☞ In order to toggle USB or LSB mode in SSB mode you have to set the "BW" in channel filter cutoff control (8) to a positive (USB) or negative (LSB) value. The above screenshot shows a USB setup. See the (7) to (9) paragraphs below for details.
☞ The channel marker in the main spectrum display shows the actual band received taking in channel filtering into account.
Use the wheels to adjust the frequency shift in Hz from the center frequency of transmission. Left click on a digit sets the cursor position at this digit. Right click on a digit sets all digits on the right to zero. This effectively floors value at the digit position. Wheels are moved with the mousewheel while pointing at the wheel or by selecting the wheel with the left mouse click and using the keyboard arroews. Pressing shift simultanoeusly moves digit by 5 and pressing control moves it by 2.
Average total power in dB relative to a +/- 1.0 amplitude signal generated in the pass band.
<h3>4: Binaural mode</h3>
Use this button to toggle between monaural and binaural mode. Monaural is classical single sideband or double sidebands modulation. In binaural mode I and Q samples are taken from the left and right stereo channels (or reversed).
When in monaural mode the icon shows a single loudspeaker and when in binaural mode it shows a pair of loudspeakers.
<h3>5: Reverse left and right channels in binaural mode</h3>
Effective only in binaural mode: reverses left and right audio channels so that the left is connected to Q and the right to the I complex signal channel.
Selects between SSB and DSB operation. When in SSB mode the icon shows a single sideband spectrum (USB side). When in DSB mode the icon shows a double sideband spectrum.
The transmitted signal in the sideband (SSB) or sidebands (DSB) sample rate of 48 kHz is further decimated by a power of two before being applied to the channel spectrum display and used to set the in channel filter limits. This effectively sets the total available bandwidth depending on the decimation:
- 1 (no decimation): 24 kHz (SSB) or 48 kHz (DSB)
- 2: 12 kHz (SSB) or 24 kHz (DSB)
- 4: 6 kHz (SSB) or 12 kHz (DSB)
- 8: 3 kHz (SSB) or 6 kHz (DSB)
- 16: 1.5 kHz (SSB) or 3 kHz (DSB)
The span value display is set as follows depending on the SSB or DSB mode:
- In SSB mode: the span goes from zero to the upper (USB: positive frequencies) or lower (LSB: negative frequencies) limit and the absolute value of the limit is displayed.
- In DSB mode: the span goes from the lower to the upper limit of same absolute value and ± the absolute value of the limit is displayed.
This is how the Span (7) and bandpass (8, 9) fitler controls look like in the 3 possible modes:
**DSB**:
- In SSB mode this is the upper (USB: positive frequencies) or lower (LSB: negative frequencies) cutoff of the in channel single side band bandpass filter. The value triggers LSB mode when negative and USB when positive
- In DSB mode this is half the bandwidth of the double side band in channel bandpass filter therefore the value is prefixed with the ± sign.
- In SSB mode this is the lower cutoff (USB: positive frequencies) or higher cutoff (LSB: negative frequencies) of the in channel signe side band bandpass filter.
- In DSB mode it is inactive and set to zero (double side band filter).
This is the volume of the audio signal from 0.0 (mute) to 2.0 (maximum). It can be varied continuously in 0.1 steps using the dial button. The Loudspeaker button is the audio mute toggle.
<h3>11: Level meter in %</h3>
- top bar (beige): average value
- bottom bar (brown): instantaneous peak value
- tip vertical bar (bright red): peak hold value
You should aim at keepimg the peak value below 100% using the volume control
<h3>12: Input source control</h3>
<h4>12.1: Tone input select</h4>
Switches to the tone input. You must switch it off to make other inputs available.
<h4>12.2: Morse keyer input select</h4>
Switches to the Morse keyer input. You must switch it off to make other inputs available.
Switches to the audio input. You must switch it off to make other inputs available.
<h3>13: CW (Morse) text</h3>
Enter the text to be keyed when Morse input is active and in text mode
<h3>14: Clear CW text</h3>
Clears the CW (Morse) text
<h3>15: Morse keyer controls</h3>
<h4>15.1: CW keying speed</h4>
Sets the CW speed in Words Per Minute (WPM). This is based on the word "PARIS" sent 5 times. For 5 WPM the dot length is 240 ms. In other terms the dot length is calculated as 1.2 / WPM seconds. The dot length is used as the base to compute other timings:
- Element (dot or dash) silence separator: 1 dot length
