[TenTec] Ten Tec Centaur 411 10m Mod Needed

[Bob McGraw - K4TAX]

The filter is a Low Pass filter with a nominal cut-off at about 23 MHz or 
slightly above 15M.  As designed this prevents operation above this 
frequency being on the 12/10M  bands.  This filter also provides attenuation 
of harmonics above the designed cut-off frequency.  Now with the 12/10M 
filter installed the cut-off is raised to about 32 MHz thus allowing 
operation on 12/10M and yet  still providing adequate attenuation of 
harmonics above that frequency.

Removing the filter and replacing it with a jumper will allow the amp to 
work on 12/10M but WILL NOT provide ANY harmonic attenuation.   Any 
harmonics, i.e. 2nd, 3rd, 4th,  could fall into one of the Public Service 
bands.  Should interference occur and the user complain to the FCC, a 
written explanation by the operator will be required.  Frankly, in this 
case, I can't think of an explanation that would be acceptable.  Just 
remember, it is your amp and your license.

73
Bob, K4TAX


----- Original Message ----- 
From: <w8au at sssnet.com>
To: <tentec at contesting.com>
Sent: Thursday, February 13, 2014 8:06 PM
Subject: Re: [TenTec] Ten Tec Centaur 411 10m Mod Needed


> At 02:48 PM 2/13/2014, Kris Merschrod wrote:
>>I did the mod from the schematic and parts that T-T sent on a perfboard - 
>>it really isn't much, but, before hand,  I pulled the 15 meter filter and 
>>put in a jumper wire - it worked like a charm w/o the filter - I am not 
>>sure what the harmonics on that looked like - others can do the hi-tech 
>>work :>)
>
> Ooops... there goes the FCC type approval.. ;-)  (hope your antenna was 
> selective)
>
> Perry   w8au
>
>
>
>
>
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