In an earlier test of the AIS NB-IoT Arduino shield, I touched on the fact that the AIS 923MHz NB-IoT network tested illustrated "not the best reliability" due to spotty 923MHz cell tower penetration / coverage.
However, on the ocean side of my condo, I have improved this reliability issue a few DB (my RF power meter is not very accurate, sorry) with this antenna:
More importantly than potential antenna gain, the 923MHz NB-IoT signal is considerably more reliable after placing the antenna at the window and off my desktop (which is about 3 to 4 meters away from the window).
In addition, I have the Arduino sketch sending the message to a remote Linux server via BLE and the NB-IoT network and will post the code / sketch after I add a mini-app to get some server stats like the server load averages back to the iPhone. Just need to add a few lines of code to my test Python UDP server code and change the sketch to receive the result and display it on the iPhone.
So far, it's pretty simple (after working out the conflict between serial comm pins last yesterday).
I just moved away from a T3 line back to a dial up I just wanted to know would a P200 with 64meg and a 4 gig hard drive be ok for a linux server for an additional 3 pcs all running win98. I will be dialing into an isp using a 56k v90 modem.
Any support or help will be great. (3 Replies)
Hello all
this is general question , if i have web server installed in my local pc and i have client that connecting to that web server
can i force it always to go via the internet network ?
the reason im asking is .. that im noticed when i close my internet connection i still can connect to my... (2 Replies)
hi i have linux server connected to internet through a switch/router. i have opened a port on the router and i am able to connect to the server if iptables is off. but when it is on i cant.
i want to create a rule in iptables so that it accepts packets coming from a particular datacard. it... (7 Replies)
In my further exploration of Arduino, today I decided to install the arduino-cli on my mac today.
https://github.com/arduino/arduino-cli
I followed the instructions for macOS but when I got to this part:
arduino-cli board list
I got the dreaded "Unknown" Fully Qualified Board Name... (1 Reply)
My favorite projects are always related to the "latest" tech in command and control, networking and network communications. This Elecrow GSM/GPRS/EDGE SIM5360E 3G Shield seems to be the "latest and the greatest" as far as 3G and GPS, as far as I can see so far, but I has it drawbacks for sure.... (6 Replies)
Today I received my NB-IoT Arduino Shield for AIS (Thailand). Here is a "pinout" photo of the shield.
My shield looks just like the one above, for the most part. I'll post another photo of the actual device later.
When I received the shield in the mail, I went immediately to a local... (8 Replies)
Normally I have very good experiences buying from AliExpress, but in this case with Elecrow, I'm disappointed.
After confirming with Elecrow on AliExpress that their Elecrow GSM/GPRS/EDGE SIM5360E 3G Shield for Arduino would work with 3G SIM cards in Thailand, I purchased one. My plan was to... (1 Reply)
Here is a sketch to do basic testing for the Arduino UNO and the MLT-BT04.
This BLE module works with IOS (iPhone) and I'll add some details on my IOS testing with an iPhone in a follow-up post.
For now, here is the basic BLE (HM-10) sketch for the Arduino UNO:
/*
Arduino test-code... (7 Replies)
With a little bit of work, was able to build a nice "Wuhan Coronavirus Status" app using MQTT and the IoT-OnOff app. More on this technique here:
ESP32 (ESP-WROOM-32) as an MQTT Client Subscribed to Linux Server Load Average Messages
The result turned out nice, I think. I like the look and... (10 Replies)
Normally I'm not into kits, but I thought my wife would enjoy this one since she is a big fan of robots and droids on StarWars!
We are done with the basic mechanical assembly and starting on the electronics assembly today.
The robot's "brain" consists of three levels. The Arduino board, on... (5 Replies)
Discussion started by: Neo
5 Replies
LEARN ABOUT OSX
first
FIRST(1) General Commands Manual FIRST(1)NAME
first - Yagi-Uda project quick antenna builder
SYNOPSIS
first filename elements f_min f_design f_max f_step diameter
DESCRIPTION
The program first is one of a number of executable programs that forms part of a set of programs, collectively known as the Yagi-Uda
project , which were designed for analysis and optimisation of Yagi-Uda antennas. first is used to define an antenna quickly, if you are
not interested in analysing a specific design (in which case use input ) but need to get a design that is half-way reasonable so that it
may be optimised. It is much faster in use (since its not interactive) than input The design methodology that first is the DL6WU antenna
designs, which are valid for 10 or more elements, although first will calculate for any number of elements. DL6WU reccomends a folded
dipole, but the designs here are for a simple dipole, since I don't yet know how to calculate the self and mutual impedances of folded
dipoles.
LIMITATIONS
Filenames, including full path, can't exceed 90 characters.
Does not take into account the variation of impedance of a dipole with change in wavelength/diameter of elements.
FILES
filename Yagi description, created by first.
filename.out Binary data file, created by yagi.
filename.dat Performance of antenna, created by output.
filename.gai Gain of antenna, created by output.
The DOS .EXE files as distributed require a 387 maths coprocessor to be present and will not run without it. A 486, Pentium, and I assume
later processors of this series will run it without any extra hardware.
PLATFORMS
Both DOS and and Unix versions have been built. The DOS version as distributed requires a 386 PC with a 387 maths coprocessor. The DOS ver-
sion is no longer being developed, so the DOS executables included with the distribution are not upto date with the current source code.
AUTHORS
Dr. David Kirkby G8WRB (david.kirkby@onetel.net). with help with the conversion to the DOS/PC enviroment from Dr. Joe Mack NA3T
(mack@fcrfv2.ncifcrf.gov)
SEE ALSO input(1), output(1), yagi(1), optimise(1).
BUGS
Bugs should be reported to: David Kirkby G8WRB (david.kirkby@onetel.net). Bugs tend actually to be fixed if they can be isolated, so it is
in your interest to report them in such a way that they can be easily reproduced.
If the input file is edited manually and done incorrectly, there can be unpredictable results.
Options are not checked for sensible numbers. A negative length can be entered!
Version 1.10 Fri Dec 2 1994 FIRST(1)