User manual

Measure: initiate a series of noise power measurements.

Monitor: start a series of recordings, perhaps to monitor a calling frequency or to copy two

other stations engaged in a QSO.

Play: play most recently decoded file through sound card speaker output. This button

functions much like the “Play” button on a cassette recorder.

QRN: adjust to higher values (default=5) to suppress false decodings caused by

atmospheric noise.

Record: start recording audio noise from radio. The program will record for the time

entered in T/R Period, or until you press Stop. If Auto is ON, recording will stop when the

present T/R interval is finished; the data will then be plotted and decoded. This control

works much like the “Record” button on a cassette recorder.

S: set minimum increase in signal that will be accepted as a ping.

Save Last: save most recently recorded file. (See also Save Decoded and Save all, on the

Save menu).

Sh: set minimum strength in dB of an acceptable FSK441 shorthand message.

Sh Msg: enable transmission of FSK441 shorthand messages R26, R27, RRR, and 73.

Stop: terminate a Record, Monitor, or Play operation. This control functions much like

the “Stop” button on a cassette recorder.

Sync: set synchronizing threshold (default=1) for the JT65 decoder.

Tol: set decoder tolerance (in Hz) to frequency offsets. When DF has been established and

reduced to a small value by retuning the receiver, decrease the value of Tol to reduce the

probability of false decodings.

Tune A, B, C, D: generate steady tones at one of the four standard FSK441 frequencies

882, 1323, 1764, or 2205 Hz.

Tx 1–6: transmit selected message. Transmission will continue until the end of the present

TX sequence or, if Auto is OFF, for the duration listed in the T/R Period box.

TX First: check this box if you want to transmit during the first period of the timed T/R

cycle. Uncheck it if your QSO partner is transmitting in the first period. In this context,

“first” is defined as transmitting during the first T/R interval of an hour.

TX Stop: terminate a transmission in progress.

W: set the minimum width of pings considered for automatic decoding.

Zap: filter out birdies (narrowband signals of approximately constant amplitude) before

attempting to decode.

Main Screen Text Boxes

Average Text: displays average messages in JT65 mode.

Decoded Text: displays decoded messages and other signal information.

Dither (Hz): sets maximum random offset applied to transmitted tones in Echo mode.