du1vss (D.I.Y.)

It's all about ham radio. Although some of my projects involved transmitters, rf amplifiers and antennas that operate outside the ham bands, these things are solely for educational purpose only and experimentation.

Monday, April 23, 2012

Wilkinson Power Combiner / Splitter For VHF

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This technology was first used in the FM broadcasting industry wherein most of the solid state rf amplifiers were combined to arrive a h...

4 comments:

Saturday, October 29, 2011

Icom IC-2200H Adjustment Mode Jig

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In order to adjust the power output of the IC-2200H transceiver it must come to "Adjustment Mode" and we need also the...

17 comments:

Monday, October 24, 2011

Turnstile Antenna for FM Broadcast

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Above photo is the hand drawn illustration of my own version of Turnstile antenna used for my fm broadcast test stat...

Wednesday, July 20, 2011

Homebrew 30W FM Broadcast Amplifier

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The original diagram was taken from the data sheet of Mitsubishi 2SC1946A designed to operate at 175MHz. Both input and output t...

2 comments:

Monday, June 20, 2011

Collinear antenna for FM transmitter

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This collinear antenna works perfectly after the installation. The antenna is basically two dipoles excited in-phase and theoritically e...

1 comment:

Sunday, November 7, 2010

Amateur Radio Exam Result, October 2, 2010

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Feels good to have a new ticket. I would like to give thanks to my fellow hams (DX1CW) who have provided me the reviewers that made poss...

2 comments:

Friday, July 9, 2010

Automatic Battery Charger

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Here is a simple battery charger circuit intended for 12 Volt gell-type battery. Current is limited by the 7805 regulator IC and the...

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About Me

hevirred: Hello, I'm Vir, a ham radio operator with a callsign of DU1VSS. I hope you find this blog useful and interesting. Feel free to send me an email if you have questions about my project. Thank you and 73. hevirred@gmail.com

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