Antenna tuner with swr meter covering at least 135-1000KHz?

Discussion in 'The Low Bands - 630/2200 Meters - VLF' started by AF5IE, Jan 26, 2019.

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  1. AF5IE

    AF5IE Ham Member QRZ Page

    Are there any companies or people making/selling an antenna tuner with SWR and power meters than will cover the range of at least 135KHz to 1MHZ or even just to 500KHz?

    Are there any that don't need their own power supply?

    Are there some good websites for information on making my own?

    Thanks, 73, AF5IE
     
  2. WQ2H

    WQ2H QRZ Lifetime Member #214 Platinum Subscriber Life Member QRZ Page

  3. AA5CT

    AA5CT Ham Member QRZ Page

    5 mH - is that a choke for audio or RF work?
     
  4. WQ2H

    WQ2H QRZ Lifetime Member #214 Platinum Subscriber Life Member QRZ Page

    Typo.

    Must have had inductance on the brain. :rolleyes: The Wavenode WN-2 with a L/M1 sensor will give you 100kHz to 5mHz.

    73
    Jim, WQ2H

    P.S. - My variometer is variable from 3.34 to 3.75 mH (calculated @ 136.5 kHz) - if that counts ! :)
     
  5. K9STH

    K9STH Platinum Subscriber Volunteer Moderator Platinum Subscriber QRZ Page

    2H:

    Methinks you are in need of a few cups of coffee!

    At 5 mHz the sine wave is going to take 33.333-seconds to go through a full cycle! I believe that you really mean 5 MHz! :rolleyes:

    Glen, K9STH
     
    WQ2H and AA5CT like this.
  6. WQ2H

    WQ2H QRZ Lifetime Member #214 Platinum Subscriber Life Member QRZ Page

    I don't know what I'd do without you guys..... :) Hopefully George has got the idea by now !!

    The Wavenode WN-2 with a L/M1 sensor will give you 100kHz to 5MHz.

    73
    Jim, WQ2H
     
  7. AF5IE

    AF5IE Ham Member QRZ Page

    Thanks very much. I'll check it out.

    George, AF5IE
     
  8. SM0AOM

    SM0AOM Ham Member QRZ Page

    What type of antenna do you need to match?

    Most MF antennas are of the monopole type, and usually need only a series inductor and in exceptional cases also a matching autotransformer.

    The power/SWR sensor frequency response is governed by the number of turns and core material in the bridge coupling transformers.

    If the schematics of a 500 kHz marine reserve transmitter or a NDB beacon transmitter are studied, many useful ideas can be gathered.

    73/
    Karl-Arne
    SM0AOM
     
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  9. KH2BR

    KH2BR Ham Member QRZ Page

    KB2FCV likes this.
  10. WQ2H

    WQ2H QRZ Lifetime Member #214 Platinum Subscriber Life Member QRZ Page

    Good show! Somebody's definitely doing the LF thing ! :)

    Well, for $85 you can buy K5DNL's scope match for 630 or 2200m. I use it with a Hantek 6022BE USB oscilloscope. Using this with VK1SV's Marconi calculator makes it fairly easy. Kind of.....


    Good luck !
    73
    Jim, WQ2H / WK2XAH
     

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