Symek TNC21s Front

TNC21S 1200 BAUD AFSK PACKET RADIO CONTROLLER
For Radio Amateurs and CB-Radio users, we offer a tiny, low cost Packet-Radio-Controller for the common 1200 Baud AFSK modulation. The Controller can be used with every FM-Radio CB, VHF, UHF and is simply connected to the speaker output and microphone input. The TNC21 works with every computer which has a RS232 serial interface. A Terminal Program for PC MS-DOS and Windows is included.

As the TNC21S works with a own microprocessor, it can receive and store data and act as a digipeater even when the computer is off or when the terminal program is not active. As the TNC21 is fully EPROM compatible to all TNC2 clones, other EPROMS / Firmware like TAPR, DRSI, SMACK, Net-ROM, WA8DED, TNN, Nord><Link etc. can be used. TNC21S is in use in thousands of amateur radio shacks and is also standard Packet Controller for CB 27 MHz. However, there exists many commercial applications for the TNC21S as remote control, remote measuring and general wireless data exchange.

Symek TNC21s Opened

TECHNICAL DATA OF THE TNC 21S
Dimensions: 110 x 90 x 35 mm, weight 300g. Reliable SMD printed circuit board. CPU: Z80 CMOS CPU and Z80 CMOS SIO, Clock 4.9 MHz, 32 KB Ram, 27C256 or 512 EPROM on 28 pin DIL socket, MAX691 super visory IC and battery switch, MAX232 RS232-Interface. Modem: TCM3105 AFSK Modem Bell 202, Quartz controlled, separate DCD circuit with XR2211 PLL. Radio-Connection: 5-pin DIN Connector: Speaker 0.2 V to 10 V, Output 20 mV to 1V at 2 kOhm adjustable,

PTT switch with 20 s watchdog max 16 V 0.1 A. RS232 serial Interface: 25 pin Sub-D socket, Baudrate 9600 Baud internal jumpers for 1200 to 19200 Baud. Displays: 5 LEDs for Power, Transmit PTT, Carrier DCD, Connect CON, Status STA. Power Supply: 12 V DC 9 to 16V, 60 mA. EMC: the TNC21S is perfectly shielded by a double metal case. All connections radio, RS232 and power are rf-filtered by lowpass filters to avoid any electro magnetic interferences with the radio.

MORE INFO ABOUT THE SYMEK PACKET RADIO MODEMS YOU CAN FIND AT:  HTTP://WWW.SYMEK.DE