Euro Zone: SolderSmoke Kindle-book Now Available

SolderSmoke -- Global Adventures in Wireless Electronics is now available on the Amazon.de (German) web site. Payment in Euros.
https://www.amazon.de/dp/B004V9FIVW

WONDERMARK! (Comics with the Knack)

As part of our occasional series on Knack-related comic strips, today we present Wondermark. This link will take you to the first page: http://wondermark.com/tink1/ From there, look for the little "NEXT" hand on the right of the comic. There are eight. All of them are gems. Also, be sure to check out the author's bio:
http://wondermark.com/about/

WSPR -- THE MOVIE!

VK2TPM made some nice videos of the Weak Signal Propagation Reporting System (WSPR) maps over time. Its kind of fun to watch the propagation shift from trans-Atlantic to trans-Pacific.

More: http://www.youtube.com/user/vk2tpm#p/u/4/U1sBGZzNv8s

T/R Success with WSPR

Thanks to everyone who sent in advice on my WSPR t/r troubles. I now have it all sorted out. In the image above you can see the cable from the serial port that carries the RTS T/R signal from the computer. It goes to a switching transistor that controls a relay that in turn switches the three relays that actually do T/R for the rig. One question: On the Linux computer the RTS signal seems to switch between +5 and -5 volts, but on the Windows machine it was +10 and -10. Why?
I'm really pleased to have the computer interface working. It is kind of neat to bring together the complex technology of the computer and the simple technology of a DSB/Direct Conversion rig.

Five Planets Visible in the Morning

The good folks over at spaceweather.com have once again alerted us to an important astronomical event: During May, early risers will be treated to a conjunction of Mars, Jupiter, Venus, and Mercury. (The fifth visible planet would be the one you are standing on!) The Moon is thrown in as a bonus. The photo above was taken by Liz Gleeson on Magnetic Island (Australia) -- what a great location!

More T/Rouble

I get the RTS signal when using a Windows PC, but when I try to switch over to a Linux computer, I don't get the T/R signal from pin 7. Is there some code or setting in Linux that I need to change to make this happen?

Working on T/R circuit for HB WSPR rig --need help!

I'm finally working on the PTT T/R circuit for my homebrew DSB /Direct conversion 30 meter transceiver. I hope to use the simple one transistor circuit from W3PM's FB HB WSPR rig.

But I need info on the PTT signal that will come from the computer serial port. Which pins on the 9 pin serial port connector? What kind of signal comes out? Is it 5 volts on transmit? What settings should I use in WSPR? RTS? Any other setting changes needed?

I hope to be transmitting AND receiving soon.

AMSAT OSCAR 7 -- No Batteries, Running Directly From Solar Panels

From the AMSAT site:

AMSAT-OSCAR 7 was launched November 15, 1974 by a Delta 2310 launcher from Vandenberg Air Force Base, Lompoc, California. AO-7 was launched piggyback with ITOS-G (NOAA 4) and the Spanish INTASAT. Built by a multi-national (German, Canadian, United States, and Australian) team of radio amateurs under the direction of AMSAT-NA. It carried Mode A (145.850-950 MHz uplink and 29.400-500 MHz downlink) and Mode B (432.180-120 MHz uplink and 145.920-980 MHz downlink (inverted)) linear transponders and 29.500 and 145.700 MHz beacons. The 2304.1 MHz was never turned on because of international treaty constraints.

In mid 1981 AO-7 ceased operation due to battery failures. It was thought at that time that the batteries had shorted. However on June 21, 2002, at least one of the shorted batteries went open-circuit, allowing the satellite to waken whenever it is in sunlight, and randomly begin operation in one of 4 modes.

According to the log at planetemily.com/ao7/ao7log.php, this old warrior is still supporting transponder action in mode A and mode B as recently as 9/10/09, and on a regular basis, whenever it is in sunlight.

When the satellite is in sunlight for extended periods of time, the 24-hour timer still switches the bird between modes A and B. Listen for the corresponding beacon to determine which mode the satellite is currently operating in, or refer to the above mentioned web page to see what mode has recently supported QSO\'s as the best estimate of what is the current mode of operation.

Please remember, there are no (functional) batteries, so the satellite\'s power input is limited to whatever output can be generated by the ancient solar panels. Use the least uplink power possible to minimize your downlink power usage, and maximize the number of simultaneous QSO\'s supported in the passband. There are other operating tips at:http://www.planetemily.com/ao7/usage.php
Linear transponder birds are a scarce commodity these days, so please use AO-7 responsibly, but please DO enjoy her!

50th Birthday of the Silicon Integrated Circuit

Robert Noyce got his IC patent on April 25, 1961.

Of course, wave soldering would be something to come out of California.

Free Kindle Reader for your PC

This link will take you to the download site. The software will allow you to use your PC as a Kindle reader.
http://www.amazon.com/gp/feature.html/ref=kcp_pc_mkt_lnd?docId=1000426311

Then be sure to get a copy of SolderSmoke -- The Book
http://www.amazon.com/dp/B004V9FIVW

SolderSMOKE APRS symbol

I've been setting up my satellite APRS station. This weekend I finally got the UI-view software running. I had to pick an icon -- this would be the symbol that would show up on the mapping software. In the Azores I had a nice little island with a palm tree. Here in Virginia, well, as I scrolled through the options, suddenly I saw something that seemed appropriate. The coordinates are a bit off, but that, my friends, is a smoke stack emitting 60/40 fumes.

How to Join G-QRP (and get SPRAT) in the USA

From the G-QRP web site:

Formed in 1974, the GQRP Club is a non profit organisation run entirely by volunteers to promote Low Power Radio. Whether you have a ham licence or not - everyone is welcome. Our quarterly magazine SPRAT provides a fascinating read containing articles of varying complexity, from simple test equipment, to fully functioning radio transmitters and receivers. Membership fees are about as low as you will find anywhere and our club sales service to members is second to none.

Indeed. Joining G-QRP and getting SPRAT is something all QRPers and homebrewers should do!

Some SolderSmoke listeners have asked me how they can join G-QRP from the U.S. Bill Kelsey is the club's man in America:

Bill Kelsey - N8ET 3521 Spring Lake Dr., Findlay, OH 45840 U.S.A.

$18 paid in USA.

Bill's e-mail and more info here: http://www.gqrp.com/memb_usa.htm

OR... You can pay directly via PAYPAL:

http://www.gqrp.com/paypaldx.htm