mirror of https://github.com/saitohirga/WSJT-X.git
43 lines
2.0 KiB
Plaintext
43 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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(button should be highlighted in [green]*GREEN*).
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- Set your transceiver to *USB* (or *USB Data*) mode.
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- Use the receiver gain controls and/or Windows mixer controls to set
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the background noise level (scale at lower left of main window) to
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around 30 dB when no signals are present. If necessary you can also use
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the slider next to the scale, but note that the overall dynamic range
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will be best with this slider not too far from its mid-point.
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.Bandwidth and Frequency Setting
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Many SSB transceivers have a fixed-width Tx filter that will not pass
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audio frequencies higher than about 2700 Hz. _WSJT-X_ takes care of
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this by offering a *Split Tx* mode, receiving with *VFO A* and
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transmitting with *VFO B*. Under CAT control _WSJT-X_ offsets the Tx
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dial frequency (*VFO B*) in 500 Hz steps, adjusting the generated
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audio frequency so that it always falls in the range 1500 – 2000
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Hz. With *CAT* and *Split Tx* enabled on the configuration screen and
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your transceiver set to *Split* mode, this frequency control will be
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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 on screen,
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however. On 20m, say, set dial frequency (*VFO A*) to 14.0774 and the
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*JT9 nnnn JT65* dividing line at 1600 Hz. JT9 signals in their
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conventional sub-band will then appear at 1600 – 2600 Hz, while JT65
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signals will be below 1000 Hz. Of course, you might prefer to
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concentrate on one mode at a time, setting your dial frequency to
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(say) 14.076 for JT65 and 14.078 for JT9. Present conventions have
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the nominal JT9 dial frequency 2 kHz higher than the JT65 dial
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frequency, and the checkbox labeled *+2 kHz*, just below the *Band*
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selector, makes the appropriate settings easy.
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IMPORTANT: When you are finished with this Tutorial, don’t forget to
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re-enter your own callsign as *My Call*.
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