VLF stations?

Discussion in 'The Low Bands - 630/2200 Meters - VLF' started by N3DT, Dec 25, 2017.

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  1. N3DT

    N3DT Ham Member QRZ Page

    Yes, there's nothing wrong with the way the stations send the code. You just need more practice so you can tell the spaces. Recording and looking at them may be a good idea. You should be able to see the difference in the space between the characters and the letter. Listen to that B, the space from the first dah to the dit is shorter than between the last dit and the next dah (the O). Keep trying.
  2. K8JD

    K8JD Ham Member QRZ Page

    There is more space between the letters than the dits and dahs of each letter, and with a bit of listening, you should be able to pick out the space between the letters.

    This mid day, around 16:00 UT, I took a quick tune across the VLF band I was able to copy :
    245 ZYE (located in ) ON, 254 MB MI, 263 YGK ON, 263 LQL OH, 266 ZHM ON, 269 FN MI, 272 YQA ON. 276 YEL ON, 280 ADG MI, 283, PT ON, 317 ZZR ON, 326 VV ON, 329 THN ON, 332 PH MI, 335 ZKF ON, 338 DE MI, 350 D7 ON, 353, QG ON, 362 AK OH, 363 SB ON, 366 YMW QC, 368 ZYZ ON, 375 7B ON, 382 XU ON, 495 OO ON, 404 ZR ON, 419 RYS MI,
    Good signals from Northern Ontario, across MI and OH and East to to Quebec province of Canada.
    Using my old FT990 radio and a 160M halfwave dipole antenna hanging in trees at 35 Ft..
    Good Listening to all !


    Wow, that's a list.

    Here in Las Vegas, NV, with a FT-950 and an active mini-whip antenna @ 15 feet, I can tune 5 NDBs regularly.
  4. N5MRG

    N5MRG Ham Member QRZ Page

    I've been involved with NDBs for some time.
    Most of the transmitters were 25 watts and consisted of two excitors. One on the carrier and another that was keyed 1khz away. This created the audio tone you hear.
    I chased many beacons down using a loop and a simple wire laying on the ground. Took many pics that have been lost. I had a ton of fun DFing them sometimes hundreds of miles.
    Sadly, most have been decommissioned. Recently I noticed a local one formerly IDing as "EF" in Mckinney Texas has gone SK.
    Many of these were very simple installs using short too loaded towers or basic Tee Marconi antennas with the transmitter located in a dog house.
    Fun memories chasing them down.
  5. ND5Y

    ND5Y Ham Member QRZ Page

    This is something that is actually dying faster than ham radio.
  6. WA4ILH

    WA4ILH Subscriber QRZ Page

    When I was working as an electronics technician for the National Weather Service in Midland Texas back in the late 80s, the FAA next door started getting complains that their NDB had greatly reduced range. They went out to the site and found that a contractor had cut many of the ground counterpoise leads with a ditcher. What was interesting, in the 2 or 3 day time period it took to repair the ground system, they later received a request for a QSL reception report from a SWL living in Nebraska.
    Tom WA4ILH

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