SKYWAVE DX
SDR-9900 PROTactical HF Propagation & Split-VFO Pileup Command
SFI
145
SSN
112
Kp
2
QUIET IONOSPHERE
UTC Time
00:00:00Z
DX Score
0
DX TARGET
3Y0K
MOST WANTED #2
Bouvet Island • Grid JD15
GREAT CIRCLE
138° SE
PATH DIST
12,450 km
OPT BANDS
20m / 15m
RX DECODER COPY
LISTENING UP
CQ DX DE 3Y0K 3Y0K UP 1-4 K
SKYWAVE IONOSPHERIC RAY-TRACER
MUF: 24.8 MHz
LUF: 5.2 MHz
PATH: LOCKED (-6dB)
D-Layer (60-90km Absorp)
Es Sporadic-E (110km)
F2 Layer (250-400km)
PATH: DAYLIGHT
HF/VHF Band Select
(Keys 1-6)
Take-Off Angle (Elev)
14° (Low DX Hop)
3° Long DX
25° Med
45° NVIS/Short
Yagi Beam Azimuth
138°
0° N
90° E
180° S
270° W
RX SIGNAL / S-METER
S7 (-79 dBm)
S1S3S5S7S9+20+40dB
Space WX Injection
SDR PANADAPTER & PILEUP WATERFALL
▼ VFO A (DX RX)
▼ VFO B (YOUR TX)
◎ DX EAR ("599 TU")
+0.0 kHz (DX Base)
+1.0 kHz
+2.0 kHz (Pileup Zone)
+3.0 kHz
+4.0 kHz
+5.0 kHz
VFO A • RX
CW-U 250Hz
14.025.00
DX TRANSMIT FREQ
LOCKED
VFO B • SPLIT TX
UP +1.85 kHz
14.026.85
CLEAR FREQUENCY
SPLIT ON
VFO B Split Offset (+0.00 to +5.00 kHz)
QSO Tactical Diagnostics
READY TO WORK DX
1. Align Band & Take-Off Angle so your yellow skywave beam hits the DX station.
2. Tune VFO B near the green "599 TU" marker in a clear hole & press TX CALL when DX listens!
2. Tune VFO B near the green "599 TU" marker in a clear hole & press TX CALL when DX listens!
IONO HOP: --
BEAM AZ: --
SPLIT VFO: --
DX EAR: --
DXCC Station Logbook
0 QSOs
BEST SCORE: 0
| UTC | Callsign | DXCC Entity | Freq / Band | Mode | RST | Distance | Pts |
|---|
SKYWAVE DX — OPERATOR'S MANUAL
1. Ionospheric Ray-Tracing (Left Display): High Frequency (HF) skywaves refract off the ionized F2 and E layers. Select a Band (80m–6m) and adjust your Take-Off Angle (3°–45°) so your yellow multi-hop ray bounces cleanly onto the red DXpedition target flag at the right edge of the globe.
- Frequency Too High (> MUF): Wave penetrates right through the F2 layer into space! Drop down to a lower frequency band.
- Frequency Too Low (< LUF): Absorbed by daytime D-Layer ionization (especially during an X-Class Solar Flare).
- 6m / 10m Magic Band: Requires high Solar Flux (SFI) or a dense cyan Sporadic-E (Es) cloud at 110km altitude.
2. Busting the Split-VFO Pileup (Right Waterfall): Rare DXpeditions never listen on their own transmit frequency (VFO A at +0.0 kHz) because hundreds of stations are calling at once! They transmit CQ DX UP 1-4.
- Keep SPLIT ON and watch the waterfall for the green ◎ DX EAR ("599 TU") marker showing where the DX operator just worked someone.
- The DX operator usually steps up +0.10 to +0.25 kHz after each QSO, or tunes near their last listening spot.
- Click the waterfall or drag the VFO B dial into a clear slot right on the DX Ear marker, wait for the DX station to finish sending CQ (LISTENING UP), and press TX CALL (Spacebar)!
Keyboard Shortcuts: 1-6 Select Band • ← / → Tune VFO B • ↑ / ↓ Adjust Take-Off Angle • SPACE Transmit Callsign.
