BayCom Standard Modem for RS-232

This is our standard do-it-yourself modem. It uses the TCM3105 modem chip and is usable for 1200Bd operation on VHF/UHF bands. As an option, a tone squelch DCD extension can be added, using the EXAR 2211 PLL IC (shown on the second photo). For the BayCom terminal program, this is only recommended, when a very slow IBM XT is used. Else, the software DCD of BayCom V. 1.60 can be used. For other software running with the serial modem, the DCD may be required, if no software DCD is implemented. The DCD extension can also be used for other modems, because it fits directly into the TCM3105 socket. Size of the modem: 90 * 44 * 24 mm. 9-pin Sub-D-Connector (female) for the RS-232 interface, 5 pin DIN connector for radio connection.