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Starting to update the WSJT-X User Guide for version 1.7. More to come!
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7063 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
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@ -6,25 +6,40 @@ the program name stand for "`Weak Signal communication by K1JT,`" while
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the suffix "`-X`" indicates that _WSJT-X_ started as an extended (and
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experimental) branch of the program _WSJT_.
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_WSJT-X_ Version 1.6 offers five protocols or "`modes`": JT4, JT9, JT65
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WSPR, and Echo. The first three are designed for making reliable
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QSOs under extreme weak-signal conditions. They use nearly identical
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message structure and source encoding. JT65 was designed for EME
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("`moonbounce`") on the VHF/UHF bands and has also proven very effective
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for worldwide QRP communication on the HF bands. JT9 is optimized for
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the LF, MF, and lower HF bands. It is 2 dB more sensitive than
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JT65 while using less than 10% of the bandwidth. JT4 offers a wide
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variety of tone spacings and has proved very effective for EME on
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microwave bands up to 24 GHz. All three of these modes use one-minute
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timed sequences of alternating transmission and reception, so a
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minimal QSO takes four to six minutes — two or three transmissions by
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each station, one sending in odd UTC minutes and the other even. On
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the HF bands, world-wide QSOs are possible using power levels of a few
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watts and compromise antennas. On VHF bands and higher, QSOs are
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possible (by EME and other propagation types) at signal levels 10 to
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15 dB below those required for CW.
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_WSJT-X_ Version 1.7 offers eight protocols or "`modes`": *JT4*,
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*JT9*, *JT65*, *QRA64*, *WSPR*, *Echo*, *ISCAT*, and *MSK144*. The
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first four are designed for making reliable QSOs under extreme
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weak-signal conditions. They use nearly identical message structure
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and source encoding. JT65 and QRA64 were designed for EME
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("`moonbounce`") on the VHF/UHF bands and have also proven very
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effective for worldwide QRP communication on the HF bands. QRA64 has
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a number of advantages over JT65, including better performance on the
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very weakest signals. We imagine that over time it will replace JT65
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for EME use. JT9 is optimized for the LF, MF, and lower HF bands. It
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is 2 dB more sensitive than JT65 while using less than 10% of the
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bandwidth. JT4 offers a wide variety of tone spacings and has proved
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very effective for EME on microwave bands up to 24 GHz. All of these
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"`slow`" modes use one-minute timed sequences of alternating
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transmission and reception, so a minimal QSO takes four to six minutes
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— two or three transmissions by each station, one sending in odd UTC
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minutes and the other even. On the HF bands, world-wide QSOs are
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possible using power levels of a few watts (or even milliwatts) and
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compromise antennas. On VHF bands and higher, QSOs are possible (by
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EME and other propagation types) at signal levels 10 to 15 dB below
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those required for CW.
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WSPR (pronounced "`whisper`") stands for Weak Signal Propagation
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*ISCAT*, *MSK144*, and optionally *JT9E-H* are "`fast`" modes designed
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to take advantage of brief signal enhancements from ionized meteor
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trails and other types of scatter propagation. These modes use timed
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sequences of 5, 10, 15, or 30 s duration. User messages are
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transmitted repeatedly at high rate (up to 250 characters per second,
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for MSK144) to make good use of the shortest meteor "`pings`". ISCAT
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uses free-form messages up to 28 characters long, while MSK144 uses
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the same structured messages as the slow modes together with an
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abbreviated format with hashed callsigns for messages sent after
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initial contact has been established.
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*WSPR* (pronounced "`whisper`") stands for Weak Signal Propagation
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Reporter. The WSPR protocol was designed for probing potential
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propagation paths using low-power transmissions. WSPR messages
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normally carry the transmitting station’s callsign, grid locator, and
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@ -34,7 +49,7 @@ internet access can automatically upload their reception reports to a
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central database called {wsprnet} that provides a mapping facility,
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archival storage, and many other features.
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Echo mode allows you to detect and measure your own lunar echoes,
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*Echo* mode allows you to detect and measure your own lunar echoes,
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even if they are far below the audible threshold.
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_WSJT-X_ provides spectral displays for passbands up to 5 kHz,
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@ -1,36 +1,25 @@
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=== New in Version 1.6
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=== New in Version 1.7
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For quick reference, here's a short list of features and capabilities
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added to _WSJT-X_ since Version 1.5.0:
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added to _WSJT-X_ since Version 1.6.0:
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- *WSPR* mode, including coordinated automatic band-hopping and a
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new two-pass decoder that can decode overlapping signals.
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- New modes: ISCAT, MSK144, QRA64.
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- EME-motivated features including *JT4* (submodes *A-G*), *Echo*
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mode, and automatic *Doppler tracking*. The JT4 decoder is more
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sensitive than that in the latest WSJT, and message averaging is fully
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automated. (Note that submodes *JT65B* and *JT65C* are also present
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in Version 1.6, but the high-sensitivity decoder required for EME with
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JT65 is not yet included.)
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- Newly implemented submodes of existing modes: JT65B-C, JT9B-H (wide
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and fast).
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- Tools for accurate *frequency calibration* of your radio, so you can
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be always on-frequency to within about 1 Hz.
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- New Franke-Taylor decoder replaces the Koetter-Vardy decoder in
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JT65. KVASD is no longer used.
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- Mode-specific standard working frequencies accessible from the
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drop-down band selector.
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- Improvements to the JT4, JT9, and JT65 decoders.
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- Multi-pass decoding for JT65 and WSPR.
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- Improved convenience features for EME Doppler tracking.
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- Multiple program configurations can be saved and restored.
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- A new sample-file download facility.
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- A number of corrections to the Hamlib library, fixing balky
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rig-control features. A few unreliable features peculiar to
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particular radios have been removed.
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=== Future releases
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Much work has already been done on Version 1.7 of _WSJT-X_. (Up to
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now this branch has been called v1.6.1.) More than 100 people have
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been building this version for themselves as development progresses,
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and reporting on their experiences. The next release will offer
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several "`fast modes`" intended for meteor and ionospheric scatter,
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including a new FEC-enhanced mode called *JTMSK*. It will also have a
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significantly improved JT65 decoder, especially advantageous when used
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in crowded HF bands. Starting with Version 1.7, _WSJT-X_ will no
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longer use the patented, closed-source Koetter-Vardy algorithm.
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rig-control features.
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@ -1,16 +1,20 @@
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=== VHF Setup
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V1.6.0 is the first _WSJT-X_ version to include features specifically
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designed for use on VHF and higher bands. These features include
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_WSJT-X_ v1.7.0 builds on the features designed for use on VHF and
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higher bands first introduced in v1.6. These features now include
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*JT4*, a mode particularly useful for EME on the microwave bands;
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*Echo* mode, for detecting and measuring your own lunar echoes; and
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automatic *Doppler tracking* for the EME path. The accuracy of
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Doppler calculations is better than 1 Hz at 10 GHz. (Note that
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sub-modes JT65B and JT65C are present in v1.6.0, but are not yet fully
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implemented for EME purposes.)
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*QRA64*, a mode for EME using a "`Q-ary Repeat Accumulate`" code, a
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low-density partity-check (LDPC) code using a 64-character symbol
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alphabet; *MSK144*, a mode for meteor scatter using a binary LDPC code
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and offset quadrature phase-shift keying (OQPSK), a waveform also
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known as Minimum Shift Keying (MSK); and *ISCAT*, intended for other
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types of scatter propagation. Additional VHF-and-up features include
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*Echo* mode, for detecting and measuring your own lunar echoes, and
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automatic high-accuracy *Doppler tracking* for the EME path.
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- To activate the VHF-and-up features check the box labeled _Enable
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VHF/UHF/Microwave features_ on the *Settings | General* tab.
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VHF/UHF/Microwave features_ on the *Settings | General* tab. In most
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cases you will also want to check _Single decode_.
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- If you will be doing EME, check the box _Decode at t = 52 s_
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to allow for the EME path delay on received signals.
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@ -38,28 +42,28 @@ to ensure that the right-hand portion of the window is visible.
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image::Astronomical_data.png[align="center",alt="Astronomical data"]
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IMPORTANT: Note that two different types of Doppler control are provided.
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IMPORTANT: Note that three different types of Doppler tracking are
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provided.
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- Select _Full Doppler to DX Grid_ if you know your QSO partner's locator
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and he/she will not be using any Doppler control.
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- Select _Receive only_ to enable EME Doppler tracking of your receive
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frequency to a specific locator; your Tx frequency will remain fixed.
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- Select _Constant frequency on Moon_ to correct for your own (one-way)
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Doppler shift to or from the Moon. If your QSO partner does the same
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thing, both stations will have the required Doppler compensation.
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Moreover, anyone else using this option will hear both of you
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without the need for manual frequency changes. The hypothetical "`man
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in the moon`" will copy all of you on the selected nominal frequency.
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in the moon`" would copy all of you on the selected nominal frequency.
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- In the example depicted above, the moon-based nominal frequency is
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100 kHz above the stated band edge, or 10368.100 MHz for the 10 GHz
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band. The home station two-way self Doppler shift is +6193 Hz, so the
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one-way shift is +3096.5 Hz. Therefore, the receive frequency is set
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to 10,360.103097 Hz. When a transmission is started, the frequency
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is reset to 3096.5 Hz below the nominal frequency.
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- Spinner controls at top right of the *Astronomical Data* window let you
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set a working frequency above the nominal band edge. The frequency above
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band edge is the sum of the numbers in these two controls (kHz + Hz).
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band. The home station two-way self Doppler shift is +24366 Hz, so the
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one-way shift is +12183 Hz. Therefore, the receive frequency is set
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to 10,360.112183 Hz. When a transmission is started, the frequency
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will be reset to 12183 Hz _below_ the nominal on-the-moon frequency.
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=== EME with JT4
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@ -82,11 +86,7 @@ image::Add_station_info.png[align="center",alt="Station information"]
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- The JT4 decoder in _WSJT-X_ includes optional facilities for
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averaging over successive transmissions and also correlation decoding,
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sometimes known as "`Deep Search`".
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IMPORTANT: The *Decode* menu appears to provide options to set
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different decoding behavior. However, in JT4 mode _WSJT-X_ Version
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1.6 always behaves as if you have selected _Include correlation_.
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also known as "`Deep Search`".
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image::decoding_depth.png[align="center",alt="Decoding Depth"]
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@ -97,6 +97,22 @@ _Sh_ on the main window.
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IMPORTANT: Thanks to G3WDG, many additional hints for using JT4 and
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Echo mode on the EME path are available in {jt4eme}.
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=== EME with JT65
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TBD ...
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=== EME with QRA64
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TBD ...
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=== Meteor Scatter with MSK144
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TBD ...
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=== Scatter Propagation with ISCAT
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TBD ...
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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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