Other Electronic Projects • Re: How to linearize a diode detector - So, - leave the tube in place to act as a buffer, - remove C302 so it stops rectifying, - then add a Log Detector to get a highly accurate detector. - an...
34 minutes ago
July 19, 2008
My walk to work in Rome
The BEST Jean Shepherd ham radio episode
My talk with Jean Shepherd
QRSS of .3 wpm = 1.3 Hz bandwidth
IZ4BFA in stereo CW
K1JT - The Knight with the Nobel Prize
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.
WSPR is the name of a computer program.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
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.
July 6, 2008
On the beach at Fregene
Calibration problems solved
First reports received
The Fun of Grabbers
Checking your signal via Blackberry
The Joy of Milliwatting
Chirp, Click, Drift in QRSS
Bury that Beacon?
Why so little US QRSS?
More US Grabbers needed
Elser in "History of QRP in US"
New Slides, WAC on ClustrMap!
MAILBAG: G0FUW reports EI9GQ victin of Knack
KC0PET on understanding our circuits
ON4FW sends FB pictures
KG6TCJ on QRSS calibration
W7ZOI on FD and calibration
W4NI on measuring harmonics
PE1OIT on GPS calibration technique