Skadi — First Avalanche Rescue Transceiver “Beacon”

Post by blogger | August 9, 2013      
Skadi opened up, lid is upside down at bottom of photo.

Skadi opened up, lid is upside down at bottom of photo. Transmit for a week, receive for a month -- a bit different than these days. Showing charger plug, earphone, etc., penny for scale. The unit is about 7 3/4 inches long, serial number 4252 is hand engraved on the inside plastic. It was originally owned by an Aspen Mountain ski patrolman. 14.5 ounces, 412 grams. Was usually carried with the lid duct taped or rubber banded, in a large coat pocket or fanny pack. Click images to enlarge.

The first effective electronic avalanche rescue beacon (radio transceiver), called the Skadi, was created in 1968 by a research team headed by John Lawton at Cornell Aeronautical Laboratory in Buffalo, New York. Before then, at least one American, an Englishman and various Europeans had developed electromagnetic methods to locate avalanche victims, but their experiments and products lacked enough range and accuracy for the fast location needed to save lives.

Skadi had a long lasting battery and approximately 90 foot range — it could truly save your hide. The first production units were sold in the early 1970s (most likely 1971), and the Skadi quickly became a standard item for workers at risk of snow avalanche burial, such as ski patrollers.

Skadi unit was known as the 'Hot Dog' for obvious reasons.

Skadi unit was known as the 'Hot Dog' for obvious reasons. The lettering was originally a sold yellow gold color. This lettering was penned in after original was worn off and otherwise obscured by hardened duct tape adhesive that was chemically removed.

As with many modern inventions, Lawton’s device was a culmination of ideas and experimentation involving many people. In particular, well known avalanche expert Ed Lachapelle (1926-2007) had an influence. In the late 1960s LaChapelle was working at Alta, Utah and involved in the development of modern avalanche safety ideas and techniques, including methods of finding buried avalanche victims. In his words:

“I was experimenting with a search technique for avalanche victims and had built a small, pocket-size radio transceiver working at upper end of broadcast band. The idea was to pick it up with a portable radio receiver, using the receiver’s loopstick antenna for some directivity. John Lawton happened to be skiing at Alta and saw me doing the experiments. John said “I think there is a better way to do this.” He went home and assembled an experimental pair of units using an audio frequency induction field and sent them to me to test. They consisted of a pocket transmitter about the size of a cigarette package and a plug-in antenna in the form of a wire coil about a foot in diameter to be sewn into the back of a parka. They worked! In fact the large coil antenna gave more range than the ultimate marketed Skadi, but obviously was awkward to use and limited the user to the chosen parka.”

Lawton downsized the unit, mostly by eliminating the parka antenna and replacing it with a smaller antenna that could be built into a handheld plastic box. Just as today’s avalanche beacons function, the original Skadi radiated a magnetic field by pulsing electricity through a copper coil, with reception done by picking up the magnetic field and producing sound in a small earphone.

Volume control. Finding a victim was done excusively by bracketing based on volume level; you'd turn down the level so you could more easily discern changes in level as you searched.

Volume control. Finding a victim was done excusively by bracketing based on volume level; you'd turn down the level so you could more easily discern changes in level as you searched. The concept of 100% audio searching, with an earphone, had advantages such as simplicity. But an external corded earphone was most certainly a fiddly component.

The original production unit was enclosed by an elongated plastic box, about 7 3/4″ long x 1 3/4″ high x 1 1/4″ wide. Due to the red color of the box, and its curved corners, users (most often ski patrollers) nicknamed it the “hot dog,” or “hot dog Skadi.” The first production units were sold in the early 1970s (most likely 1971), and the Skadi quickly became a standard item for workers at risk of snow avalanche burial.

One can only assume that the Cornell team put much time and effort into the method of finding a buried unit by receiving the transmitted signal (as building a transmitter is a simple exercise.) Their elegant and simple method, which found its way into virtually all later beepers, was to give the user an audio signal and a volume control — nothing more. For the radio/audio signal they chose a frequency of 2.275 kHz, which is audible to the human ear. By doing this, they eliminated much of the expense and complexity of a radio transceiver that has to convert a non-audible signal to a tone you can hear. What’s more, while higher frequencies such as the current standard of 457 kHz have advantages, the frequency Lawton chose was virtually free of interference, and worked well when blocked by objects such as rocks and trees. (Due to various political issues, and greater range, the higher frequency became the international standard in 1996.)

The signal was louder when units were closer together, so by using a grid search pattern a searcher could home in on a buried victim by listening for volume changes.

As the human ear is more sensitive to such changes at lower levels, the volume control was constantly turned down as the signal got louder, thus allowing precise location of the source.

In the field, provided the operator got lots of practice, the early Skadis worked surprisingly well, though the fact remains that about 50% of avalanche victims die because of trauma rather than suffocation, thus rendering the device useful only with half of burial victims.

Skadi selector switch and battery.

Skadi selector switch and Nicad D-cell battery. The units were obviously hand built, mostly off-the-shelf electronics parts.

Per its use as an institutional tool, the original Skadi had a built-in rechargeable NiCad C-cell and charging circuit. Transmit was rated as 1 week, receive as 1 month. In practice, Skadis were often left plugged in every night. A small toggle selector switch near the battery changed modes between charge/off, receive, and transmit.

The Skadi worked. It saved lives and was soon copied and improved by European manufacturers, who changed to a more elegant form-factor built around replaceable AA batteries rather than built-in rechargeables. Today’s amazingly featured digital avalanche beacons incorporate microprocessors to simplify searching, and have more features, but all work on similar principles to the original Skadi. Hats off to John Lawton and his team.

The word Skadi comes from the old Norse word Skaði, variant Skade. This female is often referred to as the goddess of skis, she traveled on skis, carried a bow, and hunted. She was the daughter of the giant Thiazi, and married Ullr, the god of skis.

Early attempts to make avalanche victim locator devices included the SKILOK, invented in England, with a range of about 25 feet.

Date of invention: The 1968 date for Lawton’s invention is the common wisdom, but needs to be verified. It refers to the date the Cornell team “invented” the SKADI, not to the date it was first sold to the public. Northwest ski historian Lowell Skoog graciously provided me with a page copy from Summit Magazine, March 1971, which displays an announcement for “Avalanche Search Device — A lightweight transmitter-receiver small enough to carry in your pocket has been developed as a safety device for those traveling in avalanche terrain…units are called “Skadi” and are available from Lawtronics…Buffalo, N.Y.”

Skadi label in original backcountry skiing avalanche beacon.

This label was pasted over the address under the cover when the corporation changed its contact information. The logo is classic and speaks backcountry skiing.

Who invented it? As with many inventions, various individuals may have been considering similar concepts to the Skadi when it was being invented. In particular, Lowell Skoog told me that avalanche expert Ed LaChapelle may have been considering a similar device during his days in Alta in the 1960s. I subsequently contacted LaChapelle, who provided me with the information about his involvement (see text of LaChapelle letter below).

NiCad battery memory effect: If not completely drained before charging, early NiCad batteries would sometimes not take a maximum charge. If such batteries were used day after day, and charged every day without completely discharging, this effect could result in a nearly ineffective battery with virtually unknown capacity. Nonetheless, according to LaChapelle, the NiCad was chosen for its better performance while cold compared to alkaline batteries.

Relevant text from Ed LaChapelle letters:

“Dear Lou, Here’s the Skadi history in brief. I can’t remember the year, perhaps your research will turn it up. I was experimenting with a search technique for avalanche victims and had built a small, pocket-size radio transmitter working at upper end of broadcast band. The idea was to pick it up with a portable radio receiver, using the receiver’s loopstick antenna for some directivity. John Lawton happened to be skiing at Alta and saw me doing the experiments. John said “I think there is a better way to do this.”. He went home and assembled an experimental pair of units using an audio frequency induction field and sent them to me to test. They consisted of a pocket transmitter about the size of a cigarette package and a plug-in antenna in the form of a wire coil about a foot in diameter to be sewn into the back of a parka. They worked! In fact the large coil antenna gave more range than the ultimate marketed Skadi, but obviously was awkward to use and limited the user to the chosen parka. With this start, John came up with the initial “hot dog” Skadi, using a ferrite loopstick inside the unit. To get an effective antenna he used a long loopstick, hence the elongated shape which gave the unit a hot dog appearance. The final, more blocky shape used a shorter loopstick with more efficient electronics.”

“The choice of an audio frequency induction field was a good one. The Skadi was practically impervious to outside interference and could locate buried units under rock or dirt as well as snow. The higher frequency units, mainly originated in Switzerland, had advantages of lower power consumption and improved search performance. This led to the dual frequency units and eventually to a radio frequency (just below the broadcast band) as the international standard.

“A technical clarification: the Skadi in transmit mode generated an audio frequency induction field at 2275 Hz (that’s where the crystal control comes in), not just a broadband pulsed copper coil. Such a field falls off with the cube of the distance from the transmitter, which makes it more sensitive for searching in contrast to a radio frequency transmission which falls off with the square of the distance from the transmitter. (I got this explanation from John.)”

“Best regards, Ed LaChapelle”

In 2013 Skadi inventor John Lawton contacted this writer, a few excerpts from correspondence with John:

I conceived and developed SKADI while employed as an electrical engineer/pilot by Cornell Aeronautical Laboratory, CAL, in Buffalo, NY. At that time I was also a volunteer ski patroller at the Glenwood Acres Ski Area, now a part of the Kissing Bridge Ski Area, located approx. 30 mile south of Buffalo in Colden NY. To the best of my knowledge there never was a snow avalanche at Glenwood Acres. (There may have been people avalanches). Nevertheless we practiced avalanche rescue in the sand dunes on the Canadian side of Lake Erie. We used electrical conduit for probe poles. It was suggested that the number of false alarms, due to the probe hitting an object other than a buried body, could be reduced by cutting teeth into the ends of the probes and turning the probe to see what the teeth would bring up, e.g. wood bark, threads, blood etc.

I said to myself there has to be a better way and that led to the development of SKADI. I discussed the issue with Ditmar Bock, one of my coworkers at CAL and we conceived SKADI and CAL patented it. (In accordance with our employment contracts we were both listed as the inventors but the commercial rights of the patent belonged to CAL.) I formed a company, called it Lawtronics, Inc and started to make SKADIs in the basement of my home and testing them locally and also in CO and UT. I met Ed LaChapelle, Monty Atwater, Bings Sandal and Ron Perla at Alta and remember talking with them about the SKADIs.

At that time almost all of CAL’s work was sponsored by the defense department but there was interest in development of commercial products. It was suggested that SKADIs could be used to locate firefighters who became disabled at a fire. CAL bought a few of the SKADIs which I had built in my basement and also assisted me in demonstrating them at various ski areas. The Swiss army got interested in SKADIs and bought several SKADIs from Lawtronics.

The town of Lockport, NY is located on top of the Niagara Falls escarpment. There are numerous caves under the Lockport and these caves are part of the town’s sewer system. At that time the town was interested in mapping these caves and had used spelunkers to explore and survey the caves. This proved to be a difficult job and I suggested that if they gave a SKADI to one of the spelunkers I could trace his path above ground. This idea turned out to be very practical and in an hour or so we traced out what they had been working on for months.

There was an international competition at the SLF, Institut fuer Schnee and Lawinen Forschung (Institute for Snow and Avalanche Research) of the ETH, Eidgenossiche Technische Hochschule (Federal Technical University) at the Weissfluhjoch near Davos Switzerland of technical means for avalanche rescue. I vaguely remember that there was a British system called Ski Lock, a Yugoslav system called Lawinenspecht (Avalanche woodpecker) and SKADI. Anyway, SKADI turned in the best performance.

The first save by means of SKADI and as far as I know, by any avalanche rescue beacon, occurred on Jan. 10, 1972 at 11:00 A.M. At CMH (Canadian Mountain Holidays) the victim was Roy Fisher.

John Lawton



27 Responses to “Skadi — First Avalanche Rescue Transceiver “Beacon””

  1. John Glor August 9th, 2013 8:38 am

    It is surprising that they integrated the 120v plug and transformer into the unit instead of using whatever 6/9/12v plugs and chargers.

  2. Jack August 9th, 2013 8:55 am

    Holey Moley, that is definitely electronics from the 60’s! The audio range RF signal totally makes sense. As an electrical engineer this strikes me as a beautifully simple design. Thanks Lou!.

  3. Lou Dawson August 9th, 2013 8:57 am

    Gloor, I didn’t think about that but you’re right, kind of strange they didn’t have an external charger. Then, on the other hand, I frankly don’t remember if “wall warts” were that common in 1970! I do recall that even Nicad batteries were cutting edge (grin)!

  4. Doug Driskell August 9th, 2013 9:39 am

    Hmmm . . .

    Looks just like my old Skadi

  5. Lou Dawson August 9th, 2013 9:45 am

    In case anyone is wonder as to the origin of the name “Skadi.”

    “The goddess for whom Scandinavia was named dwelled high in the snow-covered mountains; her favorite occupations were skiing and snowshoeing… But when the gods caused the death of her father, Skadi armed herself and traveled to their home at Asgard, intent on vengeance. …She was more than a match for the gods… they were forced to make peace with her.

    Skadi demanded two things from the gods: that they make her laugh and that she be allowed to choose a mate from among them. The first condition was accomplished by the trickster Loki, who tied his testicles to the beard of a billy goat. It was a contest of screeching, until the rope snapped and Loki landed, screaming with pain, on Skadi’s knee. She laughed.

    Next, all the gods lined up, and Skadi’s eyes were masked. She intended to select her mate simply by examining his legs from the knees down. When she’d found the strongest-thinking them the beautiful Balder’s legs-she flung off her mask and found she’d picked the sea god Njord.. she he went off to live in the god’s ocean home.

    She was miserable there. “I couldn’t sleep a wink,” Skadi said… The couple moved to Skadi’s mountain palace, but the water god was as unhappy there as Skadi had been in water. Thereupon they agreed on an equitable dissolution, and Skadi took a new mate, Ullr, the god of skis.”

    Paraphrased text from Patricia Monaghan’s “The New Book of Goddesses and Heroines”

  6. Lou Dawson August 9th, 2013 9:47 am

    Hi Doug! Wasn’t yours, I had the name of the guy and have forgotten it, the tall patroller with the black, swept back hair, who worked with you guys for many years. Lou

  7. Don Bachman August 9th, 2013 10:44 am

    Hi Lou,

    Nice to see this article on the Skadi – as I glance up to the top of my bookcase where mine now rests. John Lawton also came to Crested Butte in 1969 where we signed him on as a National Ski Patrolman, and worked on further development of the device and antenna design. Later in 1971 at the INSTAAR San Juan Avalanche where Ed was the principal consultant, we were all supplied the Hot Dogs which were carried for the duration as we drove along Hy 550, and trapsed up the avalanche paths for dozens of fractureline profiles. We held many practice sessions and introduced the device to the Silverton Avalanche School in 1973. Those who probably also have Skadi Hot Dogs on top of their bookcases from those days include Richard and Betsy Armstrong and Rod Newcomb. Later avalanche beacon development, refinement and use, owe much to John and Ed, and their visionary quest.

  8. Oscar August 9th, 2013 3:32 pm

    Was Skadi really first? The barryvox 68 was used by the swiss military in 1968, I guess it had to be some development prior to the army using it!

  9. Lou Dawson August 9th, 2013 4:38 pm

    Oscar, I researched it all pretty carefully and as far as I can till Skadi was the first “real” beacon. As mentioned in my article, some other stuff had been in development as well, but all my sources told me it was pretty dysfunctional and that the Skadi was the first the was effective.

    But we’ll see what shakes out of the woodwork…


  10. Matt Kinney August 9th, 2013 5:06 pm

    I visited Ed C’s homestead in McCarthy awhile ago. I was shown a pair of beacons which looked really interesting. Not sure when he used or may have helped develop them. This seems like a good topic thread to show them off.

    Here’s a link to a web page where I have posted the pic. Any info on them would be appreciated.

  11. Greg August 9th, 2013 5:41 pm

    According to the Mammut website the Barryvox 68 was commissioned by the Swiss Army in 1968 and deployed after 2 years of development and field testing:
    So, looks like the Barryvox 68 was in production in 1970, but perhaps not yet available for civilian use.

    I’m a little sad that the case was not a red oval with cross and shield logo like the famous knives…

  12. Lou Dawson August 9th, 2013 5:50 pm

    Hmmmm, I’d like to get more story on exactly what that Barryvox really was, what frequency is used, if it really worked, etc. Everyone I spoke with back when I was working on the Skadi history said Skadi was the first “beacon” as we think of them (send/receive, designed for companion rescue, fits in pocket). But if I’m wrong I’ll rewrite. Perhaps when I’m in Europe this coming winter I can accurize. Whatever the case, thanks all for digging in deeper. Lou

  13. Lou Dawson August 9th, 2013 5:59 pm

    Don, thanks for chiming in!

  14. Lou Dawson August 9th, 2013 6:06 pm

    There is something strange in that Barryvox history. They talk about a “standard” of 457 being “newly introduced” during their circa 1968, but essentially the avalanche beacon as we know it had not been invented yet, so how could a “standard” have been created?

    According to the Wiki: In 1986, IKAR adopted the frequency of 457 kHz. In 1996 ASTM adopted the 457 kHz standard.[3]

    1986, not 1968. I wonder if some numbers got transposed?

    The Skadi used 2.275 kHz, and lots of European beacons used that freq until the “new” standard of 457 gradually took hold. During that period, there were even dual frequency beacons.

  15. Lou Dawson August 10th, 2013 7:46 am

    Matt, those beacons are super interesting, and the leather cases! I’m really starting to wonder who came up with the “first” one, defined as being adequately functional. Common wisdom seems to be that Skadi is the one, but I have to wonder when Redar was developed and retailed, and how/if it really worked very well. Again, same with Barryvox “68.” I think I know just the person to ask about this in Europe, so will pursue eventually.

  16. Art Burrows August 14th, 2013 8:02 am

    My first beacon as a patrolman. I used to ask myself, “Am I really using a beacon built in NY for the notoriousy fickle Colorado snowpack? It worked surprisingly well and was simple and easy to use. We’ve come a long ways since then in features and price, both have multiplied significantly.

  17. rod georgiu August 15th, 2013 9:59 am

    not related, but you might be able to help.

    I use a 6 mm static cord to tie to my climbing rope to rappel.
    I put the thick rope thru the anchor, rap on both ropes, then pull on the static cord to get the ropes down.
    The problem is that if there drag, the static stretches quite a bit and it’s almost impossible to pull the ropes down.

    what do you recommend?

    I use the static cord to save weight.

    I am considering using a 5.5 mm tech cord, and perhaps rapping just on the climbing rope, and using the tech cord just to pull the rope down.

  18. Lou Dawson August 16th, 2013 8:15 am

    Rod, to the best of my knowledge the way you’re rigging that can be dangerous. Ony rig with unequal ropes if you’re anchor is metal, as the unequal rope stretch can saw through webbing under load.

    There is a technique for rigging with a small trail rope that involves using a knot that jams against an anchor, allowing you to rappel only on the thicker line. We had some links for that on another blog post. I’ll find them. Lou

  19. Louie August 19th, 2013 5:33 pm

    Rod, I usually do my alpine climbing with a single skinny rope, and a 7mm tag line if double rope rappels are required. (I also like using half ropes, but I don’t own any at the moment) The technique I use requires a rap ring, or a quick-link at the anchor. I tie the ropes together, and then tie a clove hitch around a carabiner, which jams in the rap ring or quick link. When you pull the rope, you pull the side with the carabiner. The carabiner doesn’t fall quickly since you’ve only pulled about half the rope at that point. Of course, this makes snagged ropes a bit more likely. If I’m worried about getting the rope stuck, I rap on the tag line, and pull the climbing rope. That way it’s likely that by the time the rope gets stuck, I’ll have pulled some or most of the climbing rope, and can use it to climb up to the stuck rope, and retrieve it. Of course rappelling on the 7mm line is a bit questionable, so you have to be extra careful about rope damage, or sharp edges. The first guy can rap on both ropes, and have the climbing rope clipped in to the anchor, as a backup. Hope that makes sense.

  20. Louie August 19th, 2013 5:36 pm

    Actually I’m not sure on the diameter of the tag line, I’ll have to check.

  21. jon September 26th, 2013 8:07 am

    Not sure how much of a team it was? John built them in his basement after work. Took over the ping pong table apparently. He’s still a very very very sharp guy and could probably fill in some of the details.

  22. Joe Risi October 7th, 2013 2:17 pm

    Great story and followup! Thanks Lou

  23. Lou Dawson October 7th, 2013 2:26 pm

    Hi Joe, yeah, it’s cool that Lawton got in touch. I’d assumed he was not around anymore. What I don’t have is exact dates of when different products went to retail, to know who was really “first.” But common wisdom has always been that Skadi was the first unit that saved lives. Lou

  24. Hacksaw October 13th, 2014 4:06 pm

    I met Dr. Lawton’s son this weekend.

    Sometime I’m going to show him some more advanced transceivers.

  25. Mike Esten November 6th, 2014 12:42 pm

    I was active ski-touring in Switzerland from the mid 1960s onwards and the first avalanche rescue tranceiver that I came across was the Skadi in the early 70s when it was used by some of the ski patrols and guides. At the Vanni Eigenmann Foundation Symposium in 1975 the Autophon VS 68 was described as having been developed under the specification of the Swiss army. Presumably this is the device to which the Mammut website refers as I believe that Barryvox took over Autophon at some point.
    I still own a couple of the original Autophon VS-68s and I do not believe that they were available on the civilian market until well after the Skadi. However they were clearly developed before 1986 as witnessed by the 1975 symposium report, thus disposing of the transposition 1968/1986 hypothesis. How long the Swiss army had them to their exclusive use, I do not know.

  26. Bob Lord December 9th, 2015 12:44 pm

    Many thanks for capturing this all this history, Lou. I have a bit to add that may be of interest. I was a pro patroller at Beaver Creek/Vail from 1984 to ’89. We used the second-generation, flat, yellow Skadis. While I was there, I got interested in how the beacons worked and how they were developed. I have a background in electronics, and in my third patrol year I developed a tester that gave an indication of a Skadi battery’s level of charge. You plugged the tester’s cable into your Skadi’s charging port, pressed a button, and the tester instantly read out the level of charge on a row of LEDs.

    Coincidentally, my girlfriend’s family lived in upstate New York near Buffalo, and we drove back to visit them in the fall of 1986. While we were there, I got in contact with John Lawton and asked him if I could show him my tester. I hoped to get his blessing on the design. He was gracious enough to have me in his home at 326 Walton Drive (the address on the device) for the afternoon. His house still stands there, and I hope John does, too. I would guess he was in his 60s when I met him, placing him in his 90s if he’s still with us in 2015.

    John gave me the whole history of his beacon and showed me how it was manufactured. Much of that is lost in what’s left of my memory, but I do remember very clearly the answer to my question, “How did you choose 2.275 kHz?” Given his academic background, I expected a highfalutin’ answer backed by years of research directed at optimizing the range of the device. The answer I got though, was that he tried a prototype device with a variable frequency control on some 20-30 people of different ages. 2.275 kHz was the frequency that all the test subjects could hear the best. John was a scholar, but he was also a very practical man.

    John did bless my battery tester, and I set about manufacturing a batch of them, each constructed by hand in the evenings after I got off work on the mountain. In the summer of ’87, I attempted to contact John again to beg for a copy of his Skadi customer mailing list. I found that he had transferred the rights to Skadi to Brian Wakoff, a paramedic in Buffalo. Brian and I ended up sharing a product booth at the avi conference/school in Salt Lake City that year. Great guy. The orange address label you show in your article was the Sheridan Drive address Brian kept Skadi alive out of. Sadly, with new technologies in the wings, the following years weren’t kind to the world of Skadi. I can’t find any current reference to the company, although I see that Brian’s still in Buffalo and involved with the emergency-care community there.

    Under the name “Lordesigns”, I ended up selling my black-and-yellow Skadi testers to ski areas, highway departments, heli-ski operations, and some federal government agencies. The little product got me through several summers between ski seasons without other gainful employment. Perhaps some of you guys in this forum used the tester where you worked back then.
    As I remember, John said he had a son, Peter. Here’s a reference to an article Peter did defending the Skadi in 1976:

    We all owe John Lawton a vote of thanks. Not just for his product, but for keeping avalanche safety visible in the eyes of the public.

  27. William A Sokolich March 30th, 2018 11:13 am

    Did avalanche control at Alpental, located near Snoqualmie Pass, Washington beginning in 1976. The ski area supplied us with the Skadi transceiver manufactured by Lawtronics of Buffalo, NY. The “Hotdog” worked well especially with the volume control. It would go so low that you would hit the target almost exactly. I looking for a “hotdog” to donate to the Ski and Snowboard Muesem on Snoqualmie, Pass. If you have one contact by email

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