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Richard “Dick” Hayter
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Triple Tuned Band Pass Filter Measurements
As a learning exercise I measured the characteristics of a Triple Tuned Circuit Bandpass Filter in my junkbox. This is a board that came from the now retired kit from the company Kits and Parts.com. This kit is called the multiPig+. Details of this kit can ...

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Revisit AD8307 Power Meter Calibration
This year at our club, annual pig picking BBQ and show-n-tell I had a chance to borrow the kind services of fellow Knightlites member OM John, KU4AF and his brand new and beautiful digital spectrum analyzer. Connecting the Si570 based oscillator from my Swe...

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455 KHz IF Transformer Characterization
I found an unmarked IF Transformer in my junkbox which seems to have reasonable characteristics for use in my 455KHz IF stage for my shortwave broadcast band radio project. This one had a yellow inductor adjustment screw and a number of 29501 printed on one...

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AM Diode Simple Envelope Detector Measurements
As a part of a project to build a simple shortwave broadcast radio based on the published KD1JV design  Steve KD1JDV Shortwave Broadcast Rx  the opportunity was taken to perform some measurements of the 'simple' AM envelope detector circuit. Through this ex...

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Calculate VSWR for varying Reactance Values X
Great question from Richard N4PBQ as follows: "So as I'm analyzing my various antennas I understand that my antenna is at resonance when my analyzer reports X=0 for a particular frequency.  But that never seems to be the case outside of my dummy load and ev...

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Great question from Richard N4PBQ as follows: "So as I'm analyzing my various antennas I understand that my antenna is at resonance when my analyzer reports X=0 for a particular frequency.  But that never seems to be the case outside of my dummy load and ev...

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ELECRAFT BL2 Balun Measurements
The ELECRAFT BL2 BALUN Return Loss and Balance were measured as shown in the referenced links. The Balance measurements were performed according to W7EL's referenced document. Refer to pg 163 paragraph named 'Current Balun'. Elecraft BL2 BALUN Specification...

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Measuring Potentiometer Resistance Taper
I had some fun measuring the resistance of a linear 10Kohm potentiometer from my junkbox and designated B10K. I then measured an ALPS 10Kohm pot that is intended for audio applications. P/N RK0971221Z05. The taper for this pot is designated as type 3B by AL...

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David Clark Headphones amplifier design 2
The simple common emitter circuit was redesigned with an increased target collector current of 10mA. This allowed enough current to supply the 150 ohm load and ensure that the transistor was operating as a constant current source.    Varying emitter degener...

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David Clark Headphones amplifier design. 1
I was lucky enough to receive a pair of David Clark Headphones from my kids as a birthday gift. The model I have is the classic headset and mic designed for use in General Aviation cockpits and known as  Type H10.13.4 . This is the best selling headset in a...
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