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[TenTec] Centurion Oscillation

To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Subject: [TenTec] Centurion Oscillation
From: "Henry Pfizenmayer" <pfizenmayer@worldnet.att.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Fri, 7 Oct 2005 20:43:52 -0700
List-post: <mailto:tentec@contesting.com>
By any chance has anyone experienced self oscillation with a Centurion  key 
up after application and removal of drive ? Mine has decided to do this on 
40 meters only (into a good 50 ohm dummy load). It is fine on all other 
bands. On 40 it appears to tune normally and have normal power out but key 
up it continues to put out about 250 watts PF and PR on the internal meter 
(nothing is coming out of the amp because the TR  relay  is in  receive.) 
Have not determined the freq of oscillation as of right now. Input SWR seems 
about normal 1.4 worst case on 40 .

 Once its oscillating - makes no difference if its in operate or standby . 
You can kill it by pulling the key lines - or by turinig the Orion off. (no- 
the Orion is not putting out power key up - and have tried changing the qsk 
delays)


 Using Orion driver - have tried changing to ant 2 and keying loop 2 - no 
difference. Orion seems perfectly normal in all respects. (output power does 
not hang on any band )

Have checked the Centurion input filter band switching voltage to the lpf 
board and it is switching ok.  Have the  lpf board out , all solder 
connections look fine , 40 meter filter has continuity  - will check the 
relay tomorrow .

 Just wonder if anyone has seen this . TT has not seen this and I have tried 
several things they suggested on a couple different calls.

Rgds-- Hank K7HP 


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