[TenTec] Argonaut/Titan III

[Jim Brown]

On Wed, 21 Jul 2004 10:11:51 -0700, NJ0IP wrote:

>I think you should tap onto the "T" signal in the Argonaut V as the signal
>to key the Amp.  I did this with an old Argonaut 509, running the 405
>amplifier.  I'm not an engineer so I "stole" ideas from other rig's
>circuits.  My keying unit ended up being 3 transistors and a 25K Ohm
>variable to addjust the delay for returning the amp to RX.

I am using the T-line to key my Hercules (original) from my Omni V, 
because it is specifcally designed to be keyed by the T-line of the original 
Omni-series rigs. It's a very simple mod to go inside the Omni V, find the T-
line, and bring it out. I removed the remote speaker jack and brought the T-
line out on a BNC that fits in that hole. No relays, no transistors, just a 
simple jumper from the T-line to the keying input of the Hercules. 

But that is the WRONG way to key later Ten Tec amps (that is, everything 
but the original Hercules, which was built in the early 80's). The right way to 
key Ten Tec amps is to key the amp directly, then let the amp key the 
radio. This provides the proper delays, and is completely painless. That's 
how I'm keying my Titan 425. Anything else (including what you are 
suggesting) is unnecessarily complicated.

Jim Brown  K9YC