Messages (for me!) from space station

Mark KB1GVR

When I started receiving packets via the International Space Station earlier this month, I noticed a familiar call: KB1GVR. He was one of the few North American stations who could pick up my packet beacons via PCSAT -- he would then relay them to the internet. This month, when I sent my sigs through the ISS, OM GVR spotted them, and sent reply messages to me via the packet system. I didn't get them via the satellite -- they came to me via the "Stations Heard Via ISS" web site. But still, it was fun to run into an old friend via the space station.

The Novice License: Two Years on PROBATION!

Somehow I remembered it as being one year, non-renewable, but Neil, WA4CHQ, wrote to tell me that he remembered a two year term. I think Neil is right. The excellent web page of the Novice Historical Society provides the details and many really nice stories from our days as novices. http://www.novicehistory.org/

555 Contest Finale

Jeri Ellsworth's 555 contest is in the home stretch, and I've got my acceptance speech all ready. "I'd like to thank the members of the Academy... and above all the people of the Azores, who were put at risk by the large kite that carried my 555 timer circuit and 35 mm camera over their unprotected heads..."

Here's my entry: http://www.gadgeteer.us/KAP.HTM

Forrest Mims is one of the judges. Here is what he had to say:

[The participants] displayed an absolutely remarkable range of engineering skills, creativity and dedication to meet the deadline. Also impressive was the use of video and photography to illustrate many of the entries.

This contest helps restore my confidence in analog designers, who have become a very small minority in electronics these days. Some of these projects do with great simplicity and efficiency what exclusively digital designers would have great difficulty emulating. Moreover, a number of these projects have potential commercial merit. Hopefully the developers will be able to pursue this.

The winners will be announced tonight at 9 pm Eastern Time:
http://www.555contest.com/news/

(Oh no! There must be some sort of mistake! I checked the list of finalists and my kite entry is not there!)

SolderSmoke Podcast #133

http://soldersmoke.com/soldersmoke133.mp3

April 19, 2011

-- KindleSmoke
-- Amazon's Whispernet (not to be confused with WSPRnet)
-- April 1 and the Perils of Plausibility
-- The difference (significant!) between Cream of Tartar and Tartar Sauce
-- A short Italian lesson
-- Polyakov QRSS
-- Snort Rosin's Mighty Mite (NOTE: NO FILTER!)
-- Fly Fishing in Space: 2 Meter Packet Beacons and the International Space Station
-- Upside-down Amplifier
-- Rock and Roll and Ham Radio: The Bob Heil Story
-- The Shuttle Discovery Lands in Northern Virginia
-- MAILBAG

Check out the new Ikea Microphone!

New HamStack Project Boards from Sierra Radio Systems

From Sierra Radio Systems (our sponsor):

We just got a batch of new boards that are a very handy companion to the HamStack CPU board. We call it a "Project Board". If you are embedding a CPU board into your own project, that works fine. However, if you want to build a stand-alone application, like a keyer, sequencer, DTMF decoder, reset timer, tone generator, whatever, you will need a power supply, connectors and some sub-circuits. That is what the project board includes. You plug the CPU board on top of the project board and you can program it to do all kinds of things.

The board includes the following sub-circuits...
Features
- 2 digital inputs with 10 pullup resistors to +5v DC
- 4 analog inputs with a selectable voltage range of 0-5 or 0-22 volts DC
- 3 high speed, quiet, SPST reed relays capable of switching up to 500 ma.
- 1 opto isolated digital output
- 1 RS-232 serial port
- 1 analog signal output that can generate a sine wave 0-5kHz at 0-5v DC
- 8870 DTMF decoder chip
- 1 Temperature probe input
- 3 additional general purpose CPU IO connections
- 5v DC power supply (supply rail for logic and analog chips)
- 2.5v DC power supply (bias supply for op amps)
- 3.3v DC power supply (supply rail for 3.3v parts)
- 5 pole low pass filter to condition the analog signal generators output

Ideas...
For repeater builders, you can use the DTMF decoder and relays to make a master site reset controller that sits outside the repeater controller.
You can use the tone generation function to make a portable or bench top test tone generator.
You can use the reed relays to do timer based computer resetting.
Make a CW IDer or beacon transmitter controller.
Battery voltage monitor. Read the voltage, when low, one of the reed relays keys the repeater transmitter and the tone generator send a beep or CW message.
Plus...
We are writing a really cool keyer app that will do iambic mode A/B, record and send programmable macros, with an LCD to show the speed and use a digital rotary encoder to set the speed.
The keyer will be open source and you can hack it to your hearts content.

Anyway, its the perfect platform to build a HamStack based ham radio project. The HamStack (and project board) supports programming in C or Basic.

Check it out on the web site www.hamstack.com

George
KJ6VU

Don Norgaard, W2KUJ -- SSB Pioneer

In SolderSmoke -- Global Adventures in Wireless Electronics I tell of how I struggled to understand the inner workings of my Hallicraters HT-37 single sideband transmitter. This rig used the phasing method of sideband generation, and as a kid I just couldn't understand how it really worked. And this really bothered me. As I recount in the book, through a QST article that was reprinted in the ARRL book SSB for the Radio Amateur, Don Norgaard came to my rescue and allowed me to understand the phasing method.

It was only recently that -- through reading the August 1998 issue of an Electric Radio Magazine article by Jim Hanlon, W8KGI -- that I came to realize that Don was one of the true pioneers of SSB. I think this blog post may be one of the first presentations online of a picture of OM Norgaard. The 1951 QST article notes that "the face may be unfamiliar."

In addition to writing very clear QST articles, Don was the creator of a rig that "revolutionized amateur use of SSB." It was a three tube 75 meter SSB transmitter called the "SSB, Jr." From Jim Hanlon's article: "It used nothing more complicated than simple coils, condensers, resistors, one carrier frequency oscillator crystal, four germanium diodes and three tubes in the classic phasing circuit to put out 5 watts PEP."

Three cheers for Don Norgaard! Three cheers for the phasing method!

PUT DOWN THE TARTAR SAUCE AND STEP AWAY FROM THE MICROPHONE!

Monday, April 4, 2011 11:27 AM

From:

"Steve"

"solder smoke"

CREAM OF TARTAR - A fine white powder used in cooking. It is the potassium salt Potassium bitartrate, KC₄H₅O₆. It is a food stabilizer and is also used in some baking powders.

TARTAR SAUCE - A sauce for seafood made from mayonnaise, pickles, and onions. It is unrelated to cream of tartar.

73 de Steve WA0PWK