[Amps] T-T Titan with Pro III Question

[Jim Brown]

On 5/26/2011 9:02 AM, Bob Arenella wrote:
> Anyone using a Titan 425 with a Pro III? Is it necessary to use a
> keying buffer between the rig&  amp?

The control inputs of the Titan 425 are the base of a chip that you pull 
to ground to put in TX mode.  It draws VERY little current, and it's not 
bitchy about how good the pull to ground is.

You can download pdf schematics at http://audiosystemsgroup.com/publish.htm

There CAN be an issue with TIMING of the keying. The Titan won't let you 
transmit until the TR relay has pulled in, and that takes about 8-10 
msec. Most modern rigs have that delay built in -- they delay RF output 
by approximately that amount after the DC keying signal for the amp. 
Dunno about the Pro III in that regard.  My Titans are fine with TS850, 
FT1000MP, K2, and K3, even doing full QSK.  I don't run QSK much 
anymore, because I do lots of contesting and would have to replace 
relays every few years. I've gotten lazy in my old age.

73, Jim K9YC