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330 links - and 4 categories

Antennas : Feed Lines : Choke
  • Chokes Explained - A "choke" is the common name given to an inductor that is used as a power supply filter element. They are typically gapped iron core units, similar in appearance to a small transformer, but with only two leads exiting the housing
    [ Hits: 958 | Votes: 1 | Rating: 1.00 ]
DX Resources : Callsigns : Vanity Call Signs
  • Shortest Vanity Callsigns - This is a service for finding the shortest available vanity callsign in your amateur radio class. It filter through all possible callsigns and provide just the unused ones weighted by their length in morse code or their actual number of letters.
    [ Hits: 2574 | Votes: 61 | Rating: 7.40 ]
Manufacturers : Antennas : VHF UHF Microwave
  • Duplexers.eu - We produce duplex filters for 6 m, 2 m, 70 cm, and 23 cm band but also for HF bands. Sella and produce products for Ham Radio Repeaters.
    [ Hits: 1688 | Votes: 1 | Rating: 1.00 ]
Manufacturers : Filters
  • Accute Micro - China supplier of ceramic bandpass filters in standard resonator sizes of 2~6mm , 8mm , 10mm and 12mm with freqency from 400Mhz~4Ghz and sections 2~10
    [ Hits: 310 | Votes: 0 | Rating: 0.00 ]
Manufacturers : QRP Kits
  • Micro908 Kit - A re-usable control & computing platform for antenna measurement, PSK31 digital modems, audio filtering, signal source & VFO, memory keyer by AMQRP
    [ Hits: 1399 | Votes: 1 | Rating: 10.00 ]
Shopping and Services : Amateur Television
  • Garth RF Filters - ATV Filters, RF filters dealer
    [ Hits: 595 | Votes: 2 | Rating: 6.50 ]
Shortwave Radio : SWL Resources
  • SWL DX Cluster - Web cluster for swl's. With many features, including filters, search, SWL Database, lookups
    [ Hits: 1215 | Votes: 8 | Rating: 4.25 ]
Software : Contesting
  • Super Check Partial Database Files - The Super Check Partial database files provide a list of callsigns used by active contesters. The data comes from Cabrillo logs contributed by contesters themselves. Contributed logs from the past 24 months are used to create the database. These logs are combined and filtered so that they result in a fairly good (but not perfect) list. The files do not contain any QSO data, such as state, CQ zone, Maidenhead Grid Locator, etc. The dta files can be used with CT, WriteLog, TRlog, SD, N1MM Logger, NA, Win-Test, and others
    [ Hits: 771 | Votes: 2 | Rating: 10.00 ]
Technical Reference : Audio
  • Audio processor for SSB transceiver - This circuit consists of microphone amplifier and a high pass filter. Suitable to improve signal readability.
    [ Hits: 1253 | Votes: 1 | Rating: 1.00 ]
Technical Reference : Duplexers
  • A low cost UHF/VHF duplexer  updated - Duplexers for dual band radio are usually high pass filter and low pass filter combined in the same box. This circuit is a design within a cost of US$10.
    [ Hits: 7421 | Votes: 13 | Rating: 5.15 ]
Technical Reference : Filters
  • Easy bandpass filters - Quick and easy bandpass filters for receiver input by George Dobbs G3RJV
    [ Hits: 1888 | Votes: 1 | Rating: 9.00 ]
  • 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: 640 | Votes: 0 | Rating: 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: 1049 | Votes: 8 | Rating: 3.00 ]
  • 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: 1523 | Votes: 2 | Rating: 2.50 ]
  • 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: 926 | Votes: 6 | Rating: 7.67 ]
  • Interactive Digital Filter Design - This is an interactive filter design package, for designing digital filters
    [ Hits: 823 | Votes: 3 | Rating: 6.67 ]
  • 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: 1270 | Votes: 4 | Rating: 6.75 ]
Technical Reference : TVI Filters Technical Reference : Test Equipment : Signal Generator
  • VHF signal generator - a simple VHF signal generator in order to measure the characteristic of low pass filter.
    [ Hits: 3029 | Votes: 3 | Rating: 6.33 ]
Technical Reference : Transverters
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