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Updated Microphone Transceiver (markdown)

Brumi-2021 2024-02-04 14:58:18 +01:00
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Microphone-Transceiver.md

@ -175,7 +175,7 @@ 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.
* **TX-IQ-CAL:** TX I/Q channel phase calibration, range (+4º ...-4º). Specially usefull to optimize the SSB (USB-LSB) or DSB-SC , Suppressed carrier .
* **TX-IQ-CAL:** TX I/Q channel phase calibration, to adjust the imbalance IQ modulator phase error. The adjustment range is (+4º ...-4º). Specially usefull to optimize the SSB (USB-LSB) or DSB-SC , 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,