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Re: [TenTec] Centaur input SWR (Update)

To: steven4lq@gmail.com, tentec@contesting.com
Subject: Re: [TenTec] Centaur input SWR (Update)
From: Joe Papworth via TenTec <tentec@contesting.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Thu, 16 Feb 2017 11:54:37 -0500
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
The "extra" 81550 that came with the amp has those same 6 components.


-----Original Message-----
From: Steve Ellington <steven4lq@gmail.com>
To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Cc: Joe Papworth, K8MP <k8mp@aol.com>
Sent: Thu, Feb 16, 2017 11:50 am
Subject: Re: [TenTec] Centaur input SWR (Update)

I still have the original "standard" 81550 board from my Centurion amp. 3 
toroids and 3 caps. Same part number! 
The Centurion does have tuned input so it would have better matching etc. I can 
easily see how the Centaur would have some SWR.


On Thu, Feb 16, 2017 at 11:38 AM, Joe Papworth via TenTec 
<tentec@contesting.com> wrote:
I took a look at the input filter board and it's not an 81763. It's labeled as 
an 81550 but it is not loaded with the same components as the spare 81550 that 
came from the seller, nor does it match the 81550 in the manual.

I thought maybe the 81550 in the amp had modified to be an 81763 but the 
documentation for the 81763 says it should have two coils and 4 caps. The one 
in the amp only has one coil and a resistor in place of the second, along with 
only one cap.

Anyone have a clue what I'm dealing with here?

Thanks, Joe, K8MP


-----Original Message-----
From: Joe Papworth via TenTec <tentec@contesting.com>
To: tentec <tentec@contesting.com>
Cc: k8mp <k8mp@aol.com>
Sent: Thu, Feb 16, 2017 11:02 am
Subject: [TenTec] Centaur input SWR

I've been ignoring an input SWR problem on my Centaur for a while and decided 
to take a look at it today. 10 and 15 are higher than the others, (about 1.8 to 
1) The others range from 1.1 to 1.3 to 1. Is that typical? If not, the 81763 
10/15 meter optional filter board seems to be a likely culprit, but there's not 
much circuitry on it. Thanks, Joe, K8MP 
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