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This is a "techie" site, dedicated to presenting service manuals, parts lists, schematic diagrams and other information of value to restorers and technicians who try to keep these radios working -
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QST Magazine Product Reviews - Key Measurements Summary - HF-Transceivers or Receivers. Compares Yaesu FTDX5000, Elecraft K3, Flex 5000 and Kenwood TS-590S -
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This was the blogger home page of the Resonant Frequency podcast. Follow the link to get to new web site. -
Transmission Line Details. This utility program shows the impedance and SWR at both ends of a transmission line and the details of power loss in the line. It includes characteristics for over 40 built-in line types. You can modify these values to see how small changes affect the results or to specify custom lines. All program inputs may be changed directly or you can use spin buttons to make the changes. If you are using a moderately fast computer you can hold down a spinner and "watch the movie" on the charts as the results are recomputed. By AC6LA -
Temporary hf vertical installation for testing -
The Micro24 is a ultra compact microsize QRP SSB transceiver for the 20 meters amateur radio band. This transceiver is so small that it fits into one hand. -
Home made twin paddle morse code key designed by Steve Taylor G4EDG. -
The following very comprehensive list was produced by G6DOF and has been extracted from the amateur radio packet network -
Solartech Power Inc. manufactures, distributes and sells high efficiency solar panels and wind power turbines. -
Adventist World Radio, The Voice of Hope for all Peoples -
A Yaesu rotator controller made with an arduino -
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Meter capable of accurately measuring low levels of RF power -
The official site of the 1997 BS7H DXpedition to Huang Yan Dao (a.k.a. Scarborough Reef). -
In response to a question about Numbers Stations, their origin and purpose, the following information should be of interest. -
Free Windows APRS Client with capability of downloading free aerial photo and topo map data. -
A web site dedicated to hex beam homebrewing. The hexagonal beam has become a wildly popular antenna. It is a directional antenna that provides great performance and does not require a full scale, expensive tower. -
The 1960s mobile/base antenna returns, double G Whip for base use. -
HB9MTN loop motor control software. For motor control, either Centronics, RS232 or USB ports can be used, for CAT-Control the RS232 or USB ports. -
Yaesu FT-2000 Panadapter, using the Softrock 9 Lite, SDR receiver kit -
Organized in 1939, YLRL (Young Ladies Radio League) is a nonprofit organization of women Amateur Radio Licensees. With a membership of approximately 800, it is international in scope with about 100 of those members who are DX YLs. -
Durable Easy To Build 4 Element 6 Meter Quad Or 6N2 Or 4 Element 6 And 5 Element 2 Permanent Or Portable you decide based on your needs By WA8UEG -
A 5 element wide spaced yagi for the 20m long path to Europe was installed at ZL6QH, the antenna is fed with a 600 ohm open wire feed line. -
Live Fire Radio Streams From Maryland, Delaware, PA. -
UKSMG news, message board, and articles dedicated to encouraging amateur radio on 50MHz around the world. -
This is the right place if you are interested in the Yaesu VX-8R hand-held transceiver. -
Operating on the 2200m band (135.7-137.8 kHz) often presents challenges for amateur radio transceivers, which typically exhibit poor receiver performance at these very low frequencies. This project addresses the issue by providing a design for a dedicated 137 kHz antenna preamplifier, specifically tailored to improve signal reception for radios such as the _Yaesu FT-817_. The preamplifier circuit utilizes a low-noise FET input stage, crucial for minimizing self-generated noise and maximizing the signal-to-noise ratio from weak LF signals. The design includes a detailed schematic, component values, and construction notes, enabling homebrewers to build a functional unit. The goal is to achieve significant gain, making the faint signals on 2200m more discernible and improving overall band usability. Key design considerations include impedance matching to typical antenna systems and ensuring stable operation across the narrow LF segment. The circuit aims for a **low noise figure** and sufficient amplification to overcome the inherent limitations of general-purpose HF transceivers when operating below **200 kHz**. -
Large picture and data details of th IC-7000 -
Experiments on HF antennas for restricted spaces. In this article author experiments antennas for 80-10 meters band having just a very small garden and several restrictions. Basic antennas consists of laded multiband dipoles and fan dipole antennas -
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What is an EWE Antenna, comparisons, performance and homebrew plan -
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Florida DXers meet every other month in Ft. Lauderdale to discuss DX, antennas and such. We host the DX forum at the Tropical Hamboree in Miami the first Saturday in Feb. -
Ten-Ten International QSO parties logging program multi plaform run with Java under Windowd Linux MacOSX -
Hogar de Don Guido, the hotel and amateur radio station owned and managed by Guido Rosillo HC8GR -
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Honduran amateur radio club founded in 1958 in San Pedro Sula, Cortes. -
A free radio station that is transmitting world wide on several shortwave frequency 's with loads of pirate and freeradio information. -
Operating an 80/40/20M fan dipole for DX is analyzed through EZNEC modeling, focusing on the antenna's performance in a real-world, low-height installation. The resource details the physical construction and SWR measurements of the fan dipole, comparing them against EZNEC simulations. It also incorporates High Frequency Terrain Analysis (HFTA) data to illustrate typical DX elevation angles for various regions from New England, providing a crucial context for evaluating antenna patterns. The analysis presents EZNEC-generated azimuth and elevation patterns for each band (80M, 40M, 20M) at specific frequencies, showing gain figures at different elevation angles relevant to DX propagation. It compares the modeled SWR with measured SWR, attributing discrepancies to coax attenuation. The study concludes with observations on the antenna's azimuth performance (omnidirectional within ±1.5 dB) and its less optimal elevation gain at desired DX angles, highlighting the impact of low antenna height on DX capabilities. -
VE2ZAZ and distorted audio in SSB on some models prior 2006 -
To build a Band Decoder to drive our remote relays, we need to supply the band information from the rig to the decoder -
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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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A set of utilities for the SSTV enthusiasts. SSTV signal generator, to generate SSTV audio signals from a bitmap. SSTV Signal Viewer to demodulate SSTV signals, anf SSTV Image Denoiser to removes noise from the pictures. By VE3NEA.
