# Open re-implementation of the Quansheng UV-K5 v2.1.27 firmware
This repository is a merge of [OneOfEleven custom firmware](https://github.com/OneOfEleven/uv-k5-firmware-custom) with [fagci spectrum analizer](https://github.com/fagci/uv-k5-firmware-fagci-mod/tree/refactor) plus my few changes.
All is a cloned and customized version of DualTachyon's open firmware found here ..
https://github.com/DualTachyon/uv-k5-firmware .. a cool achievement !
> [!WARNING]
> Use this firmware at your own risk (entirely). There is absolutely no guarantee that it will work in any way shape or form on your radio(s), it may even brick your radio(s), in which case, you'd need to buy another radio.
*`RxOff` menu setting offsets the receive frequency by any specified amount in the range of `0-150Mhz` for use with upconverters. Allows to fine tune frequency (in `1kHz` steps) as opposed to other implementations that use hardcoded offsets. (**IMPORTANT: Make sure you set this value to 0 if not using an upconverter, when used for the first time. Otherwise it might load some random offset from EEPROM.**)
*`ENABLE_SPECTRUM_COPY_VFO` allowing to exit the spectrum and fine tuning screen with PTT button and copy current peak frequency, modulation, step, bandwidth to VFO. Also entering spectrum will carry these settings from VFO (full integration). Now to enter fine tuning screen in spectrum press MENU button. This allows you to save and respond to the frequencies found much faster.
*`ENABLE_ADJUSTABLE_RX_GAIN_SETTINGS` keeps the rx gain settings set in spectrum mode after exit (otherwise these are always overwritten to default value), this makes much more sense considering that we have a radio with user adjustable gain so why not use it to adjust to current radio conditions, maximum gain allows to greatly increase reception in scan memory channels mode (in this configuration default gain settings are only set at boot and when exiting AM modulation mode to set it to sane value after am fix)
*`ENABLE_SPECTRUM_CHANNEL_SCAN` this enables spectrum channel scan mode (enter by going into memory mode and press F+5, this allows SUPER fast channel scanning (4.5x faster than regular scanning), regular scan of 200 memory channels takes roughly 18 seconds, spectrum memory scan takes roughly 4 seconds, if you have less channels stored i.e 50 - the spectrum memory scan will take only **1 second**
*`VOXSen` fixed and improved VOX sensitivity setting from menu. Added `VoxDel` - VOX delay setting allowing to set value to `0` for no VOX delay which might be useful for packet radio enthusiasts (APRS etc.).
ENABLE_SQUELCH_MORE_SENSITIVE := 0 make squelch levels a little bit more sensitive - this has been reported to cause radio freeze in presence of strong signals
ENABLE_BYP_RAW_DEMODULATORS := 0 additional BYP (bypass?) and RAW demodulation options, proved not to be very useful, but it is there if you want to experiment
ENABLE_BLMIN_TMP_OFF := 0 additional function for configurable buttons that toggles `BLMin` on and off wihout saving it to the EEPROM
ENABLE_SCAN_RANGES := 1 scan range mode for frequency scanning, see wiki for instructions (radio operation -> frequency scanning)
ENABLE_SPECTRUM_COPY_VFO := 1 pressing MENU in spectrum mode will exit and copy current peak frequency, bw, step, modulation to current VFO, also entering spectrum will carry these settings from VFO (full integration)
ENABLE_SPECTRUM_SHOW_CHANNEL_NAME := 1 shows channel number and channel name of the peak frequency in spectrum
ENABLE_ULTRA_LOW_POWER_TX := 0 transmits with ultra low power. useful for dev/testing
ENABLE_ADJUSTABLE_RX_GAIN_SETTINGS := 1 keeps the rx gain settings set in spectrum mode after exit (otherwise these are always overwritten to default value), this makes much more sense considering that we have a radio with user adjustable gain so why not use it to adjust to current radio conditions, maximum gain allows to greatly increase reception in scan memory channels mode (in this configuration default gain settings are only set at boot and when exiting AM modulation mode to set it to sane value after am fix)
ENABLE_SPECTRUM_CHANNEL_SCAN := 1 this enables spectrum channel scan mode (enter by going into memory mode and press F+5, this allows SUPER fast channel scanning (4.5x faster than regular scanning), regular scan of 200 memory channels takes roughly 18 seconds, spectrum memory scan takes roughly 4 seconds, if you have less channels stored i.e 50 - the spectrum memory scan will take only **1 second**
If you have docker installed you can use [compile-with-docker.bat](./compile-with-docker.bat) (Windows) or [compile-with-docker.sh](./compile-with-docker.sh) (Linux/Mac), the output files are created in `compiled-firmware` folder. This method gives significantly smaller binaries, I've seen differences up to 1kb, so it can fit more functionalities this way. The challenge can be (or not) installing docker itself.
