Category Archives: Ham Radio

Radiosport.. what's that?

Find something that a person enjoys and they can turn it into a sport. These days we even consider card games as a sport, one that others can watch on TV even.. There are niche sports for just about everything. One of my coworkers here is in to locksport (competitions involving lockpicking). Who would have thought?

The sport that I am into is one that few have heard of… radiosport. It is an amateur radio activity whose base concept is pretty simple: make as many contacts as you can on a set of frequencies within a given set of time. Give it a scoring structure and compete. Within the amateur radio community it is commonly known as “contesting”.

There are many different contests with different rules in play and usually you can find some kind of contest every weekend of the year. However, there are about half a dozen through the year that are active enough where I'd want to take time away from the family and participate.

To give an example, a contest may run for a set period of 12 hours, where everyone starts and stops at the same time. Any contacts made outside of this set time do not count for points. Each contact is a point on your score, and each new geographical area (state, country) is a multiplier to your score. Some contests are geared towards working domestic states and provinces, while some contests are dedicated to only working countries outside of the US and Canada. Let's say in a domestic contest I make 100 contacts in 35 different states. My total score would be 3500. Since contacts benefit points for both ends of the exchange, it is in everyone's best interest to make them, so they are quick, brief, and made to count. When you hear someone on the air from a state that you haven't contacted yet it becomes urgent to contact that station so you get an extra multiplier. You get the hint.

Contesters compete against other contesters, against friends, as well as against themselves (beating previous year scores). In larger contests, you can work in a team where multiple people work on different frequencies at the same time, making different contacts simultaneously. Software is written that works across a network of logging computers to keep track of your logs together, prevent duplicate contacts, and give you a running tally of your score and any “unique” areas that may help your multiplier score. Some would say that “its kind of a big deal”.

The contests can be dedicated to certain frequencies and vary across the whole spectrum of radio capabilities, but for most contests they operate on HF (High Frequency) radio signals. HF signals propagate in the atmosphere and through the ground, allowing them to travel short distances or around the world. But there is a catch: propagation is a very dynamic beast. Some frequencies work well in the day time when the atmosphere is ionized by the sun's rays, while some frequencies work better at night when that ionization is absent. Sun spots and flares can change the game drastically, for better or for worse. We haven't seen much of that this past year in the solar minimum we are in but hopefully that will change in the coming year and the Sun will become a bit more active. There is a bit of skill involved in getting radio waves to and from a given point. In the last contest I worked (an international contest), we capitalized on the change from day to night to send our signals along the “grayline”. The grayline is that line between night and day, and can sometimes carry radio signals along with it from point A to B better than aiming a straight line from those 2 points. In this instance, we used the grayline to pick up a whole handful of contacts from Japan while the sun was just rising for them. Below is what this line looks like on a map.

You have varying station capabilities as well. Radios can run at different power, you can add signal amplification, and different types of antennas will propagate in different ways. No 2 stations that contact each other are going to have the exact same setup. Some antennas are omnidirectional while some can be aimed in a direction (see the image above of the antenna we have at the Indiana University club). My home antennas are made from some wire I picked up at Lowes, while other stations spend hundreds on an antenna. These all play a part in your capabilities, and give you something to improve on over time. Think of it as an athlete building on his game through practice.

I hope I've given you an idea that there is a bit of skill and experience involved in such a “sport”. It is not just picking up a radio and talking. If you want a high score you have to know your stuff and build a well operating radio station. Some people build entire antenna farms devoted to operating in these contests, spending tens of thousands and pulling in a dozen team members to run a contest. Personally, I like to operate contests at home to see how well I've made my antennas, and I like to operate contests from the IU club (K9IU) for the strong capabilities of that station and the teamwork involved. There is always the thrill of the hunt when a contest comes around. How active will the airwaves be? Will the sun help us out or hinder us? It is a lot like sport fishing, and everyone is out there fishing for each other.

Interested? Find an amateur radio club near you via this link, or drop me a line. One of the most popular contest-like activities is Field Day, where contacts are made from temporary stations built outdoors all across the country (see pic above, one of the many stations we had set up in Karst Farm Park here in Bloomington). This happens the fourth full weekend in July, and most clubs welcome visitors to this event to see how things run. Visit this link for more info on Field Day, or check out the photo gallery from our participation in field day last year. I'll post some more links below.

(and no.. morse code is NOT required)

Cheers,
-Corey (KB9JHU)

http://www.radio-sport.net/ ham radio contest news

http://www.indiana.edu/~k9iu/?q=node/10 K9IU – Indiana University amateur radio club contest scores

http://www.hornucopia.com/contestcal/ Upcoming contest calendar

http://www.chrisellerphotography.com/ Chris Eller took the first picture in this post of the K9IU HF and 2m antennas.

Amateur Radio Field Day

Times are changing for Amateur Radio.. Easy in-town radio communications have been leapfrogged by cell phones. Data communications and message passing over the air has been leapfrogged by the Internet.

…but there is still a lot of life left in the hobby.

Field day is this weekend. It is a weekend event where amateur radio operators all over the world get together in the outdoors (“field”) and set up a temporary operating station, typically on temporary power (generator, batteries, etc). This helps to test and gain experience for emergency scenarios, but it also gives the general public a chance to come see first hand what can be done with amateur radio today. All kinds of operating modes are used and demonstrated (voice, data, satellites, etc..) Its a lot more than morse code.

You can find a Field Day location near you by visiting this url.

Came across this homemade promo video for Field Day (reposted from Calling CQ blog). Its a bit cheesy but overall I'm impressed:

For those of you in Bloomington: we will be operating from Karst Farm Park from about 14:00 saturday to 14:00 sunday. See the K9IU page for more details.

Recent ham radio projects..

I'm trying to avoid blogging about the flooding here in Indiana.. It sends me into an emotional fog after seeing firsthand people's houses, just miles from my house, flooded up to the rooftops. I can tell you that there are a lot of heros in our area. You can be one too by helping out with donations to the Red Cross of Indiana.

Automatic backup power

We lose power quite a bit, and when bad weather comes I need it more than ever for radio gear. I have a 13.8v power supply and a 12v battery for backup power. I wanted a simple circuit that would automatically fail over to the backup power if the primary power supply goes out. So here is what I came up with, a simple OR gate built with a couple of diodes:

From Ham Radio

Here I have 2 40v 35amp schottky diodes mounted on a heat sink. The ground (black) from each power source is tied together with the ground out, and the positive (red) from each power supply goes to one of the two diodes. The output of the diodes is tied together to make the positive on the output line. Currently this does not handle charging, but I can leave a smart charger on the battery as long as the charging voltage does not get near 13.8v (the higher voltage will always be the one to draw from in this circuit). I believe there should be a way to charge the battery from the permanent power supply, I'm thinking a resistor and a reversed diode into the positive side of the battery, but I'm not quite sure if that will work right. For now this fits my needs just fine.

The APRS Portadigi

We use APRS in a lot of events here in the Monroe county area. Given the terrain there are a lot of difficult places to transmit from (most of the trackers being low powered) so this box is put together to temporarily place in a dead spot and act as a fill-in digipeater. The box was already used as such a project before I bought it at Dayton. I've got some more work to do on it, and the antenna in the picture is not one that I plan to use permanently (I'll be using a 2m collinear).

From Ham Radio

This is from the first real field test of the “portadigi” outside of my house. It digipeated my packets from a .5w tracker transmission I had as I mowed the grass (yeah, laugh it up). I don't have a good idea of battery life yet since it performed for 16 hours without failing during the first test (with the radio putting out 50watts). I will be taking it to our local field day operations in a few weeks and we will see if it lasts the entire weekend.

I imagine that this could have been useful in SAR efforts last weekend during the initial flooding. However, there needs to be a lot of education and experience in APRS in this area before it can be feasible. We've passed the point in time where amateur radio is useful in providing voice communications during localized emergencies, now let's move towards providing a “situational awareness” with APRS.

Cheers!

25 Skywarn Dos and Don'ts

Severe weather season is upon us. As much as I appreciate Skywarn and love to help out when and where I can, there are just some aspects that really grind my gears. Most of these pet peeves are a result of people getting so excited about the situation that they forget everything they have heard in training (and sometimes what they just heard from Net Control a few seconds prior). We've had some pretty embarrassing Skywarn nets lately so I thought I'd put together a few pointers. For my ham radio readers out there, feel free to add in the comments below.

For my non-ham readers, here is the short version of what I am talking about (and see this wikipedia article on Skywarn): Skywarn is an organization of amateur radio operators who become the eyes of the National Weather Service when severe weather strikes, and by severe weather I'm talking severe thunderstorm and tornado warnings. Today's radar technology is good (really good in this last decade) but the guys staring into a radar screen can not see the real damage and effects of the storm they are watching. So, a Skywarn “net” (another term for an organized meeting on the air) goes active and one person acts as net control, his job being to control traffic on the air. Nobody speaks without permission from the net control. In the case of here in Indiana, our net has a liason person with the capabilities to talk to NWS in Indianapolis on a different radio. His job is to keep track of reports and quickly relay them, then quickly relay direct requests from NWS as well.

The following come from my 15 years of participating in Skywarn nets. Use this as a reference before you hit your microphone :P

  • Do: report tornadoes, cloud rotation, funnel clouds (different from tornadoes), visible wall clouds, and visible shelf clouds.. Learn the difference between all of those (pdf) ahead of time so you don't have to be instructed over the air in order to make an accurate report
  • Do: report hail. Use the NWS guide to hail sizes if you can not measure the hail. Don't use obscure references that might not be so obvious (I've seen big malt balls and small malt balls, malt balls should not be used to describe the size of hail!!).
  • Do: report heavy winds 50mph and above. Know techniques for measuring these accurately, and when making the report tell if it was estimated or measured with instrumentation.
  • Do: give accurate location reports that can be found on a map near a major crossroad intersection. “half mile southeast of hwy 3 and hwy 10″ helps NWS more than “my house on sunset boulevard”. Got a GPS? Give coordinates, but do so quickly.
  • Do: give an accurate time report. “Real time” versus a given time in the recent past is often used. I like to report with the exact time even if it is right this minute, because unfortunately the net control and liason might not get your report to NWS for 10-20 minutes so “real time” loses its meaning.
  • Do: watch radar if you are able to (TV, internet, etc) so you have an idea of what is going on outside without having to interrupt the net to ask someone
  • Do: learn how to read those radar images so you don't make yourself sound like a fool by misinterpreting them on the air.
  • Don't: tell everyone what your radar image is showing unsolicited. Half of us are watching it too, and if Net Control needs to know what radar is showing he will ask for it. In fact, unless of power or network outages, Net Control should have a radar image to look at himself/herself.
  • Don't: tell everyone what your fancy subscription based weather program tells you either. We don't care to hear about 4 lightning strikes a minute outside when we can all see it out the window. Besides, it is not information that NWS doesn't already know.
  • Don't: play meteorologist with Net Control unless your opinion is asked for, or unless you are a meteorologist. If it is the latter case, maybe you should be at work?
  • Don't: report the position of the TV trucks during an active net. Chances are they are heading to the damage we already know about, and we can all expect to see it on the news without the need for your report.
  • Don't: tell us when the wind starts blowing at your house. Its going to blow for everyone, and if the trees aren't falling over yet then your wind is not so exciting. Put the mic down.
  • Don't: tell us that it started raining at your house either. If the weather is bad enough to activate a Skywarn net, then it will rain and it should be of no surprise to anyone.
  • Don't: tell us the rate of rain. Modern dopplar radar does a good job of showing the rate and quantity of rain falling, and they issue flash flood warnings based on that. Save your rain gauge reports for the morning after.
  • Don't: hold another net on the same frequency and during a Skywarn net. It causes people to double up on the repeater and adds traffic that prevents timely reports. Either take your net to another frequency or wait until after, however you do it please yield to the Skywarn net. This includes wetnet reports, just hold on to your report and wait.
  • Don't: try to pass non-weather and emergency traffic during a Skywarn net. If you pulled over to help a stranded motorist, help them by taking cover until the storm is over, and then call for the tow truck. If you must do something right that minute, take it to a different frequency.
  • Don't: check in when Net Control has requested no more check-ins. This makes you look really stupid, especially when you check in right after he makes such a statement (happened twice last week!). The best Skywarn spotters are the silent ones who know when it is necessary to speak up.
  • Do: make significant damage reports. Trees blown over, structural damage, roofs blown off. These are all good. Limbs and twigs in your front yard are nothing special.
  • Do: get the diameter measurement of trees blown over, and report whether it was a live or dead tree. NWS can get a good estimate of the wind speed based on this report.
  • Don't: tell us when the power went out. Chances are half of the people listening have already lost it to. Hearing that your power went out is really of no use to NWS. There is a reason it is called Skywarn and not Powerwarn.
  • Don't: tell us when the rain has reached your house. Everyone is going to get wet anyway.
  • Don't: simulcast the Skywarn traffic to a third party outlet (like a radio or TV station). If they want to listen to the traffic on a scanner that is their choice. If you call soliciting that information, you are out of line and become a possible liability. Go re-read part 97, sub e, section 403 but don't stop reading before the end of the sentence saying “when normal communication systems are not available.” If you are calling a radio station to have them put you on the air, then communication systems are normal enough for you not to make that call in the first place.
  • Do: make your transmissions QUICK and BRIEF. I can't tell you how many times I've heard a station calling in to check in, run outside to look at the clouds, and hold the repeater up for a long time all without making it in to the repeater well enough for us to understand him. Meanwhile, another spotter with something important to say has to wait to break in. “This is KB9JHU, reporting nickel sized hail at 10th street and the bypass” takes less than 10 seconds, yet some people can drag it on to a minute. This includes net control operators. Quick and brief, please.
  • Do: yield your position to someone with more experience if you jump in to start a net or Liason.
  • Do: report on what the net control asks for. If the net control operator asks for stuff in the “Don'ts” above, then he (or NWS) obviously needs it for a reason.

Here is what happens: You learn how to use a radio, how to talk on it, but few people ever learn how to shut up when it is most important to be quiet. Skywarn is not your chance to become a hero, it is just an organization to help spot severe weather for NWS. If we all follow some simple rules and protocol, maybe that goal can be accomplished.

Other resources:
Wikipedia:Skywarn
Skywarn home page
Online spotter training from Indianapolis NWS
Central Indiana Skywarn
Spotter info page from IND NWS

73 de KB9JHU

Return to the Dayton Hamvention

I went to the Dayton Hamvention this year, first time in about a decade (I was a regular attendee back in the 90s).

I won't say much here because I've already said a lot in agreement with what K9ZW has said about the sad state of the Hamvention in his blog post, Dayton Hamvention 2008 Follow-Up Report No. 21 – Dayton the Unwashed.

Basically, as grateful as we are to the DARA for organizing the event, its just not as good as it use to be (or could be). Some claim that it parallels the state and future of ham radio itself. But at any rate, read the K9ZW post and the ongoing comment thread, despite what your opinion of the situation is, there are good points made.