Masters Communications has released a new USB radio adapter compatible with AllStar Link - the RA-42.  This adapter is patterned after our popular RA-35, but it includes two extra control potentiometers for mechanically setting the TX audio levels, and it has a open collector logic output (sourced from either GPIO 4 or 8) intended for gating a hardware CTCSS encoder.  This GPIO logic output also drives a LED which illuminates upon asserting the GPIO high.  While the adapter is designed for TX CTCSS logic control, the logic output can be used for anything that an open collector NPN BJT can switch - even keying a relay. Any software can be used as long as it has the capability of toggling the GPIO of the CM119A.  This logic is jumper enabled, and can be routed to pin 7 on the DB9 connector.  Since there aren't enough pins on the DB9 to bring this function out to its own individual pin, its routed to the DB9 as a jumper selectable option. One position (JU3-A) puts the internal controls revert option to pin 7, while JU3-B puts the TX CTCSS logic to DB9 pin 7. If a user only wanted a LED as a status indicator, the jumper position is unimportant, as the yellow LED will illuminate no matter the position or existence of JU3. This function and logic output can be used for other things needing a buffered GPIO; it's not necessarily a TX CTCSS only function. Simply program your system to toggle either GPIO 8 [default] (or GPIO 4 by re-configuring the jumper), and the logic developed will follow. More can be seen by going to the web site and selecting the RA-42 link.  The product is available immediately, and, as always, there's easy PayPal ordering. http://www.masterscommunications.com/ Please refresh your browser if you don't see the link. Questions or comments welcomed. Thanks, Kevin W3KKC