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git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7228 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
90 lines
3.6 KiB
Plaintext
90 lines
3.6 KiB
Plaintext
- Select *WSPR* from the *Mode* menu. The main window will
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reconfigure itself to the WSPR interface, removing some controls not
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used in WSPR mode.
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- Set the Wide Graph controls as suggested below.
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image::WSPR_WideGraphControls.png[align="center",alt="WSPR_WideGraphControls"]
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- Use the mouse to drag the width and height of the main window to the
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desired size.
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- Select an active WSPR frequency (for example, 10.1387 or 14.0956 MHz).
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- Click *Monitor* to start a WSPR receiving period.
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- If you will be transmitting as well as receiving, select a suitable
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value for *Tx Pct* (average percentage of 2-minute sequences devoted to
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transmitting) and activate the *Enable Tx* button.
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- Select your Tx power (in dBm) from the drop-down list.
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=== Band Hopping
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WSPR mode allows those with CAT-controlled radios to investigate
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propagation on many bands without user intervention. Coordinated
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hopping enables a sizable group of stations around the world to move
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together from band to band, thereby maximizing the chances of
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identifying open propagation paths.
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- To enable automatic band-hopping, check the *Band Hopping* box on
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the main window.
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- Click *Schedule* to open the *WSPR Band Hopping* window, and select
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the bands you wish to use at each time of day.
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image::band_hopping.png[align="center",alt="Band Hopping"]
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- Band-switching occurs after each 2-minute interval. Preferred bands
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are identified with time slots in a repeating 20-minute cycle,
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according to the following table:
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[width="80%",align="center",cols=">20,10*>8",options="header"]
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|===
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|Band: |160|80|60|40|30|20|17|15|12|10
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.3+|*UTC minute:* | 00|02|04|06|08|10|12|14|16|18
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>| 20|22|24|26|28|30|32|34|36|38
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>| 40|42|44|46|48|50|52|54|56|58
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|===
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- If the preferred band is not active according to your band-hopping
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schedule, a band will be selected at random from among the active
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bands.
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- If the box labeled *Tune* is checked for a particular band, _WSJT-X_
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transmits an unmodulated carrier for several seconds just after
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switching to that band and before the normal Rx or Tx period
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starts. This feature can be used to activate an automatic antenna
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tuner (ATU) to tune a multi-band antenna to the newly selected band.
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- Depending on your station and antenna setup, band changes might
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require other switching besides retuning your radio. To make this
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possible in an automated way, whenever _WSJT-X_ executes a successful
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band-change command to a CAT-controlled radio, it looks for a file
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named +user_hardware.bat+, +user_hardware.cmd+, +user_hardware.exe+,
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or +user_hardware+ in the working directory. If one of these is found,
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_WSJT-X_ tries to execute the command
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user_hardware nnn
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- In the above command +nnn+ is the band-designation wavelength in
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meters. You must write your own program, script, or batch file to do
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the necessary switching at your station.
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The following screen shot is an example of WSPR operation with
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band-hopping enabled:
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image::WSPR_2.png[align="center",alt="WSPR_2"]
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A careful look at the screen shot above illustrates some of the
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impressive capabilities of the WSPR decoder. For example, look at the
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decodes at UTC 0152, 0154, and 0156 along with the corresponding
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minutes from the waterfall display below. Yellow ovals have been
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added to highlight two isolated signals decoded at -28 and -29 dB in
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the first and third two-minute interval. At 0154 UTC signals from
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VE3FAL, AB4QS, and K5CZD fall within a 5 Hz interval near audio
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frequency 1492 Hz; similarly, K3FEF, DL2XL/P, and LZ1UBO fall within
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a 6 Hz interval near 1543 Hz. Each of the overlapping signals is
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decoded flawlessly.
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image::WSPR_1a.png[align="center",alt="WSPR_1a"]
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