KP4MD's blog

KD2OM, KP4MD and N6GN are now transmitting FST4W-300 on 14 MHz, GPS frequency locked to observe ionospheric spectral spreading.
Read FST4W on the HF Bands: Why - What to expect:
A greater use of FST4W on the HF bands could bring several benefits, the marginal sensitivity increase of 1.4 dB over WSPR for the 120-second variant probably being the least valuable. Other potential benefits are greater tolerance to Doppler spread and the significant increases in sensitivity from the longer sequences. While ionospheric Doppler spread will limit the use of the longer sequences, maximum utility of FST4W can come from careful attention to minimising spectral spread within transmitters and receivers. These are areas where the amateur can make improvements. As the protocol measures spectral width it provides the essential tool to both gauge equipment performance and also bring insights into propagation that SNR alone does not provide.

HAARP (WI2XFX) WSPR plan for 02 August 2018 UTC
0010: NVIS O/X mode, 40m 7.0386 MHz
0014: NVIS O/X mode, 40m 7.0386 MHz
0018: NVIS O/X mode, 40m 7.0386 MHz
0022: NVIS O/X mode, 40m 7.0386 MHz
0026: Mag N/E, 80m 3.5926 MHz
0030: Mag N/E, 80m 3.5926
0034: Mag N/E, 40m 7.0386
0038: Mag N/E, 40m 7.0386
0042: Mag S/W, 40m 7.0386
0046: Mag S/W, 40m 7.0386
*At 30 elevation, 40m grating lobes are significant so e.g. N is ~N+S

Alaska’s super-power High-Frequency Active Auroral Research Program (HAARP) transmitters in Gakona, Alaska, will take advantage of the WSPR digital protocol and the Weak Signal Propagation Reporter Network (WSPRnet) during a short experimental campaign, July 30 through August 1. University of Alaska Fairbanks (UAF) Space Physics Group researcher and HAARP Chief Scientist Chris Fallen, KL3WX, told ARRL that he’ll be conducting research into ionospheric irregularities, but hardly with a weak signal.

Since adding this homebrew elliptical MW bandstop filter to eliminate nearby AM Broadcast overload, I am now able to upload 630m WSPR spots received on my Flex-1500. The filter does not affect its regular HF operation on 80m and above. The antenna is a 40m Loop SkyWire fed with 300 ohm Ladder Line.

The five frequency channels that US amateur radio operators share on a secondary basis with US federal government users on 60 meters (5 MHz) pose unique requirements for CW and digital operators. As explained on, US radio amateur emissions on our 60m channels must be precisely centered in the center frequency of each assigned channel, that is, 5332.0, 5348.0, 5358.5, 5373.0 or 5405.0 kHz.

As evidenced in the WSPR database, some US hams are transmitting on the default WSPR 60m dial frequency 5.2872 MHz which is outside FCC authorized 60m channels.

Some of the questionable 60m reports in the WSPR database appear to be uploads from stations with HF receivers that are not synchronized with the WSPR program frequency, such as in this listing

This Microsoft Excel (2000 or later) spreadsheet has added new enhancements to Mark Hughes GM4ISM's WSPR data download spreadsheet.
To use the spreadsheet, Instructions :- Fill in blue cells and click the cogs (click away from the blue cells first). The macro will retrieve and chart up to 2500 of the most recent spots that match your criteria directly from the online database.

2 meter WSPR spots span the 4061 km between N3IZN in California and KH6IMB in Hawaii today
Read the discussion on!topic/2-meter-wspr/4WaqFZTfYoQ

Charts of 80 meter and 40 meter WSPR Near Vertical Incidence Skywave (NVIS) spots SNR vs. distance
Clusters of spots in red were received during daylight hours. Those in blue during hours of darkness.
The antenna used was a thin wire 40 meter full wave horizontal loop at 6 meters above ground.

An RF-powered quadcopter supported antenna and findings of the VHF/UHF WSPR group will also be presented at the "Introduction to WSPR" session at 10:45 am on 11 October at the ARRL Pacificon Convention at the Marriott Santa Clara in Santa Clara, California.

I checked into the Northern California 432 SSB Net on 432.100 MHz at 1900 PST on Sunday night and also listened carefully as 1 kW net control station KG6HXI in Wilton CA swung her large Yagi antenna calling for check ins around the compass points. I heard some weak SSB signals at or below the noise level from the north and south SF bay area. This suggests that 432 MHz WSPR contacts are possible from Sacramento to those areas.

Here is an updated map of 144 MHz WSPR Study Stations and propagation paths.

Download the KML file from the page and open it in Google Earth
To view an elevation profile, right click on the propagation path and select "Show Elevation Profile"

Carol, KP4MD

Here is the current list for GPS reference locked 144 MHz WSPR stations on the Pacific coast of North America
144.490460 KC6KGE DM05gd - Taft, CA
144.490470 KI6STW CM97bk - Milpitas, CA
144.490480 WA6M CM88in - Timber Cove, CA
144.490490 K6PZB CM88nk - Graton, CA
144.490500 N6GN CM88ok - Santa Rosa, CA
144.490510 KP4MD CM98iq - Citrus Heights, CA
144.490520 WW6D CM88pl - Santa Rosa, CA

Detailed listing at

This modification to GM4ISM's Excel Spreadsheet polls real time WSPRnet data and estimates the signal path quality for various communication modes: WSPR, JT65, Olivia, PSK31, CW, RTTY and SSB. These charts show expected signal dB over threshold on these modes with user-defined transmitter powers and relative antenna gains. The values below threshold are in red, above 6 dB in green and intermediate in yellow.

Here are a few points to consider in resolving the issue of ARISS voice operations in the 2 meter WSPR frequency segment outside of IARU Region 1:

  1. WSPR activity has occurred on 2 meters since the inception of WSPR and will continue into the future. Joe Taylor K1JT mentions 2 meter WSPR activity in the Pacific Northwest as early as April 2008 when the WSPR program was first released.
  2. The G4ILO WSPR page documents 144.490 MHz as the preferred 2 meter WSPR frequency in 2008.
  3. In the IARU Region 1 band plan, 94 nations (a majority of IARU member societies) have concurred on 144.4905 MHz (144.489 MHz dial) as the designated world-wide WSPR frequency on 2 meters. 2 meter frequency allocations in Region 1 are much more constrained than elsewhere as their band encompasses only 144-146 MHz. Therefore Regions 2 and 3 should follow the lead of Region 1 rather than expect Region 1 to change its established band plan.
  4. Although IARU Region 2 (the Americas) currently lacks a VHF band plan, this is an agenda item for the IARU Region 2 General Assembly scheduled for September 2013. A good case may be made for 2 meter WSPR activity in Region 2 to continue in the current WSPR frequency segment of 144.4905 MHz.
  5. Since June of this year, WSPRnet statistics would indicate that 2 meter WSPR network activity has grown to account for probably over 99% of the current regular worldwide activity on 144.4905 MHz.