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The News

Thu

01

Apr

2010

Amateur Radio Assists with Rescue in Great Smoky Mountains PDF Print E-mail
Written by Loyd C. Headrick   
Alum Cave Trail
The Alum Cave Bluffs Trail begins as a wooden bridge crossing Walker Camp Prong. [Photo courtesy of Scott Basford]

On Sunday, March 28 -- a day with a lot of rain, wind, sleet and, fog -- John Oakberg, NK4N, of Sevierville, Tennessee, went out hiking in the Great Smoky Mountains National Park near Mt LeConte. When he was about 1 mile up from Alum Cave Bluff, he came across Judy Potter, 57, of Atlanta who had broken her ankle while on the trail. Oakberg reached for his cell phone to call 911, but there was no coverage available. He then reached for his handheld transceiver and put out a call to any Amateur Radio operators who may be listening via some nearby VHF 2 meter repeaters.

Scott Wyrick, KD4CWB, of Seymour, Tennessee, told the ARRL that he was the first to respond to Oakberg's call. After he obtained the necessary information, Wyrick called the National Park Service dispatcher, requesting that they dispatch a rescue team. "John's signal was noisy into the machines, but two other stations -- Dean Webb, N4NLT, and Cleve Hayes, KB4UAL -- were able to copy him on the input frequencies," he told the ARRL. Wyrick lives in Sevier County, the same county where the National Park is located.

Webb, who was driving across Fort Loudoun Dam in Loudon County -- heard the emergency call calling for assistance on his mobile station on 146.940. "His signal was poor into the repeater and it was very scratchy," he told WATE, a television station in Knoxville, Tennessee. Webb and Hayes quickly set up a radio relay with Wyrick from John Oakberg on the mountain.

Smoky Mountains
The Alum Cave Bluffs Trail is a 5.1 mile footpath that gradually ascends approximately 2600 feet to the summit of Mt LeConte in the Great Smoky Mountains National Park. [Photo courtesy of Scott Basford]

Hayes -- who was at his home in Knox County for the relay -- told WATE that he "could relay what [John Oakberg] was saying to Scott, who was on the phone to the National Park Service to get the information that they wanted, such as height, weight, age and does she have any medical issues."

Wyrick told the ARRL that the rescue team was able to reach Potter after a few hours, around 2 PM. They carried her to safety several miles down the mountainside, reaching the staging area set up in the parking lot at the base of the mountain approximately three hours later. Paramedics treated her on the scene, but she refused transport via ambulance and left by private vehicle with her friends who took her to the Sevier County Medical Center for additional treatment. According to WATE, she is scheduled for surgery in Atlanta to pin and plate two broken bones in her left ankle.

"It hit a point where I was just in tears," Potter told WATE. "You can say you're going to be tough and get out of this, but you just get weary. And I think having somebody come an hour or two quicker and being able to get moving helped keep my spirits going. People all over the place that I don't even know helped me. Thank you!" -- Thanks to Scott Wyrick, KD4CWB, and WATE for the information

 

Fri

19

Mar

2010

Amateur Radio Quiz: Workbench Wisdom PDF Print E-mail
Written by By H. Ward Silver, N0AX ARRL Contributing Editor n0ax@arrl.org   

March 04, 2010


Even though you might be an inveterate tinkerer and builder, it's occasionally a good idea to put down those hot irons, sweep off the workbench and turn off the test equipment. This quiz is for you!


1) An Arduino is a type of ________________.
a. transistor array
b. microprocessor prototyping system
c. coax connector
d. Italian vacuum tube

2) Which is most likely to have a "bat handle?"
a. soldering iron
b. rack-mount enclosure
c. toggle switch
d. torque wrench

3) Which connector family is most closely associated with parallel data interfaces?
a. DB
b. USB
c. BNC
d. Centronics

4) What type of holes does a nibbling tool cut?
a. circles
b. squares
c. rectangles
d. irregular

5) What does DIP stand for?
a. Drill In Place
b. Dual Interconnection Pins
c. Dual In Line Package
d. Delta Insertion Point

6) What is the name for the solder composition with the lowest melting point?
a. Acid core
b. Eutectic
c. RoHS
d. Silver-bearing

7) A bipolar switching transistor's fully-saturated collector-to-emitter voltage is ___________.
a. 0.3 V or less
b. 0 V
c. 0.7 V
d. 5 V, +/- 10 percent

8) An op-amp's ability to change output voltage rapidly is called _____________.
a. beta
b. CMRR
c. slew rate
d. open-loop gain

9) What component is used to keep plate voltage out of an amplifier's output matching circuit?
a. Plate Choke
b. Neutralizing Capacitor
c. Bleeder Resistor
d. Blocking Capacitor

10) Which of these is a Germanium diode?
a. 1N28
b. 1N34A
c. 1N914
d. 1N4148

11) Which type of logic element's output is false when both inputs are true or both inputs are false?
a. NAND
b. NOR
c. XOR
d. D-type Flip-Flop

12) Winding parallel wires on a ferrite core is called _____________.
a. bifilar
b. trifilar
c. twisted-pair
d. scramble-wound

Bonus: An "orange drop" would be what type of component?

 

Answers

1. b -- www.arduino.cc
2. c -- Miniature toggle switches frequently have handles shaped like a baseball bat.
3. d -- Now mostly known as a "parallel port" connector, it was originally developed as a high-speed data interface by Centronics for its printers.
4. d -- A nibbling tool is used to cut irregularly-shaped holes in sheet metal in a series of small, rectangular bites.
5. c -- This is the most common package for through-hole components.
6. b -- Eutectic refers to the mix of metals that melts at the lowest temperature.
7. a -- The exact voltage depends on the circuit.
8. c -- Slew rate is measured in V/µsec.
9. d -- This component passes output RF, but not dc.
10. b -- Germanium is used for its special temperature coefficient and lower forward voltage drop.
11. c -- XOR stands for Exclusive-OR.
12. a -- Bifilar windings are used to balance multiple winding's electrical characteristics.

Bonus: Sprague's "orange drop" film capacitors have been around a long time.

 
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Quick Q's

This week, the Lighthouse Spring Lites QSO Party is April 1-11. The QRP ARCI Spring QSO Party, the SP DX Contest and the EA RTTY Contest are April 3-4. The Missouri QSO Party is April 3-5 and the Low Power Spring Sprint is April 5. Next week, look for the Montana QSO Party on April 9-11. The Japan International DX Contest, the QCWA Spring QSO and the Georgia QSO Party are April 10-11. All dates, unless otherwise stated, are UTC. See the ARRL Contest Branch page, the ARRL Contest Update and the WA7BNM Contest Calendar for more info. Looking for a Special Event station? Be sure to check out the ARRL Special Event Station Web page.

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