PR to increase the BW Options in the Capture App , beyond the current max, 500khz. (from 600Khz till 2,75Mhz) all of them work well into the screen, but only <= 600Khz BW are correctly saved into SD Card with full captured data. (Onwards, >600Khz optiions, at the moment , the created SD card file has decimated data, due - to SD Card writting speed limitations),- but I feel still quite interesting feature to keep them.
Current Replay App , shows in the user menu a UI to select two kind of controls for the RF output level :
1-) LNA GAIN (0..40 ) dB => but it has no TX effect because it is the RX-LNA . GAIN
2-) RF AMP (0 / +14dBm , (that was correct , we have two IC's , RX / TX ) (sw is controlling weill .
Note, although SW Version 1.40 do not leave to control drictly the GAIN TX
, that Replay App , in fact, it was using the inheritated selected GAIN TX from any previous usage of MIC App.
That Pull request alllows now to have the following controls
1-) GAIN TX (0..47 ) dB (now it is OK
2-) RF AMP (0 / +14dBm , (that was correct , we have two IC's , RX / TX ) (sw is controlling weill .
Remakrs : After the change , now we can control the GAIN TX , but not "in the fly" . When we are in the Replay loop , any change of the FREQUENCY or GAIN TX will be ignored , till we play STOP / START the loop again. (but the AMP RF (0 /+14 dBs) it works in the loop withouth any problems (same as before ) .
checking if the ICAO address of the frame and the current item
in the details view match. Slight refactor by placing the decimal
to string conversion function into the string_format module.
Added fix in the scope of issue #365
FrequencyStepView field in TransmitterView class
FrequencyStepView field in TransmitterView class
Update ui_transmitter.hpp
Update credits
Fixed left padding of the decimal part of the numbers.
features a square wave mode.
Added proportional beep duration based on the RSSI as well.
Now reading the current radiosonde frequency from the
battery backed RAM instead starting with the same frequency
all the time.
I think the Jammer deserves a green icon, since it actually does it job pretty well.
Then there is a Jitter parameter. It allows to introduce a jitter from 1/60th of a second up to 60/60th of a second (a full one). It will delay / move forward either the TX or the cooldown period for a maximum of a half of the time you choose as jitter.
Meaning: If I choose 60/60th, a full second of jitter, it will produce a random number from 1 to 60.
Then it will calculate jitter = 30 - randomnumber
THen it will "add" that (positive or negative) time to the time counter for the next jitter change of state.
Discord User jteich did some investigation (Thanks!) and helped me understanding this rather obscure parameter:
Internally, is called "TRIGGER", and is passed into the baseband when configuring the desired spectrum sample rate.
Please forgive me in advance if this explanation is not 100% correct. It's only my interpretation, based on my own observation and jteich's comments over Discord chat.
This trigger parameter apparently determines the amount of data over time used for calculating the signal's power inside each specttrum's bin, before considering it "done".
In short, if you lower this resolution value then the cascade will tend to be rendered a bit faster, while kind of blind to tiny signals.
On the other hand, a bigger value will help rendering and distinguishing different signals on the cascade.
Too big a value can easily clutter up the cascade. But then it may be a "blessing" when inspecting higher freuqencies -where hackrf is more deaf"
The default value of 32 is quite decent. But then, now you can experiment with it. Cheers
Added a PRESETS.TXT file (inside /LOOKINGGLASS folder).
Also optimized the way the spectrum signal is integrated into the cascade.
Added provision for ranges lower than 240MHz but I am afraid that at this time it will not be advisable to lower ranges any more than 240MHz, since some artifacts and frequency running - moving out of place- occurs.
I can only hope that someone with a better understanding of hackrf's inner code can fix this issue and perhaps enhance the scanning speed.
I found some "original commenting" inside the code:
// TODO: Move more low-level radio control stuff to M4. It'll enable tighter
// synchronization for things like wideband (sweeping) spectrum analysis, and
// protocols that need quick RX/TX turn-around.
Which makes me think that there are things "missing" from the portapack side of the code, for allowing serious speed sweeping. So I am concluding that with current "portapack framework" this might be "the best possible thing".
It is to be noted that the "new" internal sweep mode code is signed by:
* Copyright 2016 Mike Walters, Dominic Spill
*
* This file is part of HackRF.
Maybe Mike or Dominic can be contacted and hopefully lend a hand on enhancing this code.
