An 80 Metre QRP SSB Transceiver
This transceiver is not really a 'transceiver' in the true sense. It is, in fact, a separate transmitter and receiver with a common VFO as well as some transmit/receive control circuits. The I.F. frequency for the transmitter is 1.65 MHz and is 9 MHz for the receiver. The Arduino controlled AD9850 DDS VFO shifts in frequency and direction when going from receive to transmit modes. Receive VFO = RF-IF  (3.5-1.65=1.85MHz) and Transmit VFO = (9-3.5=5.5MHz)

The transmitter RF output power is 8 Watts and the receiver has a reasonable sensitivity as it uses an SA612AN for the front end/mixer stages.