This two-axis tracker tracks satellites with high accuracy entirely by reference to built-in spatial sensors in conjunction with a 9-DOF (degrees of freedom) sensor attached to the antenna boom and a GPS receiver.
This note looks at the antenna and antenna model for the 40 meter Moxon Yagi designed by Dave Leeson, W6NL. The performance of the antenna, through the model, will be explored in several typical settings.
History of codes of the world, russian codes, visual codes, and al long collection of telegraph codes as used worlwide including the international morse code and the relative variations
An umbrella antenna is basically just a vertical monopole antenna that is top-loaded with a large end-hat. The hat consists of a number of radial wires that slope away, downward from the top of the antenna.
A rotary dipole for thr 7 MHz 40 meters band, build recovering a couple of sections of an old commercial two element yagi antenna of one inch aluminium tubing with fiberglass rod insulators in them
The W8JK is a famous and effective DX antenna, first built by John Kraus, W8JK, in 1937. A Beam antenna with two parallel dipoles driven with opposite phase, with a close spacing of an eighth of a wavelength.
Baluns are usually used by Hams to feed dipole antennas with 50 ohm coax and to transpose from ladder line feeding a multi-band antenna to the unbalanced input of an antenna tuner.
This project is based around the recent HF1 QRP transceiver by Ashhar Farhan, VU2ESE. The transceiver is an interesting SSB design with wide tuning range from 0-30MHz and should cover several amateur bands. The schematic for the transceiver can be found on the Minima mail list in this post with a PDF attachment
The Vertical Moxon had everything I was looking for, a low TOA (Takoff Angle), wide horizon coverage, and good impedance loading. All of this was in a small enough package to fit in my relatively small back yard.
The main issues with portable HF operations have become not issues of the transmitting and receiving equipment itself but of providing power and antennas
An Arduino based remote monitoring system. The Remotino is a remote monitoring system based upon two Arduino Nano units RemotinoSampler and RemotinoViewer that are connected
A ham radio logging solution. Built on mysql/maria db and php, it allows you to host a log on a web server and have easy access to viewing editing deleting backing up and restoring the log. Allows everyone to view the log and a central admisitrative section which when logged into allows you to add and edit and remove entries. It features an easy to setup page, run the setup page and enter the required values and your set to start logging. It is primarily mobile friendly, easy on bandwidth and should work well in any browser. If entering a contact that you have worked before it will show the last 5 dates and times of that station.
Antenna modeling discussions about What happens if… a dipole is bent horizontally, laterally, vertically. Zig-zag, meander, catenary curve. Effect of sag, elevation, radials. OCF off-center feed, harmonics. Includes 4NEC2 antenna models for each study.
The HB9CV is a well known two element antenna of a directional beam type with a forward gain of 4 to 5 dBd. This one is for two metres but it can be scaled, from the dimensions in the diagram, for other bands I have also made them for four and six metres
A 500 kHz to 5.5GHz 2-port vector network analyzer designed for use with any Linux, Windows or MacOS computer. High performance: up to 80 dB dynamic range in the MHz range; up to 40 dB in the GHz range
An interesting article dedicated to hams that want to start learning morse code, including notes on Methodology, online training tools, and a guide to Morse Keys
Switchable MTFT for Wire-Antennas, Bent Dipoles reference website, UHF Crystal Radio, How to make a HB9CV , Spark Gap Transmitter, pocketVNA – portable Vector Network Analyzer, Learn Morse Code, Ham Radio – QRP, iotamaps – IOTA mapping project, KO4BB’s Manual Repository,
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
OEMSEMI is an independent distributor for electronic components, offering worldwide spot components supply service and solutions to obsolete components supply.
Tektronix Signal Generator web site. A Tektronix signal generator can create a virtually unlimited number of signals – analog or digital, ideal or distorted and more.
Vox recorder is activated by voice and sounds exceeding a threshold. It saves for every record a .caf file that you can play, delete or send by email. Useful for surveillance records, hamradio scanners, and many many other applications. You’ll be surprised to hear what happens in an all night using Vox recorder.
Here we have a ground plane antenna mostly used for 144, 222, 440 Mhz. Its one of the simplest antennas to make. New hams can build this with little to no experience in antenna building.
Meet The Breakers Cb Radio from the United Kingdon, brought to you by Colin The Head, star of Disused Railway Diaries and Colins World Of Everything, Antenna, Ham Radio and signal checks.
A custom manual for the Yaesu FT 450 owners, tha includes system controls, factory reset procedure, procedural uses, memory management, programming and many more
Amphenol RF is a leading manufacturer of coaxial connectors for use in radio frequency, microwave, and data transmission system applications. Headquartered in Danbury, Connecticut, USA, Amphenol RF has global sales, marketing and manufacturing locations in North America, Asia and Europe. Standard products include RF connectors, coaxial adapters and RF cable assemblies. Custom engineered products include multi-port ganged interconnect, blindmate and hybrid mixed-signal solutions.
Dodgy plans to make Archimedean spiral antenna for RTLSDR software defined radio receiver. Made of two equal lengths of coaxial cable seems to be the easiest circularly polarized antenna to make that will cover a broad range of the rtlsdr dongles E4000 tuners
OSX/Mac and Windows versions of SdrDx. Supports RFSPACE, FunCube Pro, Andrus MK1.5, AFEDRI, FunCube Pro Plus, Peaberry, RTL sticks (RTL supported under OS X only, via this OS X RTL server) and Softrock SDR receivers.
The N0QBH QRSS project page, a couple of projects using available kits for improved frequency and timing stability. A configurable DDS VFO 100mW transmitter with LCD display and a modified Hans Sommers 40m 100mW transmitter
These simple instructions will guide you through the operations required to calculate antenna system VSWR: preparation, connecting the wattmeter, taking the readings, calculating VSWR, and disconnecting the wattmeter.
A Half wave antenna has a high impedance feed point. This can be matched using a 1/4 wave stub matching section and converts the 40m vertical into an L-shaped 20m J-Pole antenna. The 300 ohm feeder used for this purpose must be kept away from the ground.
This wiki is intended to help identify radio signals through example sounds and waterfall images. Most signals are received and recorded using a software defined radio
This page describes a successful antenna designed during 2014. It covers 4 HF bands 40/20/15/10m. A developed version of the old Windom idea, where the feed point is off centre.
The function of the XPhase is based on the fact that the interfering signal, received by an auxiliary antenna, is added phase-shifted to the signal received from the main antenna. When the phase-shift is more or less 180°, the interfering signal is canceled out.
With the bluecat interface it is possibile to connect a Yaesu FT 817 857 897 to a computer or a android smartphone without any cable or interface, using a bluetooth wireless connection
Spectrum Analyzer Fundamentals is a great document explaining everything about Sprectrum analyzers, main features, differences, usage and characteristics provided by Keysight Technologies. Inc
If you want to design vertical antennas you can find all theory and formulas used to model a vertical aerial calculating capacitance, reactance, building the inductor and calculating resistances. Includes an excel spreadsheet to calculate efficiency.
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
Not many HAM radio programs do already support the IC-7300. As far as CAT commands, the IC-7300 seems to be compatible with older radios like the IC-7700. Here’s a description of setting up your IC-7300 radio to work with the last freeware version of Ham Radio Deluxe (5.24).
The problem originates by improper TXOUT-to-RF timing (RF transmission exists still after a TX-EN prohibition), combined by too long decay of their CW pulses.
A sourge arrestor for PL 259 connectors. A voltage surge arrestor to limit the voltage that may come back down the wire or coax after there has been static build up
The reasons for logging your amateur activity fall into three categories: legal, operational and personal. Legally, a log of your transmissions would be invaluable in proving your innocence in an interference complaint. Operationally, having a log of past contacts is a resource when filling out that DX QSL card that may have taken months to arrive
A shortwave active antenna, riginally designed for long wave and medium wave reception, but that works well all the way up through the shortwave bands based on the PA0RDT design
his antenna analyzer is build based from a kit purchased direct from Fox Delta. The antenna analyzer uses PC software to do all the number crunching and display the data.
The collinear J-Pole, often known as the Super-J, does improve the behavior over a regular J-Pole. As many attest, there is an advantage when vertically combining 1/2 radiating sections to have a bit of separation between the half-wave end points. The Super-J has very little separation between the two half-wave radiators.
An interesting combination of a Baofeng UV-3R handheld transceiver with a Mobilinkd Kiss TNC as a result of a continual improvement of the original APRS in your pocket project
FLMSG is a simple forms management editor for the amateur radio supported standard message formats. Form data can be transferred between computers either using standard internet email or via radio frequency broadcasts typically made by an amateur radio operator on your behalf.
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
Programming the FT-8800R via the front panel and microphone keypad is not extremely difficult. Already having a list of local repeaters in CHIRP, the addition of a USB cable would allow you to coordinate the memory layout across multiple radios with ease.
During the 2016 we reviewed and added in our links-directory 768 new links.
Here you are a selection of the best links added during the 2016
We hope you enjoyed to stay with us during this year, and we wish to review and add even more and more new amateur radio related resources in coming new year.
Free CW morse code decoder software for Windows versions : Vista sp2, 7, 8, 10. Decode CW signals with auto tracking features, auto detection of speed (by LY3H)
This note looks at the antenna and antenna model for the 40 meter Moxon Yagi designed by Dave Leeson, W6NL. The performance of the antenna, through the model, will be explored in several typical settings. (by W8WWV)
The W8JK is a famous and effective DX antenna, first built by John Kraus, W8JK, in 1937. A Beam antenna with two parallel dipoles driven with opposite phase, with a close spacing of an eighth of a wavelength. (by ZR6TXA)
An homemade portable vertical antenna with a trap near the mid point of the main element. The trap is made with 42mm diameter PVC pipe with 9 turns of wire on it (by VK3ZPF)
The antenna is an inexpensive, multiband, end fed HF antenna. It has a matching network consisting of a toroid core and an antenna lead of 30 (by WB5CXC)
This project is to build an Antenna Wire Launcher (Spud Gun). It is constructed from PVC pipe and has a manual release. The device will send a puck over 100 trees without much work. (by WB5CXC)
A lightweight inverted vee antenna that can be supported by a 10 metre long fiberglass squid pole. The antenna is designed to cover 10, 15, 20, 40 and 80 m bands. (by VK3ZPF)
The BP-3 was a valve-based spy radio transceiver, developed during WWII by Tadeusz Heftman of the Polish Military Wireless Unit in Stanmore (UK). It was introduced in 1943 and was intended for use by Agents and Resistance Organisations in Europe. The transmitter produces an output power of 50 Watts in CW (by CryptMuseum)
Here is an old ham radio operators trick for cleaning wires for soldering that are old and corroded. It is hard to find this technique printed anywhere! (by NH7ZE)
The Folded Dipole is not used much amongst Radio amateurs, probably due to the fact that this antenna uses twice as much wire as a single-wire dipole. (by LA8OKA)
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. (by G4UCJ)
An online link dipole antenna designer allow calculate up to five elements of a linked dipole simply by deciding the desired frequency and defining the support dimensions. (by sotamaps.org)
Small and inexpensive homebrew HF radio 5W Output, CW SSB AM FM, DSP, Speech Processor, Sprectrum Scope, Watefall Display. mcHF is a small, home-brewed amateur radio project. Firmware is released as open source. (by M0NKA)
This two-axis tracker tracks satellites with high accuracy entirely by reference to built-in spatial sensors in conjunction with a 9-DOF (degrees of freedom) sensor attached to the antenna boom and a GPS receiver. (by Elwood Downey, WB0OEW)
Baluns are usually used by Hams to feed dipole antennas with 50 ohm coax and to transpose from ladder line feeding a multi-band antenna to the unbalanced input of an antenna tuner. (by W4ULD)
Here we have a ground plane antenna mostly used for 144, 222, 440 Mhz. Its one of the simplest antennas to make. New hams can build this with little to no experience in antenna building. (by KJ4PWP)
A sourge arrestor for PL 259 connectors. A voltage surge arrestor to limit the voltage that may come back down the wire or coax after there has been static build up (by G8ODE)
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
