55 lines
2.3 KiB
Plaintext
55 lines
2.3 KiB
Plaintext
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// Status=review
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.Receiver Noise Level
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- If it is not already highlighted in green, click the *Monitor*
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button to start normal receive operation.
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- Be sure your transceiver is set to *USB* (or *USB Data*) mode.
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- Use the receiver gain controls and/or the computer's audio mixer
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controls to set the background noise level (scale at lower left of
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main window) to around 30 dB when no signals are present. It is
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usually best to turn AGC off or reduce the RF gain control to minimize
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AGC action.
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.Bandwidth and Frequency Setting
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- If your transceiver offers more than one bandwidth setting in USB
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mode, it may be advantageous to choose the widest one possible, up to
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about 5 kHz. This choice has the desirable effect of allowing the
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*Wide Graph* (waterfall and 2D spectrum) to display the conventional
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JT65 and JT9 sub-bands simultaneously on most HF bands. Further
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details are provided in the <<TUTORIAL,Basic Operating Tutorial>>. A
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wider displayed bandwidth may also be helpful at VHF and above, where
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FT8, JT4, JT65, and QRA64 signals may be found over much wider ranges
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of frequencies.
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- If you have only a standard SSB filter you won’t be able to display
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more than about 2.7 kHz bandwidth. Depending on the exact dial
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frequency setting, on HF bands you can display the full sub-band
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generally used for one mode.
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- Of course, you might prefer to concentrate on one mode at a time,
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setting your dial frequency to (say) 14.074 for FT8, 14.076 for JT65,
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or 14.078 for JT9. Present conventions have the nominal JT9 dial
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frequency 2 kHz higher than the JT65 dial frequency on most bands, and
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the FT8 frequency 2 kHz lower.
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.Transmitter Audio Level
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* Click the *Tune* button on the main screen to switch the
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radio into transmit mode and generate a steady audio tone.
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* Listen to the generated audio tone using your radio’s *Monitor*
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facility. The transmitted tone should be perfectly smooth, with no
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clicks or glitches. Make sure that this is true even when you
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simultaneously use the computer to do other tasks such as email, web
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browsing, etc.
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* Adjust the *Pwr* slider (at right edge of main window) downward from
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its maximum until the RF output from your transmitter falls slightly.
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This is generally a good level for audio drive.
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* Toggle the *Tune* button once more or click *Halt Tx* to stop your
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test transmission.
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