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Receiving every signal is not always a good thing — especially when you receive them all at once! The Doctor describes why proper filtering is important. |
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VHF
Radioddity DB25-D – Tiny Mobile DMR Radio
The DB25-D is an interesting DMR radio. It is more powerful than a hand held radio and only partially bigger, but you don’t get to the full 50 w... Read more
TYT SW-102 VHF / UHF SWR METER WITH RF POWER METER AND FREQUENCY COUNTER
VSWR. Forward and reflected power direct digital readout, without any calibration. Maximum measurable power range up to 120W. low insertion loss (0.3... Read more
University in Poland will Launch Balloon with VLF Transmitter On Board
A balloon experiment by Warsaw University of Technology is planned to lift off on September 12, carrying a unique very-low-frequency (VLF) 210-meter l... Read more
DB-750X Dual Band VHF/UHF 750 Channel Commercial Mobile Radio
DB-750X Description All of the features you want at an affordable price. The newest mobile added to the Powerwerx lineup features Narrow band transmi... Read more
Dual band Portable Amplifier TC-VU50 ( VHF and UHF )
Product Description Frequency 136-174 and 400-480MHz (Any 10MHZ frequency space or frequency point selectable,such as VHF: 140-150mhz&UH... Read more
Chance to win a brand new Boxchip S700A !
Network-radios.com and Boxchip created this amazing campaign! The S700A is a hybrid android radio that allows 100% coverage: via 3G/4G/LTE/WiFi/VHF or... Read more
Review
Unboxing and Testing the Yaesu FT-891 : Ham Radio 2.0: Episode 67
Yaesu‘s newest HF mobile radio has some cool new features, but leaves out other options of its predecessors. Let’s take a look at the radi... Read more
What makes a good portable CW paddle?
Richard G3CWI of SOTABEAMS has released a 3 minute video looking at the differences between a paddle designed for portable use and a fixed-station pad... Read more
Elecraft K4 Hands-on (UK Sample)
Elecraft K4 Peter Waters G3OJV, takes a trip around the features he used when evaluating the first production sample K4 to arrive int the UK. OVERVIEW... Read more
Equipment
CW Decoder – Inac
decoder translates and displays the tones of a telegraph or teletype signal on a display of alphanumeric characters. Only required to run a connection... Read more
Ultra Wide-band Coverage SDR Receiver MK3
Ultra Wide-band Coverage SDR Receiver MK3 • Full coverage reception form 100KHz to 2GHz SDR • Independent antenna inputs for Shortwave and VHF • USB c... Read more
Daiwa SWR & POWER METER CN-101L
Daiwa SWR & POWER METER CN-101L FREQUENCY：1.8～200MHz POWER RANGE：15/150/1500W INPUT CONNECTORS ：M SWR and Power indicators are insta... Read more
Kenwood TS-480HX / 480SAT
Kenwood TS-480HX / 480SAT Tailor-made for DX’ing, the new TS-480HX HF transceiver raises the bar on portable performance. Despite its com... Read more
Wideband RF Switch (5 – 3000 MHz)
Photo: Aditya Mukherjee In an application it was required to use 6 different antennas at 6 nearby locations one at a time as the Bluetooth/WiFi antenn... Read more
Rotator Genius – 4O3A
Rotator Genius is a smart rotator controller that uses a magnetic sensor for reading azimuth. It can be controlled by a Windows or Android app. Motor... Read more
Antenna
W1ZR Wins August QST Cover Plaque Award
The winning article for the August 2016 QST Cover Plaque award is “Antenna Analyzers — the Basics” by Joel R. Hallas, W1ZR. The QST Cover Plaque... Read more
Log Periodic Antennas – “ARRL The Doctor is In” podcast. Listen…and learn!
These directional antennas may look like Yagis, but they are quite different. The Doctor explains! Read more
Electromagnetics, the W8JK Antenna, and the ‘Wow!’ Signal
Electromagnetics, the W8JK Antenna, and the “Wow!” Signal Or, “My friend, the Ohio State Professor, Dr John Kraus, W8JK” Bob HoufK7ZB Antenna enthusia... Read more
Arduino Mega2560 based Antenna Rotator Controller
by Vinod Es “Well after a long time I am back with a new project ! This is an attempt to build an Antenna rotator controller using Arduino Mega... Read more
JK Mid-Tri-40 2 Elements on 40M / 3 Elements on 20M/ 4 Elements on 15M / 5 Elements on 10M / 26 Foot Boom
The JK Mid-Tri has been designed for Hams looking for a Mid level, cost effective but high quality Tribander antenna. This Tri-Bander’s... Read more
A Simple Wire Tuner
Here’s a basic, but effective and efficient, antenna tuner for feeding random wires, especially half-wave end-fed wires. Read more
