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Baseband seems enough, why RF at home?

Discussion in 'Electronic Design' started by boki, Oct 12, 2004.

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  1. boki

    boki Guest

    Dear All,
    These days I try to implement some baseband remote control, I
    was feeling that is possible to complete control home devices within
    baseband communications,


    Why RF? for distance?

    Why Bluetooh? for handshake?

    Why? Does it is the essential for giant to unconquerable?

    Best regards,
    Boki
     
  2. Dbowey

    Dbowey Guest

    Why not?
     
  3. By this I assume you man by "Baseband" as non modulated carrier, low
    frequency type stuff.
    You cant get any radio waves with a short antenna at low frequencies.
    Secondly, if you could, the authorities wouldn't allow you to.
    Because its set at frequencies and uses a method that the authorities
    will allow your to use unlicensed. End of story.


    Kevin Aylward

    http://www.anasoft.co.uk
    SuperSpice, a very affordable Mixed-Mode
    Windows Simulator with Schematic Capture,
    Waveform Display, FFT's and Filter Design.
     
  4. boki

    boki Guest

    RF is expensive.

    Baseband much cheaper, isn't it?

    For home device control, the funtion is the same.

    Best regards,
    Boki.
     
  5. Dbowey

    Dbowey Guest

    boki posted:

    << (Dbowey) wrote in message
    RF is expensive.

    Baseband much cheaper, isn't it?

    For home device control, the funtion is the same.
    Subjective terms like expensive and cheap are subject to broad interpretation.


    An RF link with an Ethernet interface may have the same price as an RF link
    with an analog or digital baseband interface.

    It appears to me that you may be using "baseband" to mean a "metallic
    connection" (cable such as Cat 5). In that case, where two equipments are in
    easy connection range of a cable, Cat 5 is certainly less expensive than an RF
    link. But I recently set up a wireless system for a grand daughter in her home
    because it would have been difficult to run cable. Although the equipment cost
    more than a piece of cable, It cost less than the value of time, whether I did
    the job or farmed it out.

    Also, I enjoy the freedom of wireless - I can be anywhere in the house or
    outside without trailing a cable. That has a value making it cheaper than a
    metallic connection.

    Don
     
  6. Wlan Joe

    Wlan Joe Guest

    Hi,
    For distance and ... for cost. These days it became cheaper to put in
    WLAN equipment rather than laying down cable. On top, at least my wife
    was happy that I did not ruin our living room by running CAT5 cables
    along the wall (the "partner aceptance level" is higher :->).
    Bluetooth is not really good for home control - most devices are only
    good for a couple of meters. WLAN seems better - longer distances and
    higher throughput.

    I bought myself some WLAN modules from Avisaro (www.avisaro.com) and
    enjoy now a 'networked' home. Try to reach them via email -
    - their website is in German, but they do speek
    English. I had a WLAN anyway to share my broadband internet
    connection, know I can control lights, shades and heating from my PC
    and from remote sites as well.

    have fun,
    Joe
     
  7. WLAN :
    It is considered a necessity to be able to download the SPAM
    everywhere all the time. Unwary system administrators appreciate
    when strangers occasionally use their private network for
    internet access.

    Bluetooth was invented to occupy the 2.5GHz band with trivialities,
    but at the same time all electronics devices have to withstand
    these frequencies as well as not radiate them. This can put the
    able designers at an advantage. Plus every other designer had to
    purchase a new spectrum analyzer to do the measurements.

    Luckily, we can just rise the prices to cover the expenses.
    :)

    Rene
     
  8. boki

    boki Guest

    I don't know what is your low-frequency definition, and I think it is
    very ok to transmit audio in non-RF enviroment.

    I don't think RF main reason is for short antenna.

    A method ? Nobody need to apply a 'method' to use Bluetooth frequency.


    That version of story is for children.

    The true story is ===> Standard is money gate that controlled by
    giants.

    Best regards,
    Boki.
     
  9. Boki

    Boki Guest

    For "Home device control", RF is expensive. : )

    Best regards,
    Boki.
     
  10. Dave VanHorn

    Dave VanHorn Guest

    You cant get any radio waves with a short antenna at low frequencies.
    nRF2401 works nicely, or for baseband, look up inductive loop signalling.
    A simple pickup coil will get the signal anywhere in the loop, and not at
    all, outside.
    Museums use this for audio programs that run in each room, with no
    spillover.
    The receiver is dead simple, a coil of wire, and an amplifier.
     
  11. Boki

    Boki Guest

    For Kevin,
    How is the weather there? still raining? it is so sad.

    Say hello to your umbrella.

    Smile :D

    Be good.

    Best regards,
    Boki.
     
  12. Dbowey

    Dbowey Guest

    Boki posted:

    "For "Home device control", RF is expensive. : )

    For controlling appliances, etc., look into CEBUS.

    Don
     
  13. boki

    boki Guest

    Hahaha..

    Excellent!

    Best regards,
    Boki.
     
  14. Wlan Joe

    Wlan Joe Guest

    Hi,
    For distance and ... for cost. These days it became cheaper to put in
    WLAN equipment rather than laying down cable. On top, at least my wife
    was happy that I did not ruin our living room by running CAT5 cables
    along the wall (the "partner aceptance level" is higher :->).
    Bluetooth is not really good for home control - most devices are only
    good for a couple of meters. WLAN seems better - longer distances and
    higher throughput.

    I bought myself some WLAN modules from Avisaro (www.avisaro.com) and
    enjoy now a 'networked' home. Try to reach them via email -
    - their website is in German, but they do speek
    English. I had a WLAN anyway to share my broadband internet
    connection, know I can control lights, shades and heating from my PC
    and from remote sites as well.

    have fun,
    Joe
     
  15. Usually below 10khz is ok. Anything with a clock in it, above that
    according to FCC needs certification, or it did the last time I
    looked.....
    Indeed it is. You simply can't get any transmit power into the aether at
    low frequencies. There is no magic to radio. *Every* ac signal radiates.
    Its automatic. The issue is getting a big enough signal with a bit of
    wire. Of course there are other reasons like BW etc, but moist
    communications don't need much BW.
    Well, I would have to check up on what the the authorities allow. RF is
    not about what is technially feasable or usfull, its about what
    goverments will allow you to use.
    And happens to be the best one for adults.

    Kevin Aylward

    http://www.anasoft.co.uk
    SuperSpice, a very affordable Mixed-Mode
    Windows Simulator with Schematic Capture,
    Waveform Display, FFT's and Filter Design.
     
  16. Boki

    Boki Guest

    Dear Kevin,
    Be good.

    Best wish.

    Boki. :D
     
  17. ROFL! I'll remember that one!

    Jeroen
     
  18. Please Kevin! Stop!

    :)

    Jeroen
     
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