[TenTec] Ig drift on Titan 425

Gary Smith Gary at doctorgary.net
Sat Feb 7 15:29:40 EST 2009

> >I believe I have the opposite situation; In a key down state with 
> >high output, the IG drifts downward. After a brief moment of no key 
> >down, when I transmit, the Ig is so high that the meter will pin or 
> >if not pin, the overdrive light is bright. At lower input/output, IE; 
> >800W out, the drift is minimal.
> Are you using AGC to control the drive level?  You should NOT do that. 
> Ten Tec makes a point of this in their manual. ALWAYS set the drive 
> level using the power output control of the transceiver that drives it. 
> If you use ALC, use it ONLY as fall-back protection in the event that 
> something goes wrong. 

No, I've not used ALC to control anything, strictly the output power 
from the exciter.

I should have added that the frequency I tried that had no issue with 
Ig drift was 14 Mhz. I did not try any higher bands or 7MhZ to check 
for drift. Using the lower bands I definitely have a major issue with 
completely unreliable Ig results.


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