The mcHF HF SDR Transceiver - 4

As I am still waiting for the MOSFETs to arrive, thought of sharing some technical details on the mcHF.

Features:
  - A standalone[PC not required] compact embedded HF transceiver
  - 2 MHz to 30 MHz Continuous frequency coverage
  - Operates on USB, LSB, AM and CW
  - 2.8 inch color TFT LCD
  - Four rotary encoders and 17 buttons for easier operation
  - Fast and fully electronic RX/TX switching
  - Two USB ports – for PC control and external keyboard
  - Two temperature compensated oscillators/clocks
  - Four digital filters – 1.8kHz, 2.6kHz, 3.6kHz and 10kHz
  - Built in Iambic Keyer that supports Mode A and Mode B
  - Large 48 kHz spectrum display
  - Variable tuning steps

Hardware Specification:
1. Processor - STM32F407 from ST Microelectronics.

     - Core: ARM® 32-bit Cortex®-M4 CPU with FPU

     - 168 MHz, 32 bit
     - 100 Pin package

     - 3.3 V operation

     - 1 Mb flash memory

     - 3x12 bit A/D converters

     - 2x12 bit D/A converters

2. Codec - WM8731 from Wolfson

     - 28 Pin package
     - 3.3 V operation
     - ADC, DAC sampling frequency - 8 kHz to 96 kHz
     - ADC SNR 90 dB
     - DAC SNR 100 dB

3. RF Power Mosfet
     - 2x RD16HHF1 RF MOSFET from Mitsubishi

4. Local Oscillator
     - Si570 from Silicon Labs
     - 10 MHZ TO 1.4 GHZ I2C PROGRAMMABLE XO/VCXO
     - 8 Pin SMT
     - 3.3 V operation

5. SN74CBT3253C Tayloe detector as a direct conversion mixer