// Status=review .Wide Graph Settings: - Bins/Pixel = 7 - Zero = -3 - If necessary, adjust the width of the Wide Graph Window so that its upper frequency limit is 4000 Hz. .Main Window: - Select JT9+JT65 on the Mode menu - Toggle the Tx mode button to read Tx JT65, and set the Tx and Rx frequencies to 1718 Hz. - Double-click on Erase to clear both text windows .Open a Wave File: - Select File | Open and navigate to ...\save\samples\130610_2343.wav. The waterfall should look like the figure below. //.130610_2343.wav Decode [[X14]] image::images/130610_2343-wav-80.png[align="left",alt="Wide Graph Decode 130610_2343"] This sample file contains 17 decodable signals — nine in JT65 mode (flagged with the character # in the decoded text windows), and eight in JT9 mode (flagged with @). Since the Tx mode was set to Tx JT65, signals in that mode were decoded first. If you had selected Tx JT9, JT9 signals would have been decoded first. TIP: Notice the [blue]*BLUE* marker on the waterfall scale, by default set at 2500 Hz. Its position is set by the spinner control JT65 nnnn JT9, where nnnn is a frequency in Hz. In JT9+JT65 mode the program will decode JT65 signals below this frequency and JT9 signals above it. - Confirm that mouse-click behavior is similar to that described <>. The program automatically determines the mode of each JT9 or JT65 signal. - Double-click on the waterfall near 815 Hz: a JT65 message originating from W7VP will be decoded and appear in the Rx Frequency Box: [width="70%",cols="3,^3,^3,^4,^4,30",options="header"] |================================= |UTC|db|dt|Freq|Mode|Message |2343|-7|0.3|815|#|KK4DSD W7VP -16 |================================= - Double-click on the waterfall at 3196 Hz and the program will decode a JT9 message from IZ0MIT: [width="70%",cols="3,^3,^3,^4,^4,30",options="header"] |===================================== |UTC|db|dt|Freq|Mode|Message |2343|-7|0.3|3196|@|WB8QPG IZ0MIT -11 |===================================== TIP: Notice that when a signal is decoded in this way, the Tx mode automatically switches to that of the decoded signal and the Rx and Tx frequency markers on the waterfall scale resize themselves accordingly. - Scroll back in the Band Activity window and double-click on the message CQ DL7ACA JO40. The program will set Tx mode to JT65 and Tx and Rx frequencies to that of DL7ACA, 975 Hz. If you had checked *Double-click on call sets Tx Enable* on the Setup menu, the program would configure itself to start a QSO with DL7ACA. - Double-click on the decoded JT65 message CQ TA4A KM37. The program will set Tx mode to JT9 and the Rx and Tx frequencies to 3567 Hz. The program is now configured properly for a JT9 QSO with TA4A. IMPORTANT: Don’t forget to re-enter your own call-sign as “My Call”. .Reopen the First Sample File: - Select File | Open and navigate to ...\save\samples\130418_1742.wav. These data were recorded with a much narrower Rx bandwidth, roughly 200 to 2600 Hz. If you have no Rx filter wider than about 2.7 kHz, you will be using data like this. For best viewing of such data adjust Bins/Pixel and the width of the Wide Graph so that only the active part of the spectrum shows, say 0 to 2600 Hz. Re-open the example file after any change of Bins/Pixel or Wide Graph width, to refresh the waterfall. The signals in this file are all JT9 signals. To decode them in JT9+JT65 mode you’ll need to move the JT65 nnnn JT9 delimiter down to 1000 Hz or less. .Start, Zero, and Gain Now is a good time to experiment with the *Start*, *Zero*, and *Gain* parameters. *Start* sets the starting frequency at the left side of the waterfall scale. *Zero* sets the baseline level for colors, and *Gain* sets the sensitivity for color changes. For the receiver setup of this file good values are *Zero*=0, *Gain*=0. Re-open the wave file after each change, to see the new results.