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Domain: nitehawk.com

Stories and comments across the archive that link to nitehawk.com.

Comments · 7

  1. Moonbounce/EME or FTA sattelite by pa3gvr · · Score: 1 · on Fun To Be Had With a 10-Foot Satellite Dish?

    Just get you Amateur Radio license and start bouncing signals off of the moon. http://en.wikipedia.org/wiki/EME_(communications) http://www.nitehawk.com/rasmit/ws1_1.html An other option is watching "free to air" FTA TV channels. If you like to channel surf just Google FTA receiver. A good receiver plus C-Band (or C/Ku) LNB will cost about $200.

  2. Moonbounce by Bananatree3 · · Score: 4, Informative · on Ham Radio Still Growing In the iStuff Age
    For those of you interested in Moonbounce, google "eme moonbounce". EME is Ham Radio slang for bouncing signals of the moon, and it comes from Earth-Moon-Earth. These signals are in the VHF or UHF frequency sections. Most notably, it is in the 144Mhz (2m) or 432Mhz Mhz.

    Sometimes you also get fun stuff like what's coming up in a week. The Arecibo radio astronomy antenna (huge white dish) is bouncing signals off the moon and listening for ham radio operators in a week or two

    Granted, it takes a fairly big antenna and lots of power to bounce signals off the moon. However, there are computer programs that allow for slow text transmission (think really slow modem) via moonbounce, reducing the antenna and power requirements.

  3. No by rcw-home · · Score: 3, Informative · on Twisted Radio Beams Could Untangle the Airwaves

    The article appears to be referring to right or left circular polarization, as opposed to horizontal or vertical polarization. A horizontally-oriented dipole transmitting near a vertically-oriented dipole will be heard much more faintly - 20db+ quieter. Similarly, a left-polarized antenna won't interfere with a right-polarized antenna. But a circularly-polarized antenna will still interfere with a horizontally or vertically polarized antenna - it'll only be 3db weaker.

  4. radio astronomy by 602 · · Score: 1 · on Alternative Uses For an Old Satellite Dish?
    One may do amateur radio astronomy:

    http://radio-astronomy.org/

    http://www.nitehawk.com/rasmit/ras.html

    or even SETI:

    http://www.setileague.org/

  5. Day of the dead. by Crusty+Oldman · · Score: 2, Informative · on Shortwave Radio and The PC

    Two things that are certainly NOT dead: Shortwave and BSD. Visit the page at: DSP radio for LINUX on Intel platforms

    It's a beautifully documented, state of the art, software-defined, digital signal processor. It's downloadable and it's free! (Yeah, I know that Linux is not BSD, and vice versa. But this radio runs under both. Okay?)

  6. signals to the satellite by auroran · · Score: 1 · on Satellite Command Security?

    Sending a signal up to a satellite is fairly easy and somthing that ham radio operators have been doing for years. AMSAT is a good place to check out what has already been done as far as getting a signal up to an orbiting target go. Additionally some ham radio operators have opperated at what's called moonbounce or EME (earth-moon-earth) where they send a signal off the moon and back just for a bit of a challenge and the fun of it. There is also information arround on high power transmitters that are used for that. Hams have been able to do that sort of thing for years. Keep in mind though since that information is public others can do the very same thing. Also somone with a malicious intent won't likely be concerned with government communication regulations.
    73 de VE6OMJ

  7. Ahh, the wonders of physics. by kc0dby · · Score: 4, Informative · on 54 Mbps/100 Mbps Wireless LAN

    In such a short time, we've gone from the days where 80m long radio waves were considered "shortwave" and anything over 100 Mhz was "unusable" to our new modern dreams of Multi Ghz signals and waves getting so short that we are tempted to measure them in millimeters. Lo! What brave new world is this?

    The great thing about really, really tiny waves is the antenna size. While nobody would want to venture the project of making a 24dbi parabolic dish for use with AM radio signals at 500kHz, $80 will get one to your doorstep ready for 2.4Ghz. Now that we are in the upper 5Ghz range, it will finally be feasible to build a mega-super dish where the actual radiated power is in the mega-super-ka-jigga-trilla-watt range. Maybe we could get rid of that whole line of sight problem with Moonbounce communications. Of course the ping time would be seriously worse than the average satellite... The "big sattelite" is just a little outside of geosync orbit..