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RF Filters
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- Tunekit
- Filter Tuning Kit for Windows is a electronic filter synthesis program and a practical filter tuning aid for actually designing and building a working filter
- TVI and BCI Filters
- TVI and BCI bandpass and bandstop filters in SMD technique. Schematics and images.
- Using ferrite for interference suppression
- Excellent guide to using ferrite cores for interference suppression.
Understanding and Solving RF Interference and Noise Problems by Jim Brown K9YC Audio Systems Group, Inc. PDF File
- A low pass filter circuit
- A simple 7 element, Chebyshev low pass filter, rolls of at 30MHz. Attenuation is better than -40dB at 60MHz, -65dB at 90MHz, -80dB at 120MHz.
- Band Filters
- Experience of band filters, for a contest multi operator enviroenment
- A cheap noise reducing speaker
- Noise Reduction on the Cheap PDF File
- Band-Pass Filters for HF Transceivers
- Do your multiple-transmitter field day or contest efforts suffer from intrastation interference ?
- 1.8-54 Mhz Low pass filter
- An easy to make HF low pass filter form high power by k8cu
- K2TR Coax Stub Filters
- Multi transmitter filters
- Clean Up Your Signals with Band-Pass Filters
- These inexpensive, easily built filters can be the buffer you need between the signals you want to hear and send and those you dont!
- KI5YN QLF Filter
- The QLF filter is a microprocessor based interface designed to go between a standard Morse code key and a radio transmitter
Alphabetical
- Interactive Digital Filter Design
- This is an interactive filter design package, for designing digital filters
[Hits: 505 | Votes: 3 | Rate: 6.67] - 1.5KW 6m Low Pass Filter
- This filter is designed to follow a FULL legal limit, GS-35B, 6m linear amplifier. Designed and built by Bill Jones, K8CU
[Hits: 389 | Votes: 2 | Rate: 10.00] - 1.8-54 Mhz Low pass filter
- An easy to make HF low pass filter form high power by k8cu
[Hits: 2041 | Votes: 0 | Rate: 0.00] - 500 KHz Low Pass Filter
- This article describes a shielded low pass filter with a cut off frequency of about 500 KHz. It is built with components suitable for receiving, and was designed to use in front of a low frequency receiver for LOWFER work.
[Hits: 595 | Votes: 3 | Rate: 4.00] - 5th order High Pass VHF Filter
- Sometimes many VHF-UHF modern transceivers have problems with BROADCAST Interference and CROSS-modulation from FM commercial broadcast stations this article shows a simple Batteworth HI-Pass VHF Filter to reduce this problem
[Hits: 655 | Votes: 6 | Rate: 6.00] - A cheap noise reducing speaker
- Noise Reduction on the Cheap PDF File
[Hits: 2459 | Votes: 2 | Rate: 1.50] - A diode-switched band-pass filter
- High speed silicn diodes work well as RF switches. This article describes how to use diodes for selecting two or more filters ARRL QST article by W1FB
[Hits: 867 | Votes: 1 | Rate: 10.00] - A low pass filter circuit
- A simple 7 element, Chebyshev low pass filter, rolls of at 30MHz. Attenuation is better than -40dB at 60MHz, -65dB at 90MHz, -80dB at 120MHz.
[Hits: 2832 | Votes: 7 | Rate: 6.85] - Audio CW Filter
- A very effective AF Adaptor, with built-in noise blanker and 30 Hz CW filter modules by PA0LQ
[Hits: 589 | Votes: 2 | Rate: 4.00] - Band Filters
- Experience of band filters, for a contest multi operator enviroenment
[Hits: 2786 | Votes: 4 | Rate: 7.75] - Band-Pass Filters for HF Transceivers
- Do your multiple-transmitter field day or contest efforts suffer from intrastation interference ?
[Hits: 2099 | Votes: 2 | Rate: 9.00] - Bandpass and I.F. Filters
- On this page a popcorn highpass filter, some inductors and their Q , double tuned bandpass filters and simple Cohn Crystal ladder IF filters are presented.
[Hits: 513 | Votes: 0 | Rate: 0.00] - Clean Up Your Signals with Band-Pass Filters
- These inexpensive, easily built filters can be the buffer you need between the signals you want to hear and send and those you dont!
[Hits: 1717 | Votes: 0 | Rate: 0.00] - Clean Up Your Signals with Band-Pass Filters part 2
- Part 2Youre now much closer to saying
goodbye to your unwanted signal problems!
[Hits: 757 | Votes: 0 | Rate: 0.00] - Coaxial Stub Filters
- Coaxial stub filters used at W7GJ
[Hits: 572 | Votes: 0 | Rate: 0.00] - Coaxial Stub Filters
- A range of easy-to-build RFI filters
by John Regnault, G4SWX
[Hits: 741 | Votes: 2 | Rate: 8.50] - Design RF Filter
[Hits: 796 | Votes: 1 | Rate: 5.00] - Easy bandpass filters
- Quick and easy bandpass filters for receiver input
by George Dobbs G3RJV
[Hits: 964 | Votes: 0 | Rate: 0.00] - Filtering of the Icom IC-775 DSP
- Replacing filters on ICOM IC 775
[Hits: 82 | Votes: 0 | Rate: 0.00] - Filters and Ferrites in EMC
- This article is about the characteristics and use of various filters and ferrites for solving amateur radio electromagnetic compatibility problems involving breakthrough of amateur signals into domestic equipment such as television sets, video recorders stereo sytems etc.
[Hits: 559 | Votes: 0 | Rate: 0.00] - Filters for NDB reception
- RF Filters to help with NDB reception problems
[Hits: 856 | Votes: 1 | Rate: 10.00] - High Pass Filters
- Understand how high pass filters are done
[Hits: 331 | Votes: 0 | Rate: 0.00] - High-Pass Filter Design
- Online high pass filter design page with introduction to high-pass filters by K7MEM
[Hits: 340 | Votes: 1 | Rate: 1.00] - Homebrew a CW Filter
- An home-brewed morse code CW filter with a central frequency of 800hz and a variable bandwidth from 230hz to 26hz by F5RDH in french.
[Hits: 908 | Votes: 1 | Rate: 4.00] - Inrad Roofing Filter in the Yaesu FT-920
- Insalling Inrad roofing filter in the FT-920 with pictures and comments
[Hits: 394 | Votes: 2 | Rate: 9.50] - Interdigital bandpass filter designer
- Fill out the form to design a bandpass filter as described in the January 1985 issue of Ham Radio Magazine. These filters are generally limited to frequencies above 200 MHZ because their size is slightly longer than 1/4 wavelength
[Hits: 537 | Votes: 3 | Rate: 7.00] - Interferences and filtering
- General information on Filter passbands, interferences, TVI and RFI problems
[Hits: 836 | Votes: 1 | Rate: 10.00] - K2TR Coax Stub Filters
- Multi transmitter filters
[Hits: 2008 | Votes: 4 | Rate: 6.75] - K3NA stub design
[Hits: 355 | Votes: 0 | Rate: 0.00] - KI5YN QLF Filter
- The QLF filter is a microprocessor based interface designed to go between a standard Morse code key and a radio transmitter
[Hits: 1455 | Votes: 3 | Rate: 4.67] - LC Filter Design
- This is an interactive design package for designing analogue (i.e. hardware) filters made of inductors and capacitors (Ls and Cs).
[Hits: 815 | Votes: 4 | Rate: 6.75] - Low Pass Audio Filter
- 440 Hertz peaked low pass audio filter experiments
[Hits: 426 | Votes: 1 | Rate: 7.00] - Low Pass Filter Construction
- Low Pass Filter Module Construction Manual
[Hits: 543 | Votes: 0 | Rate: 0.00] - Low Pass Filters
- Article explaining electronic network of low pass filters
[Hits: 499 | Votes: 0 | Rate: 0.00] - Low-Pass Active Filter Designer
- Javascript filter design page with introduction to low pass filters by k7mem
[Hits: 283 | Votes: 0 | Rate: 0.00] - Lowpass filter for 5MHz
- The following lowpass filter was built using the tables in the arrl manual, it is a 5 section one and seems to work ok
[Hits: 63 | Votes: 0 | Rate: 0.00] - Mode J Desense Filter
- This type of filter can be used in a Mode J satellite station (uplink on 2m, downlink on 70cm) to reduce the problem of the uplink signal desensing the receiver
[Hits: 793 | Votes: 2 | Rate: 5.00] - Narrow Band-Pass filter for HF
- Band-pass filters can be critical components in
competitive stations. This setup may help
put your station on the map.
[Hits: 1067 | Votes: 0 | Rate: 0.00] - Novel filter for sat working
- Elimiate QRM when working with satellite antennas
[Hits: 179 | Votes: 0 | Rate: 0.00] - Online Microwave Filter Design and Analysis
- This site is dedicated to design and analysis of micro- and millimeter wave filters from 0.5 to above 100 GHz.
[Hits: 370 | Votes: 7 | Rate: 7.71] - Passive CW headphone filter
- This filter is a plug in adapter that has no batteries but gives very good performance by G8MNY
[Hits: 479 | Votes: 0 | Rate: 0.00] - Power netfilter
- Homebrew a Power netfilter
[Hits: 89 | Votes: 0 | Rate: 0.00] - Receiver Band-Pass Filters
- Third-order Cauer filters can boost performance of
multi-transmitter, multi-operator contest stations to the next level. The filters are practical and you
dont need expensive test equipment to align them.
[Hits: 381 | Votes: 0 | Rate: 0.00] - Second-Harmonic-Optimized Low-Pass Filters
- Sometimes we need a little more output filtering than traditional designs offer. Look at a new filter that can give you that extra boost. QST article by W3NQN
[Hits: 402 | Votes: 0 | Rate: 0.00] - SSB and CW Filter
- A pdf file with schematics of an ssb and cw filter AF amplifier
[Hits: 915 | Votes: 1 | Rate: 7.00] - Stub HF filter
- Multi transmitter filters for HF Bands
[Hits: 228 | Votes: 0 | Rate: 0.00] - The Ladder Filter
- Article by Lloyd Butler VK5BR
[Hits: 523 | Votes: 2 | Rate: 8.50] - The NVARC Ugly Filter Project
- Project to build sets of band pass transmitting filters for reducing the interference between HF transceivers operated in close proximity
[Hits: 617 | Votes: 3 | Rate: 9.33] - Tunekit
- Filter Tuning Kit for Windows is a electronic filter synthesis program and a practical filter tuning aid for actually designing and building a working filter
[Hits: 3681 | Votes: 8 | Rate: 5.38] - TVI and BCI Filters
- TVI and BCI bandpass and bandstop filters in SMD technique. Schematics and images.
[Hits: 3390 | Votes: 4 | Rate: 5.00] - TVi Basics - making filters
- TV Interference filters, making TVI filters, coaxial filters to eliminate TV interferences caused by radio frequency
[Hits: 621 | Votes: 0 | Rate: 0.00] - UHF Reject filter
- This filter is a 0.1 dB Tschebychev lowpass with a rejection of 90 dB
or better at 430 MHz, and 0.2 dB insertion loss at 72 MHz.
[Hits: 847 | Votes: 1 | Rate: 10.00] - Using Band-Pass Filters
- Clean Up Your Signals with Band-Pass Filters
[Hits: 337 | Votes: 0 | Rate: 0.00] - Using ferrite for interference suppression
- Excellent guide to using ferrite cores for interference suppression.
Understanding and Solving RF Interference and Noise Problems by Jim Brown K9YC Audio Systems Group, Inc. PDF File
[Hits: 2937 | Votes: 6 | Rate: 9.50] - Variable bandwidth cw filter
- As the sunspots return and DX propagation conditions to improve, the age old problem with QRM begins to show up on the amateur bands. Thif filter help you on improving reception
[Hits: 758 | Votes: 3 | Rate: 4.33] - VHF Broadcast Passband Filter
- VHF Broadcast Passband Filter (88 108 MHz) by DF9CY
[Hits: 224 | Votes: 0 | Rate: 0.00] - W3LPL Receiving Bandpass Filters
- Project of receive only filters optimized for minimal loss and very high rejection of frequencies below 75% of the filter center frequency by K1TTT
[Hits: 528 | Votes: 0 | Rate: 0.00] - W3NQN BPF Project
- W3NQN Multiband Transmitting BPF Project
[Hits: 443 | Votes: 0 | Rate: 0.00] - YCCC 6 Band Receive Bandpass filter
- This is a 6 band receive only filter designed to protect your receiver front end and provide 45dB reject at the stop bands.
[Hits: 938 | Votes: 2 | Rate: 9.50]
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