IoT M2M blog

The home of free hints and tips about wireless IoT / M2M

Details out of the IoT M2M Cookbook

IoT M2M Cookbook – latest news

The latest version of the IoT M2M Cookbook made a big jump. I bought a GSM tester and made some measurement reports public.

Mesurement report with GSM tester

GSM burst

GSM burst

Such a GSM tester emulates a cellular based station. I explain in detail how to use the tester and which reports are essential in IoT M2M designs. On top I offer consultancy, local testing of your device together and sourceing an inexpensive used GSM tester.

 

Supply voltage drop during 2 Watt (33 dBm)

GSM module - voltage drop

GSM module – voltage drop

You can induce such voltage drops or overheat tests you with a GSM tester easily. Just to let you know that the power down resets are the frequently done developer mistake last 20 years. Without such a tester you have no chance to check this worst case conditions in your laboratory.

Antenna design mistakes

GSM PIFA antenna mistake

GSM PIFA antenna mistake

Several antenna design mistakes I explained in detail. Just read it, understand it and do not copy the mistakes to your design. Make it better, save money and be successful.
Examples:
I. The red arrow marked with shows the to short lenght of the ground plane
VI. The via whole is much to big and very close to the feeding point of the antenna

 

Free of charge software to match your antenna

Free software for antenna tuning

Free software for antenna tuning

With the book you will get a ready to copy GSM antenna shape. This antenna shape is explained very detailed. All common user mistakes are simulated as well. Nevertheless the Touchstone file out of the simulation you can load to the free of charge matching software. You can research yourself what will happen by changing the value of the capacitors or inductors. You also have the freedom to run the automatic mode and generate a matching circuit based on the uploaded Touchstone file within seconds. Touchstone is also the format that you will get out of a network analyser by measuring your embedded antenna on your PCB.
Description of Touchstone files at Wikipedia

Radio approvels and tests

FCC, R&TTE, PTCRB and more

FCC, R&TTE, PTCRB and more

How to test an IoT M2M device and how to pass the approvels in foreign countries got an update. I tell about my concern about LTE with its bands from 700 MHz up to 3500 MHz. I mentioned problems in your design that you have to consider. Cheap equipment to test your GPS module in laboratory and in mass prodution is listed too.

Nevertheless I will follow wishes for further content until end of this year. I will allow the sponsering of the book until end of the year as well. Any sponsor can ask for a listing in the book.

The whole table of content of the IoT M2M Cookbook here.

IoT M2M Cookbook readers feedback

From Ireland:
Harald,
I wanted to send you a short note to thank you for the cookbook. I am enjoying it a lot, and it is helping me address some issues in my designs! I wish you had sent it to me last year!!
On a separate note, I would like to engage you for maybe two days of consultancy to review some of my designs and to assist me with some testing. I am based in Dublin, Ireland and I could either come to you in Germany, or maybe you would like to come to Dublin. Please can you let me know if this is possible, and of course what rates that you would charge. Many thanks for your help.
From US:
Thanks. Just wondering if you are available for some consulting-type engagement if the need arises in the future?
From US:
Yes…we should discuss contracting. How much is your hourly rate?
From Israel:
Not expecting you to work for free We can do it several ways.

If you also have interest in a copy of the IoT M2M Cookbook or consultancy, then do not hesitate to drop an email to harald.naumann (at) gsm-modem.de

 

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