OH6BG
@voacap.com
VOACAP (Voice of America Coverage Analysis Program) is free professional HF Propagation Prediction and Ionospheric Communications Analysis software.
I am thrilled to introduce #VOACAP Online for SWL – a free-of-charge dedicated shortwave propagation prediction service designed specifically for shortwave listeners (SWL). Accessible at www.voacap.com/swl/, this powerful online tool brings professional-grade propagation analysis to your fingertips.
November 22, 2025 at 6:45 PM
I am thrilled to introduce #VOACAP Online for SWL – a free-of-charge dedicated shortwave propagation prediction service designed specifically for shortwave listeners (SWL). Accessible at www.voacap.com/swl/, this powerful online tool brings professional-grade propagation analysis to your fingertips.
Notice #VOACAP Online users: In recent Chrome/Edge browser versions, SVG rendering of thin lines has regressed. VOACAP Online’s propagation wheels may look broken or jagged. Firefox/Safari display them correctly - use those for best results until Chromium fixes this.
November 20, 2025 at 8:24 PM
Notice #VOACAP Online users: In recent Chrome/Edge browser versions, SVG rendering of thin lines has regressed. VOACAP Online’s propagation wheels may look broken or jagged. Firefox/Safari display them correctly - use those for best results until Chromium fixes this.
Two exciting new DXpeditions have just been added to the #VOACAP DX Charts:
* S21SDX – Bangladesh (Nov 11–17, 2025)
* J38W – Grenada (Nov 23 – Dec 3, 2025)
Check them out at voacap.com/dx/ . Good DX and may the bands be open!
* S21SDX – Bangladesh (Nov 11–17, 2025)
* J38W – Grenada (Nov 23 – Dec 3, 2025)
Check them out at voacap.com/dx/ . Good DX and may the bands be open!
VOACAP DX Charts
voacap.com
November 11, 2025 at 7:56 PM
Two exciting new DXpeditions have just been added to the #VOACAP DX Charts:
* S21SDX – Bangladesh (Nov 11–17, 2025)
* J38W – Grenada (Nov 23 – Dec 3, 2025)
Check them out at voacap.com/dx/ . Good DX and may the bands be open!
* S21SDX – Bangladesh (Nov 11–17, 2025)
* J38W – Grenada (Nov 23 – Dec 3, 2025)
Check them out at voacap.com/dx/ . Good DX and may the bands be open!
NEWS! Generate VOACAP coverage maps fast with Go. Run Python predictions, then render MUF/REL/SNR50/SNR90/SDBW via plot_maps.go or via its compiled binary. Skips existing files, runs in parallel, shows progress. 216 maps take 2 minutes to plot (9 bands x 24 hours). Code: github.com/OH6BG/VOACAP...
GitHub - OH6BG/VOACAP_MAPS: Scripts to run VOACAP P2P prediction matrix, plot maps and store to database
Scripts to run VOACAP P2P prediction matrix, plot maps and store to database - OH6BG/VOACAP_MAPS
github.com
October 17, 2025 at 3:28 PM
NEWS! Generate VOACAP coverage maps fast with Go. Run Python predictions, then render MUF/REL/SNR50/SNR90/SDBW via plot_maps.go or via its compiled binary. Skips existing files, runs in parallel, shows progress. 216 maps take 2 minutes to plot (9 bands x 24 hours). Code: github.com/OH6BG/VOACAP...
Major update to my #VOACAP tools: github.com/OH6BG/VOACAP...
- run_p2p_matrix.py: safer, cleaner point-to-point predictions
- plot_maps.py: generates VOACAP coverage maps, now fully compatible with the HamCAP DX Charts framework I just updated yesterday. Demo: www.voacap.com/dx/cy0s/hamc...
- run_p2p_matrix.py: safer, cleaner point-to-point predictions
- plot_maps.py: generates VOACAP coverage maps, now fully compatible with the HamCAP DX Charts framework I just updated yesterday. Demo: www.voacap.com/dx/cy0s/hamc...
October 16, 2025 at 7:05 PM
Major update to my #VOACAP tools: github.com/OH6BG/VOACAP...
- run_p2p_matrix.py: safer, cleaner point-to-point predictions
- plot_maps.py: generates VOACAP coverage maps, now fully compatible with the HamCAP DX Charts framework I just updated yesterday. Demo: www.voacap.com/dx/cy0s/hamc...
- run_p2p_matrix.py: safer, cleaner point-to-point predictions
- plot_maps.py: generates VOACAP coverage maps, now fully compatible with the HamCAP DX Charts framework I just updated yesterday. Demo: www.voacap.com/dx/cy0s/hamc...
New release: HamCAP Maps → github.com/OH6BG/HamCAP... . A lightweight client-side viewer for #VOACAP coverage maps made with HamCAP: multi‑band, 3 time slots, lazy‑loading, LRU cache, keyboard access, theme toggle & zoom‑in‑tab. See 3Y0K Bouvet, Feb 2026 demo → www.voacap.com/dx/3y0k/hamc...
October 15, 2025 at 6:33 PM
New release: HamCAP Maps → github.com/OH6BG/HamCAP... . A lightweight client-side viewer for #VOACAP coverage maps made with HamCAP: multi‑band, 3 time slots, lazy‑loading, LRU cache, keyboard access, theme toggle & zoom‑in‑tab. See 3Y0K Bouvet, Feb 2026 demo → www.voacap.com/dx/3y0k/hamc...
NEWS: Launched an ADIF → Cabrillo Converter, a lightweight, single-file HTML/JS/CSS tool that runs 100% in your browser. Drag & drop (or browse) your ADIF file, click “Process,” then preview and download a Cabrillo log — no installations, no servers, no data leaks. 👉 github.com/OH6BG/OH6BG-...
October 13, 2025 at 7:25 PM
NEWS: Launched an ADIF → Cabrillo Converter, a lightweight, single-file HTML/JS/CSS tool that runs 100% in your browser. Drag & drop (or browse) your ADIF file, click “Process,” then preview and download a Cabrillo log — no installations, no servers, no data leaks. 👉 github.com/OH6BG/OH6BG-...
A lot of backend refactoring done at #VOACAP online (www.voacap.com/hf) to make the services more robust. Added new visual cues for ITU Wheel predictions: progress is now shown directly in the button w/ light red background color. Each run takes about 5 seconds, so a little patience is appreciated.
October 5, 2025 at 5:39 PM
A lot of backend refactoring done at #VOACAP online (www.voacap.com/hf) to make the services more robust. Added new visual cues for ITU Wheel predictions: progress is now shown directly in the button w/ light red background color. Each run takes about 5 seconds, so a little patience is appreciated.
Two upcoming operations now have their own dedicated propagation prediction sites at #VOACAP DX Charts (voacap.com/dx/), including VOACAP and ITURHFProp forecasts plus detailed sunrise/sunset times:
* 5K0UA – San Andres Island (Oct 20–30, 2025)
* FW5K – Wallis and Futuna (Oct 20 – Nov 7, 2025)
* 5K0UA – San Andres Island (Oct 20–30, 2025)
* FW5K – Wallis and Futuna (Oct 20 – Nov 7, 2025)
October 4, 2025 at 7:13 PM
Two upcoming operations now have their own dedicated propagation prediction sites at #VOACAP DX Charts (voacap.com/dx/), including VOACAP and ITURHFProp forecasts plus detailed sunrise/sunset times:
* 5K0UA – San Andres Island (Oct 20–30, 2025)
* FW5K – Wallis and Futuna (Oct 20 – Nov 7, 2025)
* 5K0UA – San Andres Island (Oct 20–30, 2025)
* FW5K – Wallis and Futuna (Oct 20 – Nov 7, 2025)
Opened a special propagation site for 5R8TT & 5R8XX Madagascar (Oct 29–Nov 12, 2025), now on the #VOACAP DX Charts list (voacap.com/dx/5r8tt/). Features VOACAP & ITURHFProp predictions, sunrise/sunset data, and an azimuthal equidistant map. Good DX!
VOACAP: 5R8TT Madagascar
voacap.com
September 27, 2025 at 1:30 PM
Opened a special propagation site for 5R8TT & 5R8XX Madagascar (Oct 29–Nov 12, 2025), now on the #VOACAP DX Charts list (voacap.com/dx/5r8tt/). Features VOACAP & ITURHFProp predictions, sunrise/sunset data, and an azimuthal equidistant map. Good DX!
Updated #VOACAP DX Charts with propagation predictions for 9L8MD Sierra Leone (Oct 30–Nov 10, 2025). As we heard, 3C2MD Equatorial Guinea was cancelled. But now a special site with VOACAP & ITURHFProp data + sunrise/sunset times is live for 9L8MD: voacap.com/dx/9l8md/ — Good DX!
VOACAP: 9L8MD Sierra Leone
voacap.com
September 27, 2025 at 8:42 AM
Updated #VOACAP DX Charts with propagation predictions for 9L8MD Sierra Leone (Oct 30–Nov 10, 2025). As we heard, 3C2MD Equatorial Guinea was cancelled. But now a special site with VOACAP & ITURHFProp data + sunrise/sunset times is live for 9L8MD: voacap.com/dx/9l8md/ — Good DX!
Update on #VOACAP DX Charts: New special prediction sites live!
- A52G Bhutan — Oct 1–8, 2025
- 3G0YR/CE0Y Easter Isl — Nov 26–Dec 3, 2025
Includes VOACAP/ITURHFProp propagation predictions, sunrise/sunset analysis + azimuthal equidistant maps. Good DX!
👉 voacap.com/dx/
- A52G Bhutan — Oct 1–8, 2025
- 3G0YR/CE0Y Easter Isl — Nov 26–Dec 3, 2025
Includes VOACAP/ITURHFProp propagation predictions, sunrise/sunset analysis + azimuthal equidistant maps. Good DX!
👉 voacap.com/dx/
September 25, 2025 at 4:48 PM
Update on #VOACAP DX Charts: New special prediction sites live!
- A52G Bhutan — Oct 1–8, 2025
- 3G0YR/CE0Y Easter Isl — Nov 26–Dec 3, 2025
Includes VOACAP/ITURHFProp propagation predictions, sunrise/sunset analysis + azimuthal equidistant maps. Good DX!
👉 voacap.com/dx/
- A52G Bhutan — Oct 1–8, 2025
- 3G0YR/CE0Y Easter Isl — Nov 26–Dec 3, 2025
Includes VOACAP/ITURHFProp propagation predictions, sunrise/sunset analysis + azimuthal equidistant maps. Good DX!
👉 voacap.com/dx/
To keep www.voacap.com and all its online services running smoothly, a quick bot check may appear on your first visit — and occasionally after. It helps block automated traffic and ensures real users get fast access. Thanks for your patience and understanding!
Making sure you're not a bot!
www.voacap.com
August 20, 2025 at 6:55 PM
To keep www.voacap.com and all its online services running smoothly, a quick bot check may appear on your first visit — and occasionally after. It helps block automated traffic and ensures real users get fast access. Thanks for your patience and understanding!
Update on #VOACAP DX Charts (voacap.com/dx/): OJ0YL & OJ0W Märket Reef DXpedition (Sep 20–26, 2025), IOTA EU-053; 160M-6M; CW, FT8, SSB. Special VOACAP site at voacap.com/dx/oj0yl/, in-depth propagation analysis, sunrise/sunset times. If they land early, they participate in SAC CW. Good DX!
August 16, 2025 at 8:28 AM
Update on #VOACAP DX Charts (voacap.com/dx/): OJ0YL & OJ0W Märket Reef DXpedition (Sep 20–26, 2025), IOTA EU-053; 160M-6M; CW, FT8, SSB. Special VOACAP site at voacap.com/dx/oj0yl/, in-depth propagation analysis, sunrise/sunset times. If they land early, they participate in SAC CW. Good DX!
New special detailed sites on #VOACAP DX Charts for KH9/K9HEI Wake (Aug), 3G0XQ San Ambrosio (Oct/Nov), PY0S St. Peter & St. Paul (Oct/Nov), PJ6Y Saba (Oct 17–29), 9U1RU Burundi (Oct 29 – Nov 19), PJ7UK St Maarten (Nov 28 – Dec 7), CY0S Sable (March 2026) and VP0SG So. Georgia (March 2027). Gud DX!
August 14, 2025 at 7:38 PM
New special detailed sites on #VOACAP DX Charts for KH9/K9HEI Wake (Aug), 3G0XQ San Ambrosio (Oct/Nov), PY0S St. Peter & St. Paul (Oct/Nov), PJ6Y Saba (Oct 17–29), 9U1RU Burundi (Oct 29 – Nov 19), PJ7UK St Maarten (Nov 28 – Dec 7), CY0S Sable (March 2026) and VP0SG So. Georgia (March 2027). Gud DX!
Excited to unveil the fresh layout for #VOACAP DX Charts! Now featuring light & dark mode, collapsible Antennas & Featured DX sites sections. Dedicated VOACAP prediction sites also got a sleek upgrade! Dive in at voacap.com/dx/
August 12, 2025 at 8:17 PM
Excited to unveil the fresh layout for #VOACAP DX Charts! Now featuring light & dark mode, collapsible Antennas & Featured DX sites sections. Dedicated VOACAP prediction sites also got a sleek upgrade! Dive in at voacap.com/dx/
#VOACAP DX Charts updated! Now featuring predictions for 3C0W Annobon & 3C3W Equatorial Guinea (Sep 2025). Get in-depth, band-specific predictions & sunrise/sunset times for September. voacap.com/dx/ ...Good DX!
August 9, 2025 at 6:19 PM
#VOACAP DX Charts updated! Now featuring predictions for 3C0W Annobon & 3C3W Equatorial Guinea (Sep 2025). Get in-depth, band-specific predictions & sunrise/sunset times for September. voacap.com/dx/ ...Good DX!
The #VOACAP Online band-by-band analysis (menu: Point-to-Point > VOA Band-by-Band) code is completely rewritten. Get interactive short/long-path overviews, day/night visualizations for TX/RX/midpoint (15th day of month), and detailed band-specific predictions. voacap.com/hf/
August 7, 2025 at 6:24 PM
The #VOACAP Online band-by-band analysis (menu: Point-to-Point > VOA Band-by-Band) code is completely rewritten. Get interactive short/long-path overviews, day/night visualizations for TX/RX/midpoint (15th day of month), and detailed band-specific predictions. voacap.com/hf/
#VOACAP DX Charts are updated for the FP5KE DXpedition to St Pierre & Miquelon (Sep 15-26, 2025). The F6KOP radio club's 16 operators will be on all bands/modes. A special site offers detailed predictions and sunrise/sunset times to aid in low-band forecasting at voacap.com/dx/fp5ke/
August 5, 2025 at 6:57 PM
#VOACAP DX Charts are updated for the FP5KE DXpedition to St Pierre & Miquelon (Sep 15-26, 2025). The F6KOP radio club's 16 operators will be on all bands/modes. A special site offers detailed predictions and sunrise/sunset times to aid in low-band forecasting at voacap.com/dx/fp5ke/
New ham radio PHP scripts! Calculate distance/bearing (Haversine & Vincenty), Maidenhead grid locators, and sun times (sunrise, sunset, etc.). Check them out! github.com/OH6BG/hamPHP/
GitHub - OH6BG/hamPHP: Various PHP scripts for amateur radio purposes
Various PHP scripts for amateur radio purposes. Contribute to OH6BG/hamPHP development by creating an account on GitHub.
github.com
July 25, 2025 at 3:26 PM
New ham radio PHP scripts! Calculate distance/bearing (Haversine & Vincenty), Maidenhead grid locators, and sun times (sunrise, sunset, etc.). Check them out! github.com/OH6BG/hamPHP/
Dave Straube's (N7LKL) SOTA Weatherbot is now upgraded with VOACAP propagation predictions tailored to your specific summit and date. You'll receive a chart showing the best CW and SSB band openings using QRP to help plan your activation. For more info, please go to sotaweatherbot.wordpress.com.
SOTA Weatherbot
Automated summit weather forecasts for SOTA activators.
sotaweatherbot.wordpress.com
July 14, 2025 at 5:27 PM
Dave Straube's (N7LKL) SOTA Weatherbot is now upgraded with VOACAP propagation predictions tailored to your specific summit and date. You'll receive a chart showing the best CW and SSB band openings using QRP to help plan your activation. For more info, please go to sotaweatherbot.wordpress.com.
VOACAP DX Charts (voacap.com/dx/) have been updated with predictions for the upcoming PY0S St. Peter & St. Paul Rocks DXpedition (Oct/Nov 2025).
A full-featured service, with detailed analysis and precise sunrise/sunset times, will be made available as soon as the team announces their exact dates.
A full-featured service, with detailed analysis and precise sunrise/sunset times, will be made available as soon as the team announces their exact dates.
June 30, 2025 at 6:18 PM
VOACAP DX Charts (voacap.com/dx/) have been updated with predictions for the upcoming PY0S St. Peter & St. Paul Rocks DXpedition (Oct/Nov 2025).
A full-featured service, with detailed analysis and precise sunrise/sunset times, will be made available as soon as the team announces their exact dates.
A full-featured service, with detailed analysis and precise sunrise/sunset times, will be made available as soon as the team announces their exact dates.
#VOACAP DX Charts Update! New azimuthal equidistant maps show bearing & distance to selected DXpeditions (under "VOACAP Prediction Site"), centered on YOUR QTH! The maps are interactive & downloadable as PNG.
Check it out: voacap.com/dx/
Check it out: voacap.com/dx/
June 2, 2025 at 7:01 PM
#VOACAP DX Charts Update! New azimuthal equidistant maps show bearing & distance to selected DXpeditions (under "VOACAP Prediction Site"), centered on YOUR QTH! The maps are interactive & downloadable as PNG.
Check it out: voacap.com/dx/
Check it out: voacap.com/dx/
Heads up, DX community! An update regarding #VOACAP DX Charts: 3G0XQ from San Ambrosio (San Félix) is scheduled for October/November 2025.
This is a rare entity. A dedicated propagation prediction site will be available closer to the DXpedition.
Good DX!
This is a rare entity. A dedicated propagation prediction site will be available closer to the DXpedition.
Good DX!
May 18, 2025 at 7:09 PM
Heads up, DX community! An update regarding #VOACAP DX Charts: 3G0XQ from San Ambrosio (San Félix) is scheduled for October/November 2025.
This is a rare entity. A dedicated propagation prediction site will be available closer to the DXpedition.
Good DX!
This is a rare entity. A dedicated propagation prediction site will be available closer to the DXpedition.
Good DX!
Ready to conquer airwaves & DX stations? My CCF/OHDXF presentation unlocks #VOACAP secrets: decipher Signal Power distributions, leverage MUFday values & tap into its best services. PLUS, harness ClubLog's smart QSO-based predictions! The PDF is here: www.voacap.com/2023/documen...
May 11, 2025 at 5:51 PM
Ready to conquer airwaves & DX stations? My CCF/OHDXF presentation unlocks #VOACAP secrets: decipher Signal Power distributions, leverage MUFday values & tap into its best services. PLUS, harness ClubLog's smart QSO-based predictions! The PDF is here: www.voacap.com/2023/documen...