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74 links - and 3 categories

Antennas : 15M
  • Build a Lightweight 15m Yagi Antenna: Simple Design for Impressive Performance  new - In this article, Steve G0UIH presents a straightforward guide for constructing a lightweight 15m 3 Element Yagi antenna with impressive performance metrics. With a focus on ease of construction and efficiency, the design boasts a nearly 8.2dbi forward gain and 30db front to back ratio. Utilizing readily available materials and a hairpin match for impedance matching, this Yagi offers broad bandwidth and simple tuning for optimal operation across the 15m band.
    [ Hits: 49 | Votes: 0 | Rating: 0 ]
Antennas : 6M : 6 meter Yagi Antennas
  • A Loft-Yagi for Six Metres - This design makes the most of having to put an aerial in the attic. This inverted-vee yagi is giving good results at GW0GHF. Directive gain is about 6 dBd. The front-to-back ratio is not brilliant, about 20 dBd.
    [ Hits: 138 | Votes: 1 | Rating: 5 ]
Antennas : Feed Lines : Coax Stubs
  • Coax Notch Traps - Attenuating adjacent bands - Targeted Attenuation for Adjacent Bands. Filtering is needed between the two rigs to prevent physical damage to the RX front end and to prevent the kinds of high-signal overload conditions like desense and IMD - as well as containing harmonic energy.
    [ Hits: 134 | Votes: 0 | Rating: 0 ]
Radio Equipment : HF Transceivers : Elecraft K4
  • Elecraft K4D Sherwood tests - Collection of test reports done by Rob Sherwood on the Elecraft K4D, this version of the K4 does not have the hybrid front-end.
    [ Hits: 82 | Votes: 1 | Rating: 10 ]
Radio Equipment : HF Transceivers : Yaesu FT-817
  • Speech synthesiser for FT-817 - This construction project is for anyone wanting to give this popular little radio a voice of its own. This Speech synthesiser reads out the current frequency, mode and menu settings whenever they are changed via the front-panel controls
    [ Hits: 124 | Votes: 0 | Rating: 0 ]
Radio Equipment : VHF-UHF Mobile : ICOM IC-2100H
  • Programming Icom IC-2100H - Six Steps for Programming your IC-2100H from the front panel of radio. Using these steps you should have no trouble entering either simplex or repeater frequencies and saving them.
    [ Hits: 320 | Votes: 1 | Rating: 3 ]
Software : Antenna analysis
  • AN-SOF - Professional Antenna Simulation  updated - AN-SOF is a professional comprehensive software tool for the modeling and simulation of antenna systems. AS-SOF allows to describe antenna geometry, Choose construction materials, Describe the environment and ground conditions, Describe the antenna height above ground, Analize radiation pattern and front-to-back ratio, Plot directivity and gain, Analize input impedance and VSWR,Predict antenna bandwidth
    [ Hits: 240 | Votes: 2 | Rating: 10 ]
Software : Software Defined Radio
  • SDRangel - SDRangel is an Open Source Qt5 / OpenGL 3.0+ SDR and signal analyzer frontend to various hardware TX & RX Software Defined Radio. SDRangel uses sample source plugins to collect I/Q samples from a hardware device.
    [ Hits: 154 | Votes: 1 | Rating: 6 ]
Technical Reference : Filters
  • 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 : Homebrew
  • Experimental HF 6-band SSB transceiver - An SSB radio for the HF bands will be presented. Featuring 12 to 20 Watts of output power (depending on DC supply), full DDS frequency generation, covering 6 major frequency bands (1.8, 3.5, 7, 14, 21 and 28 MHz) within the short wave amateur radio spectrum. The rig also features colored LCD and front panel backlight.
    [ Hits: 709 | Votes: 14 | Rating: 9.86 ]
Technical Reference : Programming Radio : Cheat Sheets
  • Yaesu FT-857D Cheat Sheet - A PDF File to download and print, with a table of all menu options with values, default settings, description and a quick reference guide of the front panel menus
    [ Hits: 1539 | Votes: 0 | Rating: 0 ]
Technical Reference : Receiver Front-End Protector
  • KD9SV Front End Saver - Homemade RF limiter project, to protect the K3 receiver front-end for high radiofrequency based on the original KD9SV project.
    [ Hits: 325 | Votes: 0 | Rating: 0 ]
  • Receiver Front End Protection - A simple receiver front end protection ciruit idea to protect your receiver when it is not in use
    [ Hits: 1707 | Votes: 1 | Rating: 4 ]
  • RF Front End Protector - If You are using a separate receive antennas then you need a good protection circuit to eliminate the possibility of blowing out the receiver front-end while using these auxiliary receive antennas specially on low bands.
    [ Hits: 176 | Votes: 0 | Rating: 0 ]

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