Solar physicist Leif Svalgaard of the W.W. Hansen Experimental Physics Laboratory at Stanford University has predicted a maximum sunspot number of 128 ±10, slightly better than Solar Cycle 24.
“The overall average is 132 ±47 (median 124),” he said. “None of these numbers are substantially different, so one could perhaps just go with the ‘wisdom of the crowd.’ All predictions that we consider have the underlying assumption that the sun has not changed its behavior (its ‘spots,’ so to speak) on a time scale of a few centuries (the Maunder Minimum may be a possible violation of that assumption), and that there will be no such changes in the near future, in spite of speculative suggestions.” Those included one of his own in 2013.
Svalgaard characterized the science of solar cycle prediction to be still in its infancy, “borne out by the extreme range of predictions of Cycle 25.” — Thanks to Frank Donovan, W3LPL
source:ARRL
Antenna
160-6m HF VERTICAL ANTENNA, 43ft, 1500W
Get 160-6 Meters Coverage and 1500 Watt Operation with a single antenna! This MFJ-2990 is a 43-foot self-supporting vertical antenna that cover... Read more
An end fed half wave cage antenna. How much wider bandwidth does it provide?
Another comparison between a single wire and a cage arrangement. This time on the end fed half wave antenna. Read more
Three-band portable dipole antenna system
Product Description Band Hopper 3 Multiband Portable HF Dipole Antenna System NEW FOR 2015 – add a high performance balun for just £4.95! At a g... Read more
OptiBeam OB17-4 17 Element 4 Band
4 big monobanders on 1 boom, no traps !!! 3el on 40m / 4el on 20m / 4el wide spaced on 15m / 6el on 10m OptiBeam OB17-4 17 Element, 4... Read more
7el LFA2 Noise comparison on 50 MHz
VA3NCD had the luxury of being able to install 2 50MHz 7el Yagis for testing one against the other. One an M2 7el JHV, the other... Read more
Review
Customizing the Ailunce HD1
Ailunce HD1 Ailunce HD1 Dual Band DMR Digital DCDM TDMA Waterproof Two Way Radio Description: HD1 dual band digital radio uses Digital Mobile... Read more
YAESU FT-991A Colour Screen and Waterfall Demonstration
“We demonstrate the two major new features of the latest version of Yaesu’s “991” series, the FT-991A. Watch the colour screen... Read more
![Xiegu X5105 [ First Video´s]](https://qrznow.com/wp-content/uploads/2017/01/15977553_1934328260128796_9122523868845693855_n-1-265x168.jpg)
Xiegu X5105 [ First Video´s]
X5105 is a highly portable transceiver working at HF+6m band, with a built-in power output of 5W. Technical features: double-conversion superheterody... Read more
![Yaesu M1 – Desktop Microphone [ Video ]](https://qrznow.com/wp-content/uploads/2017/01/m1-265x168.jpg)
Yaesu M1 – Desktop Microphone [ Video ]
Photo by Maggi Luigi IV3YER The Yaesu M-1 is a high-quality, innovative desktop microphone, designed for the discriminating operators. It features co... Read more
“This week I’m reviewing the Openspot by Shark RF. No images to hunt down, It runs D-Star, DMR & Fusion all in one box. Don’t fo... Read more
Equipment
BLA 1000 1KW HF amplifier – RM Italy
RM Italy • Instant use without setup • over 1000 Watts Key-down Output • Instant Bandswitching, no tuning, no warm-up, SWR protected, • Quiet Variable... Read more
IC-9700 Firmware Update
Download Type Firmware Model name IC-9700 Version Version 1.23 Update 2020/04/03 Major changes Changes from Version 1.21 Changed the screen drawing se... Read more
MFJ Catalog 2017
MFJ Catalog 2017 – 21.19 MB Request Print Catalog US Residents ONLY Read more
The new Silphase R1 SDR receiver
Frequency coverage RX 0.1–30MHz Frequency resolution 1Hz Dial step 1Hz to 1KHz Dual VFO Direct sampling 16bit high speed 122 M/s ADC Mode CW, SSB, AM,... Read more
PPG100 Portable Power Generator
Midland Radio has been a show participant at the Consumer Electronics Show for several decades. Long an industry leader in two-way radio technology in... Read more
News
IARU Reports Another Over-the-Horizon Radar System is Under Construction in India
In October, the International Amateur Radio Union (IARU) Region 1 Monitoring System (IARUMS) newsletter reported on the continuing run of over-the-hor... Read more
How well is the VHF Repeater Hearing your Signal?
VHF Repeater “Collin, K0NNK, is having some trouble with is antenna and a nearby repeater. He hit a 2 meter repeater full quieting but the repea... Read more
Dayton Hamvention Expects to be Live Event in 2022
Dayton Hamvention® organizers are planning to mount the first in-person show in 2022, following 2 years of COVID-related cancellations. The event is s... Read more
Big Bright Regions Beckon Amid a Big Aurora Show | Solar Storm Forecast 11.22.2021
“Activity remains subdued this week with only pockets of fast solar wind to bring sporadic aurora to high latitudes, nothing like the G3 show we... Read more
ISS SSTV Dec 1-2 145.800 MHz FM
Russian cosmonauts on the International Space Station (ISS) are planning to transmit Slow Scan TV images on 145.800 MHz FM using the SSTV mode PD-120.... Read more
![Working with the Xiegu X6100 [ Videos ]](https://qrznow.com/wp-content/uploads/2021/11/A_03_1024x1024-2-1-90x60.jpg)
![Working with the Xiegu X6100 [ Videos ]](https://qrznow.com/wp-content/uploads/2021/11/A_03_1024x1024-2-1-180x120.jpg)