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+[ ] Goals
+ [ ] Demonstrate TDMA repeater
+ [ ] superior weak signal performance (-135dBm)
+ [ ] diversity to handle multipath
+ [ ] wideband audio
+ [ ] high bit rate data
+ [ ] low cost
+ [ ] Full SDR so we can define waveform
+ [ ] SSB up and down converters to allow full waveform control
+ [ ] no SoCs
+
+[ ] Doc
+ [ ] Block diagram
+ [ ] Uses cases in paragraph form
+ [ ] Gain, NF, IP3 budget spreadsheet
+ [ ] Power supply budget spreadsheet
+
+[ ] RF Specs
+ + these are targets, main goals are functional, leave
+ others to get sparkling RF performance
+ [ ] spurious tx emissions -45dBC @ 1W
+ [ ] IP3 10dBm
+ [ ] Blocking 95dB
+ [ ] System NF 2dB
+ [ ] ACS 50dB,
+ [ ] MDS (1200Hz) -135dBm,
+ [ ] Tx phase noise -124dBc/Hz ??
+
+[ ] Parts Selection
+ [ ] New audio amp chip
+ + bit better, higher power than LM386
+ [ ] should we add a LCD?
+ + how would this be used?
+ [ ] General purpose VHF transistors
+ [X] 1st mixer: ADE-1
+ [ ] RF switches
+ [ ] 1W PA transistor
+ [ ] LCD
+ [ ] encoder
+ [ ] first LO: Si5351
+ + also 2nd LO
+ [ ] optional Si570
+ + low phase noise soldered in option, provide footprint
+ + Si5351 still used as 2nd LO
+ [ ] how to select Si570?
+ + jumper 0hm resistor?
+
+[ ] Use Cases
+ [ ] VHF FM radio
+ [ ] Open Source VHF DV radio
+ [ ] Low MDS
+ [ ] TDMA Repeater
+ [ ] Setting frequencu and mode
+ + how to select frequency? What combinations of buttons
+ and encoder.
+ + do we need a full 0-9 keyboard?
+ + should we use a PC or remote device as primary input device
+ + does position of buttons/encoders/style of buttons make it easy
+ to use, e.g. set a frequency
+ [ ] Chnaging waveform
+
+[ ] Software Modules
+ [ ] VHF Modem
+ [ ] VHF protocol
+ [ ] TDMA framework around modem, burst modem
+ [ ] New Drivers
+ [ ] LCD
+ [ ] Encoder
+ [ ] Si570
+ [ ] Si5351
+ [ ] UI for setting a frequency
+ [ ] USB console
+
+[ ] Risks
+ + and experiments/tasks/prototypes to mitigate
+ [ ] DAC and ADC tied together
+ + demo tx/rx switching using this approach
+ [ ] Can we use ADE-1 bir-directional?
+ + what about diplexor?
+ [ ] Investigate use of other mixers
+ + but doesnt have to be perfect?
+ [ ] Celestra mixer
+ [ ] Glens
+ [ ] coupled res in shielded box or cots part?
+ [ ] how to swithc mixer/xtal filter
+ [ ] what else wcould er use instead of NE602?
+
+[ ] PCB layout
+ [ ] where do we put shilds
+ [ ] how to fabricate?