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Land Ops ARC
 Expedition communications, overland navigation, teamwork challenges

40 meter NVIS

  • 24 Jul 2014 4:41 PM
    Message # 3053746
    Deleted user

    If you don't know what this is, it's a communications method using HF bands to communicate within a 200 to 300 mile distance using non line-of-sight comms. Instead of using 2 meters 146 MHz VHF, we use 40 meter 7.2 MHz HF.  Antenna can be a simple inverted "V" 15 feet at center and two 45 foot long legs at each end.  Power needed between 10 and 100 watts.  Can be setup anywhere out on the trail and is very reliable and low noise. Cannot be Located using direction finding equipment.

    I've set one up using an old ICOM 706 and built the antenna for less than $30.  

    From my location in the Central Valley I have talked (using USB) to stations in Orange County, San Diego, and Oregon State.  Crisp clear low noise daytime use.  For night time 60 meters or 80 meters can also be used.  Right now we are just trying 40 meters.

    We want to run a concurrent landops event between Northern California and Southern California and we want to find someone in SoCal who can run a station down there as a test. Anybody set up yet?

    Last modified: 24 Jul 2014 4:44 PM | Deleted user
  • 25 Jul 2014 10:01 PM
    Reply # 3054989 on 3053746
    Jim Biram (Administrator)

    That sounds like a cool idea.  I don't have any 40m equipment yet, but I bet John Emig W6CYS can do this with his eyes closed.  He built a repeater that we used on the last Big Bear Extreme NightOp.  It would be cool to have the teams have to find antenna parts and then rendezvous to assemble the antenna and make contact.

  • 27 Jul 2014 7:35 PM
    Reply # 3055599 on 3053746

    Very cool E,

    This will get me motivated to upgrade my license, and really open up Land Ops comms training.

    Good article on NVIS and PC-ALE software



    Last modified: 27 Jul 2014 8:50 PM | Anonymous
  • 28 Jul 2014 1:56 PM
    Reply # 3056107 on 3053746
    Deleted user

    Great article Ric.  Jim thats a good idea for assembling the antenna during an op.  It would be cool if we could test this idea during Monache.  Trouble is I might not be able to make it.

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