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Circuit diagrams to homebrew different baluns by vk2awx

Online map creation using AZ_PROJ

Interactive CW Keyer the best for DXers

Coax is a very important part of a satellite station. It is almost as important as the antennas you choose. This article discusses choosing coaxial cables for satellite communication, emphasizing factors like line loss. It compares types such as RG-8, RG-58, Belden 9913/9913F, LMR-400, and hardline, highlighting their impact on signal preservation.

The Swedish EH Antenna Group

Ham Radio Club in the Philippines

Icom IC-706 Extended receing mod From OH6LGM

Constructing a functional spectrum analyzer for the 0-100 MHz range presents a significant challenge for radio amateurs, often requiring specialized components and careful calibration. This project details a homebrew spectrum analyzer design utilizing common integrated circuits like the _SA605D_ FM receiver IC and _MAR-6_ MMIC amplifiers, aiming for a cost-effective solution. The design incorporates a low-pass filter, RF amplification, a voltage-controlled oscillator (VCO) for downconversion, and multiple IF stages at 150 MHz and 10.7 MHz, with a resolution bandwidth (RBW) of 15 kHz. Critical components such as the _SBL-1_ mixer and varicap diodes are specified, alongside instructions for winding inductors and tuning filters. The analyzer's performance is discussed in terms of input level limitations, specifically the 1dB-compression point and third-order intercept point, to ensure accurate measurements and prevent component damage. The _SA605D_'s logarithmic Received Signal Strength Indicator (RSSI) output serves as the detector, driving the Y-input of an oscilloscope, while a _TL084_ op-amp generates the sweep signal for the X-input. Potential enhancements include adding a step attenuator, improving front-end filtering, and implementing switchable IF filters for variable RBW, allowing for greater versatility in analyzing RF signals.

Pictures and dimensions of and HB9MTN DDRR antenna for 6 meters band

K9AY receiving antennas for PA6Z made by PA9M

Here is an antenna for the nineties. It's strong, computer designed, and has lots of gain. It is a full size, four element beam on 10, and three elements on 15 meters

Simple to set up PSK31 programme with some useful features.

Homebrewed SWR meters projects by G3TXQ

A homemade remote antenna switch made with an Arduino Uno by KK7S

AG4RQ's Homebrew Single-Lever CW Paddle

Eham users review of the Yaesu FT-897

How to easy connect two Pc together with a Ethernet Lan

Are you experiencing very high SWR with the 10M Modification to Ameritron AL-811 amplifier ? This is a good forum topic to fix this problem.

A two element multiband quad antenna

The CQ Callbook makes it easy to find QSL information from web-accessible sources like address and manager databases and country-specific callbooks. The search procedure is quite easy: just enter Callsign and click on the Search buttons.

The "Tiny 2" is a great little 2 meter beam. It has some really interesting properties and it is a fantastic first time antenna project for the beginner.

Eham TH-F6A reviews

Dual band vhf uhf dipole antenna by DL7JV

Lots of projects and introductions to RDF and T Hunting

Low Noise Antenna pre-amp for SAT, EME & DX-ing

The SQUARE-Pole is a 1/2-wave dipole that has been bent into a square by WB2VUO

VU2VWN project to homebrew a CW for 40 meters band

Simple program for ham radio Uses AX25 support built in Linux kernel, works in X11 graphics environment.

Article about the z-match antenna tuner

An Active antenna designed for VLF and shortwave radio reception. A small antenna capable of excellent performances on low bands, made on a copper plate and introductio to active antennas.

The purpose of this page is to show you how you can access a DX Cluster via the Internet. There are many software applications available, some are free some are not. Excellent page from OZ2M

Article by WB3GCK on 4 to 1 Un-Un

Live feed from Warren county fire dep. radio

A page about fascinating Very Low Frequency and natural radio, with lots of streaming audio links from remote receivers. Some experimental stereo pairs around the world.

This array has been in use since 1989. The SWR from 3.5 to 3.9 is below 1.5:1. The F/R of the array is 20dB average and with some signals even better.

A three tube regenerodyne receiver by Gary Johanson, WD4NKA

This circuit provides an interface between the Yaesu 920 transceiver and IBM computer sound card which allows data transfer and control of PSK31, RTTY, KEYBOARD CW, and SSTV modes for Amateur Radio

Reviews of the FT-950 PEP-950 enhanced version. AKA Mark 2

A vertical antenna specifically designed to work with the 80 meter CW beacon keyer

An interesting and very detailed report analysis of three populare HF+6m transceivers. Yaesu FT-950, ICOM IC-7410 and the Kenwood TS-590S by AB4OJ

Yaesu VX-3R reviews by the eham members

This page displays a 404 error, indicating the original content describing a simple _RS232 interface_ circuit is unavailable. The circuit was reportedly designed for older Kenwood transceivers and featured in chapter 22 of the _ARRL Handbook_. It likely involved basic electronic components for level shifting and signal conditioning between a computer's serial port and the radio's control interface. The intended project would have detailed the construction of a hardware interface, enabling CAT control for specific Kenwood models. Such interfaces typically convert TTL or CMOS logic levels from the radio to the +/-12V levels required by RS232, often utilizing ICs like the MAX232 or discrete transistor circuits. While the specific schematics and bill of materials are absent due to the page error, the context suggests a DIY electronics project for enhancing legacy amateur radio station functionality through computer control.

Applying for an FCC vanity call sign requires navigating the _Universal Licensing System_ (ULS) database to identify available call sign blocks and specific desired combinations. The process involves submitting an online application via the FCC website, ensuring all instructions are meticulously followed to avoid rejection. Typical processing time for a vanity call sign application is approximately **18 days**, after which the ULS database reflects the updated license grant. Operators often seek vanity call signs for various reasons, including aligning with a new license class, desiring a shorter call sign for CW efficiency, or simply preferring a more memorable phonetics. The resource emphasizes self-application to avoid third-party service fees, directing users to verify availability through tools like Vanity HQ. Key steps include selecting a primary call sign and several alternates, ensuring the chosen call sign conforms to FCC rules for the operator's license class. Payment can be made online or via check, with prompt submission critical to prevent application dismissal.

More links to Icom IC-746 resources on the web

FAR Circuits is exclusively a manufacturer of Printed Circuit Boards for electronic projects that are used by the Amateur Radio and electronic hobby enthusiast.

An RF power supply for 144 MHz schematics and instructions

This page shows W5AJ & KD5AAU setting up a self supporting crank over tower.

A site exclusively meant for the novice. Find all the information necessary to become an amateur radio operator! More India specific information.

Web Site of CB Radio station from Vernadsky Research Station on Galindez island 140URL9909

My first homemade SSB and CW receiver 10 kHz to 30 MHz