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Boosting the Cellular Signal, Inside?

Posted by Cliff on from the can-you-hear-me-now? dept.

Ryan Black asks: "I live in a suburban area where cellular signal strength is not what it should be. I am a Verizon customer, and while they have been courteous in addressing the issue, they have not been able to fix the situation. Is it possible to create a sort of cellular repeater to attach to the roof of my house? The signal outside is acceptable, it just cannot penetrate the walls of the building."

21 of 38 comments (clear)

  1. two solutions by austad · · Score: 5, Informative

    There are a couple of ways you can go about it.

    One way is to buy something called an active repeater. It has an amplifier, and can amplify signals both coming into and exiting the house. Do a search on google for gsm active repeater. I looked into this for one of my remote offices. Cost was around $1500, which is probably more than you want to spend for your house.

    Another option is a passive repeater. Basically just an antenna outside, and another inside. No amplifier. However, I'm not fully sure how well these work. I purchased one which claimed it worked for my frequency, but it didn't do a damn thing. If you do this, make sure you buy from some place that looks reputable. Otherwise, there are antenna sites that tell you how to tune antennas to certain frequencies, and if you wanted to do some research, you could probably build your own.

    In all reality, you could probably build your own active repeater also, and base it on the design of one of those cable tv amps that work with cable modems, they boost both ways. Of course, you'd have to spend like $80 and rip the thing apart and figure out how to change the range that it works in.

    --
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    1. Re:two solutions by Minupla · · Score: 3, Informative

      Also be aware that doing some of these things may place you in violation of FCC type compiance rules if you do it yourself, without appropiate FCC licening and testing. I am unsure of the rules and regs outside the ham frequencies, but you might wanna look into, to ensure you're under whatever the max radiated power for the frequencies involved. Having said this, there is a fair bit of home brew info for both active and passive repeater systems available, and the theory on that stuff should point you in the right direction for handling the shorter wavelengths (higher freq) involved in gigahertz frequency work.

      --
      On the whole, I find that I prefer Slashdot posts to twitter ones because I don't get limited to 140 chars before
    2. Re:two solutions by Chanc_Gorkon · · Score: 2

      Except he said he is with Verizon. They are CDMA as far as I know and not GSM. At least that's what the one phone I saw that had anything about the network on it said. Saying that, in my house, I have good reception. At work, I only have 2 lights, at home I have a full meter. I guess Verizon's service is better in my area then in some areas.

      --

      Gorkman

  2. Sure ;) by Discoflamingo13 · · Score: 3, Funny

    I think it's called a Faraday cage. They have one on a building at MIT.

  3. Similar problem. by blues5150 · · Score: 5, Informative

    I use my cell phone as my primary phone. My problem is that the reception inside my house is poor. The signal outside is a lot better. I Googled this cell reception idea a bit. The best site I found was Cell Antenna. The also have another site called Boat Antenna. which specializes in providing signal boosters for boats. The hardware is pretty much the same on both sites.

    --

  4. get an antenna outside by KarlH420 · · Score: 3, Interesting

    On my cell there is an antenna connector on the back. I hook up to it while in my car. It considerably improves the signal. I've tried the antenna inside, and it also works well. You should be able to purcase an antenna accessory for your phone.

    1. Re:get an antenna outside by josquint · · Score: 2

      Bascially exactly what I did, just used one of those larger magenet mount antennas for cars, and ran athe cable into the house and to the phone.

      Biggest drawback is, it basically makes it a corded phone.

      They're passive, but if the signal is good outside, its just like having the phone outside. And its cheap, like 15-20$

  5. Two solutions... by shepd · · Score: 2

    Best.

    Cheapest

    This + Call Forwarding = Easiest.

    Suggestion: You can find out more by asking the "You've got questions, we've got blank stares" salesclerks. They are actually overqualified for this question, but I'm sure they can take a moment out of this busy stereo and computer selling season to help you for a moment. Or you could simply Ask Google next time.

    Either of these should get your answer much faster than Ask Slashdot. :-)

    HTH.

    --
    If you could be told what you can see or read, then it follows that you could be told what to say or think - BoC
  6. gsm by Zephy · · Score: 2, Interesting

    I don't know if it'll work with your cdma style phones over there, but here in the uk some mobile operators will install repeaters for you (we in our offices use o2/cellnet for our mobile services, and since inside our building has poor reception , they installed a repeater ). I think it is fairly expensive though, but effective ( i get full signal strength inside a building that is essentially a block for most other networks' signal.

    1. Re:gsm by Chanc_Gorkon · · Score: 2

      Not all phones in the US are CDMA anymore, although Verizon is. GSM is making a huge push alond with iDen (Nextel). iDen may not have the most exciting phones, but everyone I know of in business uses them because of the Direct Connect feature.

      --

      Gorkman

  7. Re:whos the dumbass... by _Spirit · · Score: 3, Informative

    My phone (Nokia 7110) has a jack for an external antenna, most phones sold here (Netherlands) do, mostly to be able to use an outside antenna on your car. When I put my phone into the handsfree kit, it automaticaly jacks into the external antenna as well. It would be trivial to set this up at home. You would lose the cordless functionality though. In my car I sit in the same spot all the time(well most of it, I do escape from traffic jams and actually arrive somewhere every once in a while ;-) ) and I am not allowed to hold the phone in my hands so the physical connection isn't an issue. At home I tend to walk around alot while I'm on the phone.

    I am not sure if these external antenna kits are readily available in the US as I noticed the last time I was there that most people prefer to hold the phone in their hands. That's one of the differences I saw between Europe and the US. In Europe a driver is defined as the person driving the car. In the US the driver is considered to be the person who got into the seat that has the steering weel in front of it. Is there anything you guys don't do while driving ?

    --

    beauty is only a light switch away

  8. Re:Dumbass by krinsh · · Score: 2

    Actually I have to really, really contradict this. In my area the landline reception is shoddy and full of interference on a good day [and that's plugged right into the line; not on a cordless]. The guys here have a point about using their cell phones all the time - my wife and I are experimenting with replacing our land line with two cell phones - it is a lot cheaper all around and we use cable for our internet so we don't need it - not to mention we've just removed a major inlet for telemarketers and other annoying calls in the evening - especially if we turn the phones off when we're together. Add the first tone of the 'line disconnected' message to your cell's voicemail and you've freed yourself from a lot of ordinary household telephone constraints [even if you don't get 3 or 4 Blockbuster coupons for your outrageous long-distance bill to the in-laws' house an hour away].

    --
    I think with the interesting people, their lives can't possibly be wrapped up into a nice little package.
  9. Re:whos the dumbass... by david+duncan+scott · · Score: 2

    Shower, although I have been known to clean my hands and face with a WetNap while driving.

    --

    This next song is very sad. Please clap along. -- Robin Zander

  10. Spotwave's SpotCell by mTor · · Score: 4, Interesting
    Spotwave has a product called SpotCell and we use it at a building where I work. We had an absolutely awful cell coverage because our offices are really high up. After they installed one of the SpotCell devices, cell phones actually started to work again.

    Ask them for a demo!

    Check the FAQ... here's a part relevant to your question:

    I work in an office building where my cell phone coverage in certain areas, including my office, is non-existent or spotty at best. How can I improve my coverage?

    The requirement for reliable, always-on cell phone coverage within the office environment is increasing dramatically. It is not unusual to encounter trouble spots within a building where cell phone signals are weak or non-existent. SpotCell provides affordable and clear coverage to those trouble spots. The unit can be easily deployed and provides a coverage range of 15,000 to 50,000 square feet (2,000 to 4,600 square metres). Multiple units can be easily deployed to cover office areas and working locations. SpotCell can be deployed even without access to the roof or outside.

  11. I suppose this is the non-technical way, but by cinder_bdt · · Score: 2, Interesting

    I had the same problem. I switched to the "America's Choice" plan, which is a bunch of roaming agreements with other carriers, and now I don't have low signal strength in my house. Apparently I'm close enough to someone else's cell site that I'm "roaming" in my house. My bill actually went down, too.

  12. Here's how to fix it ... by nbvb · · Score: 3, Insightful

    Get more people in your area to complain (nicely).

    If VZW gets more than a few inquiries about cell signal in the same area, they'll send out one of those Test Guys (yes, they really _DO_ exist) in a car that looks like a porcupine to test the signal. Then they can adjust and/or add transmitters as appropriate.

    Other things to note:
    #1 - You need to convince your town council/zoning board/whomever that YES adding a cell transmitter is a good idea and NO it won't irradiate their children. Anyone with even a fundamental understanding of derivatives (any RF engineer) can explain why it is that the amount of RF output drops exponentially as you move away from the transmitter. Within a few feet, you're well within FCC limits. The NIMBY yuppies (Not In My Back Yard) folks are usually the ones screaming "YOU'RE IRRADIATING MY CHILDREN!!" at the town meetings, then b*tching up a storm in their Ford Extravagance when they can't make a cell call because they wouldn't let the cellco's put towers within 20 miles of them! Cellular towers are perfectly safe ------ just do the math!

    #2 - You also need to not only let VZW know there's a problem, but get your neighbors to do so also. If there are any businesses in the area that have folks who use cells (sales forces, etc.) make them call too. We all have to remember that as important as it is to have great cell reception in your house, you also have to weigh the cost factor in. Transmitters ain't cheap. That's why you need your neighbors & businesses to call.

    It's not that they're thinking "well, it's only one guy, screw him", but rather "How do we justify spending $20,000 to boost one customer's signal? We'll _never_ make a return on that!"

    If you get some more people to complain, all of a sudden it's no longer a loss..... :)

    Again, just like RF signals, it's all about the math.... :)

    --NBVB

    1. Re:Here's how to fix it ... by mph · · Score: 2
      Anyone with even a fundamental understanding of derivatives (any RF engineer) can explain why it is that the amount of RF output drops exponentially as you move away from the transmitter.


      I wouldn't trust an engineer who thinks that.

      (First, output is output, and doesn't depend on where an observer is. Second, received power per unit collecting area does not decrease exponentially.)
    2. Re:Here's how to fix it ... by nbvb · · Score: 2

      OK, I guess I worded that wrong. Output _is_ output. What I MEANT to say is that one's exposure to RF drops off exponentially over distance....

      --DM

    3. Re:Here's how to fix it ... by mph · · Score: 2
      What I MEANT to say is that one's exposure to RF drops off exponentially over distance....
      That was the second point that I addressed. The fall-off is not exponential. There's a reason it's called the "inverse square law."
  13. Timing, not. Linearity, yes. by Andy+Dodd · · Score: 2

    Unless your amplifier is horrible it's not going to do anything to the timing of the CDMA signal... It may delay it, but that's the same effect as walking away fromt he base station.

    On the other hand, CDMA uses some neat tricks to overlay numerous signals on one channel. The one disadvantage of this is that it requires extreme linearity for any amplifier the signal passes through, otherwise the multiple CDMA carriers will garble each other.

    Not that I'm complaining, solving nonlinearity problems in power amps is what keeps my company in business and the paychecks coming. :)

    --
    retrorocket.o not found, launch anyway?
  14. Here by anthony_dipierro · · Score: 2

    Connect your cell phone to every phone in your home or office