OT: long range cordless analog phone needed

Discussion in 'Wireless Internet' started by JM, Apr 23, 2007.

  1. JM

    JM Guest

    Can anyone here recommend a good long-range cordless telephone? I've used
    the Engenius SN920 before, but honestly I was not able to get much better
    distance than with a standard cordless. I need one phone for a security
    guard that will be protrolling an outdoor area that's approximately 4,000 sq
    ft (1,000 ft from back to front / 400-500 ft wide). The area is mostly
    open, with some stacks of lumber in unpredictable places - approx 12 ft
    high). Line of site is very good over most of the area. The base unit will
    be placed in a small guard shack, and I can mount an external antenna if

    Advice appreciated.

    thank you,

    JM, Apr 23, 2007
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  2. JM

    John Navas Guest

    Assuming you've already ruled out cellular (e.g, iDEN), have you
    considered 2-way radio (FRS/GMRS) instead?
    John Navas, Apr 23, 2007
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  3. No. The power level is so low, and interference levels so high, on
    most cordless phones, that long range operation is not possible. I
    recently helped shut down an illegal high power 2.4GHz phone system
    running about 1 watt output. Despite the high power, the range was
    erratic in the downtown area because of severe interference from other
    system. 900MHz would have been worse. 5.8GHz might work until they
    too become upbiquitous.
    I borrowed a pair of SN920 Ultra's about 2 years ago. It was really
    weird. Sometimes, I could talk easily between my house and downtown
    Ben Lomond, a distance of about a mile through a mess of redwood
    trees. However, it was totally unreliable. It would be working just
    fine and then just disappear. A few minutes later, dialtone would
    magically reappear, eventually followed by another disconnect. The
    2nd unit seemed a bit better, but I had to return everything before I
    had time to try any long range testing.

    However, 500ft radius coverage should not be a problem with this unit.
    It should have worked. Perhaps you had quite a bit of 900Mhz
    interference in the area?
    A cordless phone is inappropriate and unreliable. What you want are
    licensed commercial radios on one of the "dot" frequencies. 1,000ft
    is no problem for these on either VHF or UHF. Surplus radios are
    cheap and commonly available. For 1000ft, two UHF HT's and rubber
    ducky antennas are fine.

    Radio to phone patch interfaces are commonly available. For example:
    However, you're not going to get full duplex operation to the
    telephone. The HT can only transmit or receive, one at a time. If
    you want something resembling good telephone operation, the base
    station will need to be full duplex. That means you'll effectively
    need to build a repeater at the base, which seriously raises the cost,
    and requires a different FCC license. The usual solution is to use a
    cell phone for telephone calls, and the two way radio for talking to a

    Talk your neighborhood two way radio dealer.
    Jeff Liebermann, Apr 23, 2007
  4. JM

    News Guest

    You don't say where this will be used, but that style of "long range"
    phone is not FCC approved for use in the US.
    News, Apr 23, 2007
  5. We operate on a 10-acre site with widely spaced buildings. The EnGenius
    922H (Duraphone-4x) gives us solid communications all over the 660 x 660,
    and all the way over to our two adjacent properties that are over 700' from
    the base unit.

    The base is inside a metal-skinned prefab office, with no external
    antenna -- just the two rabbit ears that are stock on the unit. We're told
    that with a higher-gain outdoor antenna, we could roughly triple the range.

    Lloyd E. Sponenburgh, Apr 23, 2007
  6. Did the sn920 have an external omni? An old uniden 900mhz cordless became
    quite reliable and it was only pushing a 1/10th of the output the sn920

    (down bush = around a mile thru coconut trees)

    Forster Tuncurry, Apr 23, 2007
  7. JM

    JM Guest

    Sorry I didn't clarify: I've used the Engenius SN920 before, but *not* in
    this particular application. Perhaps it deserves a second look, considering
    the open space?

    JM, Apr 24, 2007
  8. JM

    JM Guest

    is the Durafon supposed to provide longer range than the SN920?

    JM, Apr 24, 2007
  9. JM

    JM Guest

    I'm sorry i did not clarify: I've not tried the SN920 in this particular
    application. I was hesitant to order one, simply because in another similar
    application I was only able to get clear reception up to approx 700', and I
    really need coverage over a lot that is 1000'-1200' at its deepest point.

    JM, Apr 24, 2007
  10. Your antenna is one of the main factors for range and clear reception. Get
    your base up high with its stock antenna could be all you need tho.

    The position of your base in the last setup would have been a key factor.

    Forster Tuncurry, Apr 24, 2007
  11. JM

    JM Guest

    I agree with that. The base unit last time was two walls deep into the
    building, positioned on a desk.

    So you think with correct positioning in the small guard house I can get the
    coverage I need?

    JM, Apr 25, 2007
  12. JM

    JM Guest

    I have, but the customer's primary motivator is getting the cordless phone
    to be part of their current PBX (a Nortel). They want any 911 calls to show
    their company name and address, and they want the guard to be able to
    receive phone calls that come through their system. They want the cordless
    phone to be an extension off their system.

    JM, Apr 25, 2007
  13. Even a small home brew antenna would do the job. The base and handset have a
    healthy output no reason why it couldn't do the job.

    Forster Tuncurry, Apr 26, 2007
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