Friday, April 2, 2010

Transmit Beacon for Hand-held Radio

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The circuit is run by 555 timer IC for its PTT sequence that is 4 seconds "on" and 4 seconds "off". Transmission...
3 comments:
Thursday, January 28, 2010

Server Interface Set-up

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Here is a sample interface unit configured as a server. At the left of the interface is an IC-T2H portable transceiver where the interface...
Sunday, December 20, 2009

The Result of the Regular Examination Held at NTC Batangas

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The exam was held last October 3, 2009 at NTC Batangas. I took the exam for my upgrade (Class B license). Thanks to 4F1DY(Jyrus) of DX1CW wh...
2 comments:
Tuesday, November 10, 2009

Microphone Preamplifier

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Another weekend project is this microphone preamplifier which came from my new book Hints and Kinks for the Amateur Radio. The amplif...
2 comments:
Monday, November 2, 2009

My Home made Morse Code Keyer and Oscillator

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Learning morse code is fun and exciting. At first, I don't see the importance of it thinking that this is just an obsolete form ...
Monday, July 27, 2009

My 24Amps 13.8V Modified Regulated Power Supply

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I just brought my new Steady-Volt 24Amps, 13.8Volts power supply that cost several thousand bucks at RadioCom somewhere there in Pasay. ...
8 comments:
Monday, June 8, 2009

Homebrew your 4:1 Coaxial Balun

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When the antenna has an input impedance of 300 ohms balanced line, the 4:1 coaxial balun easily transforms this to match with our 50 ohms un...
1 comment: