Home Blog Page 17

Special Event 75th Anniversary NCDXC

DXZone
-
1
Special Event 75th Anniversary NCDXC

On October 10, 2021 the Northern California DX Club will celebrate our 75th year! To mark this milestone we will hold an HF Special Event on the weekend of October 9th and 10th, 2021.

Using our call sign W6TI we can be found operating on bands 15, 17, 20, and 40 meters and using SSB, CW and FT8 modes. The festivities begin at 16:00-23:59Z October 9th and continue 16:00-23:59Z Sunday October 10th.

A special QSL card will be available upon request.  QSL details at W6TI on QRZ.com.

Since October 10, 1946 the Northern California DX Club has been dedicated to the finest ideals of good DXing, raising the standards of Amateur Radio practice and ethics and interactively sharing knowledge and information to enhance and benefit the Amateur Radio Community.

NCDXC has co-hosted the International DX Convention for over 70 years.

73 & Stay Safe,
Tony Dowler  K6BV
President, NCDXC
www.ncdxc.org

WSJT-X 2.5.0 New version available!

DXZone
-
0
WSJT-X 2.5.0 New version available!

 

WSJT-X 2.5.0 introduces an enhanced Q65 decoder that measures and compensates for linear frequency drifts of Q65 signals.

Activate this feature by setting a spinner control Max Drift on the WSJT-X main window to a number greater than 0.

We suggest a setting of 10 for submode Q65-60A, the recommended submode for EME on 50 and 144 MHz, which will accommodate drift rates up to 20 Hz/minute. Similarly, we suggest Max Drift = 40 for submode Q65-15C, used for for 10 GHz QSOs (up to 900 km) via aircraft scatter and drift rates up to about 20 Hz/s.

On the Windows platform only, WSJT-X 2.5.0 installations now include MAP65 3.0. This program works together with suitable hardware that converts RF to baseband.

The hardware/software combination implements a wideband, highly optimized receiver for the Q65 and JT65 protocols, with matching transmitting features that require a standard SSB transceiver.

MAP65 is effective in both single-polarization and dual-polarization systems. If two polarization channels are available, MAP65 determines and matches the linear polarization angle of each decodable signal. This capability provides a major advantage for efficient EME communication on bands up to 432 MHz. A single-channel MAP65 system works extremely well for EME on 1296 MHz and higher bands, displaying all signals in a 90 kHz sub-band and decoding all the Q65 and JT65 signals.

WSJT-X Download

Top Amateur Radio Websites – Issue 2137

DXZone
-
0
Top Amateur Radio Websites – Issue 2137

Antenna Switch
N6DLH
An home made antenna switch with a Dummy Load selector. If you forget the radio is connected to the open or grounded side of the switch and you try to transmit, it is very easy to damage the finals of your transceiver.
Groundplane Antennas at Various Heights
DF3LP
Mounting on roof at the right ground level can greately impact on antenna performances because will affect the radiated angle of energy.
QRP HF Loop Antenna
IZ0HCC
This is an uncommon loop antenna, hombrewed without the small feeding loop. With small spare parts is possible to build a loop antenna tuner for portable usage tha can ben used with common HF QRP transceivers
Homebrew 1 Watt 2.4 GHz Power Amplifier
N9ZIA
This will show you how to add a RF power amplifier to your Proxim Symphony for under $50. The cost is reduced by using the existing components on the Symphony, such as the PIN diode switch, and just inserting a higher power final amplifier. Increase the RF output power of your wireless network card to 1 Watt.
9 Element Yagi for 144 MHz
IT9VKY
A portable Yagi antenna for 2 meters band.
Slim Jim Antenna Calculator by M0NWK
M0NWK
Easy to use online Slim Jim antenna calculator. Input your frequency to automatically calculate the lengths of the different antenna parts.
Longmont Amateur Radio Club Website
W0ENO
Serving the Longmont Colorado area
7 Element QUAGI for Satelitte Operations
IT9VKY
In order to increase the gain for satellite opeations, working on 144 MHz bands, the author choose the Quagi design, having restriction of 3 meter lenght for the boom. In Italian

Top Amateur Radio Websites – Issue 2136

DXZone
-
0
Top Amateur Radio Websites – Issue 2136

Dummy Load Construction
N6DLH
This will document a custom version of the K4EAA Dummy load done using 20 1K ohm 3 Watt Resistors, Piece of brass sheet, a quart paint can and a BNC connector
CN2R Phased Beverages
CN2R
Picture collection of the beverage antennas installed with cross-fire feed at CN2R
Loaded Quarter Wave Antenna Inductance Calculator
M0UKD
Here is a formula and calculator for creating a loaded (shortened) quarter wave vertical or balanced dipole. The calculation refers to either a loaded 1/4 wave or a loaded dipole
100W UHF Linear Amplifier
M1GEO
This page details my building of a 100 Watt Power Amplifier for the 432 MHz Band based on two Motorola MRF646 transistors taking inspiration by Carlo Gnaccarini VK3PY, formerly VK3BRZ
G1MFG FlyDog Kiwi SDR
G1MFG
Online receiver powered by Kiwi SDR based in Bedford, UK
SDR Receiver with RTL-SDR and Gnu Radio
VK3FOWL VK3YSP
This project is a Software Defined Radio Receiver. It has a frequency range of 24MHz 1.2GHz. It can demodulate AM, FM, USB, LSB with selectable bandwidths of 600, 2400, 2800, 3200 and 6400Hz. Using a simple RTL-SDR Dongle and Raspberry Pi 3 computer using GNU RADIO
6el LFA Yagi for 50MHz
G0KSC
This six element LFA Yagi for six meters has a 1.5 inch square boom with a 1.5 inch secondary boom beneath the first. This ensures the 7.3 metre long boom will not sag and will not require any guying. This antenna has 12.3 dBi Gain and just over 23dB F/B.

Top Amateur Radio Websites – Issue 2135

DXZone
-
0
Top Amateur Radio Websites – Issue 2135

Trapped vertical Antenna
F5ZV
This antenna is an omnidirectional and multiband and it is well suited for DX enthusiasts with limited space. Each of the parallel circuits (trap) behaves like an isolator on its resonant frequency.
Simple 2.4 GHz SWR Meter
N9ZIA
This is a simple 2.4 GHz SWR meter which is based around surplus microwave hardware which can be easily found. The main component is a MECA -20/-20 dB Directional Coupler which has a frequency range of approximately 700 MHz to 2.5 GHz.
AN-SOF - Professional Antenna Simulation
ANS.SOF
AN-SOF is a professional comprehensive software tool for the modeling and simulation of antenna systems. AS-SOF allows to describe antenna geometry, Choose construction materials, Describe the environment and ground conditions, Describe the antenna height above ground, Analize radiation pattern and front-to-back ratio, Plot directivity and gain, Analize input impedance and VSWR,Predict antenna bandwidth
Beverage Receive Antenna
W7VO
The Beverage we use is a DX Engineering RPS-1 dual directional 360 foot 109,7 m, oriented due North/South, six feet 1,8 m off the ground. The antenna uses 450 ohm ladder line as the antenna, and 75 ohm RG-6u for the feedline. The antenna runs atop the fence between our property and 5 acres of pasture next door.
QRP Ham Radio Kits
EA3GCY
QRPhamradiokits is an online shop for custom amateur radio kits including QRP transceiver kits, tuners, cw keyers, VFO DDS, part and components
Spectrum Analyser I1KFH
I1KFH
A home mande spectrum analyzer project with several pictures and disposition of components boards based on a project by S57C
VA3RJ DX Calendar
VA3RJ
A list of announced DX operations compiled by VA3RJ

Top Amateur Radio Websites – Issue 2134

DXZone
-
0
Top Amateur Radio Websites – Issue 2134

Magnetic Loop Antenna for 2 meters
IZ0HCC
A small, easy to build, copper tube magnetic loop antenna for the 2 meters band. In Italian
PA0RDT MiniWhip
M1GEO
When experimenting with the WellGood Loop antenna, I came across the PA0RDT MiniWhip design referenced in several places. The construction of the PA0RDT MiniWhip is simpler than the WellGood Loop since there are no inductors to wind, but during my testing, I have found the loop to have slightly better performance.
J-Pole antenna for UHF Bands
IZ0HCC
This is a simple half wave antenna for 70 cm band, made using the jpole design.
432 MHz 100W RF Power Amplifier
VK3BRZ
This article describes the construction of a 100-Watt, 70 cm amateur band linear power amplifier. It is the result of a protracted period of experimentation during which I investigated a number of final amplifier stages from obsolete UHF FM 2-way radios.
EME user guide by IK1UWL
IK1UWL
A complete guide to start operating EME. In this document, that is the result of several years of experimenting, the author summarize the steps to begin on Earth-Moon-Earth communications
An 8x2 Element Array Antenna For 144 MHz
DF3LP
This stacking offers a well known simple phasing technique. All elements can be fed in parallel by open wires provided that they are fed in phase. This can be achieved by twisting the open wire phasing-lines at 180 degrees.
F6GCI propagation
F6GCI
A collection of dynamically produced images based on the daily data of the NOAA Space Weather Prediction Center

Top Amateur Radio Websites – Issue 2133

DXZone
-
0
Top Amateur Radio Websites – Issue 2133

USB Rig Interface
sarcnet
This project is a USB Audio, Serial and PTT interface for rigs that does not directly support digital modes provided by applications such as FLDIGI, WSJT-X and JS8CALL. Plug these interface devices into your Windows or Linux laptop or Raspbian Raspberry Pi and you can send and receive digital tones to/from your rig and automate the frequency and mode control and PTT control.
Dedicated 80m Vertical
M0MCX
A dedicaed vertical antenna for 80 meters band based on a 40 meter vertical experiment
Watching Propagation with FT8 Spots
M1GEO
Monitoring propagarion during the day using FT8 reception reprts to determine openings and quality of propagation
OK1RD Beverage Antennas
OK1RD
A Beverage antenna system consisting of 4 time reversible Beverage antennas in length of 320m each.
Automatic Position Reporting System for HF
sarcnet
A basic introductionto APRS on HF Bands for radioamateurs and how to setup an APRS tracker using Argent Data Systems T3 Mini TNC device, configured and assemble ready for portable operations.
Repair or Replace Electrolytic Capacitors
W6OVP
For low voltage applications, like cathode bypass capacitors, most vintage types have an axial configuration, which is less common today but still available. Electrolytic power supply caps likely constitute the single worst liability in old audio, radio and test equipment. Rap about Electrolytics, Reforming, Chassis-Mount Replacements, Under-Chassis Installation, Rebuilding Capacitors
Beverage switch-box
DB9EX
A home made Beverage system for portable use. The goal was to switch between 4 single Beverage antennas without interfering on the other receiving stations.

Top Amateur Radio Websites – Issue 2132

DXZone
-
0
Top Amateur Radio Websites – Issue 2132

A Simple Spectrum Analyser
G4AON
An home made simple spectrum analyzer project includes pictures and diagram.
The G4AON SSB Transmitter
G4AON
This transmitter covers the 160, 80, 40 and 20 metre bands and provides both SSB and properly generated CW. The CW side of this transmitter is not compromised and produces excellent CW. On SSB the audio has been tailored to provide a rising response to 3 KHz, with a sharp drop above that frequency. There is RF speech clipping to both provide more “punch” and to limit the peak output.
Transformers for low-bands antennas
IN3OTD
Transformers can be used as part of a hybrid combiner or as phase inverters for an RX antenna array.
Speech synthesiser for FT-817
sarcnet
This construction project is for anyone wanting to give this popular little radio a voice of its own. This Speech synthesiser reads out the current frequency, mode and menu settings whenever they are changed via the front-panel controls
Building a VHF Contest Station
W5ZN
Building an amateur station for competitive radiosport involves a number of critical steps, regardless of the band or bands you focus on. These include, but are certainly not limited to: Station layout, Equipment interconnection and switching, Inter-station interference, Antenna selection. Radio interface with the logging program, CW and voice keyer integration, Rotator control
N-Type Connector on Cellflex Cable
KK4ICE
Installation of Female N-Type Connector on 1-5/8 RFS Cellflex Cable
Operating AMTOR
G4AON
Putting one of those old modems back into use.AMTOR is an acronym for AMateur Teleprinting Over Radio and was mostly used on HF. The mode is based on the marine SITOR code that was introduced to amateur radio by Peter, G3PLX. The mode is an enhancement of RTTY with active error correction that copes reasonably well with interference and fading.

Top Amateur Radio Websites – Issue 2131

DXZone
-
0
Top Amateur Radio Websites – Issue 2131

Slot-Cube Antenna for 6 Meters
W6NBC
Slot cubes are folded skeleton slot antennas with widened, folded dipoles bent into a cube to reduce size. QST Article 12 2019
Midway Electronics
Midway Electronics
Midway Electronics supplies the area with electronic components, wire, cables, amateur radio transceivers, QRP kits, CB transceivers, GMRS radios, Shortwave radios, power supplies, antennas, coax, connector and ham radio accessories
Audio CW Filter
g4aon
An home madek Audio CW Filter made simply using SMD Components
Hermes-Lite SDR Project
IN3OTD
The author has build the Hermes-Lite SDR v1 and v2 versions describing with a very accurated text and picture the process. Additionally has documented measurements for each component
600W LDMOS Power Amplifier
HG7AN
A comeplete home made 600W LDMOS RF power amplifier. Settings can be made on a 7-inch touch screen, and on this screen you can see a lot of useful information during operation, such as output power, temperature, SWR, and so on. The power amplifier includes 2 MRF300 LDMOS FETs and several built-in sensors. The amplifier also contains several types of protection functions like too high current, too high swr, too high temperature, etc.
Alinco DR-605 Microphone Cable Repair
KK4ICE
Repairing the RJ45 plug end of the mic cable of a Alinco DR-605 dual band mobile transceiver. Alinco microphones are well known for the cable jacket getting brittle and breaking
Interfacing Yaesu DR-1X Repeater
KK4ICE
Instructions and Diagram for Interfacing the STM32_DVM DMR Controller to the Yaesu DR-1X Repeater

Top Amateur Radio Websites – Issue 2130

DXZone
-
0
Top Amateur Radio Websites – Issue 2130

Balcony Dipole Antenna for 20 Meter
VA3ZNW
Antenna may be made practically from any wire (strand, solid) having a reasonable diameter 0.5 2.0 mm (24- 12 AWG). Antenna may be installed at any balcony of 3 to 6 meter length.
Miracle Whip Inspired Antenna Tuner
VK3KBC
There are quite a few variants of the design accompanied with many opinions on the effectiveness of the antenna. This page features links to some similar projects and a homebrewed personalized version of this portable antenna tuner
40m Loop Antenna
sarcnet
This project is a full wavelength, horizontal, loop antenna for the 40 metre Amateur Radio band, built using insulated copper wire in a diamond shape, supported by egg insulators, tethered to 4 masts, each 6.5m high
ADF4351 Signal Generator
CT2GQV
Just a simple signal generator based on ADF4351 module from fleebay allows you to generate one single frequency that can go up or down in 100Khz steps via two push buttons.
160 Meter Radio Propagation Prediction Table
spacew.com
The table above represents a rough approximation of radio propagation conditions on 160 meters. It is based upon selected high-latitude magnetic observatory data which is used to estimate the influence of the auroral oval on 160 meter path propagation
Common-mode chokes Measurements
IN3OTD
Common-mode chokes are useful solutions for RFI reduction. Winding a few turns of coaxial cable on the FT 240-31 toroid can reduced the noise below the received noise floor. In this article author measure different chokes
FT-817 CAT library
CO7WT
Serial CAT interface to control a Yaesu FT-817 transceiver. Inspired in the James Buck (VE3BUX) FT-857D library and crafted to Andy Webster FT-817_Buddy project, but usable by anyone to control a FT-817 radio.
1...161718...83Page 17 of 83

© Copyright 1996-2024 -The DXZone.com

X