Rome Workbench

Here is the workbench, now located in Rome. If you look closely, between the two shelves on the wall you can see my "tool hanger." It is just six inches of insulated wire on which I hang diagonal cutters, pliers, wire strippers, etc. You can also see my little HAMEG 'scope.

Dan's Small Parts Back in Operation

http://www.danssmallpartsandkits.net/

Dan is a great source of parts for Knack victims. Check out his catalog -- take a look at his special deals.

VE7SL Identifies Mystery Military Radio

That's the one. That's the radio that Giorgio, I0YR, and I have had our eyes on. I found it in a local charity shop (location to remain secret, pending final transaction!). The one I found had no identifying plates, but with the scant info I provided in SolderSmoke 88, Steve, VE7SL, figured out what it was, and sent this picture to confirm. Not a BC-348, but instead a USMC BC-312.
UGLY BEAST! Not my kind of rig, but Giorgio may want it. Thanks Steve!

Check out Steve's web page: http://www.imagenisp.ca/jsm

Shep, SETI, Radar, Spark Coils

In this episode Shep builds a 2 meter rig to talk to locals, but picks up signals from much farther away. Musings on extraterrestrial DX. Also, our hero gets zapped by a spark coil.
As always, it takes Shep a while to get going on the ham radio stuff, so you might want to fast-forward through the groovy 1965 small talk at the beginning. EXCELSIOR!
Here is the mp3: Shep, 1965, 2 meters, SETI, Spark Coils.

The SolderSmoke Microphone

As promised, here is the infamous SolderSmoke microphone, featuring duct tape, and supported by a Radio Shack "Third Hand."

Check out the "popping on the letter P" audio filter I made out of a bathroom drain filter, a baby wipe, and duct tape. The previous effort using some foam from an old Walkman headphone is also visible.


Kind of appropriate, don't ya' think? I think this simple filter has helped with the audio problem.
(Let me know what you think.)

SolderSmoke #88

July 19, 2008

http://www.soldersmoke.com

My walk to work in Rome
The BEST Jean Shepherd ham radio episode
My talk with Jean Shepherd
NR5A's beacon
200 Knights
QRSS of .3 wpm = 1.3 Hz bandwidth
IZ4BFA in stereo CW
K1JT - The Knight with the Nobel Prize
WSPR
Drain cap audio popping filter
Help ID a BC-348 
Dan's Small Parts to return 
The British Amateur Television Club: Knack to the Max
ADVERTS:  N3ZI's Freq Counters, Gadgeteer Books
MAILBAG: Home Counties QRP Club, LU1CBL's BA Beacon,
I2NDT's Thailand Beacon, KI4UZI listens at Cape Kennedy, 
KD0BIK's podcast, AF4UI's LC meter, KD4EBM on Coherent CW,
ZL3TKA IS NOT CRAZY,  7J1AWL reading "Crystal Fire," 
M0JFE wants HB phone, VK7AX rebroadcasting SolderSmoke in 
Tasmania, M0NDE caught The Knack at age 6.  

The QRSS Knight with the Nobel Prize

We are in some very distinguished company on the QRSS "Knights" mailing list. Joe Taylor, K1JT, is active in the group. Joe won the Nobel Prize in Physics in 1993. His biography includes references to ham radio that will warm the hearts of all Knack sufferers: K1JT's bio

This year, Joe created a new piece of software that is being used by many of the Knights. It has a name that will appeal to QRP'ers. Here is a description:

WSPR is the name of a computer program.
It is pronounced "whisper",and stands
for "Weak Signal Propagation Reporter";
it implements transmitting and receiving
functions for a digital soundcard mode
called "MEPT_JT", which stands for
"Manned Experimental Propagation
Tests, by K1JT".

WSPR generates and receives signals
using structured messages, strong
forward error correction,
and narrow-band 4-FSK modulation.  Its
principal design goal is reliable
copy at very low signal levels.  In
practice it works well at
signal-to-noise ratios down to -27 dB in a
reference bandwidth of 2500 Hz. 

Joe recently released a new version of WSPR, so if you are going to give this a try, make sure you do so with the most recent release. You can download WSPR 1.0 (r972) from

http://physics.princeton.edu/pulsar/K1JT/WSPR100.EXE

The BEST Jean Shepherd Ham Radio Episode

Mark, W8MOJ, found this one a while back, but then somehow we lost it. This morning I found it again. Jean Shepherd talks about ham radio homebrewing, regen receivers, searching for parts at radio row, building stuff in the basement, secretly studying for his ham license during civics class, and one of his teenage ham friends who, in his basement, secretly built a.....

"Other kids would draw Christmas trees and sailboats... I would draw schematics of phone transmitters."

Don't miss this one! Here is the link to the mp3 file: Jean Shepherd, January 24, 1973

N3ZI's $9.99 Counter Kits

Doug, N3ZI, was one of the intrepid participants in the ARRL Homebrew Challenge competition. FB! He is now making available some very inexpensive digital frequency readout kits. Jerry, NR5A, sent me one. (Thanks Jerry!) Obviously this is a kit useful to Knack victims.

Here is the web site for the kits: http://www.pongrance.com/

UK Amateur TV: KNACK TO THE MAX

You will really like the video archive of the British Amateur Television Club. Start out with the "Bob and Brian" show. It is as if "60 Minutes" did a segment on THE KNACK. Don't miss the excellent antenna lecture by Dud Charman, G6CJ. He used small-scale antennas at UHF to demonstrate the principles behind directional antennas. All of the videos in the archive are very good. Thanks BATC!

Here's the link: http://www.batc.tv/channel.php?ch=1

My Beacon (MEPT) Circuit

Guys have been asking to see the schematic for my 30 meter QRSS MEPT beacon. Here's the oscillator circuit. This actually started out on a plane ride. My son Billy and I were talking about electronics. I drew a basic schematic for an oscillator, and we built one when we got home. It originally used a 20 meter crystal. At one point we were playing "find the oscillator" -- hiding it somewhere in the house, and tracking it down with a Sony shortwave receiver. Now, with some modifications, it is the first stage in my 30 meter MEPT beacon.

An ugly schematic for a rig built with the ugly construction technique. Nothing fancy here. Two feedback amps and a PNP transistor as a switch to key them. I let the oscillator run continuously. (Let me know if you can hear the "backwave"!) About 20 mw out. As you can see, it doesn't take much to get a QRSS signal on the air.

Shepherd Learns Morse and Discovers Ham Radio

Here is another gem from Jean Shepherd. He describes his discovery of CW at age 6 or 7, his first shortwave receiver, and his discovery of amateur radio. Plus, some Army Signal Corps madness.

Click here for the mp3 audio file: Shepherd, Morse, Ham Radio