Those intrepid digital hams at the University of Twente have temporarily put their WebSDR receiver on six bands (we should lobby to make the expanded freq coverage permanent). It is really great. I love the waterfall display. Audio quality here is excellent. (I'm listening to 75 meter SSB now.) Check it out:
FROM W8KHK's POST: Here are a few more pictures of the ECHO beacon transmitter. These are identical to the actual flight hardware, used for testing and measurements. They now reside at the W2DU Florida QTH, and while the batteries have long since expired, if the solar cells are illuminated by a 100 watt bulb, or the actual sun, you can receive the transmitted beacon signal at 108 MHz. Low Tech by today's standards, but in those days it was hard to find transistors that would work above audio frequencies. Photo 21 shows a complete beacon system. To the bottom left is another transmitter, before potting. To the bottom right is another transmitter, potted and ready to be incorporated in the styrofoam "dish" assembly. Photo 22 is a close-up of the two transmitters from photo 21. Photo 23 shows an entire dish assembly, prior to potting in styrofoam. This space project, and many other early space projects from the Astro Electronics Products division of RCA will be chronicled in the soon-to-be-published Reflections III by W2DU.
http://www.soldersmoke.com
December 21, 2008
Tiber flooding, Italian @ (snail!)
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DSB 80 "Kickpanel" project:
Rig reform
Harder than SSB?
Do we need to match diodes?
Terminating balanced modulators
An antenna for my "spot" ("net") circuit, LED
Thinking of speech processing
Driver hotter than final
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MEPT QRSS:
VK2ZAY crosses Oz on 470 micro-watts
Using 9H1LO's grabber engine as time machine
My beacon box: 10 and 30 in same enclosure
Knights QSY to lower bands (temporarily)
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Theory:
Thanks for beta independence help
Why does feedback lower distortion?
W3JDR's Ne602 modeling
Grinding resistors for precision
Broken counter leads to learning logic
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Miscellaneous:
Wes updates site
Kanga USA is back
There is no SPRAT 13
AA1TJ's lightbulb rig
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MAILBAG:
Lyndon smells the smoke
Roger KA7EXM goes to Aikhabara
Mark KI7N hits Singapore's radio row
Bob KD4EBM's feedback on feedback
Mike KC7IT fixes Christmas lights with 'scope
Frank VK2AKG on YouTube solenoid concert
Mike AA1TJ working on return loss bridges
John K7JM says SS blog makes DXCC
Jerry NR5A on Solder-SETI, b'day
Ron WB3AAL 1K QSOs from AT
Alan N8WQ: Tree battery!
Jeremy N1JER and QRP-L QRSS group build
MERRY CHRISTMAS AND HAPPY NEW YEAR TO ALL!
This is a really excellent example of ham ingenuity. Michael, AA1TJ, has built an 80 meter CW transmitter from the components in one of the compact florescent light bulbs.
My frequency counter is broken, and this is providing an incentive for me to learn about logic, JK Flip Flops and all that. Hack-A-Day alerted me to what looks like a very useful simulator program (free download).
Randy's message:
1.5 watts out on 30 meters with total cost of 25 dollars. Here is the transmitter that Ben, N1VF, and friends are using for balloon operations.
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