Getting Started with Spot Collection, Active DX Identification, and Analytics

During the late 1980s and early 1990s, VHF and UHF spotting networks began moving from voice repeaters to VHF and UHF PacketClusters that exploited personal computers. In the mid 1990s, the Internet's Telnet protocol was used to construct a network of DXClusters, making it easy for any DXer to monitor spots -- reports of active DX stations -- on his or her Internet-connected computer.

Being aware of DX stations that are currently active or have recently been active, on what bands, and in what modes provides valuable insight to the modern DXer, particularly if the locations from which a DX station was heard are known:

Identifying a currently active DX station as being needed for one or more awards the DXer is pursuing provides the opportunity to make a QSO that will advance award progress.

Viewing raw spots in a scrolling window as they arrive from a PacketCluster or DXCluster or WSJT-X requires the DXer to perform the above analyses - a challenging task even with a single source of spots and one or two award objectives. SpotCollector ingests those raw spots and processes them in real time to provide continuous answers to these questions:

To accomplish this, SpotCollector captures DX spots from multiple spot sources:

Collecting spots from multiple DX cluster nodes is useful because some spot sources report DX from some geographic areas faster than from other areas, and because individual sources can occasionally become unavailable or inaccessible. A local instance of WSJT-X is an excellent source of spots. Some DX Cluster nodes can be configured to convey spots from the Remote Beacon Network (RBN), which provides a high volume of spots - several per second - from a network of automated Skimmers. SpotCollector combines DX Spots for the same station/frequency/mode and stores them in a Database of Active DX Stations on your PC that can be simultaneously displayed in a table, on a world map, on a bandspread display, on a Spectrum-Waterfall display, and to reveal actual propagation:

By using spots to track active DX stations, the DXer can see current band openings from his or her QTH, observe propagation patterns over time, and discover the operating habits of needed DX stations. If you are using DXKeeper to log QSOs and track progress against DXing awards, SpotCollector will use font color to identify active DX stations that are needed for one or more of the DXCC, IOTA, Leaderboard, Marathon, VUCC, WAS, WAZ, or WPX awards you're pursuing, as specified in your DXing objectives; when you work or confirm a needed DX station, SpotCollector automatically updates the information it displays to reflect the new status.

Managing Spot Sources

On installation, SpotCollector comes preconfigured with connection information for several spot sources, but you must specify a username and password before a spot source can be enabled to supply spots. You can also select a different set of spot sources more appropriate to you needs. While all spot sources eventually receive all spots, spots sources closer to a DX station can notify you of that DX station's presence as much as 60 seconds earlier than spot sources located further away. DXers should consider selecting spot sources in Asia, Europe, North America, and South America.

Filering and Prfe-Filtering

By default, SpotCollector inspects each incoming spot of a station operating in a particular mode near a particular frequency, discards it if is too old, and otherwise uses the information from the spot to either update an existing Spot Database Entry for that station in that mode near that frequency, or to create a new Spot Database Entry. SpotCollector's Filtering mechanism lets you focus on a specified subset of the information contained in the Spot Database, like "all active CW stations on the transceiver's current band with whom a confirmed QSO would advance award progress". Filtering does not modify the content of the Spot Database; it modifies only your view of that data - a view you can quickly change to meet your need for information.

In contrast, SpotCollector's Pre-filtering mechanism discards incoming spots that meet criteria you specify without extracting any information from them. When using this mechanism, take care to not discard spots that could identify useful propagation openings or reveal the operating patterns of needed DX stations.

Determining the Mode Being Used by a Spotted Station

DX spots specify a callsign, frequency, date, time, and (optionally) up to 29 characters of "notes". Given the absence of an explicit mode designator, SpotCollector first checks an incoming spot's notes for the presence of a mode designator; if one is present, the Spot Database Entry created will specify the mode designated in the spot notes. If no mode designator is specified in the spot's notes, then SpotCollector queries the specified Sub-band Definition file for an entry whose frequency range encompasses the incoming spot's frequency; if an entry is found, the mode specified in that entry is used in Spot Database Entry created from the spot.

After initial installation, SpotCollector references a Sub-band Definition file named BandModes.txt that defines sub-bands from 160m to 12cm for CW, LSB, USB, FM, and RTTY. You can modify or extend the entries in this file to reflect local usage and to include sub-bands for additional digital modes.

A Sub-band Definition file named BandModes 2022-12-06.txt is also provided in SpotCollector's folder; it defines sub-bands from 2190m to 12cm for CW, LSB, USB, FM, RTTY, PSK31, JT65, JT9, FT8, and FT4. To utilize this Sub-band Definition file, in the Sub-band Definition panel at the bottom of the Configuration window's General tab,

  1. click the Select button

  2. use the Open window that appears to navigate to your SpotCollector folder and select the BandModes 2022-12-06.txt file

  3. terminate and restart SpotCollector

After performing the above steps, the modes of newly-received spots will be determined using the sub-band definitions in BandModes 2022-12-06.txt

Determining the Location of each Active DX Station

To enable SpotCollector to obtain accurate location information for each active DX station (grid square, IOTA tag, CQ zone, ITU zone, continent, primary administrative subdivision, region),

  1. if DXView has not been installed, direct the DXLab Launcher to install it

  2. direct DXView to download the current versions of the DXCC database and USAP database

  3. check the Lookup missing location info box on SpotCollector's Configuration window's General tab so that SpotCollector will perform a lookup on active callsigns in the DXCC or USAP database

Displaying a Tabular View of Active DX Stations

The Spot Database Display in SpotCollector's main window is a scrollable grid with entries for each DX station operating near a particular frequency in a particular mode. Each Spot Database Entry includes

Spot Database Entries are automatically constructed and updated as incoming DX spots arrive at from spot sources like DX Central. Unless the bands are dead, you should already see a few entries.

You can format the Spot Database Display to present information that helps you understand the behavior of needed DX stations and identify band openings from your QTH:

Armed with this knowledge, you can focus your listening on times and frequencies more likely to be productive.

You can sort Spot Database Entries, and you can filter the Spot Database Display to show only entries matching a particular callsign, DXCC entity, band, mode, continent, origin (location of the stations that spotted the DX) or combinations thereof.

There are several ways to determine from where an Active DX station is being spotted.

Identifying Active Stations With Whom a Confirmed QSO Would Advance Your Progress Towards the Awards You Are Pursuing

If you are using DXKeeper to log your QSOs, then the font used to render Spot Database entries will be colored to indicate the impact of a QSO with the spotted station with respect to your DXing objectives :

You can change these font colors by using the Font Colors panel on the Configuration window's Spot Database Display tab.

You can direct Commander to display a Bandspread Window showing active DX Stations with this color-coding.

Identifying Active Stations Known to Participate in and/or LoTW

If DXView is installed and has been directed to download current eQSL and LoTW Databases, the background color of each Spot Database Entry will indicate whether the Entry's callsign is known to participate in and/or ARRL's Logbook of the World (LoTW):

You can change these background colors by using the Background Colors panel on the Configuration window's Spot Database Display tab.

Determining Why a Spot Database Entry's Callsign is Considered ''Needed''

There are several ways to determine why a Spot Database Entry's active Station is needed, meaning that a QSO with that station would advance your progress towards the DXCC, IOTA, Marathon, WAS, WAZ, and WPX awards

Selecting a Spot Database Entry

Clicking a Spot Database Entry will convey the Entry's callsign to DXView, which will display information about the DX station's location -- latitude and longitude, beam heading, distance, local time, CQ zone, and ITU zone -- and highlight that location on a world map with a blue dot connected to your QTH by the signal path; DXView will also convey the location information to PropView.

Double-clicking a Spot Database Entry will convey the entry's callsign, frequency, mode, and grid square to Commander, DXKeeper, DXView, PropView, and/or Pathfinder, enabling them to QSY your transceiver to the appropriate frequency and mode, rotate your antenna, display DX information, prepare to log a QSO, prepare to predict propagation, and/or prepare to seek QSL information. If WinWarbler is running,

Enabling Audio, Email, and Text Announcements

Displaying a World Map View of Active DX Stations

Displaying a Bandspread View of Active DX Stations

You can display active DX stations on

Displaying a Propagation View of Active DX Stations

SpotCollector can use reports of active DX stations by stations near your QTH to display activity on each band by time of day, and to display activity on each band by continent.

Interoperating with WSJT-X

SpotCollector can directly interoperate with WSJT-X

WWV Spots

Many PacketClusters and DXClusters also convey WWV spots -- reports from the United States National Institute of Standard's radio station WWV that include information relevant to HF radio propagation: the Solar Flux Index (SFI), the Boulder A-index, and the Boulder K-index. Information from the most recent WWV spot is displayed in the Main window's WWV panel. SpotCollector records the information from each WWV spot, and presents it in a graphical view illustrating the behavior of these indices over the most recent 31 days. Clicking the History button in the WWV panel in the upper left corner of SpotCollector's Main window displays the Solary & Geogmagnetic Parameters window:

You can examine each of the three indices individually by checking or unchecking the SFI, A, and K boxes in the lower corners of the display. Given the sun's 27-day rotation period, this information can also be helpful in predicting future HF propagation. SpotCollector automatically conveys this information to PropView.

Enabling a DX Cluster's WWV Spot Reporting

To enable WWV spots to DXClusters controlled by DX Spider or CC Cluster applications, issue the command

To enable WWV spots to DXClusters controlled by the AR-Cluster application, issue the command

Determining Whether a DX Cluster Conveys WWV Spots

To determine whether a DX Cluster conveys WWV spots,

  1. connect to the DX Cluster
  2. In the Telnet DXClusters panel on the Spot Sources tab of SpotCollector's Configuration window, uncheck the DX Cluster's Hide and Ann/Talk boxes

  3. A window will appear that enables you to send commands to the DX Cluster and see the responses; issue the SH/WWV command and then strike the Enter key; if the DX Cluster responds by displaying previous WWV spots, you can expect it to report future WWV spots

Automatically Updating the Spot Database and WWV History on Startup

To configure a DX Cluster spot source to update your Spot Database with the most recent 100 DX spots and the most recent 36 WWV spots,

  1. click the Config button to open SpotCollector's Configuration window and select the Spot Sources tab.

  2. in the Initial Cluster commands panel,

    1. paste this command into the spot source's Command box: SH/WWV/36<13><10>SH/DX/100<13><10>set/dxgrid

    2. check the Enable box to the left of the Command box

Now when SpotCollector starts up, it will direct that cluster to report the most recent 100 DX spots and the most recent 36 WWV spots. You can configure S!potCollector to send initial cluster commands to multiple spot sources.

Spot Sources

Using the Spot Database Display

Callsigns Requiring Special Action

Additional Functionality


Improving Performance


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Getting Started with DXLab

CollectingSpots (last edited 2023-11-01 20:04:07 by AA6YQ)