Hi Tom,

Looks like I had entered the wrong coordinates.  Thanks for running the path model.

I have been working with Ed Morin (WB7UBD). He got me straightened out. The modeling tool I was using was poor substitute to Radio Mobile Online.  I created an account and since then have been getting consistent results.

Yes, I know the trees will be an issue.  My QTH is heavily forested. I do not have a tower, so will just have to see what results I get...

Thanks for your help!

Jim
W7ABD
On 08/21/17 23:20, Tom Hayward wrote
Actually, the model looks good to me:
Inline image 2
This is with Radio Mobile. The link is only 17.57km, so I'm not sure why you get a reported obstruction at 19.41km. One of us must be punching the coordinates in wrong.

On Google Earth the trees look pretty tall. Trees are pretty good attenuators at 5.9 GHz, so you'll need clear line of sight for it to work.

Tom

On Sun, Aug 20, 2017 at 12:38 PM, W7ABD <w7abd1@gmail.com> wrote:
Hi Tom,

I used the Scadacore RF Line of Sight path modeling
(http://www.scadacore.com/field-tools/rf-path/rf-line-of-sight/)
This app has to be run on device that has google earth app installed, like an iPad.

Using these parameters:

Haystack    Lat:     47.808024
            Lot:    -121.727227
            Height:  3 m

My QTH      Lat:     47.722862
            Lot:    -121.925666
            Height:  10 m



From the looks of the plot, I have obstructed line of sight at 19.41 km.  So unlikely Haystack will work.  Will check out the other sites...

Jim
W7ABD
On 08/19/17 14:04, Tom Hayward wrote:
The antennas are about ten feet above ground. They're mounted to the building, no tower. 

Tom KD7LXL 

On Aug 19, 2017 1:12 PM, "W7ABD" <w7abd1@gmail.com> wrote:
Thanks for the info Tom!

I completely missed the lat/lot at the top of the pictures page...

Do you know the MSL (height of the haystack antenna).  Seems I have missed that too...

Will be happy to share my method for path modeling once I get it up and running...

Thanks!

Jim
W7ABD
w7abd1@gmail.com
On 08/19/17 08:15, Tom Hayward wrote:
You can find the location published here:

The antenna pattern is here:

Haystack has two of these, aimed at 0 and 240 degrees. 

There is 500mw of transmit power at the antennas. The receiver threshold is about -90dBm, but -70 is required for full speed. 

I'm always curious to hear about path modeling, if you want to share your methodology. 

Tom KD7LXL 

On Aug 19, 2017 8:05 AM, "W7ABD" <w7abd1@gmail.com> wrote:
I considering joining HAMWAN, but before I invest in the equipment want to make sure I will have good signal and bandwidth at my home QTH.

Can someone please send me the exact location (lat, lon) of Haystack, so I can do a line-of-sight study.

Thanks!

Jim
W7ABD
w7and1@gmail.com

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