can anyone suggest an antenna?

Discussion in 'PC Hardware' started by emekadavid, Aug 8, 2012.

  1. emekadavid

    emekadavid Guest

    good day, I am looking for a way to connect to networks using this modem on my system; it is on COM1. just discovered it myself:
    https://www.linuxquestions.org/ques...ing-what-this-ttys0-reading-means-4175420805/
    I would prefer something, possibly an antenna that:
    1. is a point-to-point link to a high speed link.
    and/or
    2. can bridge to a wireless network like wifi! possible? i believe it is. radio.
    please, i will be happy to have links or suggestions.
    tnx
     
    emekadavid, Aug 8, 2012
    #1
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  2. emekadavid

    David Guest

    You don't have a modem. A 16550A is a serial port.
     
    David, Aug 8, 2012
    #2
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  3. emekadavid

    emekadavid Guest

    thanks. that's why i posted the linuxquestions.org link. thought so.
    is a serial modem that interfaces with a wireless line possible? thought i saw something but you techies know better.
    thanks
     
    emekadavid, Aug 8, 2012
    #3
  4. emekadavid

    Paul Guest

    You say in the Linuxquestions thread, your model number is Compaq TC4200.

    Is this the machine ?

    http://h18000.www1.hp.com/products/quickspecs/12138_na/12138_na.HTML

    RJ-11 Port (Modem) <--- Connect to phone line, for dialup networking
    This means the modem is inside your computer already.

    RJ-45 Port (NIC) <--- Connect to ADSL modem or cable modem, for broadband

    Optional integrated 802.11 a/b/g Wifi <--- Wireless connection to home router

    Bluetooth Module (optional) <--- Suitable for wireless PAN or connection to
    tether style networking, say 3G or 4G ???
    This would not be my first option.

    USB <--- You could connect a USB dialup modem if you want.
    You could connect a USB to Ethernet (RJ-45) if you want.
    Some routers even have a USB port.
    This would not be my first option either.

    In summary, that particular model has lots of options. And the built-in
    dialup modem and RJ-11 port is the one you'd try first.

    If the machine is that modern, you could try "lshw" to get more info
    about what is inside. "sudo lshw" runs the utility as root. Using
    "man lshw" will tell you more about it. If lshw is not installed,
    the shell may even tell you what command to issue, to download
    the executable.

    Other programs are "lspci" and "lsusb", but "lshw" gives about as
    comprehensive a list as Device Manager in Windows would give you.

    Dialup networking in Linux, would involve PPP protocol as it would on Windows.
    In this example, they used two packages, "wvdial" and "ppp". And
    a lot of little config file changes. This tutorial is from 2001,
    before better tools were available. Now, I understand there is a
    "Gnome PPP", as well as "KPPP" for KDE. Modern distros also have
    the accursed Network Manager, which can trash a perfectly good
    network connection. And there are also control panels, for
    selecting networking options, which may ease the setup of the
    PPP dialup session. I wouldn't delve into a lot of script files,
    unless the "automation" in your distro has failed. Modern
    distros should be better at this, than the old distros where the
    amount of work would be similar to the description in the
    next link.

    http://www.linuxjunkies.org/html/Modem-Dialup-NT-HOWTO.html#s2

    You should try to get the distro to identify the dialup modem
    for you, rather than drilling into "dmesg", looking for /dev/ttyS0
    and the like. The hardware discovery that the OS does at boot
    time, should have passed sufficient device info to Network
    Manager, for the appropriate icons to be present to select
    dialup graphically as a networking option.

    And you don't have to use dialup. It's just the direction
    you headed initially, suggested you wanted dialup networking.
    But that computer has plenty of options. If you have ADSL or
    cable modem/router with Wifi, you should be able to use
    Wifi from the TC4200 to those equipments. Or even an
    Ethernet cable in the RJ-45 hole.

    HTH,
    Paul
     
    Paul, Aug 8, 2012
    #4
  5. emekadavid

    emekadavid Guest

    thanks. bookmarked
     
    emekadavid, Aug 8, 2012
    #5
  6. emekadavid

    emekadavid Guest

    I am happy that the detailed support from this forum. I have decided to buya wifi antenna for networking. I need something that can go large distances, like 10km approximately; I need it for networking practice on my linux laptop, especially the inbuilt ip tool. can anyone suggest an antenna for me..
    will something like this be adequate, i saw it at tigerdirect. btw, I need something that will not tear a hole in my budget, less than 50 dollars.
    http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=195213&csid=_61
    thanks everyone. your support has been wonderful.
     
    emekadavid, Aug 12, 2012
    #6
  7. "emekadavid" implored:
    Hmm..., 10km ~ 6.2miles. Ya gotta remember that in open terrain,
    the signal strength of a vertical "whip" (antenna such as pictured) drops
    proportionally with the SQUARE of the distance from the antenna. At
    6.2 miles, y'aint gonna get a signal receivable by a retail receiver. Since
    the wavelength in the 2.5GHz range is around half a meter, you might try
    using what I think is known as a "BOD" (a "big old dish" from the days
    before 18" satellite dishes) as a big ol' reflector to beam the signals.
    Or maybe use a collander as the (approximately parabolic) reflector.
    Another tack is to build your own Yagi antenna using designs and
    dimensions calculated from books available from AARL (American
    Amateur Radio League, i.e. the ham radio operators). Such an antenna
    would be smaller (due to the high frequency) than a UHF TV antenna.
    Here's such a Yagi antenna dimensioned for those frequencies:
    http://www.ebay.com/itm/Long-Range-...694?pt=LH_DefaultDomain_0&hash=item4156e3665e
    Or... buy a pre-made reflector antenna such as this one for $40 (but you'll
    need two, and the range is only about 3 miles).
    http://www.ccrane.com/antennas/wifi-antennas/point-to-point-wifi-antenna.aspx#.UCf7e6OQP8k

    You'll also need a steady mount for the antennas and some way
    to know whether the signal is on target. This project will definitely
    require some study and research.

    *TimDaniels*
     
    Timothy Daniels, Aug 12, 2012
    #7
  8. emekadavid

    Paul Guest

    Wifi is at microwave frequencies. So you could look at microwave techniques.

    http://www.radiolabs.com/products/antennas/2.4gig/stage1.php

    Antennas come in vertical, horizontal, or circular polarization.

    http://en.wikipedia.org/wiki/Polarization_(antenna)#Polarization

    The Wifi protocols, are designed with a certain maximum distance in mind.
    In the experiments done in South America, they've sent Wifi a couple
    hundred kilometers, between mountain tops. But to do so, requires
    modifying the Wifi software, so the protocol doesn't time out. You'd
    have to review that issue, to understand what distance to expect
    under good propagation conditions (before software becomes an issue).

    See the fun you can have ?

    http://www.engadget.com/2005/11/15/how-to-build-a-wifi-biquad-dish-antenna/

    If you don't like the dish idea, they also make Yagi. They're used
    for television. But can also be "cut" for a fixed frequency,
    rather than being broadband. A TV Yagi, is meant to span channels
    13-83 for example, which is a huge range of frequencies. If you use
    a Yagi designed for a relatively fixed frequency (covering the
    channel spacing of Wifi), then the antenna could have slightly better
    gain. Generally, the lower the bandwidth, the better the gain in
    the remaining frequencies. At least, with OTA digital TV showed up,
    antenna designers hoped to gain a bit, by not having to make the
    antenna go up as high in frequency.

    http://www.radiolabs.com/Articles/wifi-antenna.html

    In a quick check, the Yagi Wifi antennas are in the 16-25 dBi range.
    One reason for that, could be the Yagi is "front and back fire", while
    the microwave dish only fires in the front direction (no back lobe).

    The benefit of an extremely directional antenna, is you can actually
    avoid interfering Wifi signals from other compass points. You
    can point right at your partner Wifi device. To do so accurately,
    you might need GPS at both the originating site, and GPS in the
    field, so you can work out the true bearing, then correct for the
    compass bearing, and then using a locally held compass, get some
    idea where you should be "pointing". There is a difference between
    "magnetic" bearing and "true" bearing. The sites I've used for OTA TV,
    provide that information for me. They tell me the "true" bearing, and
    then what I'd need to use when using my compass for aiming purposes.

    Considering you're on a budget, I'd take my time before deciding
    what antenna to buy. And also, what the reasonable expectations would be
    for performance.

    Have fun,
    Paul
     
    Paul, Aug 12, 2012
    #8
  9. emekadavid

    Allen Drake Guest

    That antenna will not increase your Wi-Fi range by 6 miles. You will
    be lucky if you get an additional 60 ft.

    I got good range from using 2.4G wireless transmitters and receivers
    but no where near your desired range. I did, however, take out my
    whole street leaving my neighborhood and beyond with no Wi-Fi
    connectivity what-so-ever. Some had no phone and brought an end to
    those online gamming activities for God knows how many months before I
    or anyone knew what was going on. Now that everything is back to
    normal I am hearing of many others that angrily changed providers,
    bought new routers and laptops and still had no idea what was going
    on.

    I had an idea that I might have been the cause while I had no
    trouble. I told the pole climbers that thought I knew what the problem
    was and to stop by to see me when they were unable to fix things. None
    ever came to see me, after all, what could I possibly know?

    Finally I spoke to the new guy setting up VOIP for the guy next door
    and asked him to se me when he was unsuccessful. We tested each
    transmitter I had(8) and each was causing the interference.

    Anyone want to buy one of these?

    http://www.amazon.com/2-4ghz-Wireless-Sender-Transmitter-receiver/dp/B006WH6XNI


    Al.
     
    Allen Drake, Aug 12, 2012
    #9
  10. emekadavid

    Mike Easter Guest

    That omni antenna at Tiger Direct can replace an external wireless
    antenna which is connecting to its wifi radio by way of a RP-SMA
    http://en.wikipedia.org/wiki/RP-SMA#Reverse_polarity_SMA

    It would have more gain than a little stubby external but nothing like
    what you are imagining.

    In linuxquestions, you announced a compaq tc4200

    Paul asked you if this HP Compaq tc4200 Tablet PC was your laptop.
    http://h18000.www1.hp.com/products/quickspecs/12138_na/12138_na.HTML

    If so, your tablet's wifi does not have such an external antenna connector.

    You are connecting to this newsgroup via GG using different/variable
    Nigerian providers.

    What does that mean about your connectivity plans? You are wanting to
    use your tablet's wifi to connect to a far off wifi access point.

    It would be better if you spelled out/ explained in much greater detail
    what kind of intentions you have and what kind of connectivity is
    available to you.

    If a person has 'control' of both ends of the radios and their antennae,
    the access point and the receiving/client device's antenna, they could
    devise a cheap uni-directional antenna such as has been made with
    Pringle's cans and other similar shapes which are referred to as cantennas.

    http://en.wikipedia.org/wiki/Pringles_cantenna
     
    Mike Easter, Aug 12, 2012
    #10
  11. emekadavid

    emekadavid Guest

    Good day. Whoever has been following my new topics recently will realize that they are all connected towards networking. I intend investing in networking education for this year and next and presently reading series of books on computer networks, including the Linux networking guide.
    My purpose after my studies is to:
    1.Understand networking in its complete sense.
    2.Start a networking training institute because I believe the need is slowly arising in my country, Nigeria, for networking resources.
    I have a concern though. I went to the market and found that the modems that are popular are these:
    a.Wifi modems but the problem is that the range is very short and I could not find a range extender in the marketer, so it would be close to impossible detecting any wireless network with it.
    b.HSPA/3.5G/UMTS modems. I have never used this before and they require a SIM card installed.
    My short-term goals:
    1.To be able to tune my Linux system to act as a networking router, bridge or access point. The complete works.
    My question is:
    1.Given HSPA/3.5G/UMTS modems that require SIM cards, is this short-term goal possible?
    2.Given Wifi modems and not being able to detect any network with it for short-term goals above, is there a workaround?
    thanks
     
    emekadavid, Aug 14, 2012
    #11
  12. emekadavid

    Mike Easter Guest

    I have only been following this one topic of yours in this one group.

    There are several issues in your messages here which are not related to
    the group's name. One is the format of your messages and the other is
    the issue of connecting to a provider as opposed to creating a local
    network.

    You are reading and posting to this usenet group using google groups GG.
    The best way to read and post here is not with GG but by using a
    newsreader and newsserver, both of which are free.

    GG has a new and an old interface. The new interface causes your
    messages to be posted in a bad format, the lines you quote are
    double-spaced and the lines you write are not properly wrapped.

    Popular news readers for windows are Thunderbird for Win7/Vista/XP or
    Windows Mail for Vista or Outlook Express for XP. Popular news servers
    are aioe which does not require registration or eternal-september which
    does.

    Re Nigerian providers: I see a number of web sites about internet
    service for Nigeria and the role of satellite and cybercafes.

    It is one thing/problem to achieve internet connectivity via a provider;
    it is another thing to create a local network with ethernet or wifi or
    both. It appears that you do not have a consistent connection with a
    single Nigerian provider.

    You can have a local network which isn't connected to the internet, or
    you can have a local network which /is/ connected to the internet.

    How you study for your future plans is somewhat ahead of how you
    currently connect to the internet and how you connect to this usenet
    newsgroup.
     
    Mike Easter, Aug 14, 2012
    #12
  13. emekadavid

    emekadavid Guest

    was having some issues posting on GG using the web interface this morning. didn't really understand the new layout. getting used to it. sometimes, GG is more intuitive than other newsreaders but was thinking of installing one.
    thanks anyway.
     
    emekadavid, Aug 14, 2012
    #13
  14. emekadavid

    Mike Easter Guest

    If you are going to use GG, you should/must use the old interface or
    else you have to do a lot of reformatting to make acceptable news messages.

    You get to the old interface by using the gear menu and selecting
    'revert to the old interface'.

    If that revert function is not available in the menu, log out and go to
    the old interface front page https://groups.google.com/

    and log back in. If you get redirected to a new GG, notice what address
    is in the addressline of the browser and edit it to say:

    https://groups.google.com/?hl=en&noredirect=true

    That 'noredirect' in the URL prevents the GG webserver from redirecting
    you to the new GG front page.
     
    Mike Easter, Aug 15, 2012
    #14
  15. emekadavid

    Mike Easter Guest

    If your OS is Win XP, Outlook Express is installed by default.

    If your OS is Vista, Windows Mail is installed by default.

    Both of those make satisfactory news clients to start. Win7 is another
    matter as it does not have a news client.

    Then all you need is a newsserver. eternal-september is free and/but
    requires registration.

    http://www.eternal-september.org/RegisterNewsAccount.php?language=en
    User registration

    You choose a username and e-s will send you a password which you can
    change at e-s at any time.

    These pages at another different news server NIN give good illustrations
    about how to set up your news client of choice

    http://news.individual.net/config.php Program Configuration

    You can use the guides at NIN, substituting the values for e-s insetead
    of those for NIN.
     
    Mike Easter, Aug 15, 2012
    #15
  16. "Mike Easter" mentioned:

    True about Win7 not having a news client. But Windows Live Mail,
    the successor to OE and WinMail, can be downloaded from the Microsoft
    website, and it behaves pretty much like Outlook Express and Windows Mail.
    You just have to be careful to download just Win Live Mail and not all the
    other Win Live Crap. If you accidentally download and install the entire
    collection of Win Live apps, you can get rid of them individually by starting
    the procedure to uninstall the entire collection, and then selecting each of
    the undesired apps individually in the next step.

    *TimDaniels*
     
    Timothy Daniels, Aug 15, 2012
    #16
  17. emekadavid

    Mike Easter Guest

    The version WLM you refer is totally unacceptable as a news client
    because it cannot quote/cite with quote marks.

    The only usable WLM is a 2009 WLM which can be found a few places.

    It is also possible to get the Vista Wimdows Mail working in Win7.
     
    Mike Easter, Aug 15, 2012
    #17
  18. "Mike Easter" denigrated Win Live Mail:

    The Win Live Mail to which I refer is the version that I use right now
    which came with my Dell OEM 64-bit Win7 two years ago (of which
    there are later versions) and which cited your quote above. Admittedly,
    it didn't include quotation marks, but I most people wouldn't consider
    that as a shortcoming in a news client.

    That you are able to exorcise WinMail from Vista and transplant it
    to Win7 is impressive. I tried uninstalling WinMail from my laptop's
    32-bit Vista, and it wasn't even listed at being installed.

    *TimDaniels*
     
    Timothy Daniels, Aug 15, 2012
    #18
  19. emekadavid

    Mike Easter Guest

    Timothy Daniels wrote:
    X-Newsreader: Microsoft Windows Live Mail 14.0.8089.726
    Your LWM 14 is a version which quotes but current versions don't. A
    news agent which doesn't quote isn't a news agent that can post anything
    to a newsgroup but an initial thread message.

    The absence of proper and compliant progression of all the previous
    quotes creates a totally unacceptable reply -- in a different way than a
    GG-new unacceptable reply.
    I read somewhere that MS originally intended (and structured) for
    WinMail to be a part of Win7, but the European rule-makers didn't want
    to allow it, so WinMail was 'disabled' in the released Win7.

    I have never tried to remove WinMail from a Vista
     
    Mike Easter, Aug 15, 2012
    #19
  20. For the sake of G00gle archives, let me correct my statement about the
    signal falling off with square of the distance from the transmitting
    antenna. That is only true for an infinitely long vertical antenna, i.e. one
    that approximately as tall as, or taller than, the distance to the receiving
    antenna. For short vertical antennas (shorter than the distance to the
    receiving antenna) which are outdoors, the signal falls off with the CUBE
    of the distance. That means that one would have to use a very directional
    antenna, one with a very narrow and concentrated beam, for both
    transmission and reception - which suggests yagis, parabolic reflectors,
    and "cantennas" (as Mike Easter has mentioned). Aiming the antennas
    accurately can be a pain to setup and maintain, and doing it without
    instrumentation could make it a major time waster. One could probably
    get a handle on what is involved by consulting the publications and
    forums devoted to ham radio and by contacting the ARRL (Am. Radio
    Relay League).

    *TimDaniels*
     
    Timothy Daniels, Aug 15, 2012
    #20
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