rc filter

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rc filter

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Antennas : Feed Lines : Coax Stubs
  • 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: 134 | Votes: 1 | Rating: 8 ]
Antennas : Tuners
  • Semi-automatic antenna tuner project - Thsi article describes a microcontroller driven semi-automatic antenna tuner capable of handling power levels up to 150 watts. The device is a low pass filter tuner manually tuned by setting the optimized L/C combination by hand and then storing the values into the EEPROM of the mictrocontroller to recall them later (seperately for each band from 80 to 10 meters including WARC bands)
    [ Hits: 291 | Votes: 0 | Rating: 0 ]
DX Resources : Clusters
  • 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: 350 | Votes: 2 | Rating: 5.5 ]
Internet and Radio : Classifieds
  • HamFM Classifieds - 100% free eBay like classified listings for any ham radio operator. Search filters for distance and item category.
    [ Hits: 179 | Votes: 0 | Rating: 0 ]
Internet and Radio : Directories
  • 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: 304 | Votes: 3 | Rating: 4 ]
Manufacturers : Filters
  • Anatech Electronics - Anatech Electronics manufactures RF filters for communication systems, Military and commercial, as well as RF filters for Wireless applications. Products include, Band pass filters, Duplexers, Low pass, high pass and bandstop filters. Additional products such as RF cable assembly also available.
    [ Hits: 281 | Votes: 1 | Rating: 10 ]
Radio Equipment : HF Transceivers : Icom IC-703
  • Icom IC703 10W Transceiver - The IC703 features a built-in DSP filter and auto ATU as well as speech processing an a CW keyer with 3 message memories. It is an ideal all-in-one ham station for QRPers.
    [ Hits: 404 | Votes: 3 | Rating: 10 ]
Software : Circuit Design
  • mini Ring-Core-Calculator - Calculate windings on ferrite cores - The program can be used to calculate inductors (coils) and their number of turns on ferrite cores, ferrite shells and air coils. These can be used for baluns, Ununs, bandpass filters, low pass filters, resonant circuits, and more. The technical specifications of the cores are already integrated in the program. Application is free and runs on Windows 32 bit versions only. To make it run on Windows 10 64 bit need to be unzipped in a single folder.
    [ Hits: 390 | Votes: 1 | Rating: 1 ]
Software : Logging
  • TyQSL - Online Logbook - TyQSL is a modern Logbook by Hams, for Hams. A Place for other hams to take a look at your QSO statistics as well as search for QSOs in your Logbook that you made public. Just click onto your name in the Menu Bar when you are logged in to get to your public profile. Soma features includes Shows the users Valid Callsigns Look at QSO Statistics, Search Public Logbooks, Filters are avaliable to find QSOs fast Just share the Link on Social Media, QRZ, or Similar with other
    [ Hits: 302 | Votes: 0 | Rating: 0 ]
Software : iPhone : DX Cluster
  • iDX for iPhone - Free ham radio DX Cluster app for iPhone and iPad based on G7VJR DXlite, allow to easily filter by band, show skimmer or cluster spots, and call-sign search.
    [ Hits: 1236 | Votes: 39 | Rating: 9.35 ]
Technical Reference : Audio
  • JRC NVA-88 Modification - Adding 2 RCA inputs, 1 high impedance filtered audio output RCA 3, 3 HIGH PASS filters, 3 LOW PAS filters to the JRC NVA88 Speaker
    [ Hits: 54 | Votes: 0 | Rating: 0 ]
Technical Reference : Duplexers
  • VHF-UHF Diplexer - Diplexer is a passive device, a special filter circuit that seperates 2 different bands, not to be confused with the duplexer that usually separate 2 different frequencies on the same band.
    [ Hits: 1136 | Votes: 2 | Rating: 5 ]
Technical Reference : Filters
  • Tunable BandPass Filter - A homemade tunable bandpass filter for all HF bands from 160m to 10m
    [ Hits: 1119 | Votes: 3 | Rating: 5.67 ]
  • 30 Meter Band Pass Filter - A homemade band pass filter for the 30 meter band based on the original VE7BPO design
    [ Hits: 591 | Votes: 1 | Rating: 6 ]
  • 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: 376 | Votes: 1 | Rating: 10 ]
Technical Reference : HF Radios
  • PT40 7 MHz Transceiver by AA3SJ - Home made 40 meter transceiver project. The receiver is a Progressive Receiver with a few modifications. The Transmitter is a modified MFJ Cub circuit. Includes schematic and circuit diagrams for Receive Input Filter, 3-Pole 500 Hz Cohn Filter and 7 MHz Double Tuned Bandpass Filter
    [ Hits: 162 | Votes: 0 | Rating: 0 ]
Technical Reference : Homebrew
  • A CW Sidetone Bypass - A CW sidetone bypass for the NESCAF audio filter, a small and low cost circuit that works great.
    [ Hits: 481 | Votes: 0 | Rating: 0 ]
Technical Reference : Microphones
  • SSB Microphone Filter - Build this circuit to tailor your microphone response to different band conditions. A project by KG4JJH
    [ Hits: 465 | Votes: 1 | Rating: 1 ]
Technical Reference : TVI Filters
  • Fixing a 2 meter TVI Problem - Fix VHF TVI problems usign a quarter wave stub filter
    [ Hits: 273 | Votes: 0 | Rating: 0 ]
  • Television Notch Filters - Intersting article about TV interference, with several examples of TVI Filters, to reduce the passage of any RF above the 30 MHz including commercial Low Pass Filters, home made notch filters or coaxial filters.
    [ Hits: 454 | Votes: 2 | Rating: 3 ]

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