JOHNSON 148-202 Capacitor Air Tuning

( Brand: Johnson ), ( Manufacturer Part Number: 148-202 ), ( Part Type: Air Capacitor )

Review JOHNSON Variable Capacitor Air Tuning Very Good Cond

The Johnson 148-202 capacitor is a component essential for air tuning applications, specifically designed for use in radio transmitters and other electronic equipment where precise tuning is required. This part is a variable capacitor, which means it can be adjusted to change its capacitance, thereby altering the resonant frequency of the circuit.

The Johnson 148-202 variable capacitor is a dial calibrated type, making it user-friendly for fine-tuning adjustments. Its capacitance range is from 35 to 230 pF (picofarads) in 1 pF increments, enabling accurate calibration and optimization of the air tuning circuit. The capacitor element is made from aluminum and is constructed to ensure robustness against environmental conditions, making it suitable for outdoor or challenging application environments.

The Johnson 148-202 capacitor exhibits a low loss factor and high Q value, which contribute to its excellent tuning performance. The low loss factor ensures minimal energy dissipation, whereas the high Q value indicates a high level of capacitance consistency and stability across the entire tuning range. This stability makes it an ideal choice for applications where maintaining a steady resonant frequency is crucial.

The size of the Johnson 148-202 capacitor is compact, with a length of approximately 3.4 inches, and the body has a diameter of around 2.1 inches. The capacitor comes with a dial-mounting flange, which has a convenient 2-3/8 inch diameter and mounting holes, allowing easy attachment to the tuning knob or other mounting surfaces. The electrode assembly in the capacitor is engineered to provide adjustment ranges with minimal backlash and smooth operation.

In summary, the Johnson 148-202 variable capacitor is a versatile and high-performing component in air tuning applications. Its wide capacitance range, low loss factor, and high Q value together contribute to its high tuning accuracy, consistency, and stability. The compact size, user-friendly dial calibration, and robust aluminum element construction make it a reliable and cost-effective choice for applications demanding precise and efficient tuning capabilities.

Johnson 148-202 capacitors are used for air tuning in radio transmissions and are an essential component for adjusting the resonant frequency of the transmitting antenna. Here are some pros and cons of buying a Johnson 148-202 capacitor for air tuning:

1. Versatility: Johnson 148-202 capacitors come in a wide range of capacitance values (from 50 to 1200 pF) in a single knob design, making them ideal for various applications and frequencies.

2. Convenient: Air tuning offers the ability to adjust the transmission frequency while the transmitter is still on, making it more convenient to operate than manual or knob tuning methods.

3. Durability: Johnson capacitors are known for their high-quality and reliability. They are designed to withstand the rigors of outdoor use and can last for many years with proper maintenance.

1. Cost: Johnson 148-202 capacitors can be more expensive than other tuning options due to their high-quality components and design.

2. Size: The size of the capacitor can be a limitation for some applications, especially if space is a concern.

3. Interference: The presence of the capacitor in the radio transmission path can introduce some interference, leading to a slight degradation in performance.

In conclusion, Johnson 148-202 capacitors offer the convenience and versatility of air tuning, making them a popular choice for radio operators. However, their high cost and size can be a drawback for some users. Additionally, while the interference introduced by the capacitor is generally minor, it may be a concern for those requiring the highest levels of signal purity.

My recommendation would be to carefully weigh the benefits and drawbacks of a Johnson 148-202 capacitor against your specific application requirements and budget. If air tuning is a must-have feature and the cost is not a significant concern, then these capacitors can be an excellent investment. Otherwise, you may want to consider alternative tuning methods or lower-cost options that may be more suitable for your needs.

Details:

Johnson Variable Capacitor 148-202 Very good condition.

part #: 148202 price

• $18.99

specifications vintacapacitor:

• brand: Johnson
• mpn: 148-202
• part type: Air Capacitor

offer vintacapacitor:

• started: November 21, 2024
• quantity: 2
• options: Ship-to-home
• sold: 0
• availability: In Stock

returns vintacapacitor:

• policy: No Returns

general vintacapacitor:

• condition: Used
• Vintage Audio Video > Vintage Parts Accessories > Vintage Capacitors

seller vintacapacitor:

• city: Reading, Pennsylvania
• rating: 100.0%
• # reviews: 2671

shipping vintacapacitor:

• carrier: USPS
• class: Standard
• type: Calculated
• transit: 4-11 Days
• service: USPS Ground Advantage
• cost: $0.00

payments vintacapacitor:

• other
• credit card: Visa
• wallet: Google-pay

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