Jon Harder
@ng0e.bsky.social
Creator and maintainer of
• vhf.dxview.org
• hf.dxview.org
• vhf.dxview.org
• hf.dxview.org
There are now two ways to bookmark the HF+ propagation map:
By band: hf.dxview.org/band/14 — set the band to the given MHz. Valid band numbers are 1, 3, 5, 7, 10, 14, 18, 21, 24, 28, and 50.
By location (grid square):
hf.dxview.org/perspective/...
#hamradio
By band: hf.dxview.org/band/14 — set the band to the given MHz. Valid band numbers are 1, 3, 5, 7, 10, 14, 18, 21, 24, 28, and 50.
By location (grid square):
hf.dxview.org/perspective/...
#hamradio
November 15, 2025 at 12:03 AM
There are now two ways to bookmark the HF+ propagation map:
By band: hf.dxview.org/band/14 — set the band to the given MHz. Valid band numbers are 1, 3, 5, 7, 10, 14, 18, 21, 24, 28, and 50.
By location (grid square):
hf.dxview.org/perspective/...
#hamradio
By band: hf.dxview.org/band/14 — set the band to the given MHz. Valid band numbers are 1, 3, 5, 7, 10, 14, 18, 21, 24, 28, and 50.
By location (grid square):
hf.dxview.org/perspective/...
#hamradio
An update to the VHF propagation map has been uploaded. It has a number of fixes including better representation of activity that is adjacent to the international dateline, particularly for New Zealand.
vhf.dxview.org
#hamradio #newzealand
vhf.dxview.org
#hamradio #newzealand
November 12, 2025 at 12:38 AM
An update to the VHF propagation map has been uploaded. It has a number of fixes including better representation of activity that is adjacent to the international dateline, particularly for New Zealand.
vhf.dxview.org
#hamradio #newzealand
vhf.dxview.org
#hamradio #newzealand
Another followup to this — if you hold down the "r" (for recursive) key and select a footprint, it will expand to all the connected paths. To reduce clutter station callsigns are omitted.
You may need to refresh your browser to pick up the change.
You may need to refresh your browser to pick up the change.
October 18, 2025 at 11:30 AM
Another followup to this — if you hold down the "r" (for recursive) key and select a footprint, it will expand to all the connected paths. To reduce clutter station callsigns are omitted.
You may need to refresh your browser to pick up the change.
You may need to refresh your browser to pick up the change.
Happening now: I think this is legitimate propagation from Wichita to northern Mississippi. Can anyone on the ground confirm?
vhf.dxview.org
#hamradio
vhf.dxview.org
#hamradio
September 25, 2025 at 1:06 PM
Happening now: I think this is legitimate propagation from Wichita to northern Mississippi. Can anyone on the ground confirm?
vhf.dxview.org
#hamradio
vhf.dxview.org
#hamradio
There is a new button on all devices to reveals a propagation prediction between two points on the HF map.
To show the prediction, first select an initial location. Next select a distant point of interest. Finally, at the top of the window, select "show prediction …".
hf.dxview.org
#hamradio
To show the prediction, first select an initial location. Next select a distant point of interest. Finally, at the top of the window, select "show prediction …".
hf.dxview.org
#hamradio
September 25, 2025 at 12:11 AM
There is a new button on all devices to reveals a propagation prediction between two points on the HF map.
To show the prediction, first select an initial location. Next select a distant point of interest. Finally, at the top of the window, select "show prediction …".
hf.dxview.org
#hamradio
To show the prediction, first select an initial location. Next select a distant point of interest. Finally, at the top of the window, select "show prediction …".
hf.dxview.org
#hamradio
Enhancements for mobile devices have been completed for the HF propagation map.
Most visitors to the HF map are using a phone or tablet. The experience on phones and tablets is much improved now.
The changes will be activated the next time you open or refresh the site.
hf.dxview.org
#hamradio
Most visitors to the HF map are using a phone or tablet. The experience on phones and tablets is much improved now.
The changes will be activated the next time you open or refresh the site.
hf.dxview.org
#hamradio
September 25, 2025 at 12:11 AM
Enhancements for mobile devices have been completed for the HF propagation map.
Most visitors to the HF map are using a phone or tablet. The experience on phones and tablets is much improved now.
The changes will be activated the next time you open or refresh the site.
hf.dxview.org
#hamradio
Most visitors to the HF map are using a phone or tablet. The experience on phones and tablets is much improved now.
The changes will be activated the next time you open or refresh the site.
hf.dxview.org
#hamradio
The HF map is most useful when your location is selected because it personalized the map for your QTH.
September 18, 2025 at 1:03 AM
The HF map is most useful when your location is selected because it personalized the map for your QTH.
The draggable target for selecting your station's location has been slimmed down (same on mobile and desktops) and the corresponding text input moved to the top of the screen.
Panning or zooming the map under the selector now correctly updates the targeted location.
Panning or zooming the map under the selector now correctly updates the targeted location.
September 18, 2025 at 1:03 AM
The draggable target for selecting your station's location has been slimmed down (same on mobile and desktops) and the corresponding text input moved to the top of the screen.
Panning or zooming the map under the selector now correctly updates the targeted location.
Panning or zooming the map under the selector now correctly updates the targeted location.
ANNOUNCEMENT: the process of optimizing the HF+ propagation map for mobile devices has started. The app is working much better on small screens now. The band selection bar appears conveniently at the top of the screen.
hf.dxview.org
#hamradio
hf.dxview.org
#hamradio
September 18, 2025 at 1:03 AM
ANNOUNCEMENT: the process of optimizing the HF+ propagation map for mobile devices has started. The app is working much better on small screens now. The band selection bar appears conveniently at the top of the screen.
hf.dxview.org
#hamradio
hf.dxview.org
#hamradio
The VHF propagation map is working much better for mobile devices now. A significant number of visitors use mobile or tablet devices and this will greatly improve their experience.
Let me know if something should be working better!
vhf.dxview.org
#HamRadio
Let me know if something should be working better!
vhf.dxview.org
#HamRadio
September 12, 2025 at 1:27 AM
The VHF propagation map is working much better for mobile devices now. A significant number of visitors use mobile or tablet devices and this will greatly improve their experience.
Let me know if something should be working better!
vhf.dxview.org
#HamRadio
Let me know if something should be working better!
vhf.dxview.org
#HamRadio
ANNOUNCEMENT: the VHF propagation map is being optimized for tablets and mobile devices. It is working much better for the smaller screens.
There are a few differences between mouse- and touch-based interaction:
vhf.dxview.org
#hamradio
There are a few differences between mouse- and touch-based interaction:
vhf.dxview.org
#hamradio
September 4, 2025 at 11:38 PM
ANNOUNCEMENT: the VHF propagation map is being optimized for tablets and mobile devices. It is working much better for the smaller screens.
There are a few differences between mouse- and touch-based interaction:
vhf.dxview.org
#hamradio
There are a few differences between mouse- and touch-based interaction:
vhf.dxview.org
#hamradio
The VHF propagation map will start showing more activity. A coding error when translating from Rails to Rust caused some activity to be filtered inappropriately.
vhf.dxview.org
#hamradio
vhf.dxview.org
#hamradio
September 4, 2025 at 10:58 PM
The VHF propagation map will start showing more activity. A coding error when translating from Rails to Rust caused some activity to be filtered inappropriately.
vhf.dxview.org
#hamradio
vhf.dxview.org
#hamradio
Today some corrections and enhancements were applied to the VHF propagation map.
The changes improve the interaction as the pointer is moved over active stations. A white outline adds contrast to the footprint and when selected the paths are clearly revealed.
vhf.dxview.org
#hamradio
The changes improve the interaction as the pointer is moved over active stations. A white outline adds contrast to the footprint and when selected the paths are clearly revealed.
vhf.dxview.org
#hamradio
August 30, 2025 at 11:15 PM
Today some corrections and enhancements were applied to the VHF propagation map.
The changes improve the interaction as the pointer is moved over active stations. A white outline adds contrast to the footprint and when selected the paths are clearly revealed.
vhf.dxview.org
#hamradio
The changes improve the interaction as the pointer is moved over active stations. A white outline adds contrast to the footprint and when selected the paths are clearly revealed.
vhf.dxview.org
#hamradio
ANNOUNCEMENT: The HF propagation map now has an option to display the gray line. This feature is activated with a checkbox in the main menu.
hf.dxview.org
#HamRadio
hf.dxview.org
#HamRadio
August 28, 2025 at 11:09 PM
ANNOUNCEMENT: The HF propagation map now has an option to display the gray line. This feature is activated with a checkbox in the main menu.
hf.dxview.org
#HamRadio
hf.dxview.org
#HamRadio
Of all the the lighthouses on the air this past weekend, 7S0SFJ in Sweden is one of the unique ones. The station is on the "Finngrundet," a lightship that was in service from 1903 to 1969.
www.sjohistoriska.se/en/visit/the...
#hamradio #lighthouse
www.sjohistoriska.se/en/visit/the...
#hamradio #lighthouse
August 19, 2025 at 1:33 AM
Of all the the lighthouses on the air this past weekend, 7S0SFJ in Sweden is one of the unique ones. The station is on the "Finngrundet," a lightship that was in service from 1903 to 1969.
www.sjohistoriska.se/en/visit/the...
#hamradio #lighthouse
www.sjohistoriska.se/en/visit/the...
#hamradio #lighthouse
Here is an unexpected mid-ocean HF propagation data point. KQ6RS reports this WSPR equipped buoy drifting in the North Atlantic is a high school project. During your station's off time, set up WSPR on 20m to see if it picks up the 0.01W signal!
www.qrz.com/db/KQ6RS
hf.dxview.org
#hamradio
www.qrz.com/db/KQ6RS
hf.dxview.org
#hamradio
July 26, 2025 at 11:05 PM
Here is an unexpected mid-ocean HF propagation data point. KQ6RS reports this WSPR equipped buoy drifting in the North Atlantic is a high school project. During your station's off time, set up WSPR on 20m to see if it picks up the 0.01W signal!
www.qrz.com/db/KQ6RS
hf.dxview.org
#hamradio
www.qrz.com/db/KQ6RS
hf.dxview.org
#hamradio
VY0ERC is another far-north amateur operation on the HF propagation map. The club station is at the Eureka Weather Station on Ellesmere Island in Nunavut (Canada). Listen for them on FT8.
FT8 activity: rbn.telegraphy.de/activity/VY0...
Ellesmere propagation: hf.dxview.org/perspective/...
#hamradio
FT8 activity: rbn.telegraphy.de/activity/VY0...
Ellesmere propagation: hf.dxview.org/perspective/...
#hamradio
July 25, 2025 at 1:44 AM
VY0ERC is another far-north amateur operation on the HF propagation map. The club station is at the Eureka Weather Station on Ellesmere Island in Nunavut (Canada). Listen for them on FT8.
FT8 activity: rbn.telegraphy.de/activity/VY0...
Ellesmere propagation: hf.dxview.org/perspective/...
#hamradio
FT8 activity: rbn.telegraphy.de/activity/VY0...
Ellesmere propagation: hf.dxview.org/perspective/...
#hamradio
I see what is going on. It will take a while to implement, test and upload the new code. Maybe in 12 hours it will be fixed.
July 24, 2025 at 1:31 AM
I see what is going on. It will take a while to implement, test and upload the new code. Maybe in 12 hours it will be fixed.
Have you ever wondered why the HF map has propagation from the far north? Polarstern is a German polar research vessel. It is active as DP0POL using WSPR on 7, 10, 14, and 18 MHz. Today it is above 84º N latitude.
Follow DP0POL on WSPR: www.wsprnet.org/olddb?mode=h...
hf.dxview.org
#hamradio
Follow DP0POL on WSPR: www.wsprnet.org/olddb?mode=h...
hf.dxview.org
#hamradio
July 24, 2025 at 1:06 AM
Have you ever wondered why the HF map has propagation from the far north? Polarstern is a German polar research vessel. It is active as DP0POL using WSPR on 7, 10, 14, and 18 MHz. Today it is above 84º N latitude.
Follow DP0POL on WSPR: www.wsprnet.org/olddb?mode=h...
hf.dxview.org
#hamradio
Follow DP0POL on WSPR: www.wsprnet.org/olddb?mode=h...
hf.dxview.org
#hamradio
The prediction produced when "MUF" is selected at the top of the map shows which band has the best signal for each hour of the day.
A color coded area at the bottom shows the optimal frequency. By moving the pointer across this area the band number is indicated in the middle of the prediction box.
A color coded area at the bottom shows the optimal frequency. By moving the pointer across this area the band number is indicated in the middle of the prediction box.
July 18, 2025 at 12:58 AM
The prediction produced when "MUF" is selected at the top of the map shows which band has the best signal for each hour of the day.
A color coded area at the bottom shows the optimal frequency. By moving the pointer across this area the band number is indicated in the middle of the prediction box.
A color coded area at the bottom shows the optimal frequency. By moving the pointer across this area the band number is indicated in the middle of the prediction box.
When an HF propagation prediction finds that long path signals will be stronger, they are used in the chart. Gray bands indicate when long path is used.
Long path denotes a signal that is strongest coming the long way around the world (180º from the expected direction).
hf.dxview.org
#HamRadio
Long path denotes a signal that is strongest coming the long way around the world (180º from the expected direction).
hf.dxview.org
#HamRadio
July 18, 2025 at 12:58 AM
When an HF propagation prediction finds that long path signals will be stronger, they are used in the chart. Gray bands indicate when long path is used.
Long path denotes a signal that is strongest coming the long way around the world (180º from the expected direction).
hf.dxview.org
#HamRadio
Long path denotes a signal that is strongest coming the long way around the world (180º from the expected direction).
hf.dxview.org
#HamRadio
The HF propagation predictions charts are working better after correcting errors introduced in the conversion to Rust.
The chart shows hours of the day going from left to right, starting at 0000Z (UTC). The red vertical bar is the current time.
Color coding shows SSB, CW, FT8 or WSPR.
#HamRadio
The chart shows hours of the day going from left to right, starting at 0000Z (UTC). The red vertical bar is the current time.
Color coding shows SSB, CW, FT8 or WSPR.
#HamRadio
July 18, 2025 at 12:58 AM
The HF propagation predictions charts are working better after correcting errors introduced in the conversion to Rust.
The chart shows hours of the day going from left to right, starting at 0000Z (UTC). The red vertical bar is the current time.
Color coding shows SSB, CW, FT8 or WSPR.
#HamRadio
The chart shows hours of the day going from left to right, starting at 0000Z (UTC). The red vertical bar is the current time.
Color coding shows SSB, CW, FT8 or WSPR.
#HamRadio
Drawing areas of propagation that cross the 180th meridian (International Date Line) on the HF map have always been a mathematical challenge. A bit ago an update was uploaded that finally gets it right (I think). Errors had been showing up particularly on 20 meters.
hf.dxview.org
#hamradio
hf.dxview.org
#hamradio
July 13, 2025 at 1:45 AM
Drawing areas of propagation that cross the 180th meridian (International Date Line) on the HF map have always been a mathematical challenge. A bit ago an update was uploaded that finally gets it right (I think). Errors had been showing up particularly on 20 meters.
hf.dxview.org
#hamradio
hf.dxview.org
#hamradio
The HF propagation map is now running on all Rust code.
An error in the activity view resulted in missing data, including a blank map for 10 Mhz. That and some other minor things have been fixed.
hf.dxview.org
#hamradio
An error in the activity view resulted in missing data, including a blank map for 10 Mhz. That and some other minor things have been fixed.
hf.dxview.org
#hamradio
July 8, 2025 at 11:18 PM
The HF propagation map is now running on all Rust code.
An error in the activity view resulted in missing data, including a blank map for 10 Mhz. That and some other minor things have been fixed.
hf.dxview.org
#hamradio
An error in the activity view resulted in missing data, including a blank map for 10 Mhz. That and some other minor things have been fixed.
hf.dxview.org
#hamradio
Ever since switching the VHF (APRS) data gathering app to Rust there has been a persistent memory leak.
I finally had time to dig in and resolve the problem. Now it stays around the 150-160M range. In contrast the HF data gathering app, sits around 100M.
vhf.dxview.org
#hamradio
I finally had time to dig in and resolve the problem. Now it stays around the 150-160M range. In contrast the HF data gathering app, sits around 100M.
vhf.dxview.org
#hamradio
July 2, 2025 at 9:23 PM
Ever since switching the VHF (APRS) data gathering app to Rust there has been a persistent memory leak.
I finally had time to dig in and resolve the problem. Now it stays around the 150-160M range. In contrast the HF data gathering app, sits around 100M.
vhf.dxview.org
#hamradio
I finally had time to dig in and resolve the problem. Now it stays around the 150-160M range. In contrast the HF data gathering app, sits around 100M.
vhf.dxview.org
#hamradio