Passive Audio Attenuators 

Learn to design T and H pads or use our handy calculator.

RF Resources Online 

Online converters, tables and charts for radio broadcasting.

Resistor Color Codes 

A convenient color-code chart to determine a resistor's value.

DTMF Information and Examples 

Dual tone multi-frequency tones are used for telephony and many remote control applications. This page covers the basics of the DTMF standard and provides playable audio samples.

DTMF Information and Examples 

Dual tone multi-frequency tones are used for telephony and many remote control applications. This page covers the basics of the DTMF standard and provides playable audio samples.

SWR Calculator 

A Java applet that calculates SWR based on the specified forward and reflected power levels.

SWR Calculator 

A Java applet that calculates SWR based on the specified forward and reflected power levels.

Determine AM Modulation with an Oscilloscope 

Use an oscilloscope to determine the modulation of an AM transmitter.

Determine AM Modulation with an Oscilloscope 

Use an oscilloscope to determine the modulation of an AM transmitter.

Tower Light Alarm Circuit 

This pseudo-binary circuit allows a single remote-control telemetry channel to indicate several variations on circuit status.

Starguide Relay Logger 

A utility to help diagnose contact closure and configuration errors for a Starguide broadcast satellite receiver. ZIP file.

StarGuide Relay Logger 

A utility to help diagnose contact closure and configuration errors for a StarGuide broadcast satellite receiver. ZIP file.

FCC ID Number Lookup 

Identify computer cards and other electronic components by their FCC ID number.

FCC ID Number Lookup 

Identify computer cards and other electronic components by their FCC ID number.

Tower Light Flasher Failure Alarm 

A simple interface and flash-failure circuit to interface to a station's remote control.

SCA Primer for Broadcasters (2002 edition) 

FM subcarrier services can be source of revenue for an FM station. They can also be a source of aggravation if not maintained properly.

Electrical Concepts and Practices - a Primer 

A collection of articles from Radio magazine's sister publication EC&M.

Western Electric 111C and 119C Transformer Information 

Pinouts and schematics for these popular, high-quality audio transformers.

Western Electric 111C and 119C Transformer Information 

Pinouts and schematics for these popular, high-quality audio transformers.

Variation on the Shielded-Loop AM Antenna 

A variation on the antenna’s construction.

Variation on the Shielded-Loop AM Antenna 

A variation on the antenna's construction.

Electronic Symbols True Type Font 

A True Type font set with electonic symbols.

Braided Shield Cable Preparation 

A simpler, cleaner method of preparing a braided shield for a connector.

Push-on/Push-off Switch 

Turn a momentary closure into a maintained contact.

Baking Magnetic Recording Tape 

Temporarily restore old tape for playback.

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