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[[VHF_SETUP]]
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=== VHF Setup
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_WSJT-X_ v1.7 builds on the features for VHF and higher bands first
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introduced in v1.6. These features now include:
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_WSJT-X_ v1.7 introduces a number of new features designed for use
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on the VHF and higher bands. These features now include:
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- *JT4*, a mode particularly useful for EME on the microwave bands
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- *QRA64*, a mode for EME using a "`Q-ary Repeat Accumulate`" code --
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a low-density partity-check (LDPC) code with a 64-character symbol
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- *JT9* fast modes, useful for scatter propagation on VHF bands
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- *QRA64*, a mode for EME using a "`Q-ary Repeat Accumulate`" code,
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a low-density partity-check (LDPC) code using a 64-character symbol
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alphabet
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- *MSK144*, a mode for meteor scatter using a binary LDPC code and
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Offset Quadrature Phase-Shift Keying (OQPSK), a waveform also
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describable as Minimum Shift Keying (MSK)
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Offset Quadrature Phase-Shift Keying (OQPSK). The resulting waveform
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is sometimes called Minimum Shift Keying (MSK).
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- *ISCAT*, intended for aircraft scatter and other types of scatter
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propagation
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- *Echo* mode, for detecting and measuring your own lunar echoes
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- Automatic *Doppler tracking* for the EME path. This is increasingly
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important on bands above 1.2 GHz.
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- *Doppler tracking*, which becomes increasingly important for EME
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on bands above 1.2 GHz.
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- Optional *Auto-sequencing* of messages for the fast modes.
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- *Auto-sequencing* of transmitted messages for the fast modes with
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forward error control
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[[VHF_SETUP]]
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=== VHF Setup
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To activate the VHF-and-up features:
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- Check the box labeled *Enable VHF/UHF/Microwave features* on the
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- Check *Enable VHF/UHF/Microwave features* and *Single decode* on the
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*Settings | General* tab.
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- In most 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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- For EME, check *Decode at t = 52 s* to allow for the extra path
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delay on received signals.
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- If you will use automatic Doppler tracking and your radio accepts
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frequency-setting commands while transmitting, check the box *Allow Tx
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frequency-setting commands while transmitting, check *Allow Tx
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frequency changes while transmitting*. Transceivers known to permit
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such changes include the IC-735, IC-756 Pro II, IC-910-H, FT-817,
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FT-847, FT-857, FT-897, TS-590S, TS-590SG, TS-2000 (with Rev 9
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firmware upgrade), Flex 1500 and 5000, HPSDR, Anan-10, Anan-100, and
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KX3. On the *Radio* tab select *Split Operation* (use either *Rig* or
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*Fake It*; you may need to experiment with both options to find one
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that works best with your radio).
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FT-847, FT-857, FT-897, TS-590S, TS-590SG, TS-2000 (with Rev 9 or
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later firmware upgrade), Flex 1500 and 5000, HPSDR, Anan-10, Anan-100,
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and KX3.
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- If your radio does not accept commands to change frequency while
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IMPORTANT: If your radio does not accept commands to change frequency while
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transmitting, Doppler tracking will be approximated by making a single
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Tx frequency adjustment before a transmission starts, using a value
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computed for the middle of the Tx period.
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- The main window will reconfigure itself as necessary to display
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controls supporting the features of each mode. For example, in JT4 mode
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the central part of the main window looks something like this:
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- On the *Radio* tab select *Split Operation* (use either *Rig* or
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*Fake It*; you may need to experiment with both options to find one
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that works best with your radio).
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image::VHF_controls.png[align="center",alt="VHF Controls"]
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The main window will reconfigure itself as necessary to display
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controls supporting the features of each mode.
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- If you are using transverters, set appropriate frequency offsets on
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the *Settings | Frequencies* tab. Offset is defined as (transceiver
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@@ -68,8 +68,8 @@ image::Add_station_info.png[align="center",alt="Station information"]
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- On the *View* menu, select *Astronomical data* to display a window
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with important information for tracking the Moon and performing
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automatic Doppler control. Check the box labeled *Doppler tracking*
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to ensure that the right-hand portion of the window is visible.
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automatic Doppler control. The right-hand portion of the window is
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invisible until you check *Doppler tracking*.
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image::Astronomical_data.png[align="center",alt="Astronomical data"]
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@@ -79,35 +79,39 @@ Three different types of Doppler tracking are provided:
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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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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`" would copy all of you on the selected nominal frequency.
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without the need for manual frequency changes.
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=== JT4
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- Select *JT4* from the *Mode* menu.
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JT4 is highly effective for EME on the microwave bands, 2.3 GHz
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and above.
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- Select the desired submode, which determines the tone spacing.
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Higher spacings are used on the higher microwave bands, to allow for
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larger Doppler spreads. For example, submode JT4F is generally used
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for EME on the 10 GHz band.
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- Select *JT4* from the *Mode* menu. The central part of the main
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window will look something like this:
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- The JT4 decoder in _WSJT-X_ includes optional capabilities for
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averaging over successive transmissions, and correlation decoding,
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also known as "`Deep Search`". Either or both of these options may
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be selected from the *Decode* menu.
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image::VHF_controls.png[align="center",alt="VHF Controls"]
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- Select the desired *Submode*, which determines the spacing of
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transmitted tones. Wider spacings are used on the higher microwave
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bands to allow for larger Doppler spreads. For example, submode JT4F
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is generally used for EME on the 5.7 and 10 GHz bands.
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- For EME QSOs some operators use short-form JT4 messages consisting
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of a single tone. To activate automatic generation of these messages,
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check the box labeled *Sh*.
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- Select *Deep* from the *Decode* menu. You may also choose to enable
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averaging over successive transmissions and/or correlation decoding,
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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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- By convention, EME with JT4 can use "`short form`" messages
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consisting of a single tone. To activate automatic generation of
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these messages, check the box labeled *Sh* on the main window.
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IMPORTANT: Additional hints for using JT4 and Echo mode on the
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EME path have been compiled by G3WDG and are available here: {jt4eme}.
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Joe Taylor