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Improper grounding or earthing system can cause several unwanted RF interferences (RFI) to television sets, broadcast receivers, hi-fi sets and telephone sets. In this Article the author explain how to setup a proper radio shack grounding using coaxial cable and ceramic disc capacitor -
Service manual in PDF Format for the Yaesu FT-7800 transceiver -
A moxon rectangle for 50 Mhz band -
An end fed 20 meter half wave antenna -
VHF UHF diplexer by G8MNY -
Part 2 You're now much closer to saying goodbye to your unwanted signal problems! -
A compact antenna for 160 meters, suitable for hams tha want operate top band buh have a limited space -
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A Useful Horizontally Polarised Omni-directional Antenna with Gain for 144 MHz -
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A PDF presentation about Amateur Radio and Linux by By: Dave Mamanakis. A beginners guide to Linux for radio amateurs, this presentation cover basic concepts of the open source operative system, from the basic installation to the setup of ham radio programs. -
An home made vertical dipole antenna made with simple material. The antenna has a total length of aproximately 16 feet. In this article appeared on June QST 2019, the author explain how he reached the optimal confirugation changing and adjusting the lower part of the antenna, trimming and spacing correctly the copper wire. PDF File to downloas -
G3XBM's Amateur Radio Page - with QRP, VLF and crystal set links -
A scanned PDF of this interesting book on HF Dipole antennas published by Stanford Research Institute -
This interface is intended to be used with all the popular digital modes like PSK31, RTTY, Olivia, etc., which modulate a continuous carrier. -
Schematic of Yaesu FT-857 main board original jumpers based on different radio type -
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Optimizing performances of the end-fed antennas QRP quarterly article -
In this article K3DAV show a very simple way to make an RF choke coil that will remove your RF feedback troubles -
Packet Radio networking home page with lots of informations and tech. resources -
An excellently presented article on the design and construction of a medium wave DX Antenna -
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Optimization tests of the W3EDP multi-band HF wire antenna a popular aerial among QRP enthusiasts because it is light weight and cheap. -
A complete guide to magnetic loop antenna construction, with analysis of multi-turn and single-turn magneti loops, and and insight on choosing the optimal capacitor, or homebrewing your own butterfly capacitor -
There are 2 possible TX extensions on the E version, either full TX (1.705 - 30 MHz) or just open up 5 MHz (cut the R968 jumper and make it into a K version). This mod has been tested on TS 590S and not on TS 590SG -
Optimizing the ZS6BKW antenna for full HF band coverage often requires specific modifications beyond its standard configuration. This resource details several enhancements, beginning with a simple series capacitor to improve 80m SWR, a technique W5DXP found effective for permanent installation due to its minimal impact on higher bands. Further improvements include a 10-inch parallel open stub for 10m resonance, shifting the frequency to 28.4 MHz with an SWR of approximately 1.8:1, a practical solution for Technician class operators. The document then explores a switchable matching section, adding or subtracting one foot of ladder line at the 1:1 choke-balun, which significantly impacts higher frequency bands and eliminates the need for a tuner on 17m. W5DXP's _AIM-4170D_ antenna analyzer measurements confirm these effects. More advanced modifications involve a parallel capacitor for further 80m SWR reduction, requiring remote switching for multi-band operation, and relay-switched parallel capacitors at specific points on the 450-ohm matching section to achieve low SWR on 60m, 30m, and 15m. These detailed steps, including _Smith chart_ analyses for the challenging bands, aim to transform the ZS6BKW into a truly all-HF-band antenna, reflecting W5DXP's practical experience in antenna tuning. -
The ZS6BKW multiband antenna, an optimized variant of the classic G5RV, features a 102-foot (31.1 m) horizontal span and a 39.1-foot ladder line matching section. This design, derived by G0GSF (formerly ZS6BKW) in the early 1980s using computer programs and _Smith charts_, aims for improved SWR across multiple HF bands compared to its predecessor. Construction details specify Wireman 554 ladder line and #14 AWG THHN copper wire for the radiators, with precise instructions for determining the velocity factor (VF) of the ladder line using an antenna analyzer or dip meter, ensuring accurate physical length for the matching section. The radiator length is electrically 1.35 wavelengths for the 20-meter band, requiring careful trimming during tuning. Field measurements with an _AIM-4170C_ analyzer by KI4PMI and NC4FB demonstrated good SWR curves and bandwidth on 6, 10, 12, 17, 20, and 40 meters. The antenna was deemed unusable on 15 and 30 meters due to very high SWR, but an LDG AT-100PRO autotuner successfully brought 6 and 80 meters into tune. Contacts were made on 80, 40, 20, and 17 meters, including a **17-meter** contact to Spain. EZNEC models for 80-6 meters are provided, along with an AutoEZ model by AC6LA, which predicted good SWR for 80-10 meters. W5DXP's modifications for an all-band HF ZS6BKW are also referenced. -
A Variable Base-Loading-Coil for use under a HF Mobile Whip -
A multi-band portable vertical antenna can be built with relatively ordinary components obtained from the local hardware store, including replaceable loading coils -
Experiments with spiral dipole antennas. Includes two spiral antenna designs for 20 and 40 meters band by KN9B -
Intended for portable long-term usage and also good for Field Day Events article by By Steve KB1DIG & Kim KB1GTR -
The skeleton slot antenna design was developed in the UK for TV use soon after WW2. This document describe and adapted version for the 2 meter band -
This article is designed to be an introduction to the terms and basic mechanics of propagation methods that are to be found on the HF and VHF bands. -
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Yaesu FT-2000 Panadapter, using the Softrock 9 Lite, SDR receiver kit -
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A magnetic loop antenna working from 30 to 15 meters with 100W -
A two meter Quad antenna project with detailed instructions on how to adjust the Quad gamma match -
This is an experimental CW transceiver for 80m, although the same idea will work on all HF bands -
An Experimental, High-efficiency, Graphic-Tunable Magnetic Loop antenna and loop controller in a 52 pages PDF presentation with drawings and pictures -
CWQSO allows you to practice sending and receiving morse code in a real QSO. You can send CW via the mouse buttons or an attached paddle, the CW you send is displayed on CWQSO -
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The GM3VLB Poor Man's Antenna Analyser -
Lights on why 160 meters is so unpredictable and what is being done to reveal its secrets -
This is an Android application used to remotely control several HAM radio Web SDR or any CAT enabled transceiver -
A project of a small antenna, just 50 cm for the 7 MHz band. An EH Antenna plan for the 40 meters band -
Calculating HF helical whip antenna for mobile or portable operation -
Guide to ground mounting antennas, notes on efficiency, elevated installations, metal towers and masts, other mounting schemas, moble homes and rv, lightning protections, artiche by Bencher