23cm NBFM transceiver
Update 17 july 2019 Uploaded v4.1, with the following changes:
- added support for the fractional N pll ADF4153, selectable in the .h file
- added support for a sequencer on PD7 for swiching an external coaxrelais in case of higer power with a PA
- some minor changes over time
These files are the sources for my design of the 23cm NBFM transceiver. For more information or a complete kit please visit www.pe1jpd.nl. The development environment is AVR Studio 4 from Atmel. The processor is an ATMEGA328 with default, factory fuse settings. The file spectrum.c is linked but commented out in the menu because 1MHz default clock frequency is just too slow to be useful.
Please check the first lines in 23nbfm.h for configuration options. Please note that BOARD1 is only included for some initial prototype boards, normally you should use BOARD2.
Update january 2019:
Via a #define setting in the h-file you can now choose the type of PLL: ADF4113 or ADF4153. The ADF4113 is no longer manufactured, and the ADF4153 is a modern fractional N PLL with which frequency steps of 1 kHz are possible. The default is however still set on 25 kHz. With the unchanged loop filter the new PLL locks ok, but low frequencies of the modulated audio are less pronounced. This effects also in the CTCSS, which is now much weaker. Some experiments with parts in the loop filter are useful.
73 de Bas, PE1JPD
Hi all,
from 13 july 2020 I have started to update the version V4.1 from Bas. The development environment is AtmelStudio 7.0. For more information please visit www.mdtweb.de.
The first thing what I have done was to implement an LCD with 4 x 20 characters and updated software to use it. Furtheron I have implementet following changes to the software:
- 4.2 LCD 4x20 ... 13-07-20 wm DG8WM
- 4.2 Frequency Adjust +-999 KHz 14-07-20 wm
- 4.2 Frequency Adjust +-200 KHz 16-07-20 wm
- 4.2 Display Squelch, Shift, Step 16-07-20 wm
- 4.2 max. Step 1000 KHz 16-07-20 wm
- 4.2 New Encoder Handling 18-07-20 wm
- 4.2 Display RSSI value in dBm 19-07-20 wm
- 4.2 "V"FO Problem cleared 20-07-20 wm
- 4.2 Display reverse mode 20-07-20 wm
- 4.2 Added "Hz" to CTCSS 21-07-20 wm
- 4.2 2-line LCD improved 28-07-20 wm
- 4.2 RSSI Display improved 28-07-20 wm
- 4.2 Update Parameters in Memory Mode 30-07-20 wm
- 4.2 Write only to eeprom, if value has changed 30-07-20 wm
- 4.3 Write eeprom, correction (int)shift 12-08-20 wm
- 4.3 Correction step down 12-08-20 wm
- 4.3 Display in Memory Mode 'CTCSS', VFO Mode 'Step' 12-08-20 wm
- 4.4 Change SEQ from PD7 to PB2 17-08-20 wm
- 4.4 1750 Hz Tone PD7 17-08-20 wm
- 4.4 Double click PTT for 1750 Hz tone 20-08-20 wm
'#define LCD_20x4' delete this for 2-line LCD in 23nbfm.h '#define PB2_SEQ' for use PB2 and not PD7 for SEQ, PD7 is used for 1750 Hz '#define TONE_1750' and '#define PB2_SEQ' for use 1750 Hz on PD7
73 de Werner, DG8WM