Hi Sirs, we are designing a Marine Radio Beacon receiver
Currently we are using Anytone 555 Radio but we should design our own to enter asiatic market
Beacons transmit 26 to 28 mhz SSB FSK (upper or lower, configurable) mark frecuency 1500 hz, space frecuency 2000 hz, modulated at the beacon by ad9954 DDS
We want to star designing the receiver in two separate boards S1 and S2
This proyect is very important for us
Please review S1 board (schematic hereunder)
Wich relation should be between LO input and RF Input ?


