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• Coax Stubs for 20m and 40m - When operating contest in a multi transceiver environment interferences between the 40m and 20m are guaranteed. An easy and inexpensive way to reduce interferences is to add coax stub filters
  [ Hits: 243 | Votes: 4 | Rating: 8.5 ]
• Coax Notch Traps - Attenuating adjacent bands - Targeted Attenuation for Adjacent Bands. Filtering is needed between the two rigs to prevent physical damage to the RX front end and to prevent the kinds of high-signal overload conditions like desense and IMD - as well as containing harmonic energy.
  [ Hits: 134 | Votes: 0 | Rating: 0 ]
• The Quarter-wave stub - The Quarter-wave stub can be used for many purposes. If it is left with an open end it can be used as a notch filter to attenuate certain frequencies. A quarter wave length of a transmission line can also be used as an impedance transformer, to know more about the Quarter-wave impedance transformer
  [ Hits: 136 | Votes: 1 | Rating: 8 ]

• DXCenter DX Cluster - Online world map with live updates from the DX Cluster network, displaying new spots on the maps as they appear. Filtering options are available including bands, source continent and dx continent.
  [ Hits: 353 | Votes: 2 | Rating: 5.5 ]
• URE WebCluster - Online DX Cluster provided by URE Union Radioafocionados Espanoles Provide current band status, propagation map, solar indices and dx spots with several filtering functions
  [ Hits: 59 | Votes: 0 | Rating: 0 ]

• N3TUQ DX Maps - DX Cluster spots represented in a google map, for 10m 6m 2m bands taken from the VE7CC DX Cluster. Some filtering options are available.
  [ Hits: 112 | Votes: 0 | Rating: 0 ]

• World of Receivers and Transmitters - A searchable database of online websdr receivers, lists OpenWebRX, KiWi SDR and WebSDR from all over the world, providing a web interface to search and filter links to websdr
  [ Hits: 307 | Votes: 3 | Rating: 4 ]

• VA6AM Contesting Accessories - Custom built high and low power power band pass Filters, low band triplexers, triplexers and diplexers
  [ Hits: 119 | Votes: 0 | Rating: 0 ]

• FT2000 Roofing Filter Installation - A step by step guide to install the NS Roofing filter into the Yaesu FT-2000
  [ Hits: 110 | Votes: 0 | Rating: 0 ]

• Yaesu FT 857 Filters Repair - Replacing two ceramin filters of a Yaesu FT-857 by desoldering and soldering new ones.
  [ Hits: 98 | Votes: 0 | Rating: 0 ]

• WinRFCalc Free Windows RF Calculator - A multi tool Windows program that has been designed to offer the EMC RF and Radio Engineer a large variety of tools for Attenuation calculation, VSWR analysis, FIR Filter calculations, EMC system configuration, Radar testing , RF Filter calculation and much more without the need of a live internet connection.
  [ Hits: 211 | Votes: 0 | Rating: 0 ]

• A switched Capacitor Audio Filter - Here is a rather nice audio filter for use with Ham Radio gear. It features switchable operation as a -32 dB per octave low pass or notch filter having a 200Hz-2500Hz tunable cutoff frequency, buffered input and output, switch selectable filter bypass function, and good stability. T
  [ Hits: 72 | Votes: 0 | Rating: 0 ]

• Bandpass Filter Calculator - Passive Bandpass Filter online calculator and filter formulas. Active Inverting Op Amp Bandpass Filters, Active Noninverting Op Amp Bandpass Filter, just enter the Low ir High Cutoff Frequency
  [ Hits: 166 | Votes: 3 | Rating: 5.33 ]

• Audio CW Filter - An home madek Audio CW Filter made simply using SMD Components
  [ Hits: 173 | Votes: 0 | Rating: 0 ]
• 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: 61 | Votes: 0 | Rating: 0 ]
• 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: 383 | Votes: 1 | Rating: 10 ]
• 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: 128 | Votes: 0 | Rating: 0 ]
• 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: 223 | Votes: 0 | Rating: 0 ]

• 17 meter QRP Transmitter - 1-watt 17-meter cw transmitter that was originally done about 10 years ago as a club project for RAMS, the Radio Amateur Megacycle Society. It uses a VXO, rather novel at the time. It also uses a bandpass filter at the output rather than the usual lowpass
  [ Hits: 122 | Votes: 0 | Rating: 0 ]

• A Simple Spectrum Analyzer - This is a swept-filter spectrum analyzer. Basically, RF and swept oscillator signals are fed to a mixer and the output of the mixer is passed through a highly selective crystal filter.
  [ Hits: 121 | Votes: 0 | Rating: 0 ]

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