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1.8 to 54 MHz Low Pass Filter

Works on all amateur bands from 1.8 MHz through 54 MHz

5th order High Pass VHF Filter, SV1BSX

Sometimes many VHF-UHF modern tranceivers have problems

5 bands remote switchable BPF, ON7EQ

The performances of this band filter are very comparable

50 MHZ low pass filter, W7GJ

Design and performance of a QRO low pass filter for 50 MHz

70Mc/s Low Pass Filter, PA3CSG

The filter published there is working without problem and needs no or very little tuning

70 MHz Low Pass filter

with my original 4m tranverter system which had a decent pa i needed a lpf low pass filter on the output

A cheap noise reducing speaker

Spike noise is a high frequency pulse that rides

A 50MHz High Pass TVI Filter

designed to be placed in the 75 Ohm coax

A home-built low-pass filter for 4m

To suppress unwanted harmonics, it is recommended to use an extra low-pass filter LPF with a 4-meter transmitter

A diode-switched band-pass filter

expensive than working with mechanical switch

A low pass filter circuit

There are applications where a particular band, or spread

An L/C audio bandpass filter, K7OEI

response to obtain the goal of a reasonable 300-2400 Hz filter

Audio Filter and Speakers

Passive audio filters have been around for many years,If your receiver didn't have a CW filter, this little jewel worked fairly well

Band Filters

Band pass filter circuit & transfer function active & passive

Band-Pass Filters for HF Transceivers

band phase noise interference is not usually

Clean Up Your Signals with Band-Pass Filters

10 meter filter, all the other filters are housed

Clean Up Your Signals with Band-Pass Filters

An inside view of 160 meter and 10 meter BPF

Crystal band pass filters for QRSS applications, M0AYF

The very narrow bandwidths associated with crystal filters does not pose a problem for qrss

Coaxial Stub Filters, G3SEK

You should not need to use a narrowband filter after a transmitter

Coax Stub Filters

This calculator is suiteable to calculate the length of a piece of coaxial cable to produce a notch at a desired frequency

Configurando filtros con un generador de ruido, LU1AR

El circuito de este generador de ruido lo bajé de la webv

Design a custom Interdigital Bandpass Filter

Fill out the form below to design a bandpass filter as described

Design RF Filter

Design a third order low-pass Chebyshev filter with a cutoff frequency

Easy bandpass filters

A series of Bandpass Filters designed for the input tuning

Filtro Passa Basso anti TVI per HF

progettare e realizzare un filtro passa basso per applicazione TVI

Filtro per l'ascolto in LF, IZ2DAY

serve per attenuare i segnali al di sopra dei 450 KHZ

Filters and Ferrites in EMC

varius filters and ferrites for solving amateur radio EMC

Filtres 144Mhz et 50 Mhz

EME traffic for example requires a radiated power

Filtro da rete per apparati, IK0RKS

Essendo rimasto lusingato dai risultati del filtro direte sull’alimentatore per gli apparati a 12 volt

Filtro ascolto LF ,IZ2DAY

Questo filtro si interpone tra voltmetro selettivo o un qualsiasi ricevitore e antenna

Filtro antidisturbo RFI per alimentatori switching PC, I6IBE

Questi filtri erano montati di serie all'interno di TUTTI gli alimentatori per Personal Computer

How to make a coax notch or bandpass filter, DL4XAV

both stubs are 1/4 lambda the line between the stubs is 1/4 lambda

High-Pass Filter Design

A high-pass filter's task is just the opposite of a low-pass filter

High Power Lowpass Filter for 145 MHz, DJ9KW

build a low-pass filter for 145 MHz as required after power amplifiers

HF band pass filter, ON7EQ

For a 5 band filter I used following parts out of my junk box

Homebrew narrow CW filter, IK1ZYW

Besides the same performance of YF-122C, it feature

Home Brew CW Filter

If your receiver's audio passband bandwidth is too wide and other nearby signals you need a cw filter

Interferences and filtering

interference can be used to select a narrow frequency

Junk Box NDB Low Pass Filter

With winter approaching, many HAM and SWL hobbyists find intrigue in tuning in NDB

LC band pass filter circuit

Like many people, I have a general coverage receiver

Low Pass Filter Construction

remove the insulation from the wire at the base of the core as shown

Mode J Desense Filter

This type of filter can be used in a Mode J satellite station

Noise suppression with X-phase II, DL0HST

QRM eliminator, of radio interference

Narrow Band-Pass filter for HF

Comparisons between Chebyshev and Butterworth filters

Online Microwave Filter Design and Analysis

This site is dedicated to design and analysis of micro- and millimeter

Passive Low Pass Filter

Basically, an electrical filter is a circuit that can be designed to modify

PCB low pass filters , PA3CSG

Describes an simple low pass filter, according to his finding suitable for 2 kW power

Projects Cw Filters

This circuit may be used to eliminate an unwanted carrier when trying to copy weak stations

QLF Filter, KI5YN

The QLF filter is a microprocessor based interface designed to go between

QRM Eleminator,DC2WK

Have some times problems with local noise on the lower bands.view this project QRM Eliminator

Receiver Band-Pass Filters

attenuating the phase noise and harmonics of the typical

Realization of an anti-TVI filter

suitable spectral purity of the order of -60 dB

Receiving Bandpass Filters, W3LPL

Attenuation 160-15m filters 70db rejection of other bands. 10m filte

Second-Harmonic-Optimized Low-Pass Filters

the FCC requires transmitter spurious output

Some Simple Strategies for Phone RFI, W1AEX

1000 watts on 160 and 75 meters that my telephones were susceptible to fairly significant RFI problems

Simple band pass filter for 23cm

a 3-pole and a 5-pole, which one you use depends on how selective you want the filter to be, and the insertion loss to be tolerated

The Ladder Filter

In home-brewing a single sideband (SSB) transmitter, an essential

The NVARC Ugly Filter Project

First, this is not a construction article. This article describes

TVI Stop filter

What to do, if your neighbour comes banging at your door just in that moment you want work the DX of the year

TVI and BCI Filters

Therefore we, ham radio operators, should stop TVI etc

TVI filters, LA8AK

low-pass filters in which the unwanted high-frequenc

Using Band-Pass Filters

The cut-off frequency or ƒc point in a simple RC passive filter can be accurately

Un semplice filtro anti TVI, IW2FND

per eliminare i disturbi di modo comune captati dal cavo coassiale

Using ferrite for interference suppression

One of the most used yet least understood techniques

Variable RF Signal Sampler

RF power into the sample port

VHF Broadcast Passband Filter, DF9CY

In some cases the input filter of a VHF Broadcast receiver for 87.5 - 108 MHz

YCCC 6 Band Receive Bandpass filter

This is a 6-band receive only filter designed to protect your receiver

TVI filters, VK3NX

The attenuation in the 2m band was >80dB

XPhase Interference reduction,DL2SBA

The function of the XPhase is based on the fact that the interfering signal

Calculator Filter
Interferences and filtering
Design a custom Interdigital Bandpass Filter

Modif. April 30 2024

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