 should be fairly distinctive compared to the earlier RRUS11s and now the RRUS12s being deployed by ATT and Verizon. One of these new RRUS31s can do the job of two earlier RRUS11s thus reducing deployment costs for Sprint and complexity in deploying new sites and making it easier for users to spot as there are now 4 jumpers coming out of one RRUS31 rather than two from each RRUS11 that Ericsson originally deployed. 

      All future deployments will be utilizing the new Ericsson RRUS31s. In addition Ericsson are sending crews to their original deployments and swapping out older RRUS11s for these new RRUS31s due to the aforementioned fact that one RRUS31 can do the job of 2 RRUS11s. Weight savings will be significant at sites where there are 4 or 5 RRUS11 B25s that can be replaced by one or 2 RRUS31s. The Ericsson RRUS31 deployment project is known as the 65 Mhz Project. 

       

      Ericsson RRUS11 B26 top and RRUS31 B25 bottom

       

       
      Ericsson High Capacity / 4x4/2 MIMO Deployment
      Note the additional antenna + PCS radio.
      Previously Ericsson utilized additional PCS radios and used RF combiners for high capacity setups where they utilized three or more PCS radios. This new setup will utilize a completey new antenna + radio set just like Samsung and run 4x2 MIMO on the LTE antenna / radio set. 
       

       

       

       
      Ericsson RRUS11 B25 [EOL'd] and B26
      A standard Ericsson Network Vision 1.0 site with 3 RRUS11s where two are dedicated to PCS and one to SMR.  

      This type of setup is no longer deployed or utilized in new sites. Existing sites will be slowly converted to newer RRUS31 B25 via the Sprint 65 mhz project. 


       
      Ericsson NV high capacity site [EOL'd]
      3 or 4 PCS RRUs are present for a total of 4 or 5 RRUS11s per antenna. 


       

       

       
      Close up of Antennas
       

       
      Ericsson cabinets 
      (center)



      All credit to those who took the photographs. They know who they are!
       
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