[NLRS] ND Baloon Launch - August 27th

[Andrew T. Flowers, K0SM]

Many of those balloon flights reach 70,000 ft, sometimes even 100,000 
ft, so you should have no trouble getting a line-of-sight path to it.  
In fact, you can use the RainScatter program to see what a 70,000ft 
footprint looks like.  Just enter one of the locations and draw the 
70,000ft "fisheye" from the menu.  I have an equasion around here 
somewhere that can caluculate elevation angle from distance and altitude 
if anyone is interested.  Assuming flat earth and using some simple trig 
will get you in the ballpark, though.  This is afterall VHF and UHF....

Andy K0SM/2

Baker, Donn B wrote:

>Hmmm, if we use a "rain-scatter" analogy, 270 miles is about the range for a 35-36,000' storm tower.  That is, the top 
>
>  
>
>>-----Original Message-----
>>From: nlrs-bounces at mailman.qth.net
>>[mailto:nlrs-bounces at mailman.qth.net]On Behalf Of jcplatt1 at mmm.com
>>Sent: Monday, August 22, 2005 9:39 AM
>>To: Glen Overby
>>Cc: nlrs at mailman.qth.net
>>Subject: Re: [NLRS] ND Baloon Launch - August 27th
>>
>>
>>
>>
>>Valley City, ND,  appears to be about 1/2 way between 
>>Jamestown and Fargo,
>>ND.   The heart of downtown is EN06xw.    From Bloomington, MN,  the
>>bearing would be 305 degrees at 271 miles.
>>
>>My 2m yagi at 50' has its first peak at 2 degrees and its 
>>first null at 3.9
>>degrees elevation.    Will the balloon rise high enough to be 
>>into my first
>>null ?    On 432 its three times "worse" with the first main 
>>peak at around
>>0.7 degrees and the first null at 1.3 degrees .... again, 
>>will the balloon
>>rise high enough at that distance to get into my first null ?
>>
>>Do they have an expectation as to how high "high" is, what time we may
>>expect to hear it at 271 miles distance (yes, I know there are LOTS of
>>variables, but a prediction would be nice), and for how long ?
>>
>>73, Jon
>>W0ZQ
>>
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