The WORKBENCH part 1

End Devices (Nodes) Hardware
389

dBm is a log ratio of signal gain or loss.
See for a longer explanation

I know what dBm is used for, but my statement was correct, to quote Wikipedia;

"dBm (sometimes dBmW or decibel-milliwatts) is an abbreviation for the power ratio in decibels (dB) of the measured power referenced to one milliwatt (mW). It is used in radio, microwave and fiber-optical communication networks as a convenient measure of absolute power because of its capability to express both very large and very small values in a short form.

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390

Not entirely. It also simplifies power calculations.

391

Maybe RAK’s ‘magic’ stands for:
‘how are you going to mount this thing without mounting materials?, it must be magic’. :roll_eyes::wink:

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392

tnx for the info

So (without ‘real’ measurements yet) my observation that the RAK antenna performs equal or a bit less then 3 dBI I have could be right ? :roll_eyes:

393

Well even if the 8dBM was meant to be 8dBi, you might expect such an antenna to be bigger (longer) than one that is 3dBi. I am very sceptical as to the claims made by some who sell antennas.

Its actually not that difficult to measure the real world relative gain just use a 1/4 wave vertical with radials as a reference.

395

yes I am :sunglasses:

https://www.thethingsnetwork.org/forum/t/the-library-basement-part-4/11489/235

396

Nice. Looks interesting. I hope everything will fit, because it has different measures.
(Wouldn’t it be easier to use his custom made PCB?)

397

x682

lots of 'old ESP12’s in stock … plenty of space :sunglasses:

398

No… ‘The’ days started half a decade before Commodore:
I still have a TRS-80 somewhere in the basement
(and a VIC-20)

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399

my most funny one is called ‘banana’ … a chinese apple 2 clone , still have it somewhere

cbm3032
this was my first ‘real’ computer (I was 15/16 y/o) - a commodore CBM 3032
had to work really hard before I could buy it
sold it just a few years ago in working condition to a collector

400

Do you have one of these;

Its in my attic somewhere.

Plus an Apple II, UK101, Tangerine Microtan 65, BBC Micro (used to make them) and an assortment of IBM AT and XT motherboards (used to fix them).

I recall that the Apple II cost me circa £1299 with disc drive in 1979, the equivalent of £7000ish in todays money.

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401

The NSc SCaMP wow I forgot that one! I designed and built my own computer based around that and set on Veroboard entered it for the Young Engineer for Britain comp (yes I was young once :wink: ) whilst an undergraduate apprentice for a Mil Aero player. Even fabricated my own case for it - approx 4u high - using apprentice training school facilities - in military green power coated aluminum. Could programme in Hex Assembly using 2 x hex key pads (Add & Data) and associated dual (quad?) 7 segment led displays and some switches controlling load/run etc on front panel…or could take the ‘easy’ route using an in built version of TinyBASIC (2kB?) that was accessed over serial port connected to a current loop driving a telex type TTY keyboard/printer as user interface…simple hello world type progs worked well but never quite got a moon lander game to run quite right (just added more craters most runs! Teh Heh). It was quite a hack. I think it was around then I decided I wasn’t a ‘Softie’ and should stick to hw & semi’s…now here I am worry about how to programme and load LoRa nodes…ah well what goes around comes around…:grin:

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402

x685

:rofl:

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403

Rick Astley, get out that device

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404

did you get it to work ? lmic / spi ?

405

And

I noted it at The TTN Conference as well, many ‘oldies’ in this IoT business
a contrast with the regular Amsterdam Meetup scene

406

Indeed … no age discrimination at The Things Network ! :metal:

407

God, you guys are making me feel old. Nascom 2, 1981. 300 baud ex-British Telecom modem… Those were the days…

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408

ahh… 1981 … My first IoT project
I hooked up my lights and radio to the VIC20, and ditched my alarm clock :slight_smile:
(truth to be said; I did not built the Hardware for it; I was Software, I am Software)

409

1981… we started our first company :sunglasses:

KCS-products small8

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