<h3>1: Frequency shift from center frequency of transmission</h3>
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 arrows. Pressing shift simultaneously moves digit by 5 and pressing control moves it by 2.
<h3>2: Channel power</h3>
Average total power in dB relative to a +/- 1.0 amplitude signal generated in the pass band.
<h3>3: Channel mute</h3>
Use this button to toggle mute for this channel.
<h3>4: Mode</h3>
Contains a list of common baud rate and frequency shift settings. To specify your own, set this option to Custom.
45.45/170 is common for amateur RTTY.
<h3>5: Baud</h3>
Specifies the baud rate in symbols (bits) per second.
<h3>6: Frequency Shift</h3>
Adjusts the frequency shift (different between mark and space frequencies) in Hz.
<h3>7: RF Bandwidth</h3>
This specifies the bandwidth of a LPF that is applied to the output signal to limit the RF bandwidth.
<h3>8: Gain</h3>
Adjusts the gain in dB from -60 to 0dB.
<h3>9: Level meter in %</h3>
- top bar (beige): average value
- bottom bar (brown): instantaneous peak value
- tip vertical bar (bright red): peak hold value
<h3>10: UDP</h3>
When checked, a UDP port is opened to receive text from other features or applications that will be transmitted.
<h3>11: UDP address</h3>
IP address of the interface to open the UDP port on, to receive text to be transmitted.
<h3>12: UDP port</h3>
UDP port number to receive text to be transmitted on.
<h3>13: Baudot Character Set</h3>
Specifies the Baudot character set used to encode the text to transmit.
<h3>14: Bit Ordering</h3>
Specifies whether bits are transmitted least-significant-bit first (LSB) or most-significant-bit first (MSB).
<h3>15: Mark/Space Frequency</h3>
When unchecked, the mark frequency is the higher RF frequency, when checked the space frequency is higher.
<h3>16: Unshift on Space</h3>
When checked, the Baudot character set will shift to letters when a space character (' ') is transmitted.
<h3>17: Repeat</h3>
Check this button to repeatedly transmit a packet. Right click to open the dialog to adjust the number of times the packet should be repeated.
<h3>18: Clear Transmitted Text</h3>
Press to clear the transmitted text.
<h3>19: Text to Transmit</h3>
Enter text to transmit. Pressing return will transmit the text and clear this field. Press the arrow to display and select a list of pre-defined text or previously transmitted text to enter in to the field.
<h3>20: TX</h3>
Press to transmits the current text. The text field will not be cleared.
Right click to open a dialog to adjust additional transmitter settings.
<h2>API</h2>
Full details of the API can be found in the Swagger documentation. Below are a few examples.
To transmit the current text simply send a "tx" action:
