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| -rw-r--r-- | README.md | 73 |
1 files changed, 69 insertions, 4 deletions
@@ -8,8 +8,73 @@ combined with the [Anglian 3L transverter](http://www.g4ddk.com/Products.html). * Meant to be used with a microwave transverter * But also stand-alone 28MHz and 144MHz (The IF bands) * Using an ATMega controller - * Si5351 clock source + * Si5351 clock source (generates 3 clocks) * An LCD display -* Maybe - * Includes the Lars Widenius GPSDO originally published on [eevblog](https://www.eevblog.com/forum/projects/lars-diy-gpsdo-with-arduino-and-1ns-resolution-tic/?all) - * Offers a 10MHz output refclk for a transverter +* Discarded ideas + * Include a Lars Widenius GPSDO originally published on [eevblog](https://www.eevblog.com/forum/projects/lars-diy-gpsdo-with-arduino-and-1ns-resolution-tic/?all) + * Offer a 10MHz output refclk for a transverter + * Instead, have a 25MHz ref input, and use a LeoBodnar reference + +TODO before ordering the PCB +============================ + +* Switching + * Check switching with ATmega and validate resistors + +* Microphone input + * Verify microphone pinout for MH-42 + * Is audio level at SSM2167 output sufficient for the SA602A ? + +* Audio out + * Change RV303 footprint, as it needs to be on the front panel + +* CW + * Does the trick with the DC bias to leak the LO work ? + +* Consider reordering UI pins, if it simplifies routing + * Mockup location of potentiometers, encoder, display and buttons + * Check cabling + +* Si5153 + * Check desired frequencies can be achieved: + * LO1 = 28 - 4.9152 + VFO + * BFO = 4.91521 + * VHF-LO = 144 + 28 and 144 - 28 + +PCB Assembly Plan +================= + +1. DCDC converter for 8V and LDOs + * Check output voltages + * Check drop under load + +2. ATmega + * Programming + * Sidetone low-pass + * Probably need to do a UI proto already + +3. Si5153 + * Check I2C works + +4. 8V and 5V relay + +5. Baseband + 1. Crystal filter shape + 2. RX and TX filter shape + 3. Receive path: IF mixer, crystal filter relay, IF AGC, BFO mixer, AGC measure, AF amp, SPKR + * Verify LO levels into SA602A: at least 200mVpp + 4. Transmit path: Mic amp + +6. Anglian + 1. LO filter shape + 2. LO amp. Mixer needs +7dBm + 3. All passives + * Verify correct voltages for amplifiers + * Verify PIN currents (Between 20mA and 60mA, below 0.8V) + * Verify filter shapes + 4. IF amplifiers, both RX and TX + 5. VHF amplifiers + 6. VHF bandpass filter + 7. Mixer + +7. External switching relay |