[TenTec] Ten-Tec 411 Centaur Amp Problem S-O-L-V-E-D

[Dr. Gerald N. Johnson]

I presume that TenTec has an FCC approved mod given out only to licensed 
hams that substitutes a different filter or your jumper. That series 
tuned trap in the present filter is probably resonant at 27 MHz to be 
sure it can't be driven easily on that band. The book also says the 
plate tank needs a modification for 10m. FCC rules preclude making that 
information generally available. Tentec may have to see a copy of your 
license.

The scematic shows a pi while there are three coils in the pictures.

Time to call tentec.

73, Jerry, K0CQ

On 6/5/2010 1:18 PM, Kris Merschrod wrote:
> Good afternoon,
>
> The problem seems to have been the input filter, exactly why I have not
> figured out.  I pulled that filter and put a jumper in its place and "bingo"
> no SWR on 40 (or the other bands) and full power out as it should.
>
> The "PI" filter (actually is more complicated than a PI - it has a third
> inductor and Capacitor to ground tapped from the middle of the inductor part
> of the PI.   I imagine that part is designed to pull certain higher
> frequencies to ground.
>
> Now I want to modify it so that it will OP on 10 and 12 Meters.  Has anyone
> gone through this MOD?
>
> Kris KM2KM
>
> Merschrod
> 123 Warren Road
> Ithaca, NY 14850
> www.merschrod.net
>
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