Amateur radio bandpass filters

AM broadcast stations transmitting in the frequency range from kHz to kHz cause havoc with HF and VHF receiving operations, often inducing carriers, modulation, broadband noise and other disturbances into delicate equipment. Such interference can frequently be heard mixing with other received signals in the shortwave bands and commonly overwhelms front ends of modern receivers. Broadcast reject filters reduce AM band signals to levels where local Stations can still be received in most cases, but are no longer threatening to other desired services. A must for serious low frequency DXers or Amateur Meter enthusiasts.
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14.10.2020
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Band Pass Filters

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RF and AF Filters

Anyone who has ever been blindsided by RF interference caused by nearby transmitting stations while operating on Field Day or during a multi-radio contest should become well acquainted with our Word of the Day— Band Pass Filter. In multi-radio contesting situations with mono-band operations, band pass filters can be used to specifically limit the RF band pass to a single amateur band—eliminating image and harmonic RF interference. Used with a transmit multiplexer, these passive filters provide additional isolation that enables multiple transceivers to be operated on different bands simultaneously on the same antenna. Use of a multiplexer duplexers to pentaplexers are available from Low Band Systems spares operators time and installation hassles as well as the cost of buying extra antennas and coax cable. The 1, and 2, watt versions are available with cooling fans. The units provide:. You must be logged in to post a comment.
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W3NQN Design Filters

Forgot Password? An RF filter is an electrical circuit configuration network designed to have specific characteristics with respect to the transmission or attenuation of various frequencies that may be applied to it. This filter can give you that extra boost. Its primary application is reducing interference between HF stations operating in close proximity. May QST pp.
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The performance of these W3NQN design filters, regardless of who assembles them is the same. We will fill your order using the filters we have on hand when you place your order. K7MI's filters are those that have been used in our FilterMax units for years and we are now also shipping them in single band packaging. If you are planning a DXpedition or a contest expedition where you will need these filters, please order in advance and let us know when you actually need to have them in your possession. We will work with you to meet your schedule.
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