Roger, I'm not sure what your Centurion problem was, but the T-4X *has* a set of relay contacts available to key an amplifier. These are brought out through the power supply, and is called VOX RELAY, although they operate whenever the transmitter is placed in transmit mode whether by PTT, VOX, or MOX. Typically this is all you need to operate the T/R relay built into the amplifier.
ACG (also known as ALC in the case of a transmitter) is a threshold-based gain control voltage intended to be fed back to the transmitter. It has nothing to do with placing the amplifier or the radio in transmit mode. "Nothing" will happen until the set point is reached. It is not a continuously operating compression signal as is found in some more modern rigs (which does tend to cause unwanted distortion products). Despite claims to the otherwise, there are some very good technical reasons to use ALC. (Please trim your replies when responding to digest messages, your response was difficult to find in the text of the entire digest message). 73 -Jim NU0C On Mon, 11 Feb 2013 13:24:34 -0800, Roger Smith wrote: >Paul, I have a Ten Tec Centurion amp and ran into the same problem. It >appears that an external TX relay switch is needed to make it work. My >manual says to use a DOW-KEY, DK-6Q-G2C or other similar relay. The T-4X >series is designed to interface with the L-4B amp and uses the AGC and >Vox to switch the amp. > >Roger -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! "Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime." HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
