SECTION 425: MISCHIEF. As per the Section 425 of the Indian Penal Code,1860 (hereinafter referred to as IPC) that whenever anyone performs an act either having an intention to cause or is aware that his act is likely to bring, some destruction or damage to any property, destroying or diminishing its value and utility, hence, resulting in an undue loss or damage to the public or any person is. IPC-DW-425: Design and End Product Requirements for Discrete Wiring Boards Rev A 5/90 Orig. 9/82: 03/94: IPC-DW-426: Specifications for Assembly of Discrete Wiring Orig. 12/87 IPC-TR-460: Trouble-Shooting Checklist for Wave Soldering Printed Wiring Boards Rev A 2/84 Orig. 1973 IPC-TR-461: Solderability Evaluation of Thick and Thin Fused Coatings.
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The ERI 425, 426, and 427 FM Isolation Transformer Series includes models rated to handle FM power levels of 25 kW to 50 kW across an AM tower base insulator operating with up to a peak voltage of 40,000 volts. Each model has three (3) versions that cover one portion of the FM band and they are factory tuned to a single FM frequency. Some multi-channel applications can be addressed with factory modifications. They are designed to be pressurized with nitrogen or dry air with 3 to 5 PSI (21 to 35 kPa), not to exceed ten PSI (69 kPa).
Isolation transformers couple FM across the base insulator of an AM broadcast station transmitting tower, with little or no effect on the AM base impedance and no mismatch into the FM antenna feed line. An isolation transformer is especially desirable for feeding high impedance AM radiators or towers that are part of a directional array where “bazooka” isolation systems would have adverse effects.
Each isolation transformer is supplied with a weather shield fitted with a cradle fitted with a 3-inch pipe flange on the bottom to accommodate a mounting pipe and two stainless steel straps to secure the tank to the mounting cradle. A horn gap is installed for lightning protection. For lightning protection heavy-duty DC short circuits between the inner and outer conductors of both the input and output.
Ipc 425 426 Pdf
425/426/427 FM Isolation Transformer Specifications
- 88 to 108 MHz, factory tuned to specified operating frequency
- 40,000 volts
- Approximately 60 to 70 pf
- Model 425 25 kW
- Model 426 40 kW
- Model 427 50 kW
- 0.05 dB, maximum
- <1.05:1 at tuned operating frequency ±500 KHz
- <1.1:1 at tuned operating frequency ±1 MHz
- DC short circuit across inner and outer conductors on both input and output.
- Signal level measured between the outside of the coaxial output line and the transformer grounded case will be at least 30 dB down from the FM carrier level.
- Supplied with cradle fitted with a 3-inch pipe flange on bottom and two stainless steel straps to secure tank to mounting cradle. Mounting pipe is customer supplied.
- Designed for gas pass operation with a recommended pressure of 3 to 5 PSI (21 to 35 kPa) not to exceed 10 PSI (69 kPa).
- Model 425 and 426 3-1/8-inch EIA, male
- Model 427 6/18-inch, 50-ohm, EIA, female
- Model 425 and 426 3-1/8-inch EIA, female
- Model 427 6/18-inch, 50-ohm, EIA, female
- Model 425 256 pounds (116.1 kg)
- Model 426 300 pounds (136.1 kg)
- Model 427 325 pounds (147.4 kg)
- Model 425 and 426 44 inches (1,118 mm)
- Model 427 60 inches (1,524 mm)
- 28 inches (711 mm)
Ordering Information
- Description
- FM Isolation Transformer Type 425 rated at 25 kW. Input is 3-1/8 inch EIA captive male. Output is 3-1/8 inch female. Input and output impedance is 50 ohms. Any single FM frequency from 88.1 MHz to 92.9 MHz.
- FM Isolation Transformer Type 425 rated at 25 kW. Input is 3-1/8 inch EIA captive male. Output is 3-1/8 inch female. Input and output impedance is 50 ohms. Any single FM frequency from 93.1 MHz to 102.9 MHz.
- FM Isolation Transformer Type 425 rated at 25 kW. Input is 3-1/8 inch EIA captive male. Output is 3-1/8 inch female. Input and output impedance is 50 ohms. Any single FM frequency from 103.1 MHz to 107.9 MHz.
- FM Isolation Transformer Type 426 rated at 40 kW. Input is 3-1/8 inch EIA captive male. Output is 3-1/8 inch female. Input and output impedance is 50 ohms. Any single FM frequency from 88.1 MHz to 92.9 MHz.
- FM Isolation Transformer Type 426 rated at 40 kW. Input is 3-1/8 inch EIA captive male. Output is 3-1/8 inch female. Input and output impedance is 50 ohms. Any single FM frequency from 93.1 MHz to 102.9 MHz.
- FM Isolation Transformer Type 426 rated at 40 kW. Input is 3-1/8 inch EIA captive male. Output is 3-1/8 inch female. Input and output impedance is 50 ohms. Any single FM frequency from 103.1 MHz to 107.9 MHz.
- FM Isolation Transformer Type 427 isolation transformer, 50 kW 4-1/8 inch input and output with adapters to 6-1/8 inch input and output, both female. Input and output impedance is 50 ohms. Any single FM frequency from 88.1 MHz to 92.9 MHz.
- FM Isolation Transformer Type 427 isolation transformer, 50 kW 4-1/8 inch input and output with adapters to 6-1/8 inch input and output, both female. Input and output impedance is 50 ohms. Any single FM frequency from 93.1 MHz to 102.9 MHz.
- FM Isolation Transformer Type 427 isolation transformer, 50 kW 4-1/8 inch input and output with adapters to 6-1/8 inch input and output, both female. Input and output impedance is 50 ohms. Any single FM frequency from 103.1 MHz to 107.9 MHz.