Rs232/USB 1200 Baud Modem: Project & Kit

Hamcom Interface : Project & Kits

1200 Baud External Power Modem: Project Details Only

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Model: FD-RM1

This modem is a true 1200-baud Bell 202 using a MX614 from Maxcom, making it ideal modem for VHF & Satellite digital work. Modem is self-powered as it takes power from either RS232 Com port of USB port.

MX614 is a low voltage low current modem chip. This modem is powered from RS232 or USB port. (Just like good old Hamcom!!)  Headers are required to be properly installed to select source of power: from a Com port or from an USB port.

For USB operation, a surface mounted FT232RL is used. This Chip includes crystal oscillator and requires minimum of external components:

Only required data Pins are used on PCB. BayCom Type Software Modem Requires : RTS, DTR & CTS. 

Please refer to FT232RL datasheet for details on use of C1 & C3, which may be installed to reduce EMI coming from USB port and so is C2, a 1000pf ceramic.

USB drivers for Win/Linux etc may be installed directly from FTDICHIP. When installed, these drivers create a virtual come port for your PC (com 3, 4, 5 etc)

Modem has front panel DIN5 connector to connect it to Rig Microphone and PTT line. A male connector is supplied with Kits to speed up Digital Mode setup. 

Basically this is RS232 Port Powered Radio Modem. USB is supported by using a RS232-USB Bridge Chip, which finally creates RS232 type of data lines.

Modem is presently available in RS232 Kits with Headers configured for RS232. USB chip version will be available soon. However, RS232 versions may be updated anytime by simply installing an FTDICHIP FT232RL chip.

Schematic, Parts List Detailed Documents and USB Drivers are provided here for download.

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Note: 

USB modem kit comes with all RS232 parts with addition of an FTDI232RL chip and an USB Connector. FT232 chip is not supplied pre-soldered on PCB.

In RS232 Kits, only USB Chip & USB connector are not included.