- Interactive Digital Filter Design
- This is an interactive filter design package, for designing digital filters
[ Hits: 973 | Votes: 3 | Rating: 6.67 ]
- 144MHz Low-Pass / 432 MHz Notch Filter
- A combined 144MHz Low-Pass and 432 MHz Notch Filter by VE2ZAZ
[ Hits: 713 | Votes: 3 | Rating: 1.33 ]
- 20m 30m 40m Bandpass Filters
- Homemade LC Bandpass Filters for 20M, 30M, 40M In multi-station environments like special events, field day, portable operating, is very important to protect receivers from excessively strong signals. Bandpass filters help to protect your transceivers.
[ Hits: 322 | Votes: 1 | Rating: 10 ]
- 23 cm filters
- 2 filter designs a 3-pole and a 5-pole
[ Hits: 423 | Votes: 1 | Rating: 1 ]
- 30 Meter Band Pass Filter
- A homemade band pass filter for the 30 meter band based on the original VE7BPO design
[ Hits: 572 | Votes: 1 | Rating: 6 ]
- 432 144 MHz Notch Filter
- Combined 432 MHz High-Pass - 144 MHz Notch Filter By Bertrand Zauhar, VE2ZAZ
[ Hits: 502 | Votes: 1 | Rating: 1 ]
- 440Mhz Interdigital Bandpass Filter
- Homebrew Amateur Radio 440Mhz Interdigital Bandpass Filter
[ Hits: 574 | Votes: 1 | Rating: 1 ]
- 50 MHz Terminating Low Pass Filter
- This low pass filter terminates all harmonics from the 2nd to above the 10th harmonic in a better than 15 db return loss load
[ Hits: 535 | Votes: 0 | Rating: 0 ]
- 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: 1198 | Votes: 8 | Rating: 6.12 ]
- 70 MHz low pass filter
- An home made low pass filter for 70 MHz by IK0VAQ
[ Hits: 713 | Votes: 3 | Rating: 4.67 ]
- A 2 meter band-pass cavity using surplus Heliax
new
- Cavity is often required at a busy site to not only prevent its receiver from being overloaded by off-frequency signals, but also be a good neighbour and prevent low-level signals from your transmitter from getting into other users receivers - not to mention the preventing of those other signal from getting back into your transmitter to generate spurious signals in its own right.
[ Hits: 87 | Votes: 2 | Rating: 3 ]
- A compact 5 bands remote switchable BPF
- These band filters are based on 3 or 5 sections Butterworth band pass filters, maintaining 50 Ohm impedance, and when built around toroidal inductors, can be made very compact.
[ Hits: 213 | Votes: 0 | Rating: 0 ]
- 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: 2272 | Votes: 2 | Rating: 5.5 ]
- A home-built low-pass filter for 4m
- This unit uses four capacitors, only two of which are variables, and a single tapped coil. It is built in a die-cast box, and has been tested up to 80W input power on 70MHz by G4CJZ
[ Hits: 573 | Votes: 0 | Rating: 0 ]
- 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: 5300 | Votes: 21 | Rating: 6.1 ]
- About Cavity Filters
- Cavity filters are tipically circuitry behind a duplexer that allow only certain frequencies to pass
[ Hits: 467 | Votes: 3 | Rating: 5.33 ]
- Audio CW Filter
- A very effective AF Adaptor, with built-in noise blanker and 30 Hz CW filter modules by PA0LQ
[ Hits: 1499 | Votes: 3 | Rating: 5.67 ]
- Audio CW Filter
- An home madek Audio CW Filter made simply using SMD Components
[ Hits: 161 | Votes: 0 | Rating: 0 ]
- Band Filters
- Experience of band filters, for a contest multi operator enviroenment
[ Hits: 4044 | Votes: 6 | Rating: 7.5 ]
- Band filters by PA9M
- Band filters for PA6Z made by PA9M, designed by W3NQN.
[ Hits: 470 | Votes: 1 | Rating: 9 ]
- Band Pass Filters for HF Transceivers
- If your multiple transceiver station is suffering of intrastation interference, this handy and inexpensive band pass filters and help you. QST article Sept 1988
[ Hits: 121 | Votes: 0 | Rating: 0 ]
- Band-Pass Filters for HF Transceivers
- Do your multiple-transmitter field day or contest efforts suffer from intrastation interference ?
[ Hits: 4278 | Votes: 3 | Rating: 6.33 ]
- Band-stop filter
- Wikipedia page on Notch filter, a narrow stopband - high Q factor filter
[ Hits: 439 | Votes: 2 | Rating: 2.5 ]
- 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: 890 | Votes: 0 | Rating: 0 ]
- Bandpass filter
- A simple project for an effective home made band pass filter, designed for the portable field day usage
[ Hits: 761 | Votes: 2 | Rating: 9 ]
- Bandpass filters design
- How to design narrowband bandpass filters
[ Hits: 803 | Votes: 4 | Rating: 2 ]
- Bandpass Filters for Portable Usage
- These are QRP rated 3 Pole Butterworth filters based on a design by K4VX, feature simplicity, almost no insertion loss, and reasonable rejection on the other ham bands.
[ Hits: 530 | Votes: 0 | Rating: 0 ]
- Cheap Crystal Filter
- An economical way of building an SSB filter. The circuit is for a filter with a 6 DB band width of roughly 2.2 KHz.
[ Hits: 493 | Votes: 0 | Rating: 0 ]
- 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 don't!
[ Hits: 3568 | Votes: 0 | Rating: 0 ]
- Clean Up Your Signals with Band-Pass Filters part 2
- Part 2 You're now much closer to saying
goodbye to your unwanted signal problems!
[ Hits: 1343 | Votes: 0 | Rating: 0 ]
- Coaxial Stub Filters
- Coaxial stub filters used at W7GJ
[ Hits: 1130 | Votes: 0 | Rating: 0 ]
- Coaxial Stub Filters
- A range of easy-to-build RFI filters
by John Regnault, G4SWX
[ Hits: 1321 | Votes: 4 | Rating: 9.25 ]
- Constant k Lowpass Filter Design
- Online Constant - k Lowpass Filter calculator
[ Hits: 446 | Votes: 12 | Rating: 3.67 ]
- Contest Bandpass Filters
- Build a set of W3NQN filters for multi-operator contesting
[ Hits: 647 | Votes: 0 | Rating: 0 ]
- Curing Alternator Whine
- How to create a low pass filter able to reduce or even remove the noise generated from your car or truck alternator
[ Hits: 513 | Votes: 2 | Rating: 9 ]
- CW Notch Filter
- Homebrew CW notch filter project by KN9B
[ Hits: 516 | Votes: 0 | Rating: 0 ]
- Design RF Filter
[ Hits: 1516 | Votes: 2 | Rating: 4.5 ]
- Filtering of the Icom IC-775 DSP
- Replacing filters on ICOM IC 775
[ Hits: 513 | Votes: 5 | Rating: 6.4 ]
- 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: 900 | Votes: 0 | Rating: 0 ]
- High Pass Filters
- Understand how high pass filters are done
[ Hits: 602 | Votes: 0 | Rating: 0 ]
- High-Pass Filter Design
- Online high pass filter design page with introduction to high-pass filters by K7MEM
[ Hits: 659 | Votes: 2 | Rating: 1 ]
- Highpass filter calculator
- Butterworth Highpass Filter Designer
[ Hits: 440 | Votes: 4 | Rating: 2.75 ]
- 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: 1755 | Votes: 2 | Rating: 2.5 ]
- Homebrew Crystal Filter Design
- Desgining crystal filters and find out crystal data by measuring it.
[ Hits: 682 | Votes: 7 | Rating: 7 ]
- How to make a mains filter for EMC and noise reduction
- Article showing how I've made a mains filter to reduce EMC in the electricity supplying my shack. I've used a type 31 Fair-Rite ferrite core and the video shows how this performs on 160m through to 40m.
[ Hits: 1192 | Votes: 5 | Rating: 9.6 ]
- ICOM IC-775 FIlter Installation
- Inrad Roofing Filter installation instruction, The IC-775 Roofing Filter Mod consists of a 6 pole, 5 kHz wide filter followed by a high dynamic range, feedback amplifier.
[ Hits: 55 | Votes: 0 | Rating: 0 ]
- Inrad Roofing Filter in the Yaesu FT-920
- Insalling Inrad roofing filter in the FT-920 with pictures and comments
[ Hits: 798 | Votes: 2 | Rating: 9.5 ]
- 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: 1101 | Votes: 6 | Rating: 7.67 ]
- Interferences and filtering
- General information on Filter passbands, interferences, TVI and RFI problems
[ Hits: 1167 | Votes: 1 | Rating: 10 ]
- K2TR Coax Stub Filters
- Multi transmitter filters
[ Hits: 3211 | Votes: 7 | Rating: 6.43 ]
- 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: 1936 | Votes: 3 | Rating: 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: 1553 | Votes: 4 | Rating: 6.75 ]
- Low Pass Audio Filter
- 440 Hertz peaked low pass audio filter experiments
[ Hits: 914 | Votes: 1 | Rating: 7 ]
- Low Pass Filters
- Article explaining electronic network of low pass filters
[ Hits: 812 | Votes: 0 | Rating: 0 ]
- Low-Pass Active Filter Designer
- Javascript filter design page with introduction to low pass filters by k7mem
[ Hits: 601 | Votes: 1 | Rating: 1 ]
- Lowpass filter for 30m
- 30m lowpass filter for the Softrock Ensemble RXTX tranceiver.
[ Hits: 348 | Votes: 0 | Rating: 0 ]
- Mains Filter for EMC & Noise Reduction
- This article shows how to make a mains filter that can be extremely effective in reducing and in some cases eliminating completely EMC from the electricity supplying your shack
[ Hits: 292 | Votes: 3 | Rating: 3.67 ]
- 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: 1150 | Votes: 2 | Rating: 5 ]
- 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: 2487 | Votes: 1 | Rating: 1 ]
- Noise Bridge Tuner Tuner
- Noise bridge circuit to tune your tuner
[ Hits: 362 | Votes: 1 | Rating: 10 ]
- Notch Filter Designer
- Online calculator, Butterworth Bandstop (Notch) Filter Designer
[ Hits: 803 | Votes: 6 | Rating: 3.33 ]
- Novel filter for sat working
- Elimiate QRM when working with satellite antennas
[ Hits: 476 | Votes: 0 | Rating: 0 ]
- Online Microwave Filter Design and Analysis
updated
- This site is dedicated to design and analysis of micro- and millimeter wave filters from 0.5 to above 100 GHz.
[ Hits: 635 | Votes: 10 | Rating: 6.2 ]
- PC Board Filters
- Offer performance comparable to tin-box filters, and except for being bigger, stack up pretty well with those expensive little helical jobs. You just have to be able to make your own PC boards.
[ Hits: 375 | Votes: 0 | Rating: 0 ]
- Power netfilter
- Homebrew a Power netfilter
[ Hits: 335 | Votes: 0 | Rating: 0 ]
- 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
don’t need expensive test equipment to align them.
[ Hits: 873 | Votes: 1 | Rating: 5 ]
- RF filter basics tutorial
- an overview, introduction or tutorial about the basics of electronics filters including the types of filter and the various filter design considerations and parameters
[ Hits: 294 | Votes: 0 | Rating: 0 ]
- Roofing Filters
- An Introduction to Roofing Filters by ACØC
[ Hits: 500 | Votes: 0 | Rating: 0 ]
- RTLSDR Coax Stub
- Cutting out the noise using a simple coax filter to improve the poor front end filtering
[ Hits: 745 | Votes: 2 | Rating: 5.5 ]
- 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: 869 | Votes: 0 | Rating: 0 ]
- SSB and CW Filter
- A pdf file with schematics of an ssb and cw filter AF amplifier
[ Hits: 2107 | Votes: 3 | Rating: 4.33 ]
- Stub HF filter
- Multi transmitter filters for HF Bands
[ Hits: 533 | Votes: 0 | Rating: 0 ]
- The Ladder Filter
- Article by Lloyd Butler VK5BR
[ Hits: 811 | Votes: 2 | Rating: 8.5 ]
- 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: 1032 | Votes: 4 | Rating: 9.5 ]
- Tunable BandPass Filter
- A homemade tunable bandpass filter for all HF bands from 160m to 10m
[ Hits: 1087 | Votes: 3 | Rating: 5.67 ]
- 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: 4824 | Votes: 9 | Rating: 4.89 ]
- TVI Filter schematic
- A simple TVI Filter schematic
[ Hits: 411 | Votes: 0 | Rating: 0 ]
- Use Band Pass Filters to clean up Signals
- Clean Up Your Signals with Band-Pass Filters, a two-parts article published in this PDF file from a June 1998 QST article
[ Hits: 769 | Votes: 1 | Rating: 1 ]
- Using Band-Pass Filters
- Clean Up Your Signals with Band-Pass Filters
[ Hits: 719 | Votes: 0 | Rating: 0 ]
- 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: 6097 | Votes: 6 | Rating: 9.5 ]
- 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: 1148 | Votes: 3 | Rating: 4.33 ]
- VHF Broadcast Passband Filter
- VHF Broadcast Passband Filter (88 108 MHz) by DF9CY
[ Hits: 595 | Votes: 1 | Rating: 1 ]
- 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: 1066 | Votes: 0 | Rating: 0 ]
- W3NQN TX filters
- Building the W3NQN bandpass filters
[ Hits: 413 | Votes: 0 | Rating: 0 ]
- 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: 1915 | Votes: 2 | Rating: 9.5 ]
