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91 lines
4.0 KiB
Plaintext
91 lines
4.0 KiB
Plaintext
=== 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 *JT4*,
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a mode particularly useful for EME on the microwave bands; *Echo* mode,
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for detecting and measuring your own lunar echoes; and automatic
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*Doppler tracking* for the EME path. (Note that sub-modes JT65B and
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JT65C are present in v1.6.0, but are not yet fully implemented for EME
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purposes.)
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- Check the box labeled _Enable VHF/UHF/Microwave features_ on the
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*Settings | General* tab to activate the VHF-and-up features.
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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.
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- If you will use automatic Doppler tracking, check the box
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_Allow Tx frequency changes while transmitting_. Also select
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_Split Operation_ (either _Rig_ or _Fake It_: you might need
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to experiment with both) on the *Radio* tab.
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IMPORTANT: Not all transceivers permit computer adjustments
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of Tx frequency while transmitting. Among those that do are the
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IC735, IC756 Pro II, IC910-H, FT-847, TS-2000 (with Rev 9 firmware
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upgrade), Flex 1500 and 5000, HPSDR, Anan-10, Anan-100, and KX3.
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- When operating in appropriate modes the main window will reconfigure
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itself to include controls supporting the additional features. For
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example, in JT4 mode the central part of the main window will look
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something like this:
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image::images/VHF_controls.png[align="center",alt="VHF Controls"]
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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.
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image::images/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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- Select _Full Doppler to DX Grid_ if you know your QSO partner's locator
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and he/she is not using Doppler control.
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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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Better still, 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 example depicted above, this is 100 kHz above the stated band
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edge, e.g., 10368.100 MHz for the 10 GHz band.
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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 these two controls (kHz + Hz).
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=== EME with JT4
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- Select *JT4* from the *Mode* menu.
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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, JT4F is generally used for EME on
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the 10 GHz band.
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- If using a transverter, set the appropriate offset on the
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*Settings | Frequencies* tab. Offset is defined as (desired
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transceiver dial reading) minus (desired on-the-air frequencty). For
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example, for a 144 MHz radio and 10368 MHz,
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offset = (144 - 10368) = -10224.000. Right-click anywhere inside the
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_Station Information_ box, select the desired band, and enter the
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offset number.
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image::images/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 trandmissions and correlation decoding. Select
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your desired decoding depth from the *Decode* menu.
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image::images/decoding_depth.png[align="center",alt="Decoding Depth"]
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- By convention, EME with JT4 can use ``short form'' messages. To
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activate automatic generation of these messages, check the box labeled
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_Sh_ on the main window.
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IMPORTANT: Many additional details and hints for JT4 EME operation
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are available here:
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http://physics.princeton.edu/pulsar/K1JT/WSJT-X_for_JT4_v6.pdf
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(thanks to G3WDG!).
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