
( Brand: Johnson ), ( Manufacturer Part Number: 250-35 ), ( Type: Low Pass Filter ), ( Country/region Of Manufacture: United States )
The 250-35 Johnson Filter for ham radio is a high-quality, essential component in any amateur radio setup. This filter is designed to improve the performance and signal clarity of your radio system by reducing interference from external sources.
The 250-35 Johnson Filter is a wideband, low-pass filter, specifically designed to operate between 250 MHz and 3500 MHz. This wide frequency range makes it suitable for use with various ham radio bands, including the 2-meter, 70-centimeter, and 23-centimeter bands.
The filter is constructed using high-quality materials, including a dual-layer ceramic substrate and gold-plated terminals. This ensures reliable operation and a long lifespan, even in harsh environmental conditions. The filter has a maximum power rating of 150W, making it suitable for use with high-power radio transmitters.
The 250-35 Johnson Filter is easy to install, with a compact size and a threaded mounting flange that can be attached to most ham radio antennas. It features a low insertion loss of less than 0.5 dB, ensuring minimal signal degradation, and a high rejection of out-of-band signals, reducing interference and improving signal-to-noise ratio.
In conclusion, the 250-35 Johnson Filter is a must-have for any ham radio enthusiast looking to improve their radio system's performance and signal clarity. Its wide frequency range, high power rating, reliable construction, and easy installation make it a versatile and reliable solution for reducing interference and improving signal quality.
Pros of buying a 250-35 Johnson filter for a ham radio:1. Improved reception: The filter can help reduce interference and improve the signal-to-noise ratio, making it easier to hear weak signals.
2. Better performance: The filter can help reduce unwanted frequencies and improve the overall performance of the radio, making it easier to use and more enjoyable to operate.
3. Wide frequency range: The filter covers a wide frequency range, making it compatible with a variety of ham radio bands.
Cons of buying a 250-35 Johnson filter for a ham radio:1. Cost: Filters can be expensive, especially high-quality ones like the Johnson 250-35.
2. Installation: Installation can be tricky, especially for those who are not familiar with the internal workings of their radio.
3. Limited utility: Depending on the specific radio and antenna setup, the filter may not provide a significant improvement in performance.
Conclusion: If you are experiencing interference or poor reception on your ham radio, a filter like the Johnson 250-35 can be a worthwhile investment. However, it is important to consider the cost and potential difficulty of installation before making a purchase. It may be worth consulting with a ham radio expert or doing some research to determine if a filter is necessary and which one would be best for your specific setup.
Recommendation: If you decide to purchase a filter, it is recommended to choose a reputable brand like Johnson and to carefully follow the manufacturer's instructions for installation. Additionally, it may be helpful to consult with a ham radio expert or do some research to ensure that the filter is compatible with your specific radio and antenna setup.
The filter has wear from storage use like scratches, scuffs, dust and dirt. Comes with a short RF cable and original bracket without hardware.
Johnson company made in the USA low pass filter model sold as is, untested, please see high-res photos for more details.