If I recall correctly from some experiments a few years ago, there is an
upper limit on the number of points you can profile, but not on their
spacing. I think one of the last changes Dean made in HFTA was to
increase the number somewhat, but there is still an internal limit.
73, Pete N4ZR
The World Contest Station Database, updated daily at www.conteststations.com
The Reverse Beacon Network at http://reversebeacon.net, blog at
reversebeacon.blogspot.com,
spots at telnet.reversebeacon.net, port 7000 and
arcluster.reversebeacon.net, port 7000
On 3/5/2012 6:14 PM, David Gilbert wrote:
> HFTA will, as far as I know, work with almost any distance you choose.
> There seems to be a tacit belief that terrain points out beyond 5,000 or
> 6,000 meters are not worth bothering with, but I believe that to be an
> erroneous assumption. It all depends upon the particular terrain
> involved. I live on the hillside of a mountain range with a long
> eastward slope that starts out at about 16% for several hundred yards
> and is still sloping downward at 3% to 4% seven miles away. When I
> compiled my .pro file for Europe I made two versions ... one that
> stopped at about ten miles and one that continued on for fifteen miles
> to catch the next mountain range in that direction. I can easily see
> the difference when comparing the HFTA plots for the two files.
>
> Now then, is all of that valid? Maybe not entirely, , but at least it
> shows that HFTA doesn't stop at 6,000 meters and also that for very low
> takeoff angles even far distant terrain features can still have an
> effect. According to HFTA the peak of my main lobe to Europe and Africa
> is at 4 degrees elevation on 40m , and on 20m it is at 2 degrees, so not
> everybody is likely to have the same situation that I do ... but if in
> doubt add a few more data points further out and see for yourself.
>
> 73,
> Dave AB7E
>
>
>
> On 3/5/2012 1:32 PM, Dick Green WC1M wrote:
>> This sounds terrific, Jim, and will be a huge boon to the amateur radio
>> community.
>>
>> One question: are you proposing to generate .pro files with data out to the
>> full 50-60 miles, or just what HFTA can deal with (5000 meters, I think)?
>>
>> 73, Dick WC1M
>>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
>
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|