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Notes on using a modified R7100 with discrimator tap

Product information, resources, enhancements and links of the popular ICOM IC-756PRO III

Experiments on vertical antennas for HF bands.

Spitfire Collinear Arrays for 160 meters band at UA2FW

Fixing a problem on the Alpha 87A amplifier by replacing a blower by WD0M

shedberg, spinning & grinning livejournal blog

A large collection of electronic components symbols in spanis

Presents various amateur radio topics through blog posts, detailing operational experiences and technical insights from the perspective of SV2YC. The content frequently discusses antenna projects, such as a **portable 20m/40m dipole** designed for rapid deployment, and explores the performance characteristics of different wire configurations in varied field conditions. Observations on propagation and band activity across the HF spectrum are also regularly documented, providing practical context for fellow operators. Specific entries often include detailed accounts of **DX contacts** and participation in minor contests, outlining station setup, power levels, and antenna choices. The blog also covers modifications to commercial transceivers and homebrew accessory construction, offering practical advice on improving station efficiency and functionality. Further posts delve into software applications for logging and digital modes, sharing configurations and operational tips for maximizing their utility in daily amateur radio activities.

TJ2TT log online and QSL request

HF propagation to your Linux desktop. CQRLOG uses data from HamQSL website provided by Paul, N0NBH.

Although most Preselectors are designed with an internal T/R relay, theoretically enabling direct insertion between the transceiver and the antenna, there is a problem when running CW, especially when running full QSK. The switching time of the internal relay is too slow to follow full QSK. The best way to avoid this problem altogether is to insert the Preselector directly into the transceiver’s RX antenna line, thus avoiding entirely the need to switch the Preselector in and out.

Exaustive review of the self-contained, top-performance HF/6m transceiver Icom IC-7700

Personal web site by Joe PS8ET an active amateur radio operator from Brazil very active both on HF bands and on Ham Radio Satellites.

Yamuna Cable Accessories Pvt. Ltd. specializes in the development, manufacturing, and marketing of power cable accessories, including a comprehensive range of cable jointing kits and components. The product line encompasses _Heat Shrink_ and _Cold Shrink_ cable joints, heat shrinkable tubing, pre-moulded slip-on joints, resin pour, and Tapex systems, all designed for applications up to 66 kV. The company highlights its ISO 9001-2015 certification, signifying adherence to international quality management standards in its manufacturing processes. The resource details specific product categories such as end caps, insulation piercing connectors, copper mesh, fireproof coatings, tubing and components, lugs and ferrules, and safety products. It also features specialized items like _Elbow Connectors_ rated for 25 kV-250, 400, and 630 amps, and various types of tinned copper braid used for grounding and electrical shielding. The site provides an overview of their manufacturing capabilities and global presence across 40+ countries. Established in 1973, Yamuna Densons has over four decades of experience in the industry, positioning itself as a significant designer, manufacturer, and supplier of insulators, tabs, and cable jointing systems in India. The company emphasizes its role as a leading exporter of these products, serving both domestic and international clients.

Afghanistan 2011 DX Pedition

A homemade simple and inexpensive portable antenna support, handy for quick trips to the field and other portable operations

A cavity backed antenna is a practical slot antenna tipically used in microwave applications

Using DX4WIN with ICOM radios and the ICOM PW-1 RF power amplifier

But it is only a couple of dB, The Effect Of Insertion Loss On Transmitted Power (dB to percentual loss) Original Information Provided by Neil McKie WA6KLA

FP/KV1J July 2014 DXpedition to Miquelon

The antenna ground or earth system can be key to its operation whilst also being a key safety feature. This article is about grounding systems for antennas, covering different aspects of grounds made for antenna safety, or expressly for lightning or just to improve antenna performance, being ground an antenna component.

Successor to the Metamorserino, this is a multi-functional Morse code machine (Keyer, Generator, Trainer) that includes also a transceiver using LoRa on the 70cm band.

Tubes and electronic components online shop. Dealer for svetlana, sovtek, tesla, mullard and tungsol tubes

A windows program to learn Morse code and doing QSO in CW. The training course contains 39 Lessons based on Koch method. It can sends only letters, only numbers, only punctuation

Asociacion de radioaficionados rocieros

How to set new squelch values on Baofeng HT Radios by using the CHIRP software. Make sure you save the original configuration before editing squelch levels. Edit at your own risk.

A tutorial on how to get started operating RTTY using MMTTY as the primary program to begin your RTTY operations. Installing, configuring and using MMTTY. Documentation in English and Spanish

Determining the characteristic impedance (Z) of an unknown coaxial cable, a common challenge for many radio amateurs, can be resolved with a straightforward method. The impedance of a coaxial cable is derived from its inductance and capacitance, and importantly, these values are independent of the cable's length or the operating frequency. This means that measuring a random length of cable, such as 20 meters, provides sufficient data for calculation. The core of this technique involves an LC-meter to obtain the inductance (L) in microHenries (uH) and capacitance (C) in microFarads (uF). The impedance is then calculated using the formula Z = L/C. For instance, a measurement yielding L=1.2uH and C=450pF (0.00045 uF) results in an impedance of 51.6 Ohms, closely matching **RG-58** specifications. Similarly, a TV coaxial cable with L=1.8uH and C=320pF (0.00032 uF) calculates to 75 Ohms. While the accuracy of this method, depending on the LC-meter's tolerance, is approximately 10%, it proves sufficiently precise for practical determination of unknown coaxial cable impedance, as noted by Makis, SV1BSX, who credits Cliff, K7RR, for the formula's dissemination.

A four position HF antenna switch with PC control

Icom IC-R75 product page at SWling.com with technical details and links

Iraqi amateur radio society

Portable Rotation manufacturer of portable antenna rotor and support systems including AZ/EL portatble rotor system, AZ/EL antenna position sensors, mounting kits for arrow antennas

If you want to have a closer look at the weather, you can download software and visually display data.

Wireless Society of Southern Maine Projects, instructions and photos for many ham radio projects and experiments, including antenna construction and modelling, kit building, station setup, restoration and more

Personal web site of VE2WPT Nick from Montreal Canada

Online shop for electronic components, sensors, connectors, capacitors, resistors, passives, semiconductors from Baitron independent electronic components distributor.

A CW Contest Simulator, a simulator for the weekly CWT contests sponsored by CWops, based on Arduino Nano

Elecraft new QRP transceiver, an 80-10 m SSB/CW/Data station that fits in your pocket

This free app encode pictures in Slow Scan TV SSTV signals. Support the most popular modes Martin 1, Martin 2, Scottie Modes, Robot and Wraase modes. Image editing is even possible with som text overlaying features

Ham radio, amateur radio, satellite communication, radio, radios,antenna, antenna design, yagi, cross yagi, power divider, splitter, Brisbane.

My place in cyberspace for thinking out loud about the Three Rivers Area Montioring Association

High Plate Voltages Reported via Telemetry on Alpha 8410 power amplifier by AE9K

Marscomponents is an independent distributor of electronic components. Offer one-stop sourcing service for ICs, connectors, discretes, transistors and other electronic components and devices

VK9GMW will be operating from Mellish Reef between March 22 and April 6, 2009.

March 2015 9Q0HQ Congo DX pedition

With over 1700 members CARMA is the largest scanner club in the USA. We support all facets of public safety and promote responsible radio monitoring.

I wanted to mount an amateur radio antenna on my truck that was more permanent than the magnetic mount on I already had, but I had a few specific design requirements for the project.

eHam users review of the Icom IC-R75 receiver

The K3NG Keyer is an open source Arduino based CW (Morse Code) keyer with a lot of features and flexibility, rivaling commercial keyers which often cost significantly more.

Ham radio stuff, scanner and shortwave topics at KE6ZGP blog