easy and sucsessful op on LF

Discussion in 'The Low Bands - 630/2200 Meters - VLF' started by WA1MTZ, Aug 12, 2019.

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  1. WA1MTZ

    WA1MTZ Ham Member QRZ Page

    no need to reinvent the wheel, I use a arc-5 rx on 630m, a bc779 on 185 kc and an ATR-13 xmtr with a bc-603 ant tuner. use an rf ammeter! ur ant Z will be abt 2 ohms! If you can find a Nautel
    beacon tx you will have something real nice! has built in audio compression too, solid state PDM
  2. K9STH

    K9STH Platinum Subscriber Volunteer Moderator Platinum Subscriber QRZ Page


    I am not familiar with that unit. However, the Collins ART-13 with the LF module will work on the 630-meter band.

    Glen, K9STH
  3. WA1MTZ

    WA1MTZ Ham Member QRZ Page

    wow, it should have been labeled ART-13! sri abt that! also, I hope that any newcomers be advised that you need a VERTICAL ant to tx on LF, horizontal, and beverage types are good for rx only. Some of the best antennas are the cage type vertical s 4 wires spaced 10' apart on a wood mast about 30' high, bottom about 8' off the gnd ,all 4 wires connected together, another good antenna is the 'T' top has 2 wires spaced 8' 80-100' long with 2 wires coming down from the centre to ground level and a loading coil-no capacitors used, just inductance. coil should be litz cable or #8 wire, remember the Z is so low that the loss in the coil can be high. a book written in the 1950's by ITT, is avail free download at https://archive.org 500 page communications manual, look under LF antennas. ps, most air beacon stations ran 25-50w with loaded vert 35'
  4. K9STH

    K9STH Platinum Subscriber Volunteer Moderator Platinum Subscriber QRZ Page


    I figured that it was really an ART-13. I have never owned one but have seen a few of the transmitters.

    For receiving, on the 630-meter band, I can choose from a BC-453, BC-348, TS-440SAT, or a receiving converter into my Heath SB-301. Receiving below 210 kHz I use a Rycom 6010. It is an AM / SSB "selective voltmeter" which is actually a VLF receiver. The Rycom has a digital readout and is very sensitive.

    True ground wave propagation is present on the 2-lowest frequency bands and a vertical is absolutely necessary for true ground wave.

    Glen, K9STH

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