Tips for Mobile Communications on Field Day – Ham Radios for Emergency Communications Reply

For those who have a two-way radio (and have obtained an operators license), the annual Field Day event sponsored by ARRL is the perfect opportunity to test your skills, and to practice setting up your equipment in a mock disaster scenario.

Always held the fourth weekend in June, “ham” radio operators participate in this event by establishing contact with other operators who are transmitting from thousands of other locations around the country.  To find a location near you, visit:  To learn more about Field Day, read the post: Field Day, the Annual Amateur Radio (Ham Radio) Disaster Preparedness Event

1. When setting up antennas within close proximity: If you are using wire antennas such as dipoles, and they run parallel to each other there will be interference on your HF operating bands in the form of hash so arrange them at right angles to each other and at slightly different heights. If you use wire antennas such as dipoles, try to stay away from trap dipoles and use full length antennas instead.  You may also wish to run your dipoles in different configurations such as have one as an “inverted V” and another as a sloper, etc. An antenna cut to the exact band you are using will decrease interference to and from other bands. Do not use compromise, trap or “all band” antennas. (The only efficient “all band antennas” are a log periodic and a “fan dipole” NOT a “folded dipole” or others that claim they use “balancing resistors” as this only wastes RF energy in the form of heat.) With others you may make a few contacts, but they are junk and will cause harmonic radiation. Dedicated operating needs the right antenna. Wasted energy on trap antennas (some of your RF energy is used up in the form of heat) and that equals an inefficient radiator, especially as you go lower in frequency. On HF, do not use vertical antennas as they receive too much man-made noise from sources such as generators, etc.

2. When NOT to use a tuner!  Tuners are great and some people use them all the time. (This includes any rig’s “built in tuner” or any “out board tuner”) HOWEVER, you need to concern yourself with something called “insertion loss”. Every time you use a tuner, there is a power loss due to heat of matching an antenna system to a rig. READ THIS: If the antenna system is measured at an SWR (standing wave ratio) of 1:1.5 or less before using a tuner you do not need to use a tuner to do a perfect match as the insertion loss of using the tuner will be off-set by any matching it does. Power (erp) will be lost in the form of heat within the tuner. If you don’t believe me, do-a-test using a field strength meter at a distance of several wavelengths away from the antenna and you will see that what I’m saying is correct. Tuners do not work miracles, so don’t expect them to.  Using a tuner for NVIS is another story as it is an emergency “compromise antenna”. Using a tuner to compensate for an antenna that is way “out of whack” should tell you to use a better antenna (or FIX it), matched by it’s length, for whatever band you wish to operate. If you use a tuner to match, say a 20 meter signal to work with a 15 meter antenna, it will also create harmonic distortion on the other bands!

3. When operating within a tight area, as required by FD rules, it also pays to use “band pass filters” such as those manufactured by ICE. I have a full set of these HF filters and they work great. They are only about $ 38 per band and drastically reduce interference from your other operating posts. Make sure they are grounded as seen by the grounding lug on the photo. If your pocketbook can’t afford them, use coax “stub” filters. The lengths of these and how to build them can be found at:  They are simple to make and easy to use. Both systems have been used by the major DXpeditions all over the world with great success. On HF frequencies make sure each operating station is properly grounded. Do NOT use a common ground for all your operating posts. If you do, you will get “ground loops” with energy going where you don’t want it, including in to computer logging systems and the possibility of RF burns by operators or anyone touching the equipment.

4. Make sure that each operating position has a laminated chart of frequencies that can be used under your station’s or club’s operating license. Watch out and don’t operate too close to the band edges. ( and remember: no one “owns” a frequency)

5. If using computer logging, always have paper logs and scratch pads ready to use in case your computers bog down or crash. (ever use a “dupe sheet”? Don’t know what it is? Find out!)

6. Whenever  I operate either in contests or operating events, I find it advantageous to camp out (remain on) a frequency rather than tune around (hunt and pounce). Remember that propagation conditions will change so stick with it even if you think the band has died or other stations appear on your frequency that weren’t there earlier. That’s just how propagation works. Save “hunting and pouncing” for near the end of the event.

7. Keep your calling frequency active by calling CQ often. Don’t wait! Leave a gap of onlyseconds between calls or stations tuning by will miss your call and other stations wishing to camp out may take over your frequency. In events such as FD, it also pays to use an automatic voice unit such as MFJ 434B “voice keyer”. (Cost is about $170.) If you can’t obtain one, use a cheap electronic memo reminder and just play back your pre-recorded CQ while holding it close to your microphone. This form of “acoustic coupling” is an inexpensive way to save your voice. I have used both methods over the years with success. Keep your calls “short and sweet” using ITU phonetics ONLY. Don’t use any “cutesy” phonetics.

8. If you are lucky enough to cause a “pile up” (several stations calling you at once) answer the easiest one to hear first. If you can’t make out complete call-signs, ask for the station with the easiest partial call to reply. The others will wait. Do not get flustered. If you do, simply state “QRX”. This will give you a few seconds to re-focus your thoughts. It is at this time where it also pays to have another person with you to help sort out any call signs or help with logging.

9. Ignore jammers. Do NOT bother answering them.

10. Have your station’s call-sign and exchange info posted in large letters at your operating position in case you get a bit tired or flustered so you won’t forget and announce your own call by mistake.

11. If possible, bring your own headphones to make your life easier and to cut down on ambient noise from your area. An “odd ball” pair of headphones can actually put stress on you if they don’t fit properly.

12. Talk in a loud, clear voice. No need to shout as it distorts your signal and makes it splatter to adjacent frequencies. Speak in to the microphone at an angle.

13. Pace yourself, drink plenty of fluids and let whomever is in charge know when you need a break. Do NOT be a “mic hog” as other people may wish to gain the experience of operating. I’m sure there will be plenty of ops around which will allow you the chance to rest a spell.

14. Learn a bit about propagation characteristics for each band and time of day before you come to FD. With sunspots on the raise, the higher bands will be a bit more active than in previous years, unless there is a solar flare or other disturbance.

15. If there are enough people, have someone do the logging for you. This way they will learn to copy call-signs under less than perfect situations and will make life easier for you. A “double set of ears” makes it easier to operate and log. It might even entice non-hams to get their license. If you aren’t operating at the moment, try to keep the “chit-chat” down at any operating post. Save the talk when you are away from whoever is operating as it may confuse them.

16. If you want your FD to be more successful, WAIT until all members have arrived before deciding what amount of stations you wish to put on the air for the event. You can always change bands, even with a 1A station. Years ago one club I was a member of on Long Island decided to operate 20A! That’s 20 stations operating. The only problem was there wasn’t enough people to man all the stations for the length of FD, so we were stuck at times with 10 stations we couldn’t use. You can’t change your exchange once the event starts. Talk about bad planning. Make sure everyone signs a log-in sheet so operator tally can be accounted for.

17. Flag all coax runs, power cords and antenna guy lines with brightly colored caution tape so no one walks into them or trips over them.

18. Never assume you’ve “worked them all”.  In 1991 a pair of inexperienced ops came out of the 40 meter SSB tent claiming they “worked the band dry”. I told them they hadn’t and taking another op to log for me, in 30 minutes I worked an additional 60+ stations on that “dry band” by hunting and pouncing. Lesson learned: There are always other stations out there to work.

19. Know the rig you are operating by reading each radio’s instruction manual. By doing so you’ll avoid problems and make more contacts.  Be especially careful of the filters in complex radios as they could filter out wanted signals. Keep your operations simple so the next person assigned to your station won’t get confused twisting and turning knobs! Have a rig’s “cheat sheet” handy.

20. Turn off all gear during refueling of any gas generators. Use proper safety procedures so voltage spikes won’t harm your radios. This means to turn off your radios BEFORE the generator shuts off and wait until it reaches operational speed before turning your gear back on. You can get voltage spikes during the shutting off of the generator and the start up cycle. Use care when refueling the generator and NEVER gas it up while it is running. A gas spill even when the generator is off but HOT can also spell disaster.

ARRL training in emergency radio operation:

Skywarn resources for emergency radio operation:

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