Release EU1KY AA Firmware CEC Version 0.71 ( V1.0 Candidate)

This version is a development version and may be unstable, and some of the features included in this version may be removed from V1.0, Stabilized version V0.53 has been released, and stabilized version is posted separately.






 If this version is confirmed to be stabilized by testers, it will be changed to Version 1.0.
The firmware that was created by EU1KY and improved by DH1AKF was already great.
I just added a little extra to the already great firmware.

Some of the features I had planned are not yet implemented. To implement these functions, we must remove the existing functionality because of STM32F746's small memory.

1.2 About New project - HamToolKit Based STM32F746G-Disco
So I decided to convert Version 0.7 to Version 1.0 and create a separate Ham Tool Kit based STM32F746G-Disco. It's probably a Swiss Army knife for Ham. Since the antenna analyzer function is not included, Audio In can be used, so various functions can be implemented and the price will be lower.


STM32F746G-Disco : $56.25 / Ships free
SI5351 Board         : $  3.5  / Ships free
RTC DS1307          : $  0.5  / Ships free

You will not need to solder the parts directly because only use bought modules.

I will not be able to predict when this project will start because I will be conducting experiments with the FT8 and FT4 protocols for the time being.

How to use Voice Keyer in EU1KY with CEC Firmware V0.7

Version 0.7 is being prepared for deployment.
Voice Keyer (or Voice Recorder) function was added in Version 0.7.

If you only want to use it as a voice recorder, you do not need any modifications, Just need update the firmware.

If you want to use it as a Voice Keyer, you need a very simple modification.


1.Modifications for use as a voice keyer
1.1 PTT Control

Below is just one example.
Only the part with PC817 is shown below.




1.2 MIC Input
It uses a push switch to switch between microphone and AA.
It is recommended to pass a small transformer between the transceiver and the AA.


 Please use only one (Left or Right) because the speaker jack of AA is stereo.
Recording and playback will operate in stereo. You can use either the left or the right one for you.


2.How to use Voice Keyer

2.1 Use Voice recorder
Touch the 'Voice Keyer'
The 'USB Host' menu has been moved to the Configuration section.


The screen below is the Voice Keyer screen.


A: Display Window
B: Slot buttons
C: Volume adjust
D: Repeat enable and Repeat (rx time) adjust
E: Menu buttons


Select one of the Slot buttons on the right to select the Slot you will use.
Up to 14 slots can be used.

Touch the 'Record' button on the bottom right to record to the selected Slot.



When recording is completed, touch 'Stop' button.
The number of text in the Slot button changes as shown below. this is Play Time of the recorded file.
The display window shows the play time of the selected Slot.


To record to slot2, select the Slot2 button and touch the Record button. When recording is completed, touch 'Stop' button.



To play the recorded file, touch the 'Play' button.


To play the recorded file of another Slot, select Slot and press 'Play' button.




2.1 Use Voice Keyer
If you have recorded a 'CQ' Message, you can transfer it to your transceiver.
At this time, it must be modified for PTT control.

Select the Slot where your 'CQ' message is recorded.
Touch the 'PTT control' button to activate the 'PTT' function.

Touch the "Play" button. The 'CQ' message you recorded will be sent over the transceiver.



If you want to continue sending 'CQ' until the other station answers, touch the 'Repeat' button to activate the 'Repeat' function.



After 'Play', wait for 'Repeat Delay' time and resend.
The progress bar will move in gray color.



You can set the Repeat Delay Time (RX Time) to check the response of the other station.





Thanks for reading.

Ian KD8CEC

Release EU1KY AA Firmware CEC Version 0.53 

How to use Audio DSP on Antenna Analyzer (Features included after CEC V0.5)

Audio DSP is a function that filters the sound coming from the transceiver into a desired range.

You do not need any hardware changes to use this feature. Just prepare your headphones. If you want to make a little bit better, you can add a very small $ 1 speaker to your board.

I am preparing to distribute the test firmware (V0.52). Please wait 1 ~ 2 days.

1.Required Hardware
EU1KY AA and Headphone.



The STM32F746 board has two sound inputs. However, Mic Jack is already using the EU1KY RF board.


Another sound input method of the STM32F746 is two microphones mounted on the board.

I use only one of the two microphones. (Right)
Put AA near the transceiver speaker and plug your headphone into the phone jack and you're all set.



Or you can install a small speaker as shown below.

You could easily get a small speaker around you. It can be extracted from malfunctioning headphone, earphone, mobile phone.
The speakers I used are below.
https://www.aliexpress.com/item/2pcs-1W8ohm-MP3-MP4-small-horn-Ramos-v2-0-10-15-oval-speaker-W10/32779312057.html?spm


2.How to use

Below is a picture of my development board.  I put a very small speaker on Mic for testing.
On the main screen, touch 'Audo DSP' button.


If you turn on your transceiver, you will probably see fft spectrum and waterfall graphs as shown below.
In the first run, it operates in 'Pass Through' mode.

May be too loud, so make sure the volume of the transceiver is very small in 'Pass through' mode.



Touch the desired filter button.
If you are filtering a fairly narrow area, please select BPF.
BPF supports 50Hz, 100Hz and 150Hz filtering.
Continue to touch the BPF button to change the filtering bandwidth.

Touch the red squares (B) below to move the center frequency.
The yellow squares(A) is the area to adjust the bandwidth in User Filter mode.

Move the center frequency to the area you want to hear.
If you hear a small noise when moving to the area you want to hear, increase the volume of the transceiver.
Since most of the other areas are removed, if you raise the volume, you will hear what you want to qso. Volume control is important.


If you have selected User Filter, you can select the range you want to hear by dragging the L and R areas below.



Since the center frequency is maintained even if you touch the BPF and the User filter alternately, it can be used alternately according to the communication status.


3.Test Video
Please refer to the video below for an example of use.



Thank you for reading
Ian KD8CEC