G8JNJ

About

Username
G8JNJ
Joined
Visits
2,504
Last Active
Roles
Member
Points
400

Reactions

150Helpful50Awesome

  • Any Ideas [AM BCB overload]

    G8JNJG8JNJ
    @Lonecrow

    Two things make a difference to the Mini-Whip signal level. The height above 'ground' and the length of the actual Whip element.

    PA3FWM has some good notes on the subject.

    http://www.pa3fwm.nl/technotes/tn07.html

    Regards,

    Martin - G8JNJ
    Powernumpty

  • Home Brew Broadband Magnetic Loop

    G8JNJG8JNJ
    Hi Ron,

    The reduction in IP products with improved amplifier balance are likely to be mostly 2nd order products.

    One trick you could try is to place a 1:1 voltage balun (a pair of bilfilar windings with the end of winding one connected to the start of winding two ) across the amplifier input with the center tap to ground. You may need to experiment with the number of turns and type of ferrite but this is likely to be just as effective (and easier to construct) as an isolating input transformer with a grounded center tap on the secondary (amplifier input) side.

    Regards,

    Martin - G8JNJ
    KA7U

  • Participation of Kiwis in the TDoA process

    G8JNJG8JNJ
    This thread covers splitting GPS feeds.

    http://forum.kiwisdr.com/discussion/comment/3949#Comment_3949
    KA7U

  • Participation of Kiwis in the TDoA process

    G8JNJG8JNJ
    Another success today - I emailed Esteban, EA8DGL, and asked if he could enable his GPS as he's in a great location for TDoA in the Canary Islands just of the West coast of Africa.

    He very kindly did this today and he's now appearing on the TDoA map :-)

    The other good news is that he's just got his Amateur licence and permission to put a better antenna up, so hopefully reception will soon be even better.

    My thanks to Esteban for doing this.

    If anyone else feels like emailing other KiWi owners in key locations that would be very helpful too.

    Maybe we should compile a 'hit' list ?

    Regards,

    Martin - G8JNJ
    WA2ZKD

  • Participation of Kiwis in the TDoA process

    G8JNJG8JNJ
    "How does anyone feel about the possible addition of a limit to how many receivers may run TDoA"

    Seems like a sensible idea to me.

    There may also be potential political problems in some countries e.g. if a KiWi on 'their' territory is used to TDoA military facilities.

    On a similar subject - I notice that users IP addresses are now no longer shown on the KiWi GUI (they may still be logged) but just the approximate location instead. I think this is sensible too.

    Regards,

    Martin - G8JNJ
    WA2ZKD