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305 links - and 4 categories

DX Resources : Clusters
  • Reverse Beacon Network on live graph - Last 15 minute Reverse Beacon Network spots on live graph, let you filter by dx spot continent or spotter continent, as well as by band and let you reduce bandwidth
    [ Hits: 446 | Votes: 3 | Rating: 9.67 ]
Radio Equipment : HF Transceivers : Yaesu FT-847
  • FT-847 Roofing Filter Mod - The mod requires an INRAD 45,705 MHz Crystal Roofing filter and the IC-765 add-in Board
    [ Hits: 254 | Votes: 1 | Rating: 1 ]
Radio Equipment : HF Transceivers : Yaesu FT-950 Software : Android
  • SOTA Spotter - SOTA Spotter is an application written for devices running Android™ versions 4.0.3 and above (like smartphones and tablets). It can send spots, filter and trigger notifications for incoming spots.
    [ Hits: 395 | Votes: 3 | Rating: 9.67 ]
Software : Linux
  • GQRX - GQRX is a free and simple to use SDR receiver which runs on Linux and MacOS X. GQRX comes with a standard FFT spectrum and waterfall display and a number of common filter settings
    [ Hits: 758 | Votes: 1 | Rating: 1 ]
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: 535 | Votes: 31 | Rating: 9.52 ]
Technical Reference : Calculators
  • FIlters calculator - Passive Band-Pass Filter, low-pass filter calculator
    [ Hits: 327 | Votes: 1 | Rating: 2 ]
Technical Reference : Filters
  • Use Band Pass Filters to clean up Signals  updated - Clean Up Your Signals with Band-Pass Filters, a two-parts article published in this PDF file from a June 1998 QST article
    [ Hits: 589 | Votes: 1 | Rating: 1 ]
Technical Reference : Microphones
  • SSB Microphone Filter - Build this circuit to tailor your microphone response to different band conditions. A project by KG4JJH
    [ Hits: 373 | Votes: 1 | Rating: 1 ]
Technical Reference : Radio Frequency Interference
  • TVI Filters - High pass filter schematics for TVI and examples of finished filters
    [ Hits: 839 | Votes: 5 | Rating: 7.6 ]
Technical Reference : Receivers : Progressive Receiver
  • Using Inrad Xtal filter - Using the Inrad 200 Ohm 9 MHz Crystal Filter with the Progressive Receiver
    [ Hits: 280 | Votes: 1 | Rating: 10 ]
Technical Reference : TVI Filters
  • Characterizing a Bencher YA-1 Filter - Testing a Bencher YA-1 low-pass TVI filter with a spectrum analyzer with tracking generator.
    [ Hits: 150 | Votes: 0 | Rating: 0 ]
  • Fixing a 2 meter TVI Problem - Fix VHF TVI problems usign a quarter wave stub filter
    [ Hits: 160 | Votes: 0 | Rating: 0 ]
  • TVI filters - Examples of absorbtive low-pass filters in which the unwanted high-frequency energy is separated from the wanted output and then dissipated in matched resistors
    [ Hits: 235 | Votes: 0 | Rating: 0 ]
  • TVI Filters for 2m and 70cm - The TVI filters described in this page worked very well in curing a TVI problem on 2m abd 70cm
    [ Hits: 233 | 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: 367 | Votes: 1 | Rating: 5 ]
Technical Reference : Test Equipment : RF Sweep Generator
  • RF Sweep Generator - Notes about generating RF sweep signals on the Arduino for filter testing, a digital version of the old Wobbulator concept
    [ Hits: 513 | Votes: 0 | Rating: 0 ]
  • RF Sweep Generator - Hand made RF sweeper made to adjust the pass band of crystal filter
    [ Hits: 398 | Votes: 0 | Rating: 0 ]
  • A Heterodyne Sweep Generator - A Simple unit which can be used to plot the Response of IF Filters and IF Channels
    [ Hits: 541 | Votes: 3 | Rating: 5 ]
  • Simple Hartley Sweeper - This sweeper built for a narrow bandwidth filter adjustment, use a simple 555 version sawtooth wave generator.
    [ Hits: 516 | Votes: 0 | Rating: 0 ]

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