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Re: [wsjtgroup] WSJT v1.1: Working dual mode with a 2.8kHz receiver filer.

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  • Joe Subich, W4TV
    This same procedure works a treat with the IC-706mkIIg - I ve been using it for my testing with that rig on the bench - so I suspect it works with any of the
    Message 1 of 2 , Jul 19, 2013
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      This same procedure works a treat with the IC-706mkIIg - I've been
      using it for my testing with that rig on the bench - so I suspect it
      works with any of the Icom rigs that do not make it to 4 KHZ bandwidth.

      73,

      ... Joe, W4TV


      On 7/19/2013 2:22 PM, g4wjs wrote:
      > Hi all,
      >
      > this new JT65 + JT9 version is great, you can stay busy on the crowded JT65A frequencies or jump to more rarefied JT9 section (hopefully that will start to change now).
      >
      > I have an older transceiver, an Icom IC-756, and at the moment my widest SSB rx filter is 2.8kHz so I read with interest Joe's documentation suggesting spanning as much of the two sections as possible with a compromise dial frequency and an offset mode separator to hit the right spot on the band to bisect the different mode usage.
      >
      > The alternative seems to be to stick with one mode at a time and work without the split mode and combined JT65/JT9 mode. This works just fine with the +2kHz checkbox making it a three mouse click operation to switch modes.
      >
      > But I wanted more, don't we all. My radio has twin pass band tuning (AKA IF shift with width integrated) with which I can shift the pass band up and down a couple of kHz. I expect all radios that are stable enough for use with JT9 have an IF shift of some sort. So if you are in a similar situation give the following a try.
      >
      > Turn on the JT65+JT9 mode, set split mode in the config and on the radio (obviously you need to have a working CAT setup), set the waterfall to 4kHz wide and then just twist the IF shift to concentrate on any 2.8kHz section of the 4kHz pass band. It works just like using a whizzy DSP radio with wide receive options, except that you have to follow the activity up and down a bit with the IF shift.
      >
      > It's really easy to see where the filter pass band is, if you use the recommended cumulative mode on the waterfall display, as you see the shape and position of the filter right there on the screen.
      >
      > 73
      > Bill.
      >
      >
      >
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