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Circuit diagrams of 13 cm ATV transmitter
In order to remember the 13 cm ATV project later with the proper details I made three drawings in "Paint". I made a .bmp circuit drawing of the transmitter, baseband circuit and microphone...
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2015
Dear readers of this blog,Best wishes for 2015 with lots of radiofun Masterpiece of engineering; "Spijkenniserbrug" near Pernis over the "Oude Maas"Pernis Railways...
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Dimension 4
In order to use digimodes like WSPR or JT-like modes you need an accurate computer time. Dimension 4 is an easy way to synchronize your computer's clock if you're running a Windows-based operating...
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Sardinia
The eQSL from Marco, IS0BSR shows the beautiful colours of a sunset.February 9, 2013 I made a SSB QSO with Marco on 20m SSB. Cala...
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eDX
EdX offers interactive online classes from the world's best universities. Online courses from MITx, HarvardX, BerkeleyX, UTx and many other universities. Topics include biology, business, chemistry,...
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50 MHz 10 Watt amplifier
I found some info of a 6m amplifier I built in 2007.It uses a VHF transistor 2N4933. I made the unit in order to give the SEM35 radio 10 Watts out instead of 1 Watt. The PA can only be used in FM and...
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Turkish QSL card
I received a QSL card from the Turkish Amateur Radio Club TA2KK. Operator of the 20 m RTTY QSO in August 2008 was Sencer, TA2AHS. The QTH of the Club station is located in the Asian part of...
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AIS
The Automatic Identification System (AIS) is an automatic tracking system used on ships and by vessel traffic services (VTS) for identifying and locating vessels by electronically exchanging data with...
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Raspberry Pi 2
The Raspberry Pi Foundation's low-cost computer was an instant phenomenon upon its release in 2012, and now, just shy of three years later, it's back with a new one. The foundation has announced the...
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Hungarian eQSL
Just received an eQSL from a PSK31 QSO I made with Gabor, HA0NGT, on 50 MHz in 2010.It is rare since I made only a couple QSO's on 50 MHz in digimodes.I think, the picture is a nice one and interesting...
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Fender amplifier
This week I had the opportunity to have a close look at a Fender Twin Reverb amplifier.This guitar amplifier has been equipped with four 6L6 tubes. Fender Twin...
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Confirmation 28 MHz contact with Greenland
Greenland is an enormous autonomous country within the Kingdom of Denmark, located between the Arctic and Atlantic Oceans.With a population of less than 60,000, it is the least densely populated...
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ATV transmitter in "QRP Nieuwsbrief"
Today I received the newsletter "QRP Nieuwsbrief" and saw that my article about the QRP ATV 13 cm transmitter was published on pages 12-15. I hope that my article inspires people to build this small...
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Confirmation 4m contact with Slovenia
Summer 2012 had some good moments for VHF sporadic E communication. I made an SSB 70 MHz contact with Joze, S51ZO June 10, 2012. This week I received the paper QSL:The website of Joze:...
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BC-696 transmitter
This week, at the radio club, a green radio, BC-696 was shown. This transmitter has been revised by Mans, PA2HGJ. He designed a Power Supply Unit for the valve transmitter so now it can be fed with 230...
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More Moore
Today I ran into an interesting visualization of Moores Law;the amount of integrated transistors versus time.Each 2 years the amount of transistors doubles. From the 4 bit 4004 processor from 1972 to...
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Holy Land contest
Today I made some QSO's with Israelian stations participating in the Holy Land Contest 2015.Conditions on 10 meter were ok since in 20 minutes I worked following stations:4Z67TL, 4Z5LA, 4Z5WC, 4X4JU...
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DIY LF oscilloscope
One of the most interesting Do It Yourself kits I saw recently is digital oscilloscope with a 2.4 inch color TFT display. The scope can show signals up to a frequency of around 200 kHz.The price is...
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Hybrid TV PCI Card
If you want to watch life TV on your PC you might install a DVB-T USB stick these days.A couple of years ago, when those USB sticks were not available, there were computercards that did the job.Last...
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70 cm WebSDR
Since begin this month a UHF 70cm WebSDR has been activated.The 70 cm antenna of the Software Defined Radio has been located in thecentre of the Netherlands, the Gerbrandytoren.The frequency range of...
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