Archive for February 2009

DX Spots on NMHams.com and beyond

If you’ve perused the left navigation column at NMHams.com, you’ve probably discovered our all new DX Spot application. It’s an RSS grabber that propagates the #DX search over at Twitter.com. If you haven’t visited Twitter yet, check it out! It’s been described as the “heartbeat of the Internet”, a 140 character world of comments and information, a microblog environment where you can share what’s on your mind and follow what’s on others.

Digging a bit deeper into how the DX spots get to Twitter, and to us.. Many come via DXSummit, through the VE3SUN DX Monitor software, which has a hook to spit spots to Twitter.

There’s also a tantalizing Twitter account, W5UGD, through which John Hoyt fires spots from the #marac dx spot interface over at irc.superhosts.net. Notice the “irc” at the head of that last Internet address? That stands for Internet Relay Chat, the granddaddy of all Internet communication mechanisms. Not as many folks use IRC these days, but it’s still a robust and customizable system that hams sometimes use to augment emergency communications.

And we can’t forget Telnet. Telnet is another of the early Internet applications from the days when plain text ruled the web. Just about every computer operating system has a terminal program built in. You can use it to Telnet into DX Clusters that send DX spots as they are reported. It’s textual so you have to learn the language of telnet to control how you get your DX feed, but it’s possible to customize what you see to meet your specific tastes. You can also send your own spots via Telnet, too.

If you want a full featured GUI DX application, there are a ton of choices out there for whatever operating system you prefer from Linux, to Windows, even for the IPhone.

But, whether you Telnet, tweet or have your own application, with our special DX cluster monitor here at NMHams.com, you’ve got the latest spots whenever you visit.

Scott Westerman – W9WSW – is the New Mexico Technical Coordinator for the American Radio Relay League.

What’s it sound like?

I’m a digital freak. I still have my packet rig percolating away on 145.01 and I love scanning the waterfall on the low bands for interesting digital signals. Recently I downloaded Ham Radio Deluxe, the free, very cool radio control software trail bossed by Simon Brown HB9DRV. One of the programs included is DM780, a robust digital signal reader that can decode 35 different formats.
I love digi because you can copy it down in the mud. It can be particularly useful to get important traffic through even when the band’s aren’t cooperative.

But you still need your ears to discern what format is being transmitted, so you can set your software to decode it. Here’s a site that can help you develop that skill. It has MP3 snippets of 20 plus digital formats. You can set your mixer to the Wave setting and read the data stream on your digi software, too.

Several hams have put examples of digital signals on YouTube. Not only is it a good way to develop your ears, but you can also see what programs and equipment they use to receive and read it. Plug PSK31 or FeldHell into the search box and see what you get.

If your ears are still deceiving you, you can check out this site, which has pictures of various digital wave forms as seen on the waterfall display.