Friday, February 20, 2015

What's the Difference Between Resistance and Impedance?

I was reading a Facebook discussion today and there was a lot of confusion between resistance and impedance. Someone was trying to measure a speaker with an ohmmeter and didn't understand why his "8 Ohm Speaker" measured less than 8 Ohms. One reply posted this link which I thought was pretty good...

Difference Between Resistance and Impedance

Wednesday, February 18, 2015

W9DUA D-STAR Repeater Update

A few days ago some Sangamon Valley Radio Club members and other friends from the central Illinois area got the gateway computer for W9DUA/R up and running again. The repeater is permanently linked to REF051 so it's tied together with D-STAR repeaters in Decatur and Bloomington. If you have D-STAR capability please tune up the machine nearest you and say hello to central Illinois hams!

5 Million Raspberry Pi Computers

I read earlier today that the Raspberry Pi Foundation reported than over 5 Million Raspberry Pi computers have now been sold. This number supposedly includes only true sales and does not include the number that have been given away for educational and philanthropic reasons.

Tuesday, February 17, 2015

Raspberry Pi and Arduino Tech Night

On Thursday, March 5, 2015 the Sangamon Valley Radio Club is hosting a "Show and Tell" evening that will focus on uses of the Arduino and Raspberry Pi single board computers that you've seen mentioned in Amateur Radio and Maker publications. The meeting will be held at 7:00 p.m. The location is:

American Red Cross Building
1045 Outer Park Dr.
Springfield, Illinois 62704-4408

An specific agenda is not yet finalized. There will be a presentation on considerations for applying devices such as these to an application and several SVRC members will be describing and demonstrating experiments they have been working with on their own. If anyone has an Arduino or Raspberry Pi project of your own you are welcome to bring it and share your story as well.

The SVRC will be supplying some light refreshments at the event. As such, if you are not an SVRC member, we ask that you please let us know that you will be coming just so we can get a rough head count.

There is no charge to attend.

If you plan to attend, please send an email to Roger K9LJB at:
president@svrc.org so we can plan for the refreshments.

Monday, February 02, 2015

Web Site Update

I've made a few edits to the EMCOMM Email Via Radio In Sangamon County, Illinois page on the main web site. In recent times the Byonics TT4 Tracker/KISS Mode TNC has become one of the dominant TNC types in the Amateur world. Just trying to keep people pointed in an appropriate direction.

Find out more or buy a TT4 at the Byonics web page