![NVIS: Near Vertical Incidence Skywave [ PodCast ]](https://qrznow.com/wp-content/uploads/2017/11/24180150.jpg)
Sometimes the best direction to send your signal is straight up!
Near vertical incidence skywave, or NVIS, is a skywave radio-wave propagation path that provides usable signals in the range between groundwave and conventional skywave distances—usually 30–400 miles (50–650 km). It is used for military and paramilitary communications, broadcasting,[1] especially in the tropics, and by radio amateurs. The radio waves travel near-vertically upwards into the ionosphere, where they are refracted back down and can be received within a circular region up to 650 km from the transmitter.[2] If the frequency is too high (that is, above the critical frequency of the ionospheric F layer), refraction fails to occur and if it is too low, absorption in the ionospheric D layer may reduce the signal strength.
There is no fundamental difference between NVIS and conventional skywave propagation; the practical distinction arises solely from different desirable radiation patterns of the antennas (near vertical for NVIS, near horizontal for conventional long-range skywave propagation).
Antenna
Radiowavz Sentinel Expedition
“Hope (KM4IPF) talks about the Radiowavz Sentinel Expedition Hex Beam that she and her siblings have been using. They have come up with a few ti... Read more
Long Range Wi-Fi Dish Antenna by AB9IL
Long Range Wi-fi Dish Antenna THIS INEXPENSIVE WI-FI DISH ANTENNA OUTPERFORMS ALL OTHERS! Presented here is a project showing how to convert common sa... Read more
The Cycle Buster – New HF Dual Antenna M2 !
The 40-20M-3-5 is a coil loaded 40 meter 3 element Yagi interlaced with a 20M 5 element Yagi. This antenna is the perfect package to bust the sun spot... Read more
Multi Band QRP Antenna – 40-30*-20-10
QRP DX 40-10 POWER 100w SSB 25w CW The Radio Wavz QRP DX is ideal for those who need to be on the go. Those who want a low profile high performance an... Read more
OMNI-TILT™ Vertical Antenna Tilt Bases DXE-OMNITILT-2P
DX Engineering OMNI-TILT™ Vertical Antenna Tilt Bases are a completely new design that incorporates features that make this Tilt Base a ‘must ha... Read more
Review
6 Meter/50mhz Magnetic Loop For FT-8 And More
Here is a 6 meter magnetic loop that I purchased from Bob, VE3UK. It is precision CNC made and developed by Bob himself. All aluminum, at 18 inches an... Read more
External Mic and PTT for the Elecraft KX2 & KX3
Elecraft KX3 & KX2 are excellent radios for handheld portable HF operation. Elecraft KX2 is the better option for handheld portable HF operation,... Read more
LD-5 HF Ham Radio QRP Transceiver – Tech Review
The LD-5, made in USA, by LNR Precision Inc. is an amazing little 5 band SSB/CW Amateur Radio QRP Transceiver that’s small and light enough to... Read more
Expert Electronics MB1 – Software and Firmware update
Expert Electronics MB1 In this video I demonstrate how to update your Expert Electronics (SunSDR) MB1, for both software (ExpertSDR2) and firmware (as... Read more
Building an Ultra Portable Go-Box
LUITON LT-898UV Dual Band Mobile Main features: 1. Dual band: 136-174MHz/400-470MHz/245MHz (Receive only) ; 2. Dual Reception/Dual Display ; 3.... Read more
Digital Modes
WSJT-X Version 2.0.0-rc1 Released – Download FT8
Go to New Features in WSJT-X 2.0 for a detailed description of its new features. Further technical information (primarily of interest to programmers)... Read more
On-the-Air Test of New FT8 “DXpedition Mode” Set for Early March
A second beta version of WSJT-X version 1.9.0 has been released, the WSJT development group announced this week. The “release candidate,” as it’s call... Read more
FT8 is exploding! – No Nonsense Amateur Radio Podcast #6
FT8 is exploding! 1#popular HamRadio digital mode In this episode of the No Nonsense Amateur Radio Podcast, Tom, KB5RF, and I explore... Read more
MFJ-1204 – USB TO RIG SC INTERFACE, W/8-PIN DIN,DATA/ACC PORT
MFJ-1204 Includes radio interface cable (8-PIN DIN) Sign up for the digital revolution and explore a whole new world of amateur radio excitement using... Read more
New Digital Mode FT-8 Ham Radio Digital Mode for the Fast & Furious!
Here’s a short demonstration on the new digital mode FT-8 developed by K1JT & K9AN. Part of the WSJT-X software suite. We’ll go over h... Read more
Equipment
The Leopard Military Radio – 1.6 – 170 MHz
THE LEOPARD is a compact, rugged and lightweight wideband military radio which offers uncompromised communication for tactical missions in the... Read more
METROPWR FX775 – VECTOR POWER/SWR METER
METROPWR FX775, is a modern VECTOR POWER/SWR METER completely digital. It’s composed of a wattmeter and a power coupler for measurements up to 3/5kW. ... Read more
![AMPTEC LA4000 HF Power Amplifier – 4000 W [ VIDEO ]](https://qrznow.com/wp-content/uploads/2016/10/s-l1600-6-190x122.jpg)
AMPTEC LA4000 HF Power Amplifier – 4000 W [ VIDEO ]
AMPTEC LA4000 HF Power Amplifier , designed for use on all short wave amateur bands from 1.8 to 29.7 MHz , including WARC bands and all modes. It is e... Read more
PowerMaster II Station Monitor, VSWR & RF Power Meters
The PowerMaster II from the Labs of Array Solutions A Wattmeter that is Outstanding in Functionality with NIST Traceable Accuracy Some... Read more
Ailunce HS1 HF SDR HAM Transceiver
Ailunce HS1 Description: Spectrum Dynamic Waterfall Display Multiple Working Modes：Receive Mode, Transmit Mode, TUNE Mode, VFO Mode, SPLIT Mode DSP Di... Read more
