[TenTec] Ten tec Onni 6 Logic board

Clayton Brantley clayton_n4ev at yahoo.com
Wed Jul 20 18:39:59 PDT 2011


I'll be glad to work with the drawings with you or any other way I can help out.

My O6 rev 3 developed a problem some time ago and I have worked  on it on and off for a year now.
The PLL remains stuck at 5.5 mhz but the digits say we are tuning.  Some time after Sept I'll box it up
or drive up and drop it off.  You're not that far away.  I'm in Myrtle Beach.

Let me know how to help out.  I do have some electronics background from my work in Oak Ridge, TN
where I built quite a bit of equipment to work with our fusion energy experiments.  I just do not have the
test gear that I used to have on my test bench.  

I do have a Jupiter running now so the O6 can sit idle a bit longer.  I am very interested in getting it working
again and looking at some of the things mentioned in the TenTec Wiki page.

73's Clayton N4EV

From: Glenn <wa4aos at aol.com>
To: tentec at contesting.com
Sent: Wednesday, July 20, 2011 1:36 PM
Subject: [TenTec] Ten tec Onni 6 Logic board

Hi Group,

Based on the lack of response to my previous post regarding a possible NEW replacement logic board for the Omni 6, I have put that project on the back burner for now.
That would be a daunting task and not one I am willing to invest time and lots of money into unless there is more interest at some point. So, the next best solution is gearing up for repairs and mods to the existing 
logic boards since Ten Tec is now sending some home as unrepairable. If this is ever going to happen, now is the time to do so.

My only reason for looking into this is my affection for the Omni 6 series radios. I am not enamored with DSP IF derived configurations yet, and personally have great respect for the performance of the O6. The O6 with the INRAD roofing filter is awesome. 

Part 1:  I looking for Omni 6 version 1, 2 , 3 or 6+ as well as Paragon's  and Paragon II's that are either lightning damaged, or otherwise unrepairable. 
Cosmetic condition is not too important; just not any that really were used as boat anchors or shotgun target practice..
These will be used for test beds to repair logic, AF/IFboards and PA's and free up my personal equipment. Also looking for units to be parts queens.
Let me know what you have and a REASONABLE price. Donations going toward Logic board support are always appreciated.

Part 2:  I have found a source for the DSP and RTC Ic's on the Omni 6 Logic board. and have ordered a large quantity of these as well as the rest of the IC's on the Omni 6+ logic board.

Is there interest in an IC kit for the Omni 6+?

I can tell you most of the IC's are soldered in and unless you have experience and equipment, replacing the IC's is not recommended. 
Of course, there is no reason to replace any of the IC's if your board is working properly. This is not like shotgunning all of the tubes in an old Hallicrafters receiver. Hi Hi
My point in offering a kit of spare IC's is the risk of not being able to find them later. I was VERY LUCKY to find some of the parts I did find.  

I have one O6+ and one Paragon logic board that I have installed gold plated, machined sockets for each IC on the board to use as a test board to QC inventory and possibly to verify questionable parts for a board being repaired.

Part 3:  The schematic in my Omni 6+ manuals and the one online at the Ten Tec site  has a number of errors. Does anyone have a correct Omni 6 or plus manual that is correct? Check the wiring of U15 and U16 or locate U23 in the parts list or buzz out the location of the crystal used for the RTC, that's for starts. Try to follow the address or data lines around the board????? I think they were trying to confuse the communist, sure worked on me.. Hi Hi

I have started the task of rewritting the schematic. Is anyone willing to do some of the work? If there is a real desire to keep these running well into he future we need parts and accurate docs. I have also made large clear color pics mapping the location of all IC's, connectors and transistors. This is a set of 3 pics, one for each component type. I have over 18 hours doing this alone. I have also made and excel spread sheet listing all of the IC's,correctly, their descriptions and board locations as well as my source, as of now for the vendors who have these. Next is mapping out all of the electrolytic cap's which will soon be very dated.

I am documenting bus data and saving files with my logic analyzer as I stimulate functions from the front panel as well as logging pulse states with my digital O scope to use as a comparison for testing boards with problems. So far, I have identified about 85 significant logic states to aid in troubleshooting. This was a major time saver on one of the Omni 6 boards that I recently repaired after Ten Tec had declined to effect the repair for a guy in TX.

Any suggestions or assistance will be appreciated.


Glenn WA4AOS
DSM Labs
Laurens, SC
w w w dot d s m l a b s dot c o m 

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