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Transmitter Hunting T-Hunting is a popular activity among Amateur Radio operators, also known as; transmitter hunting, fox hunting, radio direction finding. A SOARA T-hunt starts with a transmitter on the 2-meter band that is actually hidden somewhere in South Orange County that is "hunted" and located using radio direction finding techniques. The transmitter is usually on the air intermittently, and automatically identifies itself either in Morse code or a tone sequence. Amateurs participating in the SOARA T-hunts can expect low pressure, fun events and we encourage new Hams to participate. This is a good time to ask other Hams for help but they may not tell you ALL their secrets. The T-hunts start at 1300 hrs (1:00 pm) on the first Sunday of the month and usually last 2 to 4 hours. This is a good time to ride with a friend. Snoop around and you should be able to find an experienced SOARA T-hunter to ride with. When the transmitter is on the air, the hunters "take bearings" using directional antennas by determining the direction where the signal is the strongest. This is done throughout the hunt until the transmitter is found. Usually, driving to the immediate area of the hidden transmitter is part of the game. Once there, the remainder of the hunt takes place on foot while you "sniff" out the actual location of the hidden-T. The transmitter transmits on 146.565 MHz and coordination is on the SOARA repeater 447.180 MHz, PL is 131.8. The transmitter may be hidden anywhere that is safe and has public access in Orange County, south of the 55 Freeway. The hunters may start anywhere they choose. To put a rumor to rest, you do not need expensive equipment for transmitter hunting! All you need is a 2-meter receiver (a handheld will do), an attenuator and a directional antenna (yagi, quad, etc.). The “tape measure” antenna is a good choice. Other items that can help, but aren't necessary, are a map of Orange County, a compass, a protractor and some refreshments! Most of the equipment just mentioned can be built for a rather cheap price, and it performs exceptionally. T-hunting is both a fun and a serious activity. The "winner" of a T-hunt is determined by the person who finds the transmitter first. The winner is then the person who hides the transmitter on the next hunt. T-Hunters also use their skills to locate downed airplanes, boaters in distress, and sources of radio interference, unlicensed operators and jammers. T-hunters use competitions like our monthly hunts to test their equipment and practice their skills in preparation for more serious situations. You may want to be included on the T-hunt email list. If so, please contact Richard at k6rbs@soara.org. Please include your callsign in the subject line. Be sure to check out some of these links for T-hunt projects: http://home.att.net/~jleggio/projects/rdf/tape_bm.htm http://www.west.net/~marvin/k0ov.htm http://www.lbara.net/2_meter_4_element_quad.pdf http://www.homingin.com/dualfeed.html http://www.foxhunt.com.au/index.html See you on the next hunt!
********************************************************************* February 2010 Transmitter Hunt - AKA Richard's Revenge
We agreed to start the hunt at the earlier time of 11:00AM and finish at 2:00PM giving everyone plenty of time to find the T and get to Super Bowl parties before the game started. I used phone patch to run the pre-hunt check-in to reduce the possibility of anyone DF-ing me on the repeater input. Tom, AE6SH, Mark, KD6LWY and Gray WA6BJY started the hunt with N6UZS, AD6OI and others lurking on the repeater and providing comments and signal reports. WA6BJY was also joined by Gary, KJ6EUH, who wanted to learn about T hunting first hand. Tom gave up early due to equipment failure.
A few days before the hunt I met another new ham, Mikkel, KJ6EKX on one of the SOARA repeaters. It was no coincidence that I suggested to Mikkel that he listened in during the hunt… the T was literally line of site to his house. Mikkel not only listened in but he joined us at the end of the hunt and was even able to try some hunting for himself thanks to our winner, Mark, who lent him his antenna and sniffer,
Mark showed up around 12:00 and was the first to find the T at 12:10. After a couple more hours of searching every cul-de-sac near the El Toro Road and the 73, Gray finally returned to Hollyleaf for the third time uttering many of the words that make up the FCC infamous list. Congratulations to our winners Mark and Laura who will be hiding the T on March 7th. ********************************************************************* December 6th, 2009 Even though I disqualified myself
from the November T-Hunt, it was decided that I should be the stuckee
with the job of hiding the T in December. It was not my fault that Tom
drove in front me on his way to hide the T in November! And I didn’t
follow him all the way to the T! I spent some time over the past week or so searching Google Earth for a good location. I had narrowed my search down to 4 or 5 sites that I drove to and checked out and any one could have resulted in a challenging hunt. Sunday morning came around and I still hadn’t decided which one to use. My mind was quickly made up when Kris, KR6ISS, commented on the morning 40M net that there should be a rule that the T can’t be hidden in a hole in the ground so that nobody can hear it. I decided to answer this by ‘hiding’ a T in a location that EVERYONE could hear. My only fear was that this meant putting the T on a hilltop – the kind of place that T hunters like to start. I borrowed the new SOARA T that Brian NJ6N has assembled and headed off towards Signal Peak. I had never been there and didn’t realize that N6UZS actually hid a T there a few months ago. I parked at the baseball field on East Coastal Peak and setup my gear. In addition to the SOARA T, I had a 13 element horizontal beam and a brick that was putting our around 50 watts. Giving a total of about 1KW ERP pointed towards Santiago Peak. I just finished setting up (with the beam on a short PVC mast stick into a stake pocket on my truck, when I saw Gray, WA6BJY stop about 200 yards away. Oh ^%$# ! It was too late for me to move locations and there was no way to leave without passing right by him. I decided to go ahead with the hunt anyway and try to confuse him by pointing my beam straight at him and hopefully swamping any attenuator that he was using. I fired up the T at 1:00pm and after a couple of cycles I was delighted to see Gray jump in his truck and head off over the hill. At least for now, I was safe. A few minutes later his truck appeared again and this time he drove right up to me. His time of ~15 minutes must be a new record! Mark, KD6LWY and Laura, K6VIX
showed up after 42 minutes. They said that the reflections were
confusing but they did get a few good bearings that all pointed to
Signal Peak. Richard - K6RBS ********************************************************************* T-Hunt Results for October 4th, 2009 This month’s T-hunt was short and sweet. With only one hunter, it lasted only about thirty five minutes. Tom, AE6SH came in first and last, but not second. This means he will have to hide next month. The “T” was hidden in a tree about head high. I think the ants were first on the scene but they don’t count because they watched me hide it. Unfortunately, my phone died after taking pictures and restoring it deleted the picture of the transmitter box hanging in the tree. The location was off El Road and north of Upper Oso Reservior. Hopefully, there will be more hunters next month Gray WA6BJY *********************************************************************
On Sunday, September 7, what started out as a simple T-hunt turned into
an-other SOARA first but first some back-ground. Timothy McGowen, AF6GL
was assigned to hide the transmitter. The night before he checked the
equip-ment ensured the battery was topped off, a signal was being
transmitted and the call sign was reprogrammed. So far, so good. Tim
left home and on his way to his secret elusive spot he ob-served the
traffic on the freeway was so bad that it would make the hunt far too
unenjoyable, so on the fly the loca-tion was changed and the “T” was
hid-den. ********************************************************************* March 2009 Sunday's transmitter hunt appeared to have
provided a challenge for
Gray WA6BJY ********************************************************************* JANUARY 2009
Next on the scene was Karl, KF6MDF at 1H 28M followed shortly by his other team members - W8RRV and NJ6N. W6ARK drove up at 1H 45M. Since the 1st Sunday in February is Superbowl Sunday we will probably move next month's hunt to the following week or the next month. Stay tuned for details or email k6rbs@soara.org to get on our mailing list. ********************************************************************* OCTOBER 2008 HIDDEN by Richard, N6UZS After the weak signal hunt in September I decided to step it up a
bunch ********************************************************************* MARCH 2008
Brian, NJ6N, who is recovering from a foot
injury came by, but he was not in shape to walk around hunting the
transmitter. About two hours after the first hunter
The next SOARA hunt will be held on Sunday, April 6. Gray Bickford, WA6BJY, the winner of this hunt, will hide it. Thanks to everyone who came out on a beautiful, warm Sunday to participate in the hunt.
***************************************************** A Tale of Two T-Hunts - February 2008 It had been roughly a year since the last SOARA T-Hunt, so we decided at the last board meeting that is was about time to get them started again. The first hunt was scheduled for the first Saturday in February so as not to conflict with Super bowl on the 3rd. After a quick email, web, newsletter and repeater publicity campaign, we were ready to go. One of the emails I sent out was to a list of folks who had been involved with hunting a fake mayday caller who had been operating on marine channel 16 a couple of years ago. I did not notice that the list also included Gordon West, WB6NOA. Gordo replied to the email saying that he would not be able to hunt because he was giving a class that day. However, we were welcome to hide the transmitter at his house so that his students could get a taste of what T-Hunting was all about. This seemed like a great idea at the time... more later. In addition to the T-Hunt, Dave KG6QCI and myself held a quick class at Gilleran Park prior to the hunt. Greg N6REG, Kevin KI6LOQ, Mike NM6X and Chris KI6IUC joined us at the park as did Dale, W8RRV. We hid a couple of transmitters, demonstrated how to use offset attenuators, talked about the techniques that we use to find the transmitters and lent equipment to anyone who needed it.
I took with me Brian NJ6N's transmitter, my Astron 30A switch mode PSU, a 100W Microwave Modules 2M amp and an SWR bridge. With it all hooked up, we were putting about 50 watts into the feeder. At the other end of the feeder were 2 stacked 19 element yagis that were pointing across John Wayne airport towards Santiago Peak (lots of reflections !).
We had a visit from the Newport Beach police helicopter that was beaming LIVE ATV down to the class in Gordo's back yard !
Our remaining hunters all gave up with several complaints that we had made this one far too hard for rookies... I have to agree and I apologize if you had a frustrating afternoon and hope that you got something positive out of it and will hunt again in the future. In an effort to help some of our new hunters get up to speed, we are trying to organize some practice all day hunts in the Mission Viejo Area. The first one was on Saturday February 9th. The T was hidden in the upper parking lot at Mission Viejo High School. It ran from 9:00am to 5:00pm with 1 watt ERP on the usual 146.565 frequency. The T was found by AE6H, W6BGR, WA6BJY and W8RRV.
Congratulations and thanks to everyone who came out and found it. We plan to have a similar practice run on February 23rd. ***************************************************** SOARA T-Hunt December 2006
The transmitter was located under a tree root on the side of Also Creek bed with 3 ele hidden in a tree and point NW along the creek towards the I5 freeway. There were several aspects of the hunt that made it quite difficult.
At 1:49 and heard a shout, looked up and
there was Karl! He was across the creek from my location and seemed
intent on crossing the creek and searching from my side.
I continued to wander up and down
Everyone was chasing reflections and
looking at each other for clues. At one point they climbed to the top of
the hill and started looking over fences into back yards. I think Brian
Brian, Tom and Karl continued to search
the hill-side, looking in
Matt's time was roughly 1 hour, 40 minutes. Brian, NJ6N came in second, Karl, KF6MDF was a close third followed by Tom, AE6SH.
***********************************
SOARA T-Hunt November 2006. I hadn't planned to do this one since my partner KG6QCI was unavailable and I'd already spent way too much time playing with radios this weekend. But as the magic hour of 13:00 approached I decided that since Dale W8RRV and Karl KF6MDF were going to the effort of hiding the 'T' I should at least take a few minutes out of my busy schedule to find it :-) I set off from my home at around 12:50 and got to my starting point at 12:59 just as Dale was announcing that the transmitter was about to be switched on. A quick switch of memory channels on my 857D to "FOX" and there it was - S8 at Capistrano Valley High School.
37 minutes, 13.3 miles, first place.
Reference:
You might want to consult the following comprehensive book on the subject of transmitter hunting:
TRANSMITTER HUNTING, Radio Direction Finding Simplified By Joseph D. Moell, KØOV, and Thomas N. Curlee, WB6UZZ
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