The transceiver that I use as a receiver: www.cqham.ru/forum/showthread.php?26438-%D2%F0%E0%ED%F1%E8%E2%E5%F0-SW2013_3&highlight=%F2%F0%E0%ED%F1%E8%E2%E5%F0+sw2013 Transmitter: well-known design on a 74HC240 microcircuit.
@@G7VFY Hi Stephen! g-2b.com/ur5ufq/qrp/qrp.html qrp.ru/forum/9-%D0%A1%D0%B0%D0%BC%D0%BE%D0%B4%D0%B5%D0%BB%D1%8C%D0%BD%D0%B0%D1%8F-%D1%82%D0%B5%D1%85%D0%BD%D0%B8%D0%BA%D0%B0/3572-%D0%9F%D1%80%D0%BE%D1%81%D1%82%D0%BE%D0%B9-%D1%82%D0%B5%D0%BB%D0%B5%D0%B3%D1%80%D0%B0%D1%84%D0%BD%D1%8B%D0%B9-%D0%BF%D0%B5%D1%80%D0%B5%D0%B4%D0%B0%D1%82%D1%87%D0%B8%D0%BA?start=84