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9359RE: [wsjtgroup] Re: 1500Hz and the JT9-10 mode

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  • rein0zn@ix.netcom.com
    Dec 14, 2012
    • 0 Attachment
      Hi All,

      JT9 is as WSJT and as WSPR.

      A dial frequency is used ( this is the suppressed carrier frequency of a SSB signal, the WSJTxxx signal
      Then there is a range of audio frequencies to be used the modulate the SSB suppressed carrier.

      In WSJT, a "DF" frequency is used : DF = ( sync. freq - 1278 Hz. ) DF can be pos. and negative.

      In WSPR the "DF" frequency can be selected between 1400 and 1600 Hz

      In JT9-zz there is not really a "DF" defined but the principle is the same.

      Dial frequency and a minimal mod frequency for a transmission are used. ( 1000 - 1600 Hz )

      7039 Dial frequency, frequency selected = 1350 Hz ( for example )

      Signal spectrum 7040.35 to 7040.35 + xx Hz, xx depends on the JT9 selected mode. ( max some 14 Hz I believe , for JT9-1 )

      See JT9 instruction manual for the exact values for XX for the different JT9 modes.

      73 Rein,W6SZ


      -----Original Message-----
      >From: "K. D. Sarchet" <wy5r@...>
      >Sent: Dec 14, 2012 9:53 PM
      >To: wsjtgroup@yahoogroups.com
      >Subject: RE: [wsjtgroup] Re: 1500Hz and the JT9-10 mode
      >
      >This leads to a question of what DF=0 actually is for the JT9-xx modes. My
      >understanding may be incorrect, which is that DF=0 is a tone frequency of
      >1270.5 Hz. So if Hisami is using 1300 Hz as his DF, that would put him at
      >1.910MHz + 1270.5Hz + 1300 Hz, or 1.912571 MHz, which puts him outside where
      >he can legally operate. Can anyone confirm this?
      >
      >73 de WY5R - KD
      >
      >dbcalc - http://dwestbrook.net/projects/ham/dBCalc/
      >===================================================
      >From: wsjtgroup@yahoogroups.com [mailto:wsjtgroup@yahoogroups.com] On Behalf
      >Of cqdx@...
      >Sent: Friday, December 14, 2012 3:31 PM
      >To: wsjtgroup@yahoogroups.com
      >Subject: [wsjtgroup] Re: 1500Hz and the JT9-10 mode
      >

      >Hello Eric and All,
      >
      >I can QRV 160M JT9-xx at 1.910MHz
      >
      >We have Two limitations.
      >narow band width : 1,907,500 to 1,912,500Hz
      >narow occupide band width : less than 100Hz
      >
      >http://www.jarl.or.jp/English/6_Band_Plan/JapaneseAmateurBandplans20090330.p
      >df
      >
      >in this weekend,
      >I will calling CQ at 1.910MHz Dial + 1300Hz AF Tx-first
      >
      >73, Hisami 7L4IOU
      >
      >>Dear Gang:
      >>I would like to try a sked with someone on 160m using JT9-1. I have a
      >rather
      >>poor antenna on 160m (HF-2V 31-ft vertical, 66 radials), so someone in
      >>Washington, Arizona, Nevada, etc, would be great for a first attempt. I am
      >>in the SF Bay area. My antenna is tuned at 1.830 MHz
      >>73,
      >>Eric WD6DBM
      >>
      >
      >
      >
      >
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