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Updated Microphone Transceiver (markdown)

Brumi-2021 2024-02-04 10:20:57 +01:00
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Microphone-Transceiver.md

@ -84,6 +84,9 @@ From latest [Nightly Release - 2023-10-21] onwards it has been added a new check
![image](https://github.com/portapack-mayhem/mayhem-firmware/assets/86470699/d9f5fdc9-45fb-47d6-838a-b3789132dd0c)
Recently ,from nightly-tag-2024-02-04, after discussing about it , with a ham user discord colleague, we also added new GUI about IQ TX phase calibration adjustment . (It is in the bottom right part of the screen) : "TX-IQ-CAL"
![image](https://github.com/portapack-mayhem/mayhem-firmware/assets/86470699/f40c192b-ce66-478a-9769-1737c17eac2f)
* **F:** This field set the TX Frequency for the transmitter. Use encoder dial to adjust by Step value (uses a default step value, or step value saved in SETTINGS\tx_mic.ini file if "Load App Settings" is enabled). A long press of the Select button allows adjusting frequency digits individually.
@ -172,4 +175,12 @@ Once is marked , we have a common same frequency (F = F_TX) and therefore, to no
* **AMP:** RX LNA pre-amplifer 0=0dB or 1=14dB.
Note this application while performing a transmit function may well over deviate and generate unwanted harmonics.
* **TX-IQ-CAL:** TX I/Q channel phase calibration, range (+4º ...-4º). Specially usefull to optimize the SSB Suppressed carrier .
In Hackrf versions r1 to r8 , we are using max2837 , that has a calibration register settings of 5 bits , in Hackrf r9 , we are using max2839, that has 6 bits to cover the same range (+4º,..., -4º phase adj).
As example , see the attenuation of the residual SSB carrier effect, when adjusting that IQ Phase calibration value in an H1R1 with max2837,
![image](https://github.com/portapack-mayhem/mayhem-firmware/assets/86470699/ef8d4aba-9908-43a3-9177-c50c6c5ca155)
Note this Mic application while performing a transmit function may well over deviate and generate unwanted harmonics.