Results 1 to 2 of 2

Thread: New way of CW exchange

  1. #1

    Join Date
    Apr 2011
    Location
    Dorset UK
    Posts
    79

    Default New way of CW exchange

    Hi,
    I recently learnt a bit about WSPR, and it's very narrow bandwidth. I wondered why, as CW has less information than the short sentence used in WSPR does it need such a wide bandwidth, compared to WSPR. I understand that WSPR is sent at intervals, where CW needs to be live or as near to live as possible.

    When I'm thinking, I prefer to be uninformed, so as not to be too biased. so far I know that WSPR send a short sentence of location, callsign etc and CW has Dots Dashes and spaces.

    I've seen an image of what a WSPR signal looks like and would like to know how the varying wave is produced, in as simple way as possible please.
    C.

  2. #2
    Super Moderator 5B4AJB's Avatar
    Join Date
    Mar 2008
    Location
    Meneou, Cyprus
    Posts
    2,295

    Default

    Here is the wiki explanation, it says the bandwidth necessary is 50Hz, whereas a CW could, theoretically, be narrower at 1Hz.
    I have personally not used WSPR, but it looks like a system like RTTY with the advantage of "in-between" tones, allowing for more throughput.
    Actually producing the tones can be done several ways, all requiring a stable timebase. You could modify the transmitter frequency of a continuous wave to give the FSK, or, more commonly, send different tones to an SSB transmitter.

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •