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Ham radio blog by KU7PDX Chris Arnesen

Before the advent of satellite communication, maritime communication adhered to an international protocol requiring ships and coastal stations to observe silent periods twice an hour, reserved specifically for emergencies. These silent periods were marked by red sectors on the 500 kHz frequency and green sectors on the 2182 kHz frequency. The 4-second red bars facilitated the manual transmission of the SOLAS distress signal.

Antennas custom made to your frequency of choice

Tutorial- WSPR receiver with Raspberry Pi and RTL-SDR

eHam reviews of Alpha 8410 HF power amplifier

Demonstrates the activities and mission of ARMIC, the Association of Visually Impaired and Disabled Radio Amateurs of Catalonia, operating under the callsign EA3RKR. The organization focuses on making amateur radio accessible to all, particularly those with visual impairments, by providing resources and fostering a supportive community. It highlights their commitment to inclusive radio operation within the amateur radio service. ARMIC's initiatives include an accessible radio school, emphasizing practical construction projects and operational techniques tailored for members. The association actively promotes participation in various amateur radio activities, ensuring that visually impaired operators can engage fully with the hobby. Their work underscores the importance of adaptive technologies and methods to overcome physical barriers in radio communication. This resource reflects ARMIC's dedication to building an accessible radio environment, aligning with the broader goals of the Grupo Social ONCE, a Spanish organization supporting blind and visually impaired individuals.

Current Solar Wind Conditions

E51LYC DXPedition to Pukapuka atoll OC-098 North Cook Isl 2017

A magnetic loop antenna designed for 14 MHz. This kind of antennas is also known as STL, small transmitting loop and can be an excellent solution when you are not allowed to put antennas on your roof

This morse key and buzzer design only requires parts that one may already have or are easy to find on the web. There is nothing critical except that the contacts must meet when the key is depressed.

Custom cases and stock cases

For more than 40 years the Group has been a leading light in the amateur radio community around the Derby area.

The Monongalia Wireless Association is the oldest active amateur radio club in Monongalia County. Based in Morgantown,WV

A 3 band dipole antenna for 40-80-160 meter bands, It's made with easily available materials and is designed for inverted V mounting. The antenna is shortened for these bands, but still manages to make contacts in 80m and 160m with stations in Canada and the USA. The construction details are provided, including the dimensions of the antenna elements and the traps. The antenna is easy to build and provides good performance in all three bands. In Italian.

DMR personal web site. Includes download links for Codeplug for Hytera AR685 PD685G, PD785G, PD785 & X1P with DMR Plus and Brandmeister support with VFO like channels. Repeater maps. In German.

The map display allows you to select by locator, or clicking on the map, where you want to calculate the probability of Sporadic-E by building a combination EPI, Es Probability Index, based on factors using many of the known parameters which can effect Es. T

A weekly net for new and returning hams, runs every Saturday from 00:00 - 01:00 UTC and can be heard across the world. During the weekly F-troop there are mentions of software, websites and solutions that are worth taking note of. This website attempts to document them.

Tips on QSLing. Once you work that DX station, you have won the battle, but the war may just be beginning. I am talking about getting the QSL card. There are several ways to go about this.

JE1TNL blog

Fractional Wave Loops antennas are a sort of magnetic loop antennas that differs in several aspects from the standard ones. Author is now SK however in his page he posted several examples and interesting links

Amateur radio news, events and other electronic stuff by KE2YK

KARS Keighley amateur radio society

The Linked Dipole is a multiband antenna designed for 80/60/40/30/20m bands, optimized for the (tr)uSDX low bands configuration. It incorporates a 1:1 Balun to prevent common mode currents, ensuring balanced operation with coaxial cable. The Balun, wound on an FT140-43 core, achieves 37-40dB attenuation. The design includes a 3D-printable housing for compactness and waterproofing, with labeled link insulators for ease of use. Wire lengths were meticulously adjusted for optimal performance with a 7m pole and 3m rope extension, ensuring the antenna's ends are off the ground for improved behavior. The project includes downloadable printables for DIY construction.

North bristol amateur radio club, M0NBC, G4GCT, G6PNB

Yaesu FT-8800R programming with FTB8800 by G4HFG

A lean design SSB-Transceiver for 14 MHz, Simple SSB Transceiver for 14MHz VFO controlled, 5W PEP

A review of the dual band FT-8800R transceiver by the jeep expedition group

The Tararua Amateur Radio Club, Branch 06 of the New Zealand Association of Radio Transmitters (NZART) is an incorporated society for Radio Amateurs and interested persons.

5T0SP Mauritania DX pedition 24 Nov - 10 Dec 2012

Republic of Niger 2017 5U5R DXpedition web site 2017 Mar 9 - 2017 Mar 2 Will operate 160 to 10m, also 5.360 MHz; SSB CW RTTY; QSL via EA5RM

Radioaficion,satelites,APRS,DX,scanner,radioaficionado,PSK31,by EA1URO Union de radioaficionados de Ourense Espana

How to solve RFI problems caused by the charge controller, which is a PWM type charge controller, that generates a lot of EMI interference

The Icom IC-7300 is a popular SDR transceiver known for its excellent performance in ham bands. However, users have reported issues with reception reliability outside these bands due to ADC aliasing. This phenomenon occurs when the sampling rate of the radio interacts with frequencies outside the intended range, leading to unwanted signals being received. For instance, when tuned between 30 to 36 MHz, users may inadvertently pick up WFM broadcast signals or PMR communications due to aliasing effects. This guide outlines modifications to improve the IC-7300's performance by addressing the low-pass filter design, which is crucial for reducing interference from these unwanted signals. The proposed modifications involve adjusting the low-pass filter on the PA unit to better attenuate frequencies that cause aliasing. Measurements indicate that the original filter design allows significant signal leakage, leading to false receptions. By implementing the suggested changes, users can achieve a notable reduction in unwanted signals, enhancing the overall functionality of the IC-7300. While the modification requires careful soldering, the benefits in performance make it a worthwhile endeavor for serious operators looking to optimize their SDR experience.

If your club holds only two-meter ARDF events, you are missing half the fun. There is another international foxhunting band, too.

In this post by N6CTA, discover the conversion of the Yaesu ATAS-120A screwdriver antenna for portable use. The author details the creation of two sets of radials, 16 and 32 in 16ft lengths, aiming to optimize the efficiency of ground-mounted antennas. Additionally, insights are shared on attaching male quick disconnect blade tabs, with potential plans for a radial plate kit.

DX pedition to ZK2C Niue February 2012

A pocket-sized homebrew 40m CW QRPp/QRP transceiver

A dedicaed vertical antenna for 80 meters band based on a 40 meter vertical experiment

Keller peak repeater association, operate an open amateur radio repeater in the San Bernardino, California, mountains.

Operating under the callsigns G1ORC, G4ORC, and M5ORC, the Oldham Amateur Radio Club (OARC) serves as a local hub for radio enthusiasts in Royton, Oldham, England. This RSGB-affiliated organization welcomes individuals with an interest in any facet of radio communication, fostering a community environment for learning and on-air activity. The club maintains an active calendar, detailing upcoming amateur radio events and specific courses hosted by OARC, providing a structured approach to engagement for its members. Club activities are centered at the No.1855 (Royton) Squadron Air Training Corps on Park Lane, a consistent meeting point for members. This physical location facilitates hands-on learning, equipment demonstrations, and social interaction among hams. OARC's commitment to the hobby is evident through its multiple transmitting licenses, enabling diverse operational experiences for its members across various bands and modes.

A document that will guide you on Coaxial-Cable trap optimization process to gain on global antenna performance and on increasing effective bandwidth.

OY/DL3UB , Faroe Islands (29. July - 09. August) verticals + PA (max 500w) WARC bands cw

South east africa indian ocean Amateur Radio adventure Seychelles 2010 m July 17 th until July 31th by ct1bww

Worked other amateur stations in each of the six continental areas of the world using Collins equipment two-way

IQ2VA ARI Sezione Busto Arsizio

With BktDxCluster you can connect to all DX Cluster with DXSpider Protocol and telnet connection, filter the spots, send new spots, send commands to the cluster, set the radio to the frequency of the spot through BktRemote. Adroid App

Testing a Bencher YA-1 low-pass TVI filter with a spectrum analyzer with tracking generator.

GREENSTONE USA leader in the Vacuum Industry manufacturing products such as Vacuum Tubes, Vacuum Capacitor, Vacuum Relays, Vacuum Contactors and Vacuum Interrupters.

Elecraft K2 mod. Narrower bandpass filter, better stopband attenuation

Design and manufacture antennas for mobile devices, wireless data including WiMAX, WiFi, and WISP (Wireless Internet), two-way radio and RFID (Radio Frequency Identification).