Home Page
Owatonna Steele County Amateur Radio 14-Apr-2017

OSCAR News - April, 2Ø1Ø

OSCAR Meeting
The next OSCAR meeting is 09-Apr @ 9:00 AM, the second Saturday of the month. Meetings are held in the meeting room at the Owatonna HyVee, 18th Street @ Oak Avenue.

The next SKYWARN meeting is 19-Apr @ 7:00 PM, the third Tuesday of the month. Meetings are held at the Owatonna Fire Station.

New License
One more graduate of the OSCAR Tech passed the exam. Listen for Randy KDěNUV.

Elmer Session
OSCAR hosted an Elmer session on 22-Mar.

Japan Emergency Frequencies From AR Newsline
A group called A1 Club DX of Japan issued a request that hams world-wide keep clear of several frequencies and blocks of frequencies that are being used for post quake and post tsunami relief efforts:

3.525 MHz+/-5KHz; 7.030 MHz +/-5KHz; 14.100 MHz +/-10KHz;
21.200 MHz+/-10KHz and 28.200 MHz +/10KHz.

ARES has been asked to help provide volunteers for the MS The Ride Across Minnesota for 2011. This year, the ride starts and ends in Rochester, with stops in Owatonna, Austin, Lanesboro and WInona. About 1200 bikes are expected. About 20 hams will be needed each day of the event, 25-Jul thru 29-Jul (Mon-Fri). Volunteers do not need to volunteer for the entire event. The event coordinator is Gordy, N0ZRD at 763-302-0018. More information can be found at the www.ms-scram.org web page.

Waseca Triathlon
The Viking ARC is looking for volunteers to help with the Triathlon on 31-Jul. Check in with Dennis NěRPI for additional information.

70cm Band Attack From Multiple Sources
A bill is working its way through Congress that would take the 420-440 MHz frequencies from Amateur Radio. The goal is to provide additional communication frequencies for first responders.

Nanoscoop From Multiple Sources
No, this does not have anything to do with the amount of ice cream in your cone. It is the shape of the electrode that might be used in lithium-ion (Li-ion) batteries. Researchers looked at the the physical changes of a micro-sized Li-ion battery during the charging process. They discovered the tin oxide anode distorted as the lithium ions flow, nearly doubling its length. With nowhere to go, the wire deforms and twists. Through multiple cycles, the anode eventually breaks. The nanoscoop design improves the structural integrity of the electrode.

Lead-Free Electronics From University of Leeds (UK)
European regulations ban the use of most lead-containing materials in electronic and electrical devices. Piezoelectric crystals are one of the components currently exempt until an acceptable replacement is developed. Researchers are evaluating a lead-free material called ceramic- potassium sodium bismuth titanate (KNBT) to determine if it can replace the more common lead-containing lead zirconium titanate.

World Sunlight Map
The World Sunlight Map is a cool way to see daylight and darkness on the globe at any given time. It also shows the current satellite image of cloud cover.

Ground Rod Installation From Radio World
With the winter coming to an end, its is time to start making plans to repair, replace, and upgrade our antennas. One important part of a good antenna installation is the ground rod. Unfortunately, pounding an eight-foot long ground rod into the rock soil around here can be a chore. One suggestion is to use the ground rod as a drill bit. Dull the end of the ground rod to simulate the tip of a drill bit and borrow a drill capable of handling the diameter of the ground rod.

Safety first is always called for. Be sure to make the call to Gopher State One Call before any project below ground.

Origin of the Second From From Multiple Sources
Last month we provided a brief history on the meter as a unit of length. The definition being used today is based on the speed of light. To determine what a meter is, we also have to define a unit of time. So what is a second?

Ancient measurements used the position of the sun and stars to track time. The day was divided into 24 parts. It wasn't until the 13th century the concept of minutes and seconds came into existence. This defined 86,400 seconds in a 24 hour day, or what is supposed to be one spin of the earth around its axis. Pendulum clocks of the 17th century allowed the second to be measured. Finally in 1956, the second was fully defined to a specific periods of revolution.

The development of atomic clocks in the 1960s provided a method to recreate the second. Based on the oscillation of a cesium atom, 9,192,631,770 oscillations occur in one second. One later discovery was that the atomic clocks were affected by the attitude they operated at. A correction was implemented in the 1970s to compensate.

Pot Hole Detection From Multiple Sources
Smart phones have the ability to collect and report a lot of data with the development of different applications (apps). The City of Boston is experimenting with an app utilizing the accelerometer and GPS components of a smart phone. The app would use the accelerometer to detect pot holes and report the GPS position. The challenge is looking for what the correct "signature" of a pot hole would be compared to other road defects or features.

Aluminum Connectors From Multiple Sources
AS copper prices continue to escalate, the use of aluminum in more applications is beginning to be looked at again. Aluminum is less expensive and lighter than copper. On the other hand, it has less conductivity and has a tendency to "creep", or distort over time. Researchers are looking at how to utilize metal housings to reinforce the contacts. The metal housing would provide the force necessary to keep aluminum contacts from relieving themselves due to creep.