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Updates to the User Guide for Echo mode. This is still work in progress!

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Joe Taylor 2022-10-06 15:00:29 -04:00
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commit 98a67820c8
4 changed files with 21 additions and 29 deletions
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doc/CMakeLists.txt
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@ -72,7 +72,7 @@ set (UG_IMGS
images/config-menu.png
images/decode-menu.png
images/download_samples.png
images/echo_144.png
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doc/user_guide/en/vhf-features.adoc
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@ -280,37 +280,29 @@ being readable by anyone listening in.
=== Echo Mode
*Echo* mode allows you to make sensitive measurements of your own
lunar echoes even when they are too weak to be heard. Select *Echo*
from the *Mode* menu, aim your antenna at the moon, pick a clear
frequency, and toggle click *Tx Enable*. _WSJT-X_ will then cycle
through the following loop every 6 seconds:
*Echo* mode provides tools for two types of measurements: echoes of
your transmitted signal from the Moon, and broadband noise power
received from the Sun, Moon, and possibly other sources including
nearby ground. In each case the system noise temperature (noise power
referred to the antenna terminals, expressed in Kelvin degrees) serves
as the reference noise level. Such measurements are widely used for
optimizing a station's capabilities for Earth-Moon-Earth (EME)
communication.
1. Transmit a 1500 Hz fixed tone for 2.3 s
2. Wait about 0.2 s for start of the return echo
3. Record the received signal for 2.3 s
4. Analyze, average, and display the results
5. Repeat from step 1
For lunar echoes, _WSJT_ generates short fixed-frequency transmissions
that alternate with reception intervals at the appropriate
Doppler-shifted frequency. With *Split Operation* set to *Rig* or
*Fake It* on the *Settings | Radio* tab, check *Doppler tracking* and
*Own Echo* on the Astronomical Data window. Point your antenna at the
Moon and click *Enable Tx* on the main window to start a sequence of
echo measurements. Each cycle takes 6 seconds. If strong enough,
echoes will be visible in the waterfall. Their average spectrum will
be displayed in the Echo Graph window, and numerical parameters in the
main window.
To make a sequence of echo tests:
image::Echo_1296.png[align="center",alt="Echo 144 MHz"]
- Select *Echo* from the *Mode* menu.
- Check *Doppler tracking* and *Constant frequency on the Moon* on the
Astronomical Data window.
- Be sure that your rig control has been set up for _Split Operation_,
using either *Rig* or *Fake It* on the *Settings | Radio* tab.
- Click *Enable Tx* on the main window to start a sequence of 6-second
cycles.
- _WSJT-X_ calculates and compensates for Doppler shift automatically.
As shown in the screen shot below, when proper Doppler corrections
have been applied your return echo should always appear at the center
of the plot area on the Echo Graph window.
image::echo_144.png[align="center",alt="Echo 144 MHz"]
... more to come ...
=== Tips for EME