Pa key shaping circuit -Software-based, all-digital SDR receiver stage (optional): samples the I/Q (complex) signal from the digital mixer from the square sampling detector, and perform a 90 degree phase shift in the software (hilber transform) and eliminate one by adding sidebands -Three independently switchable analog front receiver faders (0db, -13db, -20db, -33db, -53db, -60db, -73db) - MDS receiver noise level: -135 dbm (200hz bw) to 28mhz - Receiver front selectivity: Steep tuning frequency -45db/ten times roll-off/-2khz - Lock dynamic range: 20khz offset 123db, 2khz offset 78db - CW decoder, straight/iambic-a/b keyboard -Vfo a/b scrit and split, and switch the corresponding relay band filter via i2c -Support for cat (TS480 subset), you can stream audio, press keys and display text through cat -This is probably the most economical and easiest to build standalone SDR/SSB transceiver. Great simplification simplifies the original QCX circuit i.Reduces installation components by 50%, reduces installation components by 50%, does not require complex transformer windings and does not require alignment procedures, and is more versatile Port introduction: -Charge: Built-in lithium battery charging port and you can only use the charger provided! It is forbidden to use other chargers! -Switch: off to turn off. Bat: Built-in battery power supply. 13.8: external power supply -DC13.8v/3a: external power supply port -Key: Automatic key body connection (A, B, single key) -Pa: external power amplifier, PTT signal -Microphone: External microphone port -Uart: serial communication port (osmo compatible) -Spk: external speaker Package included: 1 x Transceiver 1 x Power Adapter 1 x Mic 1 x 3 in 1 screwdriver. My goal is to make sure you are a happy customer and pleasant shopping with us. Sometimes shiping time may has a little delay, such as Bad wether, Holidays. We stand behind everything that we sell and will do everything possible to assure you are satisfied. Buyers are responsible for the postal cost of returning the items. We must be notified of the intent to return your item within 30 days of receiving the item. How to return 1, Please ask us for return address. We strive to answer all questions and resolve any problems as quickly as possible.