Computers, Ham Radio, Radio, Technology October 17th, 2010
MYCallsign – the Malaysian Amateur Radio Callsign Query Mobile Application has been updated, now it comes with a new spiffy logo. The mobile application can be installed on most Nokia, Sony-Ericsson, Motorola and Samsung phones. The application can be used to display information regarding an amateur radio callsign, such as handle (fullname), apparatus assignment (AA) and AA expiry date, and it is handy for recording QSO information in the logbook.
The application is licensed under the GNU General Public License 2.0 and is available for download at MYCallsign GoogleCode website
The new MYCallsign logo was created by Piju (9W2PJU – http://9w2pju.hamradio.my)
diy, electronics, Radio, Videos September 15th, 2010
Foxhole radio receiver or Crystal receiver is a form of radio that does not operate on local oscillator, which makes it hard to be detected by other electronic device. One of the most interesting thing of Foxhole radio is that it could be operated without the use of batteries, as it is powered solely by the radio waves through its long wire antenna.
Foxhole radio was (supposedly) popular during World War II because it enabled the GI to receive radio broadcast in the middle of the war, particularly in France as the Germans has outlawed the use of radio by civilians, thus the American GI need to build their own receiver to receive broadcasts. Typical component of foxhole radio during those days are : a period razor blade (not the newer galvanized one), carbon (obtained from pencil) and some copper wire with woodblock or cardboard as its base.
I’ve found a video on Youtube on how to build a Foxhole receiver, it still requires considerable skills and experience to build a working version of the receiver though.