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-Picardy 2020
-============
+Picardy 2020 and DART-70
+========================
 
-A reinterpretation of the [Picardy 2m SSB transceiver](http://f6feo.homebuilder.free.fr/transceiver_PICARDY.html) by F6FEO
-combined with the [Anglian 3L transverter](http://www.g4ddk.com/Products.html).
-Additional inspirations: uBitx, the KN-Q7, LimeRFE and EI9GQ's "Building a Transceiver" book. Many thanks to all the
-designers behind these projects.
-
-The hardware design is licenced under the "CERN Open Hardware Licence Version 2 - Permissive", see *cern_ohl_p_v2.txt*.
-The firmware is MIT-licenced.
-
-* Designed in KiCad
-* Meant to be used with a microwave transverter and stand-alone 144MHz
-  * For transverter usage, no PA reduces current consumption.
-  * For stand-alone, see MMRF1021 amplifier below.
-* Using a STM32F103C8T6 controller
-  * Programmed in [Rust](https://rust-lang.org/)
-  * Si5351 clock source (generates HF clocks)
-  * An LCD display
-* 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 an external reference
-  * Use the Si5351 to generate the VHF LO at 116 MHz
-    * It wasn't clean enough, so a separate [XTAL LO board](./lo_board/) was designed
-    * With a 114.286 MHz crystal, we get a first IF of 29714 kHz
-
-*First QSO done with this transceiver and MMRF1021 amplifier on 2020-12-07*
-
-On RX, an [LNA4ALL](http://lna4all.blogspot.com/) LNA was used. On TX, 2x SPF5189Z, a bandpass filter to remove the LO,
-and the [MMRF1021](http://git.mpb.li/git/mmrf1021-pa/about/) amplifier were used, giving about 200mW output power on the
-very first trial.
-
-Later, the external bandpass and 2x SPF5189Z were replaced by an internal bandpass with less insertion loss and a single
-SPF5189Z.
-
-
-*First 3cm QSO done with Picardy 2020 as IF transceiver on 2020-02-21*
-
-Using a Downeast Microwave 10368CK transverter.
-
-
-TODO
-====
-
-* Where does the 1.6kHz offset come from?
-
-Open questions
-==============
-
-* CW
-  * Does the trick with the DC bias to leak the LO work ?
-    * Not tested, but plan B done (J306)
-    * Use an additional PWM output for plan B?
-  * Put sidetone volume setting before RV303?
-    * Hook up to LM386 BYPASS?
-
-Issues
-======
-
-* Coupling between VHF filter coils was way too large
-  * Fixed, replacement of coupling caps.
-* SEQ0 is used in inverted-logic in baseband, and noninverted for power relay
-  * Due to inconsistent naming
-  * Ugly fix on K603 side, use SEQ0n, SEQ1, SEQ2
-* G6K-2F-RF all have the Y footprint, not the equidistant one.
-  * And they have additional GND flaps too, which are not in the Kicad footprint library
-  * Can be kludged-in
-* 5V jumper is less useful as hoped
-  * Intention: disable VHF stuff
-  * Unintended effect: removes LCD backlight
-* C319 and C326 are redundant
-* BC856W wrong footprint
-* R327 upsets DC offset of audio amp, added 2.2uF capacitive decoupling in series with 1k
-  * PTT makes loud click, assemble with 100nF only, still loud
-  * Connected LM386 back to 8V, through 0 Ohm instead of 10 Ohm (was on 12V through 10 Ohm because DCDC noise). Still
-    loud.
-  * Investigate other muting schemes.
-    * Connecting BYPASS to GND generates click
-    * 2N3819 based muting according to G3YCC works better.
-  * Assemble 1k + 100nF for coupling, revert to 12k for R329, use 20k for R326 to slow down the transition a bit
-* 2m LPF from LimeRFE use values I don't stash
-  * 20pF done with 2x 10pF
-* SW: ADC input for buttons looks messed up...
-  * Four buttons instead of 7 are enough anyway
-* Connect 3V3 LDO to 12V directly
-* Also, replace DCDC by L7808 to improve spectral purity
-  * Actually there would be more to be gained with a DCDC on 5V or 3V3!
-* Added a LM360T LDO for the MMRF1021 so that it can be powered from 3S LiPo (11.1V) and Pb (13.8V) batteries
-* Add 2.2uF caps near consumers
-  * Replace C535, C536
-  * Replace C343, C315
-  * Next to R508
-  * Next to R305
-  * Parallel to C331
-  * Parallel to C607
-  * Next to R306
-  * Next to R504
-  * Next to R328
-  * Next to R515
-* Reduce RF coupling
-  * Added 100pF caps on microphone connector and CW input
-  * Added 22pF on DC jack, DIN
-
-PCB Assembly Plan
-=================
-
-1. DCDC converter for 8V and LDOs
-   * Check output voltages
-   * Check drop under load
-
-2. STM32F103C8T6
-   * Programming
-   * Sidetone low-pass
-   * Probably need to do a UI proto already
-
-3. Si5153
-   * Check I2C works
-
-4. 8V and 5V relay
-   * Check switching with microcontroller and validate resistors
-
-5. Baseband
-   * Crystal filter shape
-   * RX and TX filter shape
-   * Receive path: IF mixer, crystal filter relay, IF AGC, BFO mixer, AGC measure, AF amp, SPKR
-      * Verify LO levels into SA602A: at least 200mVpp
-   * Transmit path: Mic amp
-
-6. Anglian
-   *  LO filter shape
-   *  LO amp. Mixer needs +7dBm
-   *  All passives
-      * Verify correct voltages for amplifiers
-      * Verify PIN currents (Between 20mA and 60mA, below 0.8V)
-      * Verify filter shapes
-   *  IF amplifiers, both RX and TX
-   *  VHF amplifiers
-   *  VHF bandpass filter
-   *  Mixer
-
-7. External switching relay
-
-
-Tuning
-======
-
-IF gain (R307)
-
-Define if we need C361, C360
-
-Ensure LO1 and BFO voltage level at TP301 TP302
-
-
-
-Additional remarks
-==================
-
-Very good [explanations](https://groups.io/g/BITX20/topic/si5351a_facts_and_myths/5430607) about DDS vs DPLL from Hans Summers
-
-Si5153 test before PCB fab:
-
-* It seems the desired frequency plan can be achieved:
-  * clk0: LO1 = 28 - 4.9152 + VFO, i.e. from 23 to 25
-  * clk1: VHF-LO = 144 + 28 and 144 - 28, i.e. 116 MHz
-  * clk2: BFO = 4.91521
-  * See `freqplan.py`
-* This ended up being too noisy and was replaced by an external VHF LO, with LO1 and BFO generated with Si5153
-  * No 116MHz crystals on mouser, but 114.285MHz are available, HF bandpass filters recalculated.
+This repository contains design files and firmware for both the Picardy 2020 2m SSB/CW transceiver
+and the DART-70 4m SSB/CW transceiver designed in 2023.
 
+Please see [README-4m](README-4m.md) or [README-Picardy2020](README-Picardy2020.md) for more details.