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 

The 5 Best Satellite Phones for backpacking of 2022 buyers guide

5 Best Satellite Phones for backpacking of 2022 (buyers guide)We’ll walk you through the perks and drawbacks of the best satellite phones for backpacking on the market so you can find the sat phone that will be ready when you need it the most. 
With the increasing coverage area of ​​satellite phones communicator providers, from Globalstar, Iridium, Inmarsat, Thuraya, it makes it easier for clients to have better communication in remote areas, such as mountains, hills, forests, oceans and areas that cannot be reached by cellular communications, common Wi-Fi networks, can currently be reached by telephone communications and satellite data, by interconnect Satellite Constellation with terrestrial Telecommunication. Now, Remote Industrial such Oil & Gas, Mining Company, Marine and Backpackers who have high mobility in Outdoor activity to the remote area, can stay connected and safe anywhere with the service from all Satellite Phones provider anywhere 

No Hidden Fees, No Roaming Charges


                             Buy Now $ 589.00


Specs


Network Coverage: Global with reduced coverage in the extreme North or South
Inmarsat's 5th generation of satellites provides network coverage wherever you go. 

With 13 geostationary satellites up in the air, each covers up to one-third of the Earth’s surface, and coverage extends from latitudes* of approximately -82° to 82°, letting you enjoy voice and data communications almost anywhere on Earth.

Constellation: 13 Geostationary satellites, Inmarsat owns and operates 13 satellites in geostationary orbit 35,786km (22,236 miles) above the Earth.

Sim Cards : BlueCosmo

Location Based Service : Yes

SOS Included : Yes

Durability : IP65 and IK04 resistant


Battery Life : 8 hrs talk time; 160 hrs standby

Weight : 318 g (11.2 oz)

Dimensions : 6.7 x 3 x 1.14"


Rating : 4.3/5


Pros : No Hidden Fees, No Roaming

Cons : Coverage extends from latitudes -82 to 82 degree of the globe

More Information Video of Inmarsat Isatphone 2.1






Specs

Network Coverage : Global, Pole to Pole

The Low-Earth Orbit Advantage

At only 476 miles (780 km) from the Earth, the proximity of 

Iridium’s LEO network means pole-to-pole coverage, a shorter 

transmission path, stronger signals, lower latency and shorter 

registration time than with GEO satellites.



Constellation : 66 Lower Earth Orbit Satellites

GPS enabled Location-based service : Yes, Online Tracking

SOS Included : Yes, Satellite Emergency Notification Device (SEND) Compliant SOS button design

Durability : Mil-STD 810F and Ingress Protection rating of IP65 , military Grade, Rugged

Battery Life : 4 hrs talk time; 30 hrs standby

Weight : 247 g (8.7 oz)

Dimensions : 5.5 x 2.4 x 1.06"

Another Features : Shock resistant, water jet resistant, dust proof.


Rating : 4.2/5

Pros : Wide Coverage from South Pole to North Pole

Cons : Talk time battery life 4 hrs

More information Video for Iridium Extreme




          Buy Now $ 197,99

Specs
Certified Refurbished Phone Satellite

Network Coverage : Using Low earth Orbit (LEO) Satellites

Globalstar Voice & Data Gen1 Products Home Zone Coverage Map
Constellation : 24 Leo Satellites interconnection with terrestrial telecommunication infrastructure 
Voice & Data : No Voice Delay, Data speed 9,6KBps uncompressed data, and 38.6 KBps compressed data (need 9600 hotspot, sold separately)
SOS : for U.S based phone number Direct Dialing 911 services
GPS : Yes

Battery Life : Talk time 3.75 hours ,and standby time 19 hours

Weight : 384 gr

Dimensions : 6.97" x 2.24" x 1.89" 

Rating : 4.1/5

Services :

Voice Mail

Call Forwarding

Short Message System (SMS)

Roaming & Long Distance

Display Position Location Information

Data Network Services :

By Connecting GSP-1600 to Globalstar 9600 (GDK-9600) customer can used their existing Wi-Fi enabled devices, such as smartphones, tablets, and laptops to send and receive emails.

Data speeds compressed up to 38.6 Kbps (uncompressed speed 9.6 Kbps)

Easily send and receive emails and post to social media from any WiFi enabled device

No Additional cost , by using existing Globalstar airtime plan minutes

WiFi range up to 30 ft

RF Power Output Phone GSP 1600 : +/- 26 dBm and +/- 29.5 dBm in using Car Kit.

Pros : The Cheapest Satellite Phone 

Cons : Need buy Globalstar 900 Hostspot for accessing WiFi

Here is Video Globalstar services included GSP 1600



Android OS Satellite & GSM Phone with Dual SIM



Specs

Network Coverage : Across Europe, Africa, Asia, Australia, and America with several roaming partners 
This map represents Thuraya expectations of Satellite Network Coverage, for further information please contact Thuraya Customer Care

This Map represents Thuraya expectations of GSM Coverage Roaming, for further information please contact Thuraya customer care.

Constellation : 5 Geostationary Satellite from Yahsat.
Since first Satellite in April 2011 Yahsat acquired Thuraya and joint ventures with  Hughes , and operate 5 Satellite and a reach spreading across more than 160 countries. 

You can look Elevation and Azimuth Yahsat Satellite based on your country by using the Look Angle Calculator from Yahsat. For example the elevation and azimuth Satellite Al Yah1 from Seoul, South Korea. You can entering in search box for another country.



GPS Enabled location-based service: Yes, GPS, BeiDou, Glonass systems for highest flexibility in all regions

Operating System : Android Nougat 7.1.2 

SOS Included : Yes, even phone in Switched Off Position, if you press SOS button and hold for 3 seconds , will start the handsets and triggers the SOS Call/SMS to pre programmed number.

Battery Life : Talk Time 10 hours, standby time 100 hours

Another Feature : Since the Thuraya X5 Touch phone used Google Android as platform, make user more free customize and personalize the phone to their needs (BYOA - Bring Your Own App). User can download from Google Play store from third party developer. Also Thuraya X5 Touch can easily integrates with wearables technology like Smartwatches,   health care wearable , etc.

Weight : 262 g

Dimensions : 145 X 78 X 24 mm

Pros : Coverage Satellite and GSM Phone, Android OS Nougat 7.1.2

5.2" Full HD Touchscreen made from Gorilla(TM) Glass from Corning.

Cons : Roaming Charges in USA and several countries

Rating : 4.8/5

More information Video Thuraya X5 Touch





Network Coverage : Orange Block Primary Coverage, Fringe Coverage Diagonal Lines Fringe Coverage, Customers will expected weak signal , Home Zone Green Border Home Zone Coverage, Customer in North America can freely roam without incurring additional airtime costs

Globalstar Coverage Map - Voice and Data Gen1
Constellation : 24 Low Earth Orbit (LEO) Satellite and traditional infrastructure on six continents serving for more than 120 countries

Battery Life : Talk time 4 hours, standby 36 hours

GPS enabled-location based service :  Yes

SOS Included : Yes ,by dial to GEOS for Satellite Emergency Notification Device (S.E.N.D), by dialing 1+ Area Code + Phone Number to International Emergency Response Coordination Center (IERCC), You can find more information on Geosresponse.com, GEOS have coordination with Search And Rescue Agencies around the Globe.

Weight : 1 pounds

Dimensions : 8 x 8 x 2 inches

Rating : 2/5

More Spec information you can find here

Pros : SOS signal send to S.A.R Agencies around the globe with coordination International Emergency Response Coordination (IERCC)

Cons : Roaming Airtime in Outside US

More information Video for Globalstar GSP-1700

Iridium Extremem 9575 Satellite Phone



  • Extreme Satellite Phone - The Smarter, Tougher Satellite Phone. Iridium Extreme® combines market-leading toughness with an unmatched feature set including location awareness and a fully integrated SOS button with emergency response service — all in one compact handset.
http://www.amazon.com/gp/product/B007I782J4/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B007I782J4&linkCode=as2&tag=1ststroller-20&linkId=5CP5RYPKDRUILEXX
http://www.amazon.com/gp/product/B007I782J4/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B007I782J4&linkCode=as2&tag=1ststroller-20&linkId=5CP5RYPKDRUILEXX

The Iridium Extreme is the toughest handset ever from the only company that offers real global, real mobile, real reliable communications. Engineered with more features and more accessories than any other satellite phone on the market,
 Iridium Extreme puts more innovative capability - and more ways to connect than ever before - into the hands of people everywhere. 

Standardized: A highly capable handset needs a highly capable network to empower it. Iridium Extreme is built with the same reliable voice and data capability that Iridium users have come to trust, and backed by the world's only satellite network that commands real global coverage, pole to pole. Optimized: From desert to mountain, jungle to tundra, Iridium Extreme puts more powerful capability into the hands of people, around the world. 

It has more features and accessories than any other satellite phone. It is the only one with real time tracking. And it can connect with Iridium AxcessPoint to create a Wi-Fi hotspot to keep in touch on your trusted devices - everywhere. Ruggedized: No other phone in the world has more guts or grit than Iridium Extreme. 

It is the first phone with military-grade 810F durability. It is dust proof, shock and jet-water resistant. From emergency crews and paramedics to military personnel and government operations, Iridium Extreme is built for the world's toughest, highest usage customers to make the connections that matter under the harshest conditions, anywhere on the planet.

Get Raspberi Pi 4 Tiny Single Board computer with highly efficient function



Raspberi Pi 4 , tiny computer with support 4K dual display monitor , choice of RAM from 1GB, 2GB, 4 GB, high speed Giga bit ethernet, with wireless networking and bluetooth support. 



Faster more Powerfull

Better Processor ,Faster data transfer speed,with fanless and low power supply for this tiny single board computer. Have 2 Port USB 2 ports and USB 3 ports, make transfer data ten times more faster. With application for robot brains, smart home hub, media centre, networked AI core, factory controller, and much more. Works compatible with old Raspberi model.

Amherst Researchers from University of Massachusetts , Tauhidur Rahman and Forsaid Al Hossain has invented a portable surveillance device powered by machine learning - called FluSense- using Raspberi Pi 4 , which can detect coughing and sneezing crowd size in real time, then analyze the data directly monitor flu-like illnesses and influenza trends.
The FluSense creators say the new edge-computing platform, envisioned for use in hospitals, healthcare waiting rooms and larger public spaces, may expand the arsenal of health surveillance tools used to forecast seasonal flu and other viral respiratory outbreaks, such as the COVID-19 pandemic or SARS.(umass.edu)

Spot X Satellite Messenger an important safety device for emergencies off grid


SpotX is Great Device for Camping, mount climber, hiking to your family and friends while you far from them. It sync with google map and your family and friends could know your position in the map , very save device and works very well in cold and rainy temperature, also there is features you can update to your social media twitter and facebook your realtime position and text message and email shows your exact GPS and altitude position. 
There is SOS button and if you press will exactly tell your family and friends exactly your  coordinate position. 
Spot X is great safety and emergencies device you can count in off grid area. 
71% Customers satisfied with SpotX , 29% giving 1-2 star on SpotX.
SpotX can exchange message and email from any virtual account anywhere in the world.
Can Sent SOS to 24/7 rescue center, can check tracking with certain interval time let your family and friends know you're ok and have interface with google maps.