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eHam Forums => Amplifiers => Topic started by: G0TOO on September 13, 2003, 06:43:15 PM



Title: Icom IC910 ALC connection
Post by: G0TOO on September 13, 2003, 06:43:15 PM
Hi All

Does anyone know if the ACC socket has a line that either shorts to ground for a line that has a voltage output but only when the rig is in transmit mode, this is to switch the acl on a linear amp so as to bypass the preamp.

Cheers Chris - G0TOO


Title: Icom IC910 ALC connection
Post by: K0BG on September 14, 2003, 05:59:55 PM
Your description is a bit vague...

Most all Icom rigs which have accessory jacks have an output (or input as it were) that goes to ground on transmit (or will cause the rig to transmit if taken to ground). On different rigs it is a different jack pin. In any case, this "line" can only sink 20 mils, so some provision must be made to limit the current to less than this amount.

Most ancillory equipment designed to interface with this "line" use a FET to do the switching whether it controls a relay, PTT, or what-have-you.

Alan, KØBG