Wow! Great work guys! So this eliminates the need for an ARIB board and FXO/FXS board? I may finally get the chance to start tinkering with this now!! 73's Stephen K1LNX On 9/15/07, Stephen Rodgers <hwstar@rodgers.sdcoxmail.com> wrote:
Steve Henke, W9SH, and Jim Dixon have completed the coding of a new channel driver for asterisk named chan_usbradio.c which allows app_rpt to work with modified USB sound fobs based on the CM108 chip. There is an initial write up about this new hardware interface on my site at http://app-rpt.qrvc.com/usbsoundfob.html.
The USB channel driver has DSP code in it for CTCSS detection and generation, squelch, pre-emphasis and de-emphasis, audio level setting, and soft limiting. You only need to make 3 connections to a repeater. Discriminator audio, transmit audio. and PTT. A COR input is supported, but not required.
The hardware is really inexpensive! USB sound fobs can be bought for $7.95 at places like geeks.com. You will need 3 resistors, a Shottky diode, and an NPN transistor in order to complete the modification.
A schematic detailing the modifications and pictures of the USB sound fob before and after modification are posted on at the URL above.
I am working on a set of detailed modification instructions with pictures so that those who want to use this interface can modify the USB sound fob themselves.
Have Fun!
Steve Rodgers, WA6ZFT _______________________________________________ App_rpt mailing list App_rpt@lists.illiana.net http://lists.illiana.net/mailman/listinfo/app_rpt
-- Stephen Brown - ARS K1LNX Johnson City, TN EM86uh