Here’s you’ll find links to a daily spectrogram for the NAVTEX MW sub-band, recorded at Cobh, Cork Harbour, Ireland, IO51uu during July 2026. I started saving these in June 2026. Spectra for previous months are available on the NAVTEX page.
Each spectrogram covers a 16h 44m period, that being the length of the longest night of the year here, with 15m added before sunset and after sunrise to capture enhanced reception that sometimes occurs around sunset or sunrise. Each spectrogram starts at 1608z and ends at 0852z the following morning.
Along with each image, there is also a processed version courtesy of my radio friend and keen NAVTEX DXer, SWL Tobias. Tobias has written software that takes my spectrogram as input, and processes it to create a high contrast version, to convert the timescale to UTC and to add NAVTEX slot letters. Thanks Tobias!
Each unprocessed spectrogram image is 2556×1569 pixels in size. Tobias’ processed images are 2048×2048 pixels in size:
- 2026-07-14_160803z_to_2026-07-15_085204z_navtex_band
High contrast, UTC version with navtex time-slots overlay - 2026-07-13_160803z_to_2026-07-14_085204z_navtex_band
High contrast, UTC version with navtex time-slots overlay - 2026-07-12_160803z_to_2026-07-13_085204z_navtex_band
High contrast, UTC version with navtex time-slots overlay - 2026-07-11_160803z_to_2026-07-12_085204z_navtex_band
High contrast, UTC version with navtex time-slots overlay - 2026-07-10_160803z_to_2026-07-11_085204z_navtex_band
High contrast, UTC version with navtex time-slots overlay - 2026-07-09_160803z_to_2026-07-10_085204z_navtex_band
High contrast, UTC version with navtex time-slots overlay - 2026-07-08_160803z_to_2026-07-09_085204z_navtex_band
High contrast, UTC version with navtex time-slots overlay - 2026-07-07_160803z_to_2026-07-08_085204z_navtex_band
High contrast, UTC version with navtex time-slots overlay - 2026-07-06_160803z_to_2026-07-07_085204z_navtex_band
High contrast, UTC version with navtex time-slots overlay - 2026-07-05_160803z_to_2026-07-06_085204z_navtex_band
High contrast, UTC version with navtex time-slots overlay - 2026-07-04_160803z_to_2026-07-05_085204z_navtex_band
High contrast, UTC version with navtex time-slots overlay - 2026-07-03_160803z_to_2026-07-04_085204z_navtex_band
High contrast, UTC version with navtex time-slots overlay - 2026-07-02_160803z_to_2026-07-03_085204z_navtex_band
High contrast, UTC version with navtex time-slots overlay - 2026-07-01_160803z_to_2026-07-02_085204z_navtex_band
High contrast, UTC version with navtex time-slots overlay
