[TenTec] Tentec XCVR Keying Loop and Amp Supply Amp Question?

[Jim Brown K9YC]

On Fri, 04 Dec 2009 11:03:33 -0700, Doug Smith wrote:

>I've never been able to key the amp's QSK line with anything with a
>solid state output.

I've had sucess keying rigs and amps that were difficult to key by 
pushing the external keying transistor further into saturation. For 
example, when keying the rig from a computer on the DTR line, you 
use a simple NPN inverter to drive the keying circuit. Simply 
lowering the value of the base resistor reduces Vce-sat enough to 
key the rig reliably. I had this problem keying an FT1000MP from a 
stock Hercules II, and successfully used the same fix in the base of 
the transistor that provides key out from the Herc II. 

73,

Jim K9YC