Showing posts with label Disasters. Show all posts
Showing posts with label Disasters. Show all posts

Monday, January 26, 2026

Radio Amateurs (HAMS) do not Hinder but Serve their Local Communities in the Southern Cape Area!

Image:  Mobile Emergency Communication Station  (Click on image for larger view.)

The title of the article says it all: Radio Amateurs (HAMS) do not Hinder but Serve their Local Communities in the Southern Cape Area! 

Through the years amateur radio operators has wrongly been identified as Citizen Band (CB Radio) operators that in the eyes of the public serve no useful purpose other than chatting to each other on their radios.  This impressions is far from the truth when it comes to amateur radio operators also called HAMS.  There are more than 3 million people World Wide that practices Amateur Radio.

Incidents where neighbors spot a towering antenna or a mast rising above the rooftop has resulted in complaints being send to the local municipal authority in Mossel Bay.  Some view the towers or masts as a concern and an eyesore while others complain that its obstructing their sea view.  Some even go so far as to claim that is its a health and safety risk and also an unnecessary intrusion on the skyline just to talk to one another.  In this day in age why not use a cellphone to talk to your buddies?  Such complaints are on the increase and it has become necessary to address concerns of the general public even though in some cases the radio amateur lived and erected a tower in the neighborhood long before new entrants moved into the area.  Understandably from an aesthetic standpoint, the profound role these masts and antennas play is overlooked from the point of view by the general public as well as uninformed local authorities.

Far from being a mere hobby or a nuisance, amateur radio operators (HAMS) are licensed guardians of emergency communications and render their skillful knowledge and service to the general public and local authorities during disasters, emergencies, community events etc.  This service is provide free of any charges and all expenses is bared by the radio amateurs themselves.  A free service to the benefit of the local authority and the general public whenever our services are needed.  I will later provide more information on the specific services rendered and also proof of such services being provided in the past.

Anchored in rigorous International and National Regulations, the service that radio amateurs provide is a testament to service, innovation and community protection.  Yes, community protection! (See link below for more information)  

Now this article provides an overview into the regulated world of amateur radio, its vital contribution to the Southern Cape Area safety net and the official endorsements that underscore its value, transforming what might seem like a nuisance and backyard operation to some.  In fact this is far from the truth.  Please read on and you will discover how the best hobby in the world is also the beacon of resilience.

A Regulated Service

Amateur Radio is not only a hobby but also renders a service to the local authorities and community when modern communications fail.  Yes modern communications do fail.  The Knysna Fire 2017 is only one instance where modern communications failed.  Amateur Radio is a formally recognized radio communication service under Local and International law. The International Telecommunication Union (ITU), a specialized agency of the United nations, defines the amateur radio service in it's Radio Regulations as "a radio communication service for the purpose of self-training, intercommunication and technical investigations carried out by amateurs, that is, by duly authorized persons interested in radio technique solely with a personal aim and without pecuniary interest."  This definition, enshrined in Article 1.56 of the ITU Radio Regulations, elevates amateur radio beyond a hobby to a structured discipline with global oversight.

In South Africa, this international framework is implemented through the Independent Communications Authority of South Africa (ICASA).  Established under the ICASA Act and the Electronic Communications Act of 2005, ICASA issues amateur radio station licenses only to those who demonstrate technical competence.  Aspiring operators must pass rigorous examinations covering radio theory, regulations and operating procedures.  Licenses are divided into classes:  Class A (for advanced operators) and Class B (for beginners), with restrictions on power output and frequency bands to ensure safe and interference free operations.

Towers and antennas, often the focal point of neighbor disputes are not erected haphazardly.  ICASA's Radio Frequency Spectrum Regulations 2015 mandate compliance with structural safety standards, including engineering assessments to withstand South Africa's variable weather conditions. 

In many instances by-laws of local authorities does not make provision for radio amateur antennas, masts and towers.  When a complaint is lodged the local authority use old and outdated by-laws.  In some instances antennas and towers are described as structures and building plans must be submitted together with a town planner and structural engineer's certification. Written permission must also by obtained from neighbors. Some authorities rely on by laws regarding the installation of TV Antennas which is then used for installation of amateur radio antennas, mast and towers.  Currently there is no distinction in this regard. This is an omission that seriously hampers the great free services provided by amateur radio to their respected communities.

In many cases complaints rely solely on the visual impact of the antennas and tower and not on the service that amateur radio provides to their local communities.  In other instances amateur radio antennas, masts and towers has been erected long before any by law existed that regulates installations. In one instance a radio amateur erected his tower in 2004 and a neighbor only complained about the tower only 14 years later.  

Don't understand me wrong it is not that we are unwilling to comply or work with authorities and the community when putting up towers.  We need to all work together, provide sound input and representations  to establish clear guidelines and by-laws.  The ideal situation would be that amateur radio antennas and towers be recognized  as essential infrastructure rather then illegal  or that it's visual impact is not acceptable to some. 

Amateur Radio is over a century old, with roots tracing back to the late 19th and early 20th centuries. It originated alongside the birth of radio technology itself, with enthusiasts experimenting with wireless telegraphy as early as the 1890s.  Now that we know how old amateur radio is, it is important to look at some services it rendered in the Southern Cape and South Africa throughout the years.  Unfortunately space only allows for a few examples but I am sure those mentioned here will provide a great overview of the service we provide to our local communities, authorities locally and nationally as well as world wide.

Community Service in Action (Internationally, Nationally and Locally)

Before I provide a few incidents let me point out that there are to many instances where amateur radio saved lives by assisting in providing emergency communications when all else failed or when a distress call is received.  I will only provide a few.  Before continuing I would like to mention that radio amateurs does provide a service that entails many different scenarios.  The instances below does not mean that radio amateurs can only assist in the mentioned incidents.  Some might even be surprised to learn that radio amateurs can provide emergency communications in outer space via satellites should the need arise.  Radio Amateurs can "cater" for any eventuality as they do have all the necessary radio equipment and satellites available to do just that.


Image: Mossel Bay Fire Storm  (Click on image for larger view.)

Now herewith a few past and present events that radio amateurs assisted in:  (Click on the links for more information)

Image: Amateur Radio  Emergency Communications Field Station at St Blaize, Mossel Bay

Local Community Events where Radio Amateurs assist with communications:

Above is only a few incidents / events in which amateur played a important roll in providing services to the community and assistance during disasters.  I am sure many will agree if it was not for radio amateurs and their equipment many lives, homes and animals would have been lost on land and sea.

Health and Safety Concerns

Members of the public living near radio amateurs often express their concern about health risks when amateur radio operators transmit (Electromagnetic Fields aka EMF) RF using their radios. Amateur radio installations are governed by stringent safety standards.  ICASA adopts exposure limits from the International Commission on Non-Ionizing Radiation Protection (ICNIRP)  which align with the World Health Organization (WHO) recommendations.

WHO's extensive reviews included over 25 000 studies, conclude that low-level EMF from amateur radio poses no confirmed health  risks.  Radio amateurs are trained to evaluate their stations using tools like the FCC's RF exposure guidelines, adapted locally to avoid interference with aviation, broadcasting or emergency services.  In practice most amateur radio setups operate well below these thresholds, far safer than everyday devices like cell phones.

Official Recognition:  A Global and National Endorsement

Amateur radio's role in disaster response is officially recognized by the United Nations.  The ITU under UN auspices highlights amateurs in emergency telecommunications, noting their ability to provide voice, text, digital and data links in remote or devastated areas.  The United Nations Office for Disaster Risk Reduction (UNDRR) cites amateur radio as a resilient method for risk reduction, integrated into global strategies like the Sendai Framework.

In South Africa the South African Radio League (SARL= National Body for Amateur Radio in South Africa) collaborates with ICASA and provincial disaster management / agencies to embed amateur networks in emergency plans in all provinces. These partnership underscores amateurs as a "force multiplier" in crises as per United Nations guidelines.

More than Towers / Antennas:  Equipment of readiness and hope

Those amateur radio antennas and towers are not vanity projects but lifelines.  In the Southern Cape Area devastating fires, floods, wind storms and even earthquake risks, they represent not only preparedness but a necessity when disasters or emergencies occur.  The neighbor decrying a tower and antennas might one day rely on it for a distress call when all other means of communications fails. The Knysna Fire in 2017 is a reminder in this regard where it was reported:  “A major problem fighting the massive fires that ravaged Knysna  was the lack of communications and electricity outages"

Conclusion:  Embrace Radio Amateurs as they are the Guardians of the Airwaves

Radio Amateurs do not hinder communities - they fortify and assist their communities.  Under ITU and ICASA oversight, with the SARL's guidance and UN endorsement they embody regulated volunteerism and Ubuntu.  The next time a tower or mast graces the Southern Cape Area see it as a symbol of service; metal and wire woven into the fabric of safety and solidarity.  By supporting Radio Amateurs we invest in our collective resilience.

In the final analysis, while amateur radio have a storied past, the future looks even brighter. The fusion of traditional knowledge with contemporary innovations is set to usher in a golden era for
amateur radio. In the realm of crisis communication, amateur radio remain, as ever, a stalwart ally, poised to play an even more pivotal role in the future.

AMATEUR (HAM) RADIO IS THE ONLY FAIL SAFE COMMUNICATION SYSTEM IN THE WORLD!

Images:  Past and present events where amateur radio assisted communities in need.  (Click on images for larger view.)



















 

ED.  This article would not have been possible without the contribution by many fellow radio amateurs, news papers, HAMNET  and the Internet.  To many to mention individually.  I do not claim in any way to be the owner of any of the content and information.  In my humble opinion it belongs to Amateur Radio.  All the inputs are highly appreciated.

Sunday, January 25, 2026

Down Memory Lane: Amateur Radio and the Laingsburg Flood ( Sunday, 25 January 1981)


Image:  Laingsburg Flood  (Click on image for larger view.)

Today 45 years ago on 25 January 1981 the Laingsburg Flood occurred. 104 people died in the incident. Read more in the attached article that I wrote about the Laingsburg Flood after receiving a request from several schools who wanted to use it as an assignment. Amateur Radio also played a vital role during the Search and Rescue mission. See the photo beneath. 

THE LAINGSBURG FLOOD - 25 JANUARY 1981 (PDF 5 MB Download)

Amateur Radio assisted in establishing vital communications with the outside world.


“The memories will remain with those who witnessed and experienced this disaster” 


Friday, January 16, 2026

Destructive Fire destroy and damage homes, cars and wild-life in Mossel Bay (5 - 10 January 2026)


2026 was off to a fiery start in Mossel Bay in the Garden Route with various fires gutting homes, destroying vehicles and vast tracts of prime land and fynbos. The fire that started in open veld next to the N2 and spread to several areas as listed in the image below.

During the period 5 - 12 January 2026 the ZS Link Network Amateur Radio Group kept abreast of the fire and all related developments via WhatsApp Group and live Amateur Radio Nets in the event that amateur radio emergency communications were called upon.  Another first is that the fire fighters were supported by OM Jan ZS1CBS, a radio amateur and farmer who assisted in fighting the fires with his own fire fighting equipment.  Well done to Jan and a big thank you for assisting our community in times of need!!  (See images below)


The fire in Aalwyndal, Vakansieplaas, Island View and surrounds saw an enormous outpouring of solidarity – it was a tenacious community against a raging fire. Special thanks to the neighbourhoodwatch groups (Community Policing Forum), NSRI and the farmer’s associations from all over the greate Mossel Bay.
On the afternoon, 8 January 2026, when numerous flare-ups occurred due to persistent, strong and ever-changing winds, threatening adjacent areas like Sonskynvallei, Hartenbos Heuwels, Renosterbos and Num Num - more than 30 bakkies and small trailer tenks with water were, as well as trucks with water tanks were deployed. Here are some of the videos of the volunteers who added tremendous value to the firefighting effort.

Hannelie Marias, Chairperson of the Da Gamaskop Community Policing Forum writes (translated from Afrikaans):  “𝐼𝑡’𝑠 𝑢𝑛𝑏𝑒𝑙𝑖𝑒𝑣𝑎𝑏𝑙𝑒 ℎ𝑜𝑤 𝑝𝑒𝑜𝑝𝑙𝑒 𝑐𝑎𝑙𝑙 𝑎𝑛𝑑 𝑎𝑠𝑘, ‘𝑊ℎ𝑒𝑟𝑒 𝑑𝑜 𝐼 𝑓𝑖𝑙𝑙 𝑢𝑝 𝑤𝑖𝑡ℎ 𝑤𝑎𝑡𝑒𝑟?’ 𝐴𝑛𝑑 𝑡ℎ𝑒𝑦’𝑟𝑒 𝑜𝑓𝑓! 𝑇ℎ𝑒𝑦 𝑑𝑟𝑖𝑣𝑒 𝑤𝑎𝑡𝑒𝑟 𝑜𝑢𝑡 𝑎𝑛𝑑 𝑝𝑜𝑠𝑖𝑡𝑖𝑜𝑛 𝑡ℎ𝑒𝑚𝑠𝑒𝑙𝑣𝑒𝑠 𝑎𝑡 𝑠𝑡𝑟𝑎𝑡𝑒𝑔𝑖𝑐 𝑝𝑜𝑖𝑛𝑡𝑠 𝑠𝑜 𝑡ℎ𝑎𝑡 𝑡ℎ𝑒 𝑏𝑎𝑘𝑘𝑖𝑒𝑠 (𝑝𝑖𝑐𝑘𝑢𝑝𝑠) 𝑤𝑖𝑡ℎ 𝑎 𝑠𝑢𝑏𝑚𝑒𝑟𝑠𝑖𝑏𝑙𝑒 𝑝𝑢𝑚𝑝 𝑎𝑛𝑑 𝑚𝑜𝑡𝑜𝑟 𝑡𝑜 𝑠𝑝𝑟𝑎𝑦 𝑤𝑎𝑡𝑒𝑟 𝑐𝑎𝑛 𝑗𝑢𝑠𝑡 𝑟𝑒𝑓𝑖𝑙𝑙 𝑎𝑛𝑑 ℎ𝑒𝑎𝑑 𝑏𝑎𝑐𝑘 𝑖𝑛𝑡𝑜 𝑡ℎ𝑒 𝑓𝑖𝑒𝑙𝑑. 𝑌𝑒𝑠𝑡𝑒𝑟𝑑𝑎𝑦, 𝐼 𝑚𝑦𝑠𝑒𝑙𝑓 𝑚𝑎𝑛𝑛𝑒𝑑 𝑎 𝑓𝑖𝑟𝑒 ℎ𝑦𝑑𝑟𝑎𝑛𝑡 𝑜𝑛 𝑡ℎ𝑒 𝐴𝑎𝑙𝑤𝑦𝑛𝑑𝑎𝑙 𝑅𝑜𝑎𝑑. 𝑇ℎ𝑒 𝑚𝑒𝑛 𝑠𝑡𝑜𝑝, 𝐼 ℎ𝑎𝑛𝑑 𝑡ℎ𝑒𝑚 𝑡ℎ𝑒 ℎ𝑜𝑠𝑒 𝑎𝑛𝑑 𝑜𝑝𝑒𝑛 𝑡ℎ𝑒 ℎ𝑦𝑑𝑟𝑎𝑛𝑡. 𝑇ℎ𝑒𝑦 𝑎𝑟𝑒 𝑒𝑥ℎ𝑎𝑢𝑠𝑡𝑒𝑑, 𝑤𝑜𝑟𝑛 𝑜𝑢𝑡. 𝐴𝑔𝑎𝑖𝑛, 𝐼 𝑠𝑡𝑜𝑜𝑑 𝑖𝑛 𝑡𝑒𝑎𝑟𝑠 𝑏𝑒𝑐𝑎𝑢𝑠𝑒, 𝑤𝑖𝑡ℎ 𝑡ℎ𝑒 𝑔𝑟𝑒𝑎𝑡𝑒𝑠𝑡 𝑟𝑒𝑠𝑝𝑒𝑐𝑡, 𝑎 𝑦𝑜𝑢𝑛𝑔 𝑚𝑎𝑛 𝑤𝑖𝑡ℎ 𝑎 𝑝𝑟𝑜𝑠𝑡ℎ𝑒𝑡𝑖𝑐 𝑙𝑒𝑔—𝑦𝑒𝑠—𝑐𝑙𝑖𝑚𝑏𝑠 𝑜𝑢𝑡 𝑜𝑓 𝑡ℎ𝑒 𝑏𝑎𝑘𝑘𝑖𝑒, 𝑐𝑙𝑖𝑚𝑏𝑠 𝑜𝑛𝑡𝑜 𝑡ℎ𝑒 𝑡𝑟𝑎𝑖𝑙𝑒𝑟 𝑤ℎ𝑒𝑟𝑒 𝑎 𝑤𝑎𝑡𝑒𝑟 𝑡𝑎𝑛𝑘 𝑖𝑠 𝑚𝑜𝑢𝑛𝑡𝑒𝑑, 𝑎𝑛𝑑 𝑜𝑝𝑒𝑛𝑠 𝑡ℎ𝑒 𝑡𝑎𝑛𝑘 𝑙𝑖𝑑. 𝐻𝑒 𝑚𝑢𝑠𝑡 ℎ𝑎𝑣𝑒 𝑐𝑜𝑚𝑒 𝑡𝑜 𝑟𝑒𝑓𝑖𝑙𝑙 𝑎𝑡 𝑡ℎ𝑒 𝑤𝑎𝑡𝑒𝑟 𝑝𝑜𝑖𝑛𝑡 𝑎𝑡 𝑙𝑒𝑎𝑠𝑡 10 𝑡𝑖𝑚𝑒𝑠. 𝑁𝑜𝑤 𝑡ℎ𝑒𝑠𝑒 𝑎𝑟𝑒 𝑡ℎ𝑒 𝑠𝑡𝑜𝑟𝑖𝑒𝑠 𝐼 𝑤𝑎𝑛𝑡 𝑡𝑜 𝑡𝑒𝑙𝑙.”

Videos:  Mossel Bay Advertiser and EWN 

 


 

𝗨𝗣𝗗𝗔𝗧𝗘 – 𝗛𝗨𝗠𝗔𝗡𝗜𝗧𝗔𝗥𝗜𝗔𝗡 𝗔𝗜𝗗 - 12 Jan 12:25 🙏 THANK YOU, Mossel Bay! Your generosity during the Aalwyndal, Vakansieplaas & Island View fires has been overwhelming. Crews are no longer stationed in the fire zone, but remain on alert for flare‑ups. 🚫 No more perishables accepted – the active operational period has ended. 🧴 Toiletries & household items still welcome (see list below). 💳 Financial contributions remain open to support affected families. Drop‑off: Generosity, 3 Watson Street, Voorbaai Donate online: edenprotocol.co/mossel-bay-fire-relief 🧴 Needed Items * Soap, facecloths, toothpaste, toothbrushes * Shampoo, conditioner, roll‑on, spray * Sanitary towels, lotion/aqueous cream * Razors, hairbrushes, combs * Toilet paper, washing powder, fabric softener * Handy Andy, bleach/Domestos, dishwasher liquid * Washing pegs, scourers, broom, mop, dustbins

Images:  Robert Crous + Mossel Bay Advertiser (Click on images for larger view.)

 



Images:  Working on Fire, Kishugu Aviation and Mossel Bay Advertiser  (Click on images for full view.)









Images below:  Jan ZS1CBS, Radio Amateur and Farmer getting his fire fighting  equipment ready before moving in to fight the fire which at that stage was threatening the Hartenbos Heuwels and other areas.  Jan, thank you for the community service you provided free of charge.




Images and video below:  The editors son also assisted in fighting the fire after his normal daily work schedule.  Thank you son for the service that you rendered to the Community of Mossel Bay!


 


End.

Thursday, November 27, 2025

Large Wildfire threatened Danabay near Mossel Bay!! (26 November 2025)

Image: Danabay Fire - Gerrit ZS1KLO (Click for larger view.)

During the Sonsakspan Net on the 26 November 2025 at 16h30 the following interesting question was asked by Jacobus ZS1JDJ.

What impact does ash, smoke and flames have on radio communications while a veld fire is burning?

Danie ZS1DL reported that there was a lot of interference on his radios while the emergency personal attended to the fire and other incidents. 




Videos:  Provided by Danie ZS1DL

Herewith a short explanation:

Wildfire ash and the associated smoke and flames can significantly impact amateur radio signals

Wildfire ash and the associated smoke and flames can significantly impact ham radio signals by causing signal attenuation and refraction, particularly at higher frequencies like VHF and UHF. The effect is dependent on the density and chemical composition of the smoke/ash, and the frequency band used. 

Effects on Radio Signals

  • Signal Attenuation: The primary effect is a degradation of signal strength. Smoke and ash contain particulate matter (like graphitic carbon and potassium) and ionized gases (plasma) that can absorb or scatter electromagnetic waves.

  • Frequency Dependence: Higher frequencies (UHF and above, such as 70cm amateur bands, Wi-Fi's 2.4 GHz, and cell signals) are generally more affected by the particulate matter than lower frequencies (VHF and HF bands).

  • Refraction and Ducting: The intense heat from a wildfire creates a "thermal bubble" or "thermal lens" in the atmosphere, leading to temperature inversions and changes in the air's refractive index. This can sometimes cause unexpected signal bending (refraction) and even enhance long-distance propagation (tropospheric ducting) in certain conditions, where radio waves bounce further than normal.


    What is a Thermal Bubble?

    A thermal bubble is a concept used to describe a buoyant mass of hot air and emissions that rises from an intense fire. 

  • Formation: Continuous heating of the surface air mass by the fire causes the air to bulge upwards into a "bubble". The intense heat creates strong thermal buoyancy, making the air less dense than the surrounding cooler air.

  • Ascension: Eventually, this hot air mass can break away from the surface and ascend into the atmosphere as a distinct cell.

  • Atmospheric Dynamics: As the thermal bubble rises, cooler air from aloft moves downward to replace the ascending warm air, initiating a circular motion or horizontal roll vortices at the edges of the plume. This process is part of the formation of a pyrocumulus cloud (fire cloud) and is most prominent in strong vertical wind profile environments. 


    Image:  Pyrocumulus cloud, or fire cloud - Wikipedia

         What is a Thermal Lens? 

A "thermal lens" in the context of wildfires
refers to the atmospheric distortion caused by a fire's heat, which can negatively impact radio communications. The intense heat creates a "thermal bubble," which acts like a physical lens, bending radio waves and causing signal degradation. This phenomenon requires specialized communication strategies and technologies for effective firefighting and operational coordination during a wildfire. 

How it works
  • Atmospheric distortion: Wildfire heat creates a plume of hot air, smoke, and debris, which alters the air's density and refractive index.
  • Radio wave bending: This change in the atmosphere causes radio waves to bend or refract, similar to how a glass lens bends light.
  • Signal disruption: The bending can cause the signal to be weaker, distorted, or lost entirely, making it difficult for emergency responders to communicate using standard equipment.
Impact on radio communications
  • Coverage gaps: Areas directly under or near the plume experience significant radio dead zones.
  • Interference: Other radio signals can interfere with one another, leading to unreliable communication.
  • Operational challenges: Firefighters need to have a backup plan, such as using different radio frequencies, satellite phones, or establishing direct line-of-sight communication.
Solutions and strategies
  • Specialized equipment: Firefighting agencies often use specialized radio equipment that can better penetrate or adapt to the challenging conditions.
  • Backup systems: Relying on multiple communication systems, such as satellite phones and handheld radios, can ensure redundancy.
  • Strategic planning: Planning for the thermal lens effect is crucial. This includes identifying areas likely to be affected and developing contingency communication plans.
  • High-frequency radios: Some high-frequency radios are less affected by atmospheric conditions and can provide more reliable communication over longer distances.
Radio Operations During Wildfires


Image: The illustration above shows high altitude troposheric ducting - VK3SF.

Despite these challenges, amateur radio operators play a vital role in emergency communications during fire events, often filling in when traditional cellular or landline infrastructure fails. They adapt their operations by: 

  • Utilizing lower frequency bands (HF or 2m VHF) which are less susceptible to severe attenuation from smoke than UHF.

  • Employing tactical positioning of antennas to work around dense smoke plumes or terrain features.

  • Leveraging enhanced (though unpredictable) propagation events like tropospheric ducting to make long-distance contacts.

Temperature inversions significantly disrupt radio communications during wildfires by creating
anomalous propagation conditions that can cause signal path loss and unpredictable signal patterns. 

Effects on Radio Communications
  • Signal Trapping and Bouncing: A temperature inversion creates a "lid" of warm air over cooler, denser ground-level air, which traps smoke and pollutants. Radio waves get bounced or "trapped" within this cooler surface layer, leading to signals ricocheting around rather than propagating normally through the atmosphere.
  • Signal Path Loss: The environment created by the fire plume itself and the inversion is "sub-refractive," which can cause significant radio signal path loss, especially over long distances.
  • Unpredictable Behavior: The turbulent, ionized, and smoke-laden atmosphere within and around a fire can cause radio beams to spread out or bend in unpredictable ways, making consistent communication difficult.
  • Increased Range for Some Signals: In some instances, the "sandwich effect" of an inversion layer can cause sound and radio waves to travel further than normal, leading to unexpected signal reception from distant sources, though this is generally unreliable for operational communication within the fire zone.
Operational Impact During Wildfires for Firefighters
 
For firefighters, these disruptions mean that traditional radio communication systems can become unreliable, particularly in valleys or areas where inversions settle overnight. This communication failure poses a significant safety risk during active fire suppression efforts. 

Mitigation Strategies:
  • Situational Awareness: Fire crews are trained to observe and report weather conditions, including signs of an inversion (e.g., low-hanging smoke, hazy atmosphere), to anticipate potential communication issues.
  • Alternative Technologies: Modern approaches utilize technologies that do not rely on traditional, centralized radio infrastructure. Mobile mesh networking, where each device acts as a relay station, creates a more resilient network with no single point of failure.
  • GPS and Situational Apps: Firefighters use smartphones with downloaded maps and situational awareness applications (like ATAK) that use GPS, which functions independently of cellular networks, to maintain awareness of their location and the fire's movement even when voice communication is lost.
Amateur Radio and Wildfires 

Amateur radio is a crucial tool for communication during wildfires because it is independent of traditional infrastructure like cell towers and power grids, providing a reliable backup network. Amateur radio operators can provide vital information to emergency services and the public when other communication systems fail, report fires, coordinate logistics, and even assist in long-range communication for isolated communities. This independence makes them essential for public safety and personal communication in disaster situations. 

Benefits of ham radio for wildfire communication
  • Infrastructure independence: Amateur radio does not rely on the cellular or power grids, so it remains functional even when they are down due to damage or overload.
  • Reliable communication: Operators can communicate directly or use repeaters to extend range, enabling them to report fires, provide status updates, and request assistance.
  • Emergency support: Trained ham radio operators can integrate with official emergency response efforts to provide communications support, as seen with programs like California's Provincial Emergency Radio Communications Service (PERCS).
  • Long-range capability: With appropriate equipment and antennas, ham radios can facilitate long-distance communication, which is crucial for large-scale disasters or reaching remote areas.
  • Sustained operation: Radios are designed for long-term use, making them ideal for extended emergencies where other devices may run out of power.
Examples in practice
  • Reporting fires: An amateur radio operator used his radio to report a wildfire, and within minutes, emergency services were dispatched, a helicopter arrived, and firefighters extinguished the fire.
  • Evacuation support: In the 2017 Mossel Bay Heiderand Fire, radio amateurs helped residents receive timely updates and evacuate safely, even as there houses were under threat.
  • Official integration: HAMNET are officially incorporating amateur radio operators into their disaster plans, training volunteers and establishing radio stations to ensure communication continuity.

 Interesting reading:  Radio Propagation in Fire Environments

Closure of this ZS Link Network Blog - 29 April 2026

This will be the final posting on the ZS Link Network Blog. This blog will no longer be updated but will remain available for research an...