( Brand: Mfj ), ( Manufacturer Part Number: MFJ-704 ), ( Type: Low Pass Filter ), ( Country//region Of Manufacture: United States )
The MFJ-704 is a high-performance, low-pass filter designed for use in amateur radio applications. This filter is specifically designed to improve the performance of your radio by reducing the noise and interference caused by common mode currents that can enter your antenna system through power lines and other electrical sources.
The MFJ-704 is a 150-ohm, 3-dB bandpass filter, which means it allows signals within its intended frequency range to pass through while blocking signals outside that range. It has a center frequency of 2.0 MHz, with a bandwidth of 20 kHz. This makes it ideal for use with HF (High Frequency) radios in the 1.8 to 2.2 MHz range, such as those used for the 160, 80, 40, 20, and 15 meter bands.
The MFJ-704 is built with high-quality components, including a ferrite toroidal core and high-quality capacitors, to ensure reliable performance and long-term durability. It has a compact, easy-to-install design, with a small footprint and a lightweight, anodized aluminum enclosure.
The filter is easy to use, with a simple, screw-on design that allows you to easily attach it to your antenna system. It has a threaded bushing that allows for easy mounting to a variety of antenna systems, including vertical dipoles, inverted L antennas, and Yagi antennas.
In summary, the MFJ-704 is a high-performance, low-pass filter that is designed to improve the performance of your HF radio by reducing noise and interference. It has a compact, easy-to-install design, with a wide bandwidth and high-quality components for reliable performance and durability.
Pros of buying a MFJ-704:1. Wideband Coverage: The MFJ-704 provides wideband coverage from 1.8 to 30 MHz, making it suitable for various amateur radio applications.
2. Broadband Suppression: It offers excellent broadband suppression, which helps reduce interference from other devices in the vicinity.
3. Flexible Installation: The MFJ-704 can be installed in-line or bypass-mode, giving users more flexibility in their setup.
4. Durable Construction: The unit is built to withstand harsh conditions, ensuring long-term use and reliability.
Cons of buying a MFJ-704:1. Size and Weight: The MFJ-704 is relatively bulky and heavy, which may make it difficult to transport or install in tight spaces.
2. Price: Compared to other filter options on the market, the MFJ-704 may be considered expensive by some amateur radio enthusiasts.
3. Potential Interference: While the MFJ-704 provides excellent broadband suppression, it may still introduce some level of interference during certain operating conditions.
Conclusion:The MFJ-704 is a high-quality, wideband filter suitable for various amateur radio applications. Its excellent broadband suppression, flexible installation options, and durable construction make it a reliable choice for many users. However, the size and weight, as well as the potential for some level of interference, may be drawbacks for some users. Ultimately, the decision to purchase the MFJ-704 should be based on an individual's specific needs, budget, and operating conditions.
Recommendation:If you are looking for a wideband filter with excellent broadband suppression and are willing to invest in a high-quality product, the MFJ-704 is a solid choice. However, if size and weight are a concern or if you have a tighter budget, there may be other filter options available that better suit your needs. It is always a good idea to conduct thorough research and compare various options before making a purchasing decision.
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Mfj low pass filter, looks in good shape.