Re: hacking bitx40 for 20 metre #bitx40
The latest Raduino sketch v1.28 provides this feature:
Prevention of out-of-band transmissions
The software restricts transmission to the 40m ham band allocation. By default this is ITU region 2 (Americas: 7000-7300 kHz). If you are located in a different ITU region, uncomment ONE of the lines 44-47 depending on your location, and recompile.
If the PTTsense-mod is installed, out-of-band TX will be disabled, but RX is still possible outside the band. If the PTTsense-mod is NOT installed, both TX as well as RX will be disabled outside the band.
Download it from https://github.com/amunters/bitx40
73 Allard PE1NWL