Grid GD78 Band Conditions — South America
Localized HF conditions for Maidenhead locator GD78. Coordinating at -51.50°, -45.00°. Updated with real-time telemetry from NOAA and DX cluster reports.
GD78 conditions are FAIR. Best bands: 10m, 20m, 30m, 40m, 60m. SFI: 137.
From South America operating area, work the 10:51 UTC and 19:23 UTC grayline windows: probe 20m, 30m, and 40m in the 15 minutes either side while the terminator crosses GD78.
10m is the headline band right now, with 20m as the dependable fallback if conditions soften.
This square sits in South America footprint and is best used as a planning center for portable, field-day, and home-station band decisions.
- Latitude zone
- upper mid-latitude
- Local phase
- Daylight
- Aurora exposure
- low at this latitude
- Grayline
- 10:51 UTC / 19:23 UTC
- Best high band
- 10m
- Nearest city
- South America operating area
● Local Band Quality Scorings
Use this local score for GD78, then compare the global live ranking oncurrent ham band conditionsbefore changing bands.
● Best DX Windows from GD78 — South America operating area
Great-circle distance, short-path beam heading, the bands most likely open right now from GD78 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 | 2,623 mi | 339° | 10m, 15m, 20m | Open now |
| Southern Africa | 4,029 mi | 93° | 10m, 15m, 20m | Open now |
| Oceania | 6,732 mi | 193° | 10m, 15m, 20m | Open now |
| North America | 7,021 mi | 321° | 10m, 15m, 20m | Open now |
| Europe | 7,719 mi | 35° | 10m, 15m, 20m | Open now |
| South Asia | 8,803 mi | 102° | 10m, 15m, 20m | Open now |
| East Asia / Japan | 11,356 mi | 189° | 10m, 15m, 20m | Open now |
● Band-by-Time Plan for GD78
A planning heuristic for the local day at GD78, built from sunrise 10:51 UTC, sunset 19:23 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 GD78 and the adjacent squares
These are the newest 10m, 15m, and 20m reports where one side of the path sits in GD78, GD79, GD77, GD88, GD68. 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
Worked All Europe - SSB starts Sat, 12 Sep 2026 00:00:00 GMT. Current forecast from GD78: 10m EXCELLENT, 15m EXCELLENT, 20m GOOD. Current solar conditions (SFI 137, K 3) favor 10m, 15m, 20m for this contest weekend.
Open contest calendarNearby grids