OT: Time Signals for clocks - MSF

Comments

• jks

  April 2

  Nice. Well, it's all about the field strength. Very likely you can build something useful that will not be detectable outside of your immediate location.

  And, you can use your Kiwi to test it -- the timecode extension!

  
• n6gn

  April 3

  @smg

  Not to be too picky and it probably doesn't matter since it is all working usefully for you but...

  From your schematic do you believe that an air core coil of 15 turns x 60mm x 10mm is 1700 uH ???

  I doubt that it is even 1700 nH.

  But I can't really tell your model from the picture.
• smg

  April 3

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  OT: Time Signals for clocks - MSF

  https://forum.kiwisdr.com/index.php?p=/discussion/comment/20637#Comment_20637

  Hi All, Sorry - a little OT, however some time ago, when I moved back from the UK to NZ, I brought back a radio clock - one that sets its time off a radio signal transmitted on 60Khz I've found an interesting project - https://github.com/harlock974/time-signal and was keen to hear if anyone had any similar projects they would share or ideas?

  That was the plan!
• smg

  April 3

  This is an embed external element. It can be deleted using the delete key or the backspace key. To view the full element, press the preview button below.

  OT: Time Signals for clocks - MSF

  https://forum.kiwisdr.com/index.php?p=/discussion/comment/20639#Comment_20639

  Hi All, Sorry - a little OT, however some time ago, when I moved back from the UK to NZ, I brought back a radio clock - one that sets its time off a radio signal transmitted on 60Khz I've found an interesting project - https://github.com/harlock974/time-signal and was keen to hear if anyone had any similar projects they would share or ideas?

  Not my project, its one I found.
• jks

  April 3

  That README page is slightly confusing because the picture of the air-core coil and first schematic appear adjacent to each other. The two schematics refer to the second picture which shows an "AM loopstick" style ferrite coil which could easily be 700 uH I would imagine.

  Brings back memories of when I ran a LOWFER beacon on 175 kHz back in the early '80s. 1W input using an IRF510. And an output coil wound on a 200x500 mm coil form using Litz wire. Heard all over the western US. Was it really that long ago? Am I really that old? What happened!

  
• n6gn

  April 3

  jks,

  That would explain it. I really couldn't tell the model from the picture if it wasn't the same thing.

  But it is sure impressive how sub-milliwatts ERP do at LF. I transmitted a bit on 475 kHz with no more than 500 mW ERP, probably somewhat less and was spotted in both Europe and South America from Colorado as well as anywhere in the 50 states that there was a listener..

  When the path length is fewer wavelengths the losses can be very much less. I've never tried 2200m but it sounds interesting.

  PS. I didn't know you ever transmitted , John ! 😀