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Updates to the User Guide for Echo mode. This is still work in progress!
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@ -72,7 +72,7 @@ set (UG_IMGS
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images/config-menu.png
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images/decode-menu.png
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images/download_samples.png
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images/echo_144.png
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images/Echo_1296.png
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images/EME_Deep_0.png
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images/EME_Deep_1.png
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images/EME_Deep_2.png
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@ -280,37 +280,29 @@ being readable by anyone listening in.
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=== Echo Mode
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*Echo* mode allows you to make sensitive measurements of your own
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lunar echoes even when they are too weak to be heard. Select *Echo*
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from the *Mode* menu, aim your antenna at the moon, pick a clear
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frequency, and toggle click *Tx Enable*. _WSJT-X_ will then cycle
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through the following loop every 6 seconds:
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*Echo* mode provides tools for two types of measurements: echoes of
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your transmitted signal from the Moon, and broadband noise power
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received from the Sun, Moon, and possibly other sources including
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nearby ground. In each case the system noise temperature (noise power
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referred to the antenna terminals, expressed in Kelvin degrees) serves
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as the reference noise level. Such measurements are widely used for
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optimizing a station's capabilities for Earth-Moon-Earth (EME)
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communication.
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1. Transmit a 1500 Hz fixed tone for 2.3 s
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2. Wait about 0.2 s for start of the return echo
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3. Record the received signal for 2.3 s
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4. Analyze, average, and display the results
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5. Repeat from step 1
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For lunar echoes, _WSJT_ generates short fixed-frequency transmissions
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that alternate with reception intervals at the appropriate
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Doppler-shifted frequency. With *Split Operation* set to *Rig* or
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*Fake It* on the *Settings | Radio* tab, check *Doppler tracking* and
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*Own Echo* on the Astronomical Data window. Point your antenna at the
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Moon and click *Enable Tx* on the main window to start a sequence of
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echo measurements. Each cycle takes 6 seconds. If strong enough,
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echoes will be visible in the waterfall. Their average spectrum will
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be displayed in the Echo Graph window, and numerical parameters in the
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main window.
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To make a sequence of echo tests:
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image::Echo_1296.png[align="center",alt="Echo 144 MHz"]
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- Select *Echo* from the *Mode* menu.
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- Check *Doppler tracking* and *Constant frequency on the Moon* on the
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Astronomical Data window.
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- Be sure that your rig control has been set up for _Split Operation_,
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using either *Rig* or *Fake It* on the *Settings | Radio* tab.
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- Click *Enable Tx* on the main window to start a sequence of 6-second
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cycles.
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- _WSJT-X_ calculates and compensates for Doppler shift automatically.
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As shown in the screen shot below, when proper Doppler corrections
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have been applied your return echo should always appear at the center
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of the plot area on the Echo Graph window.
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image::echo_144.png[align="center",alt="Echo 144 MHz"]
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... more to come ...
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=== Tips for EME
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