Wavelengths Publications

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United States
Pineville, KY
Wavelengths Publications

A special interest radio hobby project
located in Bell County KY. For amateur,
CB, and shortwave radio.
™© 2024

We are looking for radio techs, electronics designers, and anyone skilled in the hobby of radio electronics to combine our talents into a venture to utilize our talents for monetary purposes in our region. Some of us may utilize LTSpice and MMANA GAL as well as EZNEC software to aid in the design and analysis of electronic circuits and antennas, this skill is however not required if you know how to use a calculator.

07/13/2025

Nikola Tesla was very intuitive and innovative. He undertook to understand the concepts of alternating current and developed such things as the 60 Hz AC generator and 60 Hz AC powered electrical motor. He was a genius in this respect, when it came to creating the earliest things that fueled the electrical power industry. He even invented a small remote-controlled boat....

Nikola Tesla was very intuitive and innovative. He undertook to understand the concepts of alternating current and developed such things as the 60 Hz AC generator and 60 Hz AC powered electr…

07/02/2025

At this site, we promote the use of LTspice circuit design and analysis software, for both analysis and educational use in learning to design and analyze circuits. However, there is a world of interesting software that helps the electronics inclined individual to design and analyze such things as crystals and crystal filters, as well as LC low pass filters. Furthermore, there is software for designing toroid core coils and transformers, based upon toroid size and ferrite material mix....

At this site, we promote the use of LTspice circuit design and analysis software, for both analysis and educational use in learning to design and analyze circuits. However, there is a …

07/01/2025

What's up so far, and the coming solar cycle peaks, and a focus on antennas for the future solar conditions....

What’s up so far, and the coming solar cycle peaks, and a focus on antennas for the future solar conditions.

05/24/2025

Follow our website, and please like and share its content. Follow this link to learn more about our radio hobby site....

Follow our website, and please like and share its content. Follow this link to learn more about our radio hobby site.

05/02/2025

This simple circuit concept can be used to convert a 600-ohm handheld magnetic cartridge microphone to a voice band filtered 9 dB power microphone. And it can also be used to replace the circuitry inside an old D104 to use a 600-ohm cartridge microphone inside the D104 head. A lot of two way radios these days, use a 1k ohm potentiometer as the microphone gain adjustment, and hence, this circuit was designed to operate into such a load....

This simple circuit concept can be used to convert a 600-ohm handheld magnetic cartridge microphone to a voice band filtered 9 dB power microphone. And it can also be used to replace t…

04/15/2025

Welcome to the review of the "SI4732 Pocket Radio Receiver Full Band LSB USB AM FM with 800mAh Battery." Videos included. If you would like an HF shortwave receiver. small enough to take with you in your shirt pocket, and yet offers some serious features, then this little piece of technology is the thing. And its usual price is very low in terms of something as unusual as this....

Welcome to the review of the “SI4732 Pocket Radio Receiver Full Band LSB USB AM FM with 800mAh Battery.” Videos included. If you would like an HF shortwave rec…

04/13/2025

Everyone involved in the hobby of shortwave radio, eventually tend to find and settle down with listening to certain stations, and sometimes those stations come from near to the same areas of the world. The regional aspect of such stations in selection, are selected according to language or content such as regional news, or cultural music from those select locations. Or such selections are based upon listening to amateur radio stations in a region of the world, let's say Australia for instance....

Everyone involved in the hobby of shortwave radio, eventually tend to find and settle down with listening to certain stations, and sometimes those stations come from near to the same areas o…

04/12/2025

In the featured photo above, we see a circuit diagram of the Franklyn VFO, as drawn by Michael J Murphy WU2D. Note the interesting way of controlling the VFO level by way of Q3. This VFO concept comes to us from the vacuum tube era, when vacuum tube heat caused a lot of VFO drift. Even with low powered transistors, thermal drift is still present and must be controlled....

In the featured photo above, we see a circuit diagram of the Franklyn VFO, as drawn by Michael J Murphy WU2D. Note the interesting way of controlling the VFO level by way of Q3. …

04/09/2025

Over the years, I have often felt the need to comment or to propose rule making suggestions to the FCC. I must admit that comments and rulemaking at the FCC is highly competitive. And depending upon who all is in charge at the top, which consist of the main members of the Commission, they may not see the wisdom of your vision, and well, that is how it goes....

Over the years, I have often felt the need to comment or to propose rule making suggestions to the FCC. I must admit that comments and rulemaking at the FCC is highly competitive. …

03/27/2025

Part 2 of our transistor design and analysis series.

Part 1 | Part 2 Contents 1. Brief Review 2. Collector Load Study Circuit 3. What Controls What in a Transistor 4. Predicting AC Performance with Our Plots 5. Average …

03/17/2025

The voice band sweet spot as defined by amateur radio operators, consist of the audio spectrum range of 100 Hz to 2900 Hz, where these two start and stop frequencies are the - 3 dB bandwidth specifications. In listening to AM and single sideband via an SDR radio, where the user can adjust the audio passband, it is noted that with weak AM signals that if you adjust the low frequency to 100 Hz and the high frequency to 2900 Hz in the audio passband filter feature, weak AM signals are more intelligible....

The voice band sweet spot as defined by amateur radio operators, consist of the audio spectrum range of 100 Hz to 2900 Hz, where these two start and stop frequencies are the – 3 dB ban…

03/16/2025

Download LTspice | Analog Devices Here we want to look at how to use LTspice software to analyze a transistor model. In which, we can analyze the key specifics of operation based upon such things as the beta of the transistor, its input impedance, and its characteristic collector current curves versus input current and input signal level. Afterwards, using the data from these various parameter plots, we can design a transistor circuit for audio of rf use....

Download LTspice | Analog Devices Here we want to look at how to use LTspice software to analyze a transistor model. In which, we can analyze the key specifics of operation based upon such t…

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Pineville, KY
40977

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