[TenTec] TenTec Digest, Vol 53, Issue 35

[Ken Brown]

Hi Jim,

Connecting up the Omni VI, Hercules II and 253 autotuner (I presume, 
because that is the only Ten-Tec autotuner I know of) according to the 
Ten-Tec manuals ought to work, with no damage to any of the gear. It is 
all designed to work together. Unfortunately though, it may not.

The instructions tell you to connect the keying loop through the Exciter 
In and Exciter Out jacks on the 253. This allows the 253 to disable the 
exciter RF output in the event of a fault condition (determined by the 
tuner). This sounds like a good idea, however the relay that breaks the 
keying loop, K6 is on the same PC board as the SWR bridge, and easily 
gets RF coupled into the keying loop. This resulted in a keying lockup 
at my station, an exactly opposite condition from what the circuit is 
trying to accomplish. There was no permanent damage. The keying output 
transistor was not blown, nor were any other parts. Yet I could connect 
the keying loop through the 253 as shown in the documentation.

Someday I intend to fix this problem. Haven't go a round tuit yet.

N6KB

Jim WA9YSD wrote:
> Well, I have an OMNI VI Plus  wired to a Ten-Tec Herculed II and aTen-Tec Automatic Antenna Coupler through a Ten-Tec wireing harness.  I was keying the OmniVI plus with and AEA MorisMatic MM-2 keyer.  This is the Third time the Keyer circuit in the OmniVI Plus went out.  I had also used Twice Ten-Tec repaired it.  Any Ideas?  External isolators for the keying circuit, is that the right thing to do?
>    
>   I have also used the Unified Microsystems UCW-100 USB to CW & PTT Interface and the same thing happend.  This has an optical isolator.  Seams to be something ealse.
>
>
> Keep The Faith, Jim WA9YSD
>        
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