[SFDXA] W4HM Daily HF-MF Radio Wave Propagation Forecast #2019-109

[Bill]

*#109 issued Thursday April 18, 2019 at 1430 UTC*

**

*GLOBAL (HF-MF 3000-30000 kHz- 300-3000 kHz) RADIO WAVE PROPAGATION 
CONDITIONS EXPECTED-***

**

*Radio wave propagation condition “trend” on Apr 18, 2019- steady*

**

*Radio wave propagation condition “trend” on Apr 19, 2019- steady.*

**

*Radio wave propagation condition “trend” on Apr 20, 2019- steady.*

**

**

*NORTHERN HEMISPHERE HF RADIO WAVE PROPAGATION FORECAST *g*-*

**

*Received RF signal strength scale-*

**

*Very Good- +1 over S9 or greater*

*Good- S7-9*

*Fair- S4-6*

*Poor- S1-3*

*Very Poor- S0*

**

*3150-3400, 3500-4100, 4750-5050, 5700-6300 kHz- S9 at night and S1-2 at 
day,

6900-7800, 9200-9995, 10000-10150, 11500-12200 kHz- S9+ 1 at night and
S4-7 at day,

13570-13850, 14000-14350, 15005-15900, 17450-17950, 18068-18168 kHz- S0 
at night and S4-6 at day,

21000-21850 kHz- S0 at night and S1-2 at day,

24890-24990, 25600-26100 kHz- S0 at night and S0-1 at day,

*

*28000-29700 kHz- S0 at night and S0 at day.*

**

**

*SOUTHERN HEMISPHERE HF RADIO WAVE PROPAGATION FORECAST *g*-*

**

*3150-3400, 3500-4100, 4750-5050, 5700-6300 kHz- S9 at night and S1-2 at 
day,

6900-7800, 9200-9995, 10000-10150, 11500-12200 kHz- S9+ 1 at night and
S4-7 at day,

13570-13850, 14000-14350, 15005-15900, 17450-17950, 18068-18168 kHz- S0 
at night and S4-6 at day,

21000-21850 kHz- S0 at night and S1-2 at day,

24890-24990, 25600-26100 kHz- S0 at night and S0-1 at day,

*

*28000-29700 kHz- S0 at night and S0 at day.*

**

*GLOBAL (MF) (300-3000 KHZ) RADIO WAVE PROPAGATION CONDITIONS EXPECTED-*

**

*Received RF signal strength scale-*

**

*Very Good- +1 over S9 or greater*

*Good- S7-9*

*Fair- S4-6*

*Poor- S1-3*

*Very Poor- S0*

**

**

*FORECASTED NORTHERN HEMISPHERE SHORT PATH-*

*-East <-> West To 1100 Mi /1800 km *

	

*S7-8*

**North <-> South To 1100 Mi /1800 km*

	

*S8-9*

*+South <-> North To 1100 Mi /1800 km*

	

*S5-7*

*
**FORECASTED SOUTHERN HEMISPHERE SHORT PATH-*

*-East <-> West To 1100 Mi / 1800 km*

	

*S7-8*

**South <-> North To 1100 Mi /1800 km*

	

*S8-9*

*+North <-> South To 1100 Mi / 1800 km*

	

*S5-7*

*FORECASTED GREAT CIRCLE LONG OR SKEWED PATH- *

*Northern Hemisphere (TA) Trans Atlantic, (TI) Trans Indian, (TP) Trans 
Pacific and cross Equatorial propagation conditions in**excess of 
approximately 3200 mi / 5200 km-*

*High Latitude*

	

*S2-3*

*Mid Latitude*

	

*S8-9*

*Low latitude*

	

*S2-3*

**

*FORECASTED GREAT CIRCLE LONG OR SKEWED PATH- *

*Southern Hemisphere (TA) Trans Atlantic, (TI) Trans Indian, (TP) Trans 
Pacific and cross Equatorial propagation conditions in**excess of 
approximately 3200 mi / 5200 km-*

*High Latitude*

	

*S2-3*

*Mid Latitude*

	

*S8-9*

*Low latitude*

	

*S2-3*

**

**

*Received RF signal strength scale-*

**

*Very Good- +1 over S9 or greater*

*Good- S7-9*

*Fair- S4-6*

*Poor- S1-3*

*Very Poor- S0*

**

*This HF-MF Radio wave propagation forecast is produced based on the 
SIGINT_CAP HF-MF radio wave propagation prediction software. X and O ray 
tracing is included.*

*I wrote it beginning in the late 1980’s but I’m sorry to say that it 
still can’t be distributed to the general public. It does outperform VOA 
CAP and Prop Lab.*

*I do check the actual band conditions at my location in the USA and 
tweak the forecast manually where and when necessary.*

**

*I also check global HF-MF radio wave propagation conditions via remoted 
radio*

*receivers on every continent of the globe and tweak the forecast 
manually if*

*and when necessary.*

**

*And last but not least I look at ionsonde stations on every continent 
of the*

*globe.*

**

*The hamateur radio JT65A mode RF signal levels received are based on 5 
watts*

*and ½ wave dipole up at 40 feet.*

**

*The hamateur radio PSK31 mode RF signal levels received are based on 25*

*watts and ½ wave dipole up at 40 feet.*

**

*The hamateur radio CW mode RF signal levels received are based on 50 watts*

*and ½ wave dipole up at 40 feet.*

**

*The hamateur radio SSB RF mode signal levels received are based on 100 
watts*

*and ½ wave dipole up at 40 feet.*

**

*The HF shortwave broadcast band AM Mode RF signal levels are based on*

*100,000 watts (100 kw) and a typical high gain VOA type curtain array*

*antenna.*

**

*The MF broadcast band AM Mode RF signal levels are based on 50,000 
watts (50 kw) and an omnidirectional vertical antenna.*

**

*Please keep in mind that this is a relatively simplified HF-MF radio wave*

*propagation forecast, so as to keep it easily understandable and 
applicable*

*by the average radio enthusiast.*

**

*Standard Disclaimer-*

**

*Note! I use error prone RAW public domain data from the NOAA Space*

*Environment Center, other U.S. government entities and educational*

*institutions, to produce this daily HF-MF radio wave propagation*

*forecast. This data is gathered and made public by the U.S. Government 
using*

*taxpayer $$$ (including mine).*

**

*However this daily HF-MF propagation forecast that I produce from the RAW*

*public domain data is my personal intellectual property. Therefore this*

*daily HF-MF radio wave propagation forecast contained herein is 
copyrighted ©*

*1988-2019 by Thomas F. Giella, W4HM.*

**

*Feel free without prior permission to redistribute this daily HF-MF 
radio wave*

*propagation forecast, as long as you redistribute it in its entirety and*

*give me credit for it.*

**

*Also HF-MF radio wave propagation forecasting is still an inexact*

*science and therefore also an art. The forecasts are not official but for*

*educational and hobby related purposes only and are subject to human error*

*and acts of God, therefore no guarantee or warranty implied.*