Antenna Handbook

What is eero home wifi system ?


eero is smart wifi system that replace traditional wifi router, wifi extender and internet booster in One device eero system . eero works with eero TrueMesh Software App. 


Unlimited Mesh 
With TrueMesh, WiFi hops between eero devices to travel down hallways or go around walls. Most other WiFi systems only allow for one hop in any direction — so something as simple as a wall can mean that your devices can’t get the WiFi they need. eero allows for more hops with less speed degradation — so you can cover any home and navigate around any obstacle.

Solving Congestion


















TrueMesh technology knows the signal strength between each eero in your home and calculates the best path from your device to the internet. If there’s a disruption on any part of your network — like if a pet knocks a Beacon out of the wall — TrueMesh dynamically reroutes traffic to keep it balanced. All this happens in the background so you don’t notice a thing.

Automatic Software updates
Normal routers require you to proactively install security patches — but let’s be honest, most of us never do that. eero automatically updates its encryption and security protocols to protect your network from the newest threats. You always have the latest features and security.

Control at Your Smartphone
With WiFi App by installing TrueMesh App,your network speed, which devices are connected and make sure each eero working properly.  you can control all the eero function with your Smart Phone, works with Alexa, Amazon WiFi

Placing Additional eero


The eero app walks you through placing additional eero devices in your living room, bedrooms, kitchen, or hallways to bring WiFi to every inch of your home.

Optimize Your Home

From when your start activated eero,  eero TrueMesh software begins learning from and optimizing for your space, devices, and network usage. So every device gets a reliable connection all the time, everywhere in your home.

eero come with 3 type :

eero is WiFi router and extender, and covers area up to 1,500 sq.ft

is tri band WiFi Router and Extender by cover area up to 1,750 sq.ft


is WiFi Booster for expand your wireless coverage capability up to 1,500 sq.ft

With 3 pack eero as technical spec from eero, you can get covers area up to 5,000 sq.ft , this suitable for common house in America and Canada.
You can change the eero  by mixed it as your coverage needs. 

For example if you have house with 3000 sq.ft , you need 1 eero and 1 eero Beacon, or 1 eero Pro, and 1 eero Beacon.

DIY Six Stage Attenuator for High Frequency HF

If you have to deal with radio frequency more than very rarely, it is helpful if you can easily weaken the signals in discrete steps. 

So you can e.g. Bring the output signal of an HF generator to a different level than would only be possible with the generator's adjuster. 

There are many applications for a concealer when comparing or repairing receivers or with radio devices. Unfortunately, professional attenuator are quite expensive. 

Doing it yourself is worthwhile here because expensive electronics are not required
The Circuit Diagram of Six Stage Attenuator from Elektor Elektronic July Edition 2017 in Germany language 

Circuit Diagram


PCB Lay Out

Final Six Stage Attenuator Prototype with aluminum case








With Six Stage Switches for 0..31 dB in 1 dB Step
Prototype Final

Frequency Response 0....-31 dB



Radio Straight or Crystal Radio for Science Project or Hobbyist



OA70 / IN34 / IN60 is Germanium Radio, choose only one type.
Antenna high from Ground is high is possible, ground is a must to Steel Water pipe, or making one from a piece of copper approximately 1 meter down to the ground, so will be voltage between ground and radio wave pick up by antenna.

I have build this Radio and connected input speaker to line input notebook and running with Open Lab software and can pick up Radio Signal from about 6 km air distance.

====+  Parts List for   +====

10 nF                              1   Capacitor


VC 500 pF                      1   Variable Capacitor


OA70/IN34/IN60             1


 GND                               1   GND
Termination Ground

108 Turns,12 Turns        L Tap between 108 Turns and 12 Turns

8-2000 Ohm  1   SPKR or Earphone 8 - 2000 Ohm , you can get this in junk shop or at ebay.com

RF Connector Male and Female For Antenna Connection
 

50 Ohm Coaxial cable for Antenna


Electronic Project Box


Antenna for LW,MW,SW and AM 

Sun Switch With Transistor 2N3055



2N3055 is Power Transistor and Amplifier Transistor for General Purpose and can act as Photo Transistor by cutting the "hat cover" of this transistor. This photo transistor function of 2N3055 can be taking the advantage as switching function with transistor. This circuit using 2 transistor which is 2N3055 and BD139. If there is no sun light or the light is not enough for Transistor 2N3005 to deliver, so R1 will give current to TR2 BD139 ,and this transistor will turn on Lamp on the Output of Circuit.








If The Sun Light which flows to "hat cover" of TR1 2N3055 enough, TR1 will deliver and will grounded Base of TR2 BD139 and will Turn Off The Lamp.R2 and P1 will improve switching system of the Transistors and The Light of Lamp Intensity could be regulated by P1.


At the below figure is Stripboard or Veroboard for the circuit. This Veroboard using DIY LC software. 

Parts Lists of Components :
Transistor TR1 2N3055

Transistor TR2 BD139

  
Resistor R1 4K7
Resistor R2 10K
Trimmer Resistor P1 1M
Lamp 9 V / 400 mA
Battery 12 V and Case battery
 

Universal PCB
  
Box  for the Circuit

The Optimized Wireless Charging Stand for you !

PowerWave Stand
The Optimized Wireless Charging Stand
Versatile Viewing
Twin charging coils let you watch videos in landscape orientation, or stand in portrait mode for web browsing and facial recognition—all while keeping the power flowing.
Just in Case
Don’t worry about taking your case off whenever you have to charge. PowerWave delivers charging power directly through cases up to 5 mm thick—including Otterboxes.
Input: 5V-2A / 9V-2A
Output: 5W / 10W
Compatibility:
10W Fast Charge Mode: (Using Quick Charge 2.0/3.0 Adapter)
  • Samsung Galaxy S10 / S9+ / S9 / S8 / S8+ / S7 edge / S7 / S6 edge+
  • Samsung Note 10 / Note 9 / Note 8 / Note 7
5W Standard Charge Mode: (Using 5V/2A Adapter)
  • iPhone 11 / 11 Pro / 11 Pro Max / XS Max / iPhone XR / iPhone XS / iPhone X / iPhone 8 / 8 Plus
  • All other Qi-enabled phones and devices
  • Pixel 3 / Pixel 3XL (The phone's screen will display the message: Charging slowly).
Notes:
  • Do not use Apple's 5V / 1A stock charger or a computer's USB port to power your wireless charger.
  • Place your phone on the center of the PowerWave Stand to ensure stable charging.
  • Cases made of metal and attachments such as magnets, cards, and grips will interfere with charging.
  • Quick Charge 2.0/3.0 wall adapter required for Fast Charge Mode.
Faster for Samsung
Optimized to match the charging requirements of the latest Samsung devices. A full charge takes 30 minutes less than other wireless chargers.

Universal Compatibility

Works with iPhone and other wirelessly charged devices.

Switch it Up

Place horizontally to enjoy videos while charging, or go vertical for video conferencing or to use facial recognition technology.

Through-Case Charging

PowerWave Stand supports charging through phone cases up to 5 mm thick. Please note that cases made of metal, and external attachments such as magnets, credit cards, grips, and stands will interfere with charging.