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10-12-2004, 02:06 AM
<span style='color:red'><span style='font-size:15pt;line-height:100%'>Tropospheric Ducting Forecast
Folks I have added something new to the forcast so please read the whole forcast. The new additions are at the bottom.
Folks the Tropo is looking good for the next 5 days so, I suggest you break out the beams,dipoles and your all mode UHF/VHF rigs and prepare to make some contacts.
Tropo is currently showing for Monday from the Delmarva South to the FL coast conditions will range from Fair to Good. With the best conditions off the SC Coast. And from the coast inland towards the North West conditions will range from Fair to Good. With Poor to Modrate conditions in the SouthWest.
For Tuesday expect pretty much a carbon copy of Monday with the exception that the Tropo will drop to Poor from the Sothern NC Coast Line to the SC/GA State line. From the GA/SC Line South conditions will range from Fair to Strong.
For Wed the Tropo is expected to improve from Southern Maine to the Jersey Coast with conditions ranging from Fair to Good. From Va. to NC state line Fair to Modrate conditions along the coast. From the NC to SC state lines conditions will be poor. South From the NC/SC state lines and down the FL Coast conditions will improve and range from Fair to Very Strong in Southern Fl. Looking From Va to Maine Inland conditions to the North West will range from Fair to Good. Conditions will be poor towards the Southwest.
For Thursday Expect Fair to Good Conditions from Prince Edward Island Canada to the NJ coast. And from the NJ coast South expect Modrate to Good conditions from the Delmarva all the way to the Fl coast. With the best conditions from the Jersey coast to the Delmarva. Looking inland conditions will drop off from Good to Poor looking to the NorthWest, West and Parts of the Southwest.
At this point in time conditions for Friday are not looking good no matter how you look at it. From Maine to NH expect Poor conditions all the coast.
From NH South to FL expect Fair conditions.
Looking Inland from Maine SC expect Poor conditions in the North West, West and parts of the South West. From Ga to Fl looking Inland conditions will vary from Poor to Very Strong in the futher West you go.
VA Tropo
Mon - Fair To Good
Tues - Modrate To Good
Wed - Fair To Modrate
Thur - Poor To Modrate
Fri - Poor To Fair</span></span>
<span style='color:blue'><span style='font-size:11pt;line-height:100%'>Each Week I will try to add a little on Tropospheric Dx Modes in an effort to give a better understand as to how this forcast can help you in making 2 meter ssb, 70 cm ssb and 6 meter ssb DX Contacts. I'm not an expert and don't profess to be one. I know what I have studied in class and read. So, here goes.
"Tropo"
A Tropo DX mode is any condition that scatters, reflects or refracts signals in the Troposphere allowing DX to occur. Refraction occurs when the normal Index of Refraction has been altered. Vertical boundaries between different types of airmasses usually cause this..where a temperature inversion (warm air over cooler air) exists. However..the most important influencing factor is water vapour (humidity). Thus..a warm dry airmass on top of a cooler humid airmass produces the best conditions. Dry Mexican air flowing across the Gulf of Mexico or Dry Saharan air flowing across the Meditteranean are two examples of prime tropo-producing conditions. High pressure subsidence (the sinking and drying out of air)..if it occurs over the oceans..can produce reception across several thousands of km! Hawaii to California reception..both on UHF and VHF..is not as uncommon as one might think. On the other hand..high mountains can physically block tropo DX..and deserts are generally too dry for tropo. Thus..tropo is rare in the very mountainous or dry regions of the world.
As far as classifying DX..enhancement and ducting in particular form a grey line. As a rule of thumb..Enhancement is DX via inversions below 450 m (1500 ft) above ground...Ducting is DX via inversions above 450 m. (The layer of the troposphere below 450 m is called the "boundary layer" in meteorology).
Here are some things that I do to help me determine when the Tropo might be at it's best:
1. Look at the hourly weather forcats on the Weather Channel Web Site (weather.com) for my area and see when a inversion is most like to take place.
2. listen for beacons to the North and South. Beacons are usually low power and if you can hear them the there's a good possibility that Tropo is about.
3. if I hear other repeaters coming in on the same repeater frequiences as in my area this is a good sign of Tropo too.
4. Also FM radio broadcasts, anotherwords if you have distant stations interfearing with the local broadcast.
These are just some of the ways you can tell if Tropo is about.</span></span>
I don't want to anyone to reply with a nasty comment. This took awhile to do and I have put alot of effort into it. I hope it will to get people interested in trying 2 meter ssb.
Folks I have added something new to the forcast so please read the whole forcast. The new additions are at the bottom.
Folks the Tropo is looking good for the next 5 days so, I suggest you break out the beams,dipoles and your all mode UHF/VHF rigs and prepare to make some contacts.
Tropo is currently showing for Monday from the Delmarva South to the FL coast conditions will range from Fair to Good. With the best conditions off the SC Coast. And from the coast inland towards the North West conditions will range from Fair to Good. With Poor to Modrate conditions in the SouthWest.
For Tuesday expect pretty much a carbon copy of Monday with the exception that the Tropo will drop to Poor from the Sothern NC Coast Line to the SC/GA State line. From the GA/SC Line South conditions will range from Fair to Strong.
For Wed the Tropo is expected to improve from Southern Maine to the Jersey Coast with conditions ranging from Fair to Good. From Va. to NC state line Fair to Modrate conditions along the coast. From the NC to SC state lines conditions will be poor. South From the NC/SC state lines and down the FL Coast conditions will improve and range from Fair to Very Strong in Southern Fl. Looking From Va to Maine Inland conditions to the North West will range from Fair to Good. Conditions will be poor towards the Southwest.
For Thursday Expect Fair to Good Conditions from Prince Edward Island Canada to the NJ coast. And from the NJ coast South expect Modrate to Good conditions from the Delmarva all the way to the Fl coast. With the best conditions from the Jersey coast to the Delmarva. Looking inland conditions will drop off from Good to Poor looking to the NorthWest, West and Parts of the Southwest.
At this point in time conditions for Friday are not looking good no matter how you look at it. From Maine to NH expect Poor conditions all the coast.
From NH South to FL expect Fair conditions.
Looking Inland from Maine SC expect Poor conditions in the North West, West and parts of the South West. From Ga to Fl looking Inland conditions will vary from Poor to Very Strong in the futher West you go.
VA Tropo
Mon - Fair To Good
Tues - Modrate To Good
Wed - Fair To Modrate
Thur - Poor To Modrate
Fri - Poor To Fair</span></span>
<span style='color:blue'><span style='font-size:11pt;line-height:100%'>Each Week I will try to add a little on Tropospheric Dx Modes in an effort to give a better understand as to how this forcast can help you in making 2 meter ssb, 70 cm ssb and 6 meter ssb DX Contacts. I'm not an expert and don't profess to be one. I know what I have studied in class and read. So, here goes.
"Tropo"
A Tropo DX mode is any condition that scatters, reflects or refracts signals in the Troposphere allowing DX to occur. Refraction occurs when the normal Index of Refraction has been altered. Vertical boundaries between different types of airmasses usually cause this..where a temperature inversion (warm air over cooler air) exists. However..the most important influencing factor is water vapour (humidity). Thus..a warm dry airmass on top of a cooler humid airmass produces the best conditions. Dry Mexican air flowing across the Gulf of Mexico or Dry Saharan air flowing across the Meditteranean are two examples of prime tropo-producing conditions. High pressure subsidence (the sinking and drying out of air)..if it occurs over the oceans..can produce reception across several thousands of km! Hawaii to California reception..both on UHF and VHF..is not as uncommon as one might think. On the other hand..high mountains can physically block tropo DX..and deserts are generally too dry for tropo. Thus..tropo is rare in the very mountainous or dry regions of the world.
As far as classifying DX..enhancement and ducting in particular form a grey line. As a rule of thumb..Enhancement is DX via inversions below 450 m (1500 ft) above ground...Ducting is DX via inversions above 450 m. (The layer of the troposphere below 450 m is called the "boundary layer" in meteorology).
Here are some things that I do to help me determine when the Tropo might be at it's best:
1. Look at the hourly weather forcats on the Weather Channel Web Site (weather.com) for my area and see when a inversion is most like to take place.
2. listen for beacons to the North and South. Beacons are usually low power and if you can hear them the there's a good possibility that Tropo is about.
3. if I hear other repeaters coming in on the same repeater frequiences as in my area this is a good sign of Tropo too.
4. Also FM radio broadcasts, anotherwords if you have distant stations interfearing with the local broadcast.
These are just some of the ways you can tell if Tropo is about.</span></span>
I don't want to anyone to reply with a nasty comment. This took awhile to do and I have put alot of effort into it. I hope it will to get people interested in trying 2 meter ssb.