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Symmetrical T and H Attenuator Nomograph
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Even after computers became commonplace in cubicles and laboratories, engineers and technicians kept design nomographs around for cobbling together attenuators, filters, voltage dividers, etc. Trade and hobbyist magazines like Electronics World used to print them as full-page features on a regular basis, and I have posted many of them on RF Cafe over the years. This particular "Symmetrical T & H Attenuator Nomograph" appeared in a 1959 issue. Maybe the editor thought that "Symmetrical T, H, O, and Pi Attenuator Nomograph" would be too long of a title and that's why the "O" and "Pi" was omitted even though they are clearly included in the chart. As can be seen by inspection of the circuit constructions, the T and Pi configurations (top row) are "unbalanced" while the H and O configurations (bottom row) are "balanced." A quick WWW search turns up plenty of attenuator design apps that not only solve for the exact theoretical values of resistors but also will select the nearest standard value resistors. Some will even then calculate the resulting attenuation value based on those non-exact resistor values. Symmetrical T & H (and O and Pi) Attenuator Nomograph
Nomographs / Nomograms Available on RF Cafe: - Parallel Series Resistance Calculator - Transformer Turns Ratio Nomogram - Symmetrical T and H Attenuator Nomograph - Voltage and Power Level Nomograph - Nomogram Construction for Charts with Complicating Factors or Constants - Voltage, Current, Resistance, and Power Nomograph - Resistance and Capacitance Nomograph - Voltage, Power, and Decibel Nomograph - Resistance and Reactance Nomograph - Frequency / Reactance Nomograph
Posted July 1, 2019 |
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Copyright: 1996 - 2024 Web BSEE - KB3UON RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived... All trademarks, copyrights, patents, and other rights of ownership to images
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