It seems we all have a collection of notes and diagrams that we refer to for solving problems or for unique situations. Don't keep them to yourself, share them with the industry. Everyone can benefit from these little problem-solving devices and gadgets. Radio magazine wants to hear from you. Send your Engineer's Notebook ideas to radio@penton.com. Remember, your submission may count towards SBE recertification points.

Also, if you have a problem and you can't find a solution, let Radio magazine know. Our staff of technical consultants and authors have considerable experience in every technical aspect of radio.

Linear Digital Audio Data Rates and Storage  Dec 1, 2007 12:00 AM Need to figure the necessary storage sapce for audio files? Use these equations to make it easy.

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

AES3 Passive Converters  Build passive AES3 balanced-to-unbalanced and unbalanced-to-balanced converters.

Baking Magnetic Recording Tape  Temporarily restore old tape for playback.

Lattice Combiner/Splitter  Build a lattice combiner/splitter.

Western Electric 111C and 119C Transformer Information  Pinouts and schematics for these popular, high-quality audio transformers.

AM Radial Sniffer  Find copper radials in an AM antenna system with a field-intensity meter. These tips show you how.

RF Resources Online  Online converters, tables and charts for radio broadcasting.

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.

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.

Shielded-Loop AM Antenna  Build a shielded-loop AM antenna.

Variation on the Shielded-Loop AM Antenna  A variation on the antenna's construction.

TCP/IP Port Numbers  Dec 1, 2007 12:00 AM In TCP/IP and UDP networks, a port is an endpoint to a logical connection and the way a client program specifies a specific server program on a computer in a network.

IP Subnets  Dec 1, 2007 12:00 AM A handy reference of IP subnets.

Two Momentary Switches to a Maintained Switch  Turn two momentary closures into a single maintained contact.

Time Calculations with a Calculator  Adding and substracting time isn't difficult if you know the secret. No special calculator is required.

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.

Commonly Used Conversions  This handy collection of formulas and Java converters will help any radio engineer.

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

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.

Electrical Concepts and Practices - a Primer  A collection of articles from Radio magazine's sister publication EC&M.

Braided Shield Cable Preparation  A simpler, cleaner method of preparing a braided shield for a connector.

Electronic Symbols True Type Font  A True Type font set of electronic symbols.

Push-on/Push-off Switch  Turn a momentary closure into a maintained contact.

Reporting a Tower Light Outage to the FAA  When a tower is not properly lit because of a light outage, the tower owner is required to notify the FAA. Here's how you do it.

Unattended Operation - FAQ  Click here to read more: www.fcc.gov/mb/audio/bickel/noonehome.html

FCC Radio Frequency Interference Manual  The FCC has prepared a guide to help troubleshoot consumer interference problems.

Javascript Clock  Dec 30, 2005 12:00 PM Insert this Javascript code into your Web page to display the computer's time and date in a form that follows the mouse.

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