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d6cf422315
smaller files, by section and sub-section. Also extensive editing up through section 7. Sections 6.2, 8, and beyond definitely need work. Other polishing is also desirable, and maybe also some additions and/or changes. git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@3656 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
37 lines
2.0 KiB
Plaintext
37 lines
2.0 KiB
Plaintext
// Status=review
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.Receiver Noise Level
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- Click the Monitor button to return to normal receive operation.
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- Set your transceiver to USB (or USB Data) mode.
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- Use the receiver gain control(s) and/or the Windows mixer controls
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to set the background noise level to around 30 dB or mid-scale. If
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necessary you can also use the slider next to the scale, but note that
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the overall dynamic range will be best with this slider not too far
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from its mid-point.
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.Bandwidth and Frequency Setting
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Taking full advantage of the wide-band, dual-mode capability of
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{wsjtx} requires a receiver bandwidth of at least 4 kHz. For example,
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on a Kenwood TS-2000 I set *Low Cut* to 200 and *High Cut* to 5000
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Hz. Note that most SSB transceivers have a fixed Tx filter that will
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not pass audio frequencies higher than about 2700 Hz. {wsjtx} takes
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care of this by using Split mode, receiving with *VFO A* and
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transmitting with *VFO B*. The Tx dial frequency (*VFO B*) is offset
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in 500 Hz steps, and the generated audio frequency is adjusted so that
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it always falls in the range 1500 – 2000 Hz. With *CAT* and *Split Tx*
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enabled on the configuration screen and your transceiver set to
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*Tx Split* mode, frequency control will be handled automatically.
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If your transceiver has only a standard SSB filter you won’t be able
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to use more than about 2.7 kHz bandwidth. You can still have all of
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the JT9 sub-band and part of the JT65 sub-band available, however. On
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20m, say, set dial frequency (*VFO A*) to 14.0774 and the *JT9 nnnn JT65*
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dividing line at 1600 Hz. JT9 signals in their conventional sub-band
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will then appear at 1600 – 2600 Hz, while JT65 signals will be below
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1000 Hz. Of course, you might prefer to concentrate on one mode at a
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time, setting your dial frequency to (say) 14.076 for JT65 and 14.078
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for JT9. Present conventions have the nominal JT9 dial frequency 2
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kHz higher than the JT65 dial frequency, and the check-box labeled +2
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kHz, just below the band selector, makes the appropriate settings
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easy.
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