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9362RE: [wsjtgroup] Re: 1500Hz and the JT9-10 mode

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  • rein0zn@ix.netcom.com
    Dec 14, 2012
      Hello KD,

      You got it, It's all the same idea, the difference in the carrier frequency ( dial setting ) and the frequencies carrying the sync signals.

      73 Rein W6SZ


      -----Original Message-----
      >From: "K. D. Sarchet" <wy5r@...>
      >Sent: Dec 14, 2012 11:34 PM
      >To: wsjtgroup@yahoogroups.com
      >Subject: RE: [wsjtgroup] Re: 1500Hz and the JT9-10 mode
      >
      >Thanks Rein,
      >
      >I was looking at the DF from the JT65 standpoint. If the DF is set to 0 (zero), the sync tone is 1270.5 Hz (DF = sync freq - 1270.5), similar to your WSJT example of DF = sync freq - 1278. Also, since the visual interface of WSJTX is borrowed from WSJT I assumed too much about the horizontal scale on the graph window. DF in WSJT vs actual sync tone frequency in WSJTX.
      >
      >73 de WY5R - KD
      >
      >dbcalc - http://dwestbrook.net/projects/ham/dBCalc/
      >===================================================
      >From: wsjtgroup@yahoogroups.com [mailto:wsjtgroup@yahoogroups.com] On Behalf Of rein0zn@...
      >Sent: Friday, December 14, 2012 5:12 PM
      >To: wsjtgroup@yahoogroups.com
      >Subject: RE: [wsjtgroup] Re: 1500Hz and the JT9-10 mode
      >
      >
      >
      >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
      >
      >
      >
      >
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