Comments on: Microwave link engineering with Google Maps

By: steveyoung

steveyoung — Wed, 11 Nov 2009 18:15:29 +0000

In the MLOS tool the limit is 80km because the height data is collected for every 90m and distances over 80km would cause to many requests. In the MLET tool please see the answer to Andy Paddon (#23 above). This tool calculates propagation outages caused by flat fading and this applies mainly to frequencies above 18GHz. For 18GHz a distance of ~20km is possible with an availability of around 99.99% so I wouldn’t use the tool for longer distances. What distances and frequencies were you using?

You *can* anchor one site and move the other around. As stated in the basic instructions “After you have entered your markers you can click on Marker B to make it draggable and then drag it to another location”

The 7GHz is in the MLOS tool to show theFresnel zone. It is not icluded in the MLET tool because multipath (selective fading) calculations are not done.

By: ray

ray — Wed, 11 Nov 2009 13:32:42 +0000

now that I have played with it a bit, code seems to have an error when dealing with long paths. Shows -55.8 rsl at all locations even at impractical distances.

Even if long paths cannot be graphed, would be nice to have edge or terrain blocking notice flag.

Would be nice to anchor one site and move the other around on the map.

7GHz pull down available on one of the two tools- Why?

By: ray

ray — Wed, 11 Nov 2009 12:21:27 +0000

I can see this as a great tool for ENG use. Would love to use this tool with a 2 GHz choice and with longer shots than 80km.

By: steveyoung

steveyoung — Sat, 31 Oct 2009 21:04:00 +0000

No, not unless you want to buy the tool. The tool is copyrighted.

By: mutasem

mutasem — Fri, 30 Oct 2009 17:50:37 +0000

i need to download the micrwave links budget calculator on my pc, would you please help me

By: sandrar

sandrar — Thu, 10 Sep 2009 19:30:46 +0000

Hi! I was surfing and found your blog post… nice! I love your blog. Cheers! Sandra. R.

By: Andy Paddon

Andy Paddon — Wed, 11 Mar 2009 14:48:18 +0000

Steve, thanks for adding the 13 = 15 GHz info.
To answer your question, I probably wouldn’t use the additional services you mention as I’m not involved with link design etc. Im just trying to increase my understanding of microwave links. I will be however be recommending the site to my colleagues.
Thanks again.

By: steveyoung

steveyoung — Sun, 01 Mar 2009 19:29:31 +0000

Ok, I have added 13GHz and 15GHz with a warning. Please be aware that the distance calculated for these distances will be much greater than is really possible because the selective fading has not been included in the calculations.

Please recommend the site to colleagues and please click on interesting ads, this is the only income I get for my efforts.

By the way I am working on a new version of the tool which enables links and radio types to be saved. For several reasons I will have to charge for these additional services, but the existing services would remain free. Just to get a feeling for how many people would be interested in these additional services can I ask you if be prepared to pay for these improvements?

By: Andy Paddon

Andy Paddon — Sun, 01 Mar 2009 15:04:33 +0000

Thanks Steve, that would be great.

By: steveyoung

steveyoung — Sat, 28 Feb 2009 12:18:04 +0000

the problem is that for frequencies between 10-15GHz selective fading (multipath) and flat fading (rain) are both significant. At the moment the tool concentrates on the higher frequencies and performs no multipath calculations. I could include multipath calculations but I am busy at the moment on a new project – making it possible to save links.

I could include the flat fading calculations for 13GHz and 15GHz without multipath and add a warning that multipath hasn’t been considered. Would this be ok?