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305 links - and 4 categories

Antennas : 40M : 40 meter Loop Antennas
  • Receiving antenna for low bands - K9AY loop antenna installed at PA6Z Contest group. This is a receiving antennas for the low bands (160m, 80m and 40m). Include schematics and info on a building the control box, preamplifier and low-pass filter
    [ Hits: 18725 | Votes: 9 | Rating: 8.33 ]
Antennas : Feed Lines
  • Band Filters - Experience of band filters, for a contest multi operator enviroenment
    [ Hits: 3813 | Votes: 5 | Rating: 7.6 ]
DX Resources : Clusters
  • DXFun Web Cluster - DX Cluster mainly in spanish, with chat, filtering available upon user registration, propagation reports and solar status, includes also latest dx news.
    [ Hits: 4459 | Votes: 34 | Rating: 6.14 ]
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: 1797 | Votes: 1 | Rating: 1 ]
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: 1457 | Votes: 1 | Rating: 10 ]
Manufacturers : Test Equipment : Spectrum Analyzers
  • Trilithic - Broadband instruments, R and microwave components and filters, field analyzers, spectrum analyzers
    [ Hits: 478 | Votes: 0 | Rating: 0 ]
Shopping and Services : Amateur Television
  • Garth RF Filters - ATV Filters, RF filters dealer
    [ Hits: 698 | Votes: 2 | Rating: 6.5 ]
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: 1345 | Votes: 1 | Rating: 1 ]
Technical Reference : Duplexers
  • Diplexer design notes - Standard diplexer design is based on singly-terminated Butterworth filters.
    [ Hits: 5398 | Votes: 8 | Rating: 5.87 ]
  • A low cost UHF/VHF duplexer - 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: 8069 | Votes: 14 | Rating: 5.5 ]
Technical Reference : Filters
  • Interferences and filtering - General information on Filter passbands, interferences, TVI and RFI problems
    [ Hits: 1108 | Votes: 1 | Rating: 10 ]
  • 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: 1627 | Votes: 2 | Rating: 9.5 ]
  • 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: 920 | Votes: 4 | Rating: 9.5 ]
  • 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: 2162 | Votes: 1 | Rating: 1 ]
  • 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: 3035 | 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: 1199 | Votes: 0 | Rating: 0 ]
  • Band-Pass Filters for HF Transceivers - Do your multiple-transmitter field day or contest efforts suffer from intrastation interference ?
    [ Hits: 3639 | Votes: 2 | Rating: 9 ]
  • K2TR Coax Stub Filters - Multi transmitter filters
    [ Hits: 2968 | Votes: 7 | Rating: 6.43 ]
  • 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: 767 | Votes: 0 | Rating: 0 ]
Technical Reference : Homebrew
  • CW Filter - I0QM Gaussian CW Filter page This Filter for the weak signals is the evolution of the simple Universal State filter, already published on "Radio Rivista", the 8/1993
    [ Hits: 1723 | Votes: 2 | Rating: 8 ]

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