SWR Protection Circuit

This scheme is an SWR meter, which is quite simple and easily built. Once you make a directional coupler, the results will be displayed with the measure led meters as a ratio SWR.IC used in the scheme SWR meter is an LM3914, which are available on the market. Use non-inductive resistor (carbon-film or metal-oxide).Complete set of SWR protection...

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SteelSeries Seberia V2 Headset Aiming the Gamers and Audiophiles Heads.

SteelSeries has released a pretty cool set of full size headphones called Siberia v2 and they have the heads of Gamers and audiophiles turning! Siberia v2 headphones feature 50mm speaker drivers, a retractable head band, the frequency range is 10 to 28,000 Hz and they are of 32 ohm impedance.SteelSeries Siberia v2 incorporates an ‘invisible’...

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AWA Linc Cundall Memorial OT CW Contest

For two days this past week I participated in the AWA Linc Cundall Memorial OT CW Contest. This contest gives a significant multiplier to those using pre 1947 gear. I used a National NC-101X and one of my recent homebrew transmitters, a "46 job". I worked nine stations in four states plus Ontar...

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Runsheng Disc Demagnetizer SH-2A

How does an aluminum disc magnetize? The inks used on the the disc label may contain materials that can pick up a magnetic charges as they are moved in and out of their case and the CD transport, and whilst spun at high speeds. The impact of this magnetization is very acute on older discs, which can be sonically rejuvenated with a Disc...

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USSR HAM-Radio CallBook in 1926

I just found a very interesting paper - a complete list of all transmitting amateur radio stations in 1926 in the USSR, club stations, as well as personal ones.It is remarkable, that the frequencies and power levels of club stations are selected in such a way that ensures reliable traffic between distant regions and Moscow - the farther station from center, the higher its power and shorter its wavelength. And another note - individuals...

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Power Supply with Over Voltage Protection 10A 13.8V

This power supply circuit will give 10 amps (12 amps surge) with performance that equals or exceeds any commercial unit. The circuit even has a current limiting feature which is a more reliable system than most commercial units have.Just like other commercial units, this circuit uses the LM723 IC which gives us excellent voltage regulation....

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New VFO Spinner Knob - IC-R71E.

Today I replaced somewhat scratched old VFO spinner knob on the Icom IC-R71E with a new VFO Spinner knob rescued from a defective Kenwood TS-440 that was written off. The rubber trim around the side is better then the original Icom knob for tuning. Here are a couple of phot...

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Photo QSL Cards

QSL cards are a ham radio tradition that I was introduced to when I was a novice in 1966. My novice card then was a fairly generic design ordered 100 cards at a time from the Little Print Shop near Austin, Texas.These days I usually custom create my QSL cards to go with a particular event or location. Lots of places will print digital photos...

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My New Year's Resolutions, 2010

It's hard to improve upon perfection, but there are a few things I want to do to improve about myself:Get more exercise (> 3x a week)Get over 70% in all my modulesStart a personal website with one of the many domain namesExpand my friend groupTake up a sportGet good at CoD:MW2 online...Make 3 more resolutions...

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