Information Net for February 3

Engineering Day

Read by: PAUL KJ4WQN

Saturday, Feb. 22 | 10 a.m. to 3 p.m.

Local engineers will be on hand at Adventure Science Center for its annual Engineering Day. During the event, visitors will have opportunities to learn about a variety of engineering specialties and participate in hands-on activities to help them gain a better understanding of the concepts used in the field.

Back again this year, Nashville Amateur Radio Club and local high school students will showcase and test their entries in the 7th Annual Music City Bridge Building Competition, presented by the American Society of Civil Engineers (ASCE), Nashville Chapter.

Nashville Amateur Radio Club
All Engineering Day activities are included with general admission, except where noted. Subject to change.

International: Canada to Get Five 60 Meter Channels

Read by: RANDY KJ4TFU

Industry Canada has granted Amateur Radio operators there the use of five 60 meter channels on a non-interference basis. The center-channel frequencies harmonize with those available to US radio amateurs on 60 meters: 5332 kHz, 5348 kHz, 5358.5 kHz, 5373 kHz, and 5405 kHz.

“[G]iven that use of these frequencies was requested, in part, to allow for cross-border communications in times of emergency,” Industry Canada said, “harmonization of the frequencies with the United States would facilitate such communications between the Canadian and the US Amateur Radio communities.”

Amateur stations will be restricted to USB, data, RTTY and CW modes, with a maximum bandwidth of 2.8 kHz, and a maximum power output of 100 W ERP — the same as the US allows.

“Canadian amateur operations shall not cause interference to fixed and mobile operations in Canada or in other countries,” Industry Canada ruled, “and, if such interference occurs, the Amateur Service may be required to cease operations. The Amateur Service in Canada may not claim protection from interference by the fixed and mobile operations of other countries.”

Elsewhere, Unión de Radioaficionados Españoles (URE) General Secretary Salvador Bernal, EA7SB, reported recently that Spain’s telecommunications regulatory agency has authorized the use of several 60 meter frequencies through June 30, 2014. The authorized center frequencies are 5268, 5295, 5313, 5382, 5430, and 5439 kHz, with a power of 100 W PEP and a maximum bandwidth of 3 kHz. Center channels authorized for the US and Canada differ. The URE is recommending that hams in Spain use USB on 60 meters, the mode employed in most countries authorizing operation on 60 meters.
In the Czech Republic, up to 10 radio amateurs are being permitted to operate on 60 meters on an experimental basis until the end of 2014. This experimental phase of 5 MHz operation follows an initial trial that ended two years ago. Czech Republic radio amateurs holding a special permit may use six channels that are common to many current 5 MHz ham radio allocations. The USB dial frequencies are 5288.5, 5330.5, 5366.5, 5371.5, 5398.5, and 5403.5 kHz. Experimenters will be allowed to operate 100 W ERP on USB and CW (+1.5 kHz from the USB dial frequency).

— Thanks to Industry Canada and Bryan Rawlings, VE3QN, URE and Southgate ARC

Brrrr….Wind Chill is Chilly

Read by: MARTHA KJ4RIQ

Introduction and Description
As a human you are constantly giving off heat. Every movement you make generates heat to warm the body as active muscles metabolize food faster than muscles at rest. In human beings, the average body temperature is 98.6° F. The human body has mechanisms for keeping itself at or near that temperature as any extreme derivation from the average (98.6) in either direction can harm the body. Some forms of temperature regulation in humans are:

Perspiring is a common method of keeping the human body cool as it offers an opportunity for wind to blow on moist tissue and cool it.

Shivering in cold weather is another mechanism of temperature regulation. This rapid movement activates muscles quickly and generates heat. As described in the above mechanisms the human body attempts to use its own movement and actions to receive benefit from the environment. What would happen if we moved a lot when it was warm. We’d be warmer. And if we had much wind blowing on us in the cold we’d be colder (even without perspiring).

Read by: RICK N9GRW

A phenomenon called the Wind Chill factor makes us feel colder in winter than the air temperature really is. This is due to the interaction of air temperature and wind on the human body that is already giving off heat. Both temperature and wind cause heat loss from body surfaces. A combination of cold and wind makes a body feel colder than the actual temperature.

You may hear it mentioned quite often on the news during the winter months. How do news weather persons know that when there is a 10mph wind with a temperature of 10 degrees F that the real temperature we feel is -9 degrees F?

There is a specific formula that can be used to calculate wind chill.

So is there an actual formula for wind chill?

You bet. Just in case you ever find yourself with a calculator, thermometer, and anemometer but without access to The Weather Channel, the Fahrenheit version of the equation looks like this:

Wind\_Chill = 35.74 + 0.6215T - 35.75V^{0.16} + 0.4275TV^{0.16}

T is the air temperature in degrees Fahrenheit, and V is the wind speed in miles per hour.

Frequently asked questions about D-STAR

Read by: JERRY KE4ETY

What does “D-STAR” stand for?
The D-STAR stands for Digital Smart Technologies for Amateur Radio. It is an open standard digital communication protocol established by JARL (Japan Amateur Radio League).

What can I do with the D-STAR radio?
4.8kbps digital voice (DV) mode and 128kbps data (DD) mode communications are available (DD mode is available with ID-1 only). When using DD mode with a PC and the D-STAR radio, high speed data communication is possible.

Can I send data with a voice transmission?
Yes, you can. In DV mode operation only, you can simultaneously send up to 950bps of data, such as call sign, short data message or GPS position with a voice transmission.

Can I make a call with foreign countries?
Yes, you can. The Internet gateway allows you to relay your call to a remote D-STAR repeater over the Internet. The D-STAR repeater call sign and IP address must be registered to the gateway server. Some restrictions may apply based on specific country regulations.

Can I use the D-STAR repeater without connecting to the Internet?
Yes, you can use a D-STAR repeaters a local repeater. You can also communicate with other D-STAR radios directly.

Can I receive a call only when the call is intended for me?
Yes, you can. the call sign squelch function opens the squelch only when you call sign is received.

How do I set a repeater call sign when I make a call to a desired station using a D-STAR repeater?
When you communicate with other D-STAR stations using a D-STAR repeater, it is necessary to set the repeater’s call sign in RPT1/RPT2 as well as the desired station call sign and your own call sign.

For example, when you make a call in the same zone (without using the Internet gateway), set the uplink repeater call sign in RPT1 and the downlink repeater call sign in RPT2. Set “CQCQCQ” for the desired station call sign, when you make a CQ call.

When you make a call in another time zone using the Internet gateway, set the uplink repeater call sign in RPT1 and the gateway call sign in RPT2. The gateway repeater has “G” setting for the 8th-digit. Set “/” plus downlink repeater call sign at the desired station call sign, when you make a CQ call.

Read by: GEORGE KC4TMV

D-RATS is a communications tool that allows stations to communicate via D-STAR radios using low speed data (DV data mode), Packet Radio and the Internet. D-RATS also provides for transferring of files and forwarding of messages from one user to another, automatically. D-RATS works as a message hub, allowing seamless transfers from one port to another can D-STAR help first responders using D-RATS.

D-RATS is a multi-platform integrated tool for communication using D-STAR radios . With only a pair of radios (or an entire repeater stack) a variety of data transmission methods are supported, including:

  • Instant-message chat
  • Automatic beacon messages
  • File transfers with error detection
  • Structured forms
  • GPS position reports
  • And much more!

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