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June 06, 2020, 09:26:15 09:26


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 1 
 on: Today at 03:22:53 AM 
Started by PM3295 - Last post by PM3295
That was my thought as well, but I can't see how they got to 121 if -14 dBm gives about 93 dBuV. Unless they meant to print something like 92 dBuV and somehow an extra digit also slipped in the printing error. I don't think they would print 92.1 because the maximum output level is not that accurate requiring an extra digit of resolution.

 2 
 on: Yesterday at 09:22:43 PM 
Started by PM3295 - Last post by bigtoy
I wonder if the 121 dBuV number is a typo in the datasheet.

 3 
 on: Yesterday at 12:01:25 PM 
Started by Rego - Last post by cicos
Unlike you, I can't boast of my great knowledge.
My problem is that I started “cracking” more than 30 years ago and spent most of my time with MONS and GENS on the ZX Spectrum.
Later I “worked” in DOS programs with Turbo Debugger so I had a very hard time switching to Windows applications.
I spent a lot of time in Olly Debugger.
Of the "famous" programs for which I made the keygen was BOSH ESItronic until the appearance of version 2.0
I also wrote a calculator for the Blaupunkt car radio as well as for the Ford M series.
I also have programs that I have solved halfway (I can use them but with a slightly bigger problem)

  As for my cracking abilities, I can write:
"Too old to Crack, Too Young to Die!"

My biggest problem is my poor knowledge of English, so most of what I write is using Google Translator.

By the way, I also wanted to ask you for advice about a program.
In any case, thank you for taking the time to respond to my post.
BR

 4 
 on: Yesterday at 06:17:05 AM 
Started by Rego - Last post by Ahmad_k
Why do all good ideas end up inglorious? Sad
BR

So you are interrested ? Show me what you can do, what software did you crack ?

 5 
 on: June 04, 2020, 05:11:07 17:11 
Started by Rego - Last post by cicos
Why do all good ideas end up inglorious? Sad
BR

 6 
 on: June 03, 2020, 07:01:25 19:01 
Started by PM3295 - Last post by PM3295
As a follow-up, I made up a test board with an SMA connector directly connected to the output via a 10 nF coupling capacitor. I used the recommended 180 nH inductor to GND. I measured the output impedance at 100 MHz on my HP VNA, and it appears to be about 39 ohm in parallel with a small capacitance (18 pF), that varies with frequency. This is to be expected due to the internal varicap mentioned in the data sheet.

Next I took a CATV transistor (MPSH17) that is still readily available, and after more measurements came up with the amplifier circuit shown.
It provides between 18 and 20 dB gain, with the gain rising with frequency when tested between 88 -108 MHz. I tested with matching several other transistors (MPSH10/20, SH9018, 2N5179), but they all had lower power gain than the MPSH17.

So it appears that the chip's output impedance is supposed to be 50 ohms or near this figure. That makes the 121 dBuV entry even more puzzling.

 7 
 on: June 03, 2020, 05:59:43 17:59 
Started by coolguy - Last post by coolguy
Thank you for invitation. Registration is done.



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 8 
 on: June 03, 2020, 05:04:45 17:04 
Started by PM3295 - Last post by bigtoy
I disagree, if it can deliver 121 dBuV into a 50 Ohm antenna, it will deliver the same power into a 50 Ohm load if that load is suitable for the frequency.
50 Ohms is 50 Ohms

Perhaps I wasn't clear. Yes of course 50 ohms is 50 ohms - that's not the question. The question is: "when the datasheet says the QN8027 can output 121 dBuV, into what load impedance is it outputting into?" The datasheet doesn't say what the load impedance is, and my read on it is "definitely not 50 ohms". It looks to me like it's probably a far higher load impedance; my guess is in the hundreds of ohms.

 9 
 on: June 03, 2020, 04:38:20 16:38 
Started by coolguy - Last post by zuisti
This member is invited by me. Registration isn't completed yet.


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 10 
 on: June 03, 2020, 03:52:20 15:52 
Started by coolguy - Last post by coolguy
CountryIndia
NoteI am into Programming C,C++ and Visual Basic stuff and some Reverse Engineering for learning purposes. Have successfully created Embedded Projects including RTOS, Now interested in learning some Pixel Led programming on Nuvoton Microcontrollers, also want to Learn/Share my programming and electronics knowledge to this group. Will be honored being a part of this group with such creative people inside.

Thanks,
Waiting for fast invitation from someone !! 

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