Point your antennas to CM97bp (Jamboree on the Air)

In celebration of Boy Scouts of America’s 100th anniversary, Northern California BSA is having a jamboree, and East Bay hams are putting on a jamboree on the air (JOTA) station to give scouts a chance to get on the air.  The station call sign is WZ6BSA, and it should be accessible via HF, VHF (including IRLP), and satellite (when visible from CM97bp). You can get more information here. I am going to be the HF control operator 9am-1pm PDT tomorrow.

More paper sizes

Someone on the eham.net rating site said, “It would be nice if you could scale up the map to a ‘C’ or ‘D’ size sheet.” I wasn’t sure what to make of this because the map program support about 48 paper sizes (mostly European ISO paper sizes). Well, Wikipedia to the rescue. I’ve added ANSI paper sizes A, B, C, D, and E.  Tabloid is a synonym for ANSI B. If there are other common paper sizes that people would like to use, let me know in a comment here.

An easier way to get an approximate location

I found a website that can convert an IP address into an estimate of the latitude and longitude of the computer. I added a new button to the azimuthal map form that uses a few lines of Javascript to populate the location field. I am hoping this will provide accurate enough estimates for most people’s maps. The location field is the one that troubles people the most.

Radial lines every 5° and other improvements

Tom (K8ERV) pointed out that having radials every 7.5° was not very intuitive, so now the map program generates maps with radials every 5°.  This spacing makes more sense because the outer ring has major hash marks every 10° and minor marks every degree.

Due to feedback from John Faughn and Tom (K8ERV), I modified the server to set the Content-Disposition header to specify a filename. This resolved various problems

How to post a comment

Just like an email account WordPress blogs are subjected to spam in the form of unrelated and unwanted comments from people trying to get a link to their site. These comments are usually written very generally so they look genuine on every site. I’ve rejected them all because they had nothing related to the subject of the post or this blog in general. I would love to receive comments about this site. However, please make sure that your comments clearly pertain to ham radio or the post/page your commenting on. Your specificity will help me separate your comment from spam.

Understanding different forms of locations

The azimuthal map program keeps a log of the parameters submitted and whether the map generation succeeded or not. It does not store or track IP addresses or anything that could link requests to particular users unless you identify yourself in the title. Looking at the logs lets me see how people are using the tool and more importantly how I can improve it.

The location field is the one that seems to trip people up the most, and I have been working quite a bit to expand the range of inputs that will work for the location. For example, you can enter degrees, minutes, & seconds separated by spaces now with a N, S, E, or W to specify the latitude or longitude. You can also use unsigned doubles followed N, S, E, or W instead of using signed values.

Most recently, you can enter city names. For large cities, you may be able to enter just the name. For example, “Chicago”, “Paris”, and “London” resolve to “Chicago, IL”, “Paris, France”, and “London, England”. For smaller US cities, enter the name and the state. For smaller non-US cities, enter the city name and country. This approach only works when the spelling and punctuation match exactly.