la pass ic

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la pass ic

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Antennas : End-Fed : End Fed Half Wave Antenna
  • Comparing Mobile whip versus EF HW Vertical - PH0NO conducted field tests comparing a mobile antenna (DX-UHV) to an end-fed half-wave wire. Results on 20m showed the end-fed wire outperforming the mobile antenna, with a significant difference in signal strength. On 40m, the end-fed wire surpassed the mobile antenna in spots and reach. While the mobile antenna is more practical, the end-fed wire offers superior performance. Further testing is planned.
    [ Hits: 81 | Votes: 0 | Rating: 0 ]
Antennas : Slim Jim
  • 2m Slim-Jim Aerial using Ladder-Line - The Slim-Jim is a bit of a classic - building one is almost certainly a rite of passage and you will be glad that you did: It is easy to make, fairly easy to tune and rolls-up for transportation.
    [ Hits: 184 | Votes: 2 | Rating: 10 ]
Antennas : Tuners
  • A Homebrew Z-Match Transmatch - A home made antenna tuner based on the W6JJZ basic concept that ,atches balanced loads without the use of lossy baluns, can provide band-pass filtering and harmonic attenuation.
    [ Hits: 1099 | Votes: 0 | Rating: 0 ]
  • 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 ]
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 ]
Operating Aids : Traffic Handling
  • International Third-Party Traffic - Third-Party Operating Agreements. Occasionally, DX stations may ask you to pass a third-party message to a friend or relative in the States. This is all right as long as the US has signed an official third-party traffic agreement with that particular country
    [ Hits: 349 | Votes: 0 | Rating: 0 ]
Operating Modes : GPS
  • Homebrew GPS tracker - It is easy today to build a GPS tracking system for mobile applications that can be adapted to your needs. In fact, it is more accurate to speak of a GNSS (Global Navigation Satellite System) tracker, a term which encompasses the 4 positioning systems or satellite constellations.
    [ Hits: 241 | Votes: 1 | Rating: 7 ]
Shopping and Services : Regional : Australia
  • MiniKits.com.au - Australia's largest range of Electronic Kits & Components In Stock for the Radio Experimenter, ATV, microwaves, HF Band pass filters
    [ Hits: 836 | Votes: 0 | Rating: 0 ]
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 : Macintosh
  • SoundFlower - Soundflower is a Mac OS X (10.2 and later) system extension that allows applications to pass audio to other applications. Soundflower is easy to use, it simply presents itself as an audio device, allowing any audio application to send and receive audio with no other support needed. Soundflower is free.
    [ Hits: 3556 | Votes: 4 | Rating: 7 ]
Software : Virtual Audio Software
  • Audio Repeater - Audio Repeater is a windows application tha allows you to transfer, transmit, sounds from an input audio endpoint or device to an output one Playback. Audio transfer can be performed in any PCM audio format supported by Windows. KS version communicates directly with audio driver, bypassing all additional Windows audio processing
    [ Hits: 502 | Votes: 1 | Rating: 10 ]
Technical Reference : Calculators
  • 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: 157 | Votes: 3 | Rating: 5.33 ]
Technical Reference : Components
  • Repair or Replace Electrolytic Capacitors - For low voltage applications, like cathode bypass capacitors, most vintage types have an axial configuration, which is less common today but still available. Electrolytic power supply caps likely constitute the single worst liability in old audio, radio and test equipment. Rap about Electrolytics, Reforming, Chassis-Mount Replacements, Under-Chassis Installation, Rebuilding Capacitors
    [ Hits: 120 | Votes: 1 | Rating: 6 ]
Technical Reference : Filters
  • Constant k Lowpass Filter Design - Online Constant - k Lowpass Filter calculator
    [ Hits: 450 | Votes: 12 | Rating: 3.67 ]
  • Highpass filter calculator - Butterworth Highpass Filter Designer
    [ Hits: 442 | Votes: 4 | Rating: 2.75 ]
  • Enhancing Frontend Performance with Optimized Band Pass Filters - This article explores the nuanced design challenges of Band Pass Filters (BPF) in radio receivers, balancing low insertion loss, high stop band rejection, and narrow bandwidth. The focus is on the "Series-Trap, Shunt-C" topology, resonator count impact, and meticulous layout design for superior stop band performance across various frequency bands
    [ Hits: 82 | Votes: 0 | Rating: 0 ]
Technical Reference : Spectrum Analyzers
  • 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: 119 | Votes: 0 | Rating: 0 ]
Technical Reference : TVI Filters
  • 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: 356 | Votes: 0 | Rating: 0 ]
Technical Reference : Transverters
  • Innovative 2m to HF Converter - Ulrich L. Rohde N1UL conceived an outstanding 2m to HF receiving converter with specific requirements, including 144-148MHz to 28-32MHz coverage, low noise, high IP3, and a unique modular design. The design decisions emphasize modularity, absence of preselection, stability, and a passive mixer, showcasing Rohde's distinctive approach.
    [ Hits: 60 | Votes: 0 | Rating: 0 ]

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