Grid HH99 Band Conditions
Localized HF conditions for Maidenhead locator HH99. Coordinating at -10.50°, -21.00°. Updated with real-time telemetry from NOAA and DX cluster reports.
HH99 conditions are FAIR. Best bands: 10m, 12m, 15m, 17m, 20m. SFI: 137.
From the HH99 operating area, work the 07:43 UTC and 19:19 UTC grayline windows: probe 20m, 30m, and 40m in the 15 minutes either side while the terminator crosses HH99.
Night operation should keep 20m on watch and move to 40m as the path darkens.
This square sits in a mixed-region footprint and is best used as a planning center for portable, field-day, and home-station band decisions.
- Latitude zone
- tropical
- Local phase
- Darkness
- Aurora exposure
- low at this latitude
- Grayline
- 07:43 UTC / 19:19 UTC
- Best high band
- 10m
- Nearest city
- the HH99 operating area
● Local Band Quality Scorings
Use this local score for HH99, then compare the global live ranking oncurrent ham band conditionsbefore changing bands.
● Best DX Windows from HH99 — the HH99 operating area
Great-circle distance, short-path beam heading, the bands most likely open right now from HH99 to each DX region at SFI 137 / Kp 3, and a current verdict. "Open now" means a suitable band is scoring well on that path; "Try ~HH:MM" points at the next far-end grayline. Band picks and status are a planning heuristic, not a measurement.
| Target | Distance | Beam | Bands to try | Status |
|---|---|---|---|---|
| South America | 2,510 mi | 259° | 40m, 20m, 80m | Open now |
| Southern Africa | 3,244 mi | 116° | 40m, 20m, 80m | Open now |
| Europe | 4,580 mi | 21° | 40m, 20m, 80m | Open now |
| North America | 5,992 mi | 311° | 10m, 15m, 20m | Open now |
| South Asia | 7,060 mi | 70° | 40m, 20m, 80m | Open now |
| Oceania | 9,575 mi | 168° | 40m, 20m, 80m | Open now |
| East Asia / Japan | 10,239 mi | 33° | 40m, 20m, 80m | Open now |
● Band-by-Time Plan for HH99
A planning heuristic for the local day at HH99, built from sunrise 07:43 UTC, sunset 19:19 UTC, SFI 137, and Kp 3. Not a measurement — a starting point for where to listen as the day turns.
Grayline enhancement — low bands reach long distances as the terminator passes.
High bands rising with the sun; check 10m for DX.
Peak high-band window — 10m and 15m open widest.
Second grayline peak — 20m holds, then hands off to 40m.
Low bands own the darkness — 40m for DX, 80m regional.
Recent local activity
Spots touching HH99 and the adjacent squares
These are the newest 10m, 15m, and 20m reports where one side of the path sits in HH99, HI90, HH98, IH09, HH89. This gives the page unique, local context instead of a generic solar snapshot.
Top DX targets
Where this grid is reaching right now
Contest preview
Next major contest outlook
No contest event is currently loaded. For planning from HH99, start with 10m POOR, 15m POOR, 20m FAIR and keep 20m available as the safest all-around fallback.
Open contest calendarNearby grids
Four adjacent squares for internal path checking
Regional hub links