[TenTec] relay delay in Tentec QSK amps

[Jim Brown K9YC]

On Tue, 4 Dec 2007 18:12:19 -0800, Allan Taylor wrote:

>I am considering purchasing an Elecraft K3. This radio does not,
>unfortunately, have a QSK keying loop to directly interface with 
>my Tentec amps. 

Hi Alan,

I use my Herc II and Titan 425's by keying the amp and letting it 
key the radio. That works very well (full QSK) with everything I've 
tried -- Omni V, TS850, FT1000MP. The only downside is that I must 
use some external keyer rather than the keyer built into the radio. 
That's why I own several vintage AEA MM1's and an MM3. 

It's also very easy to add diode summing networks to combine the 
keyer with the computer keying line (like the K2 does). I build 
these networks into the output of the keyer (which comes with 
several spare RCA jacks that work nicely for this purpose). One 
caution -- you may need to use Germanium diodes with the Herc II and 
some radios. I did with the MP, which needs the keying line pulled 
closer to zero for keydown than the other radios. 

73,

Jim K9YC