[TenTec] OMNI C Mixer or PTO problem

Mon Feb 20 13:43:19 PST 2012

Mike,

Are you sure there is no ACCESSORIES jack on the rear panel. It is a 9-pin 
Molex connector. If it is not there, then you are right, there will be no 
jumper. The manual for the OMNI A clearly has this jack. I do not understand 
why an upgrade would not also have it.

Joe
----- Original Message ----- 
From: "Michael Silevitch" <msilevitch at coe.neu.edu>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Monday, February 20, 2012 3:36 PM
Subject: Re: [TenTec] OMNI C Mixer or PTO problem

> Dear Joe
>
> I hope you and Gary are right. I'll give Ten Tec a call on this tomorrow. 
> As I said to Gary there is no reference to the accessories jumper in the 
> Omni C manual. There are at least two references to it in the Corsair 
> manual.
>
> Regards
>   Mike
>
> Sent from my iPhone
>
> On Feb 20, 2012, at 4:27 PM, "Joe" <joe at n4yg.com> wrote:
>
>> Did you see the post by Gary, AB9M. I still think there is an accessory 
>> jack
>> and that a jumper is required.
>> ----- Original Message ----- 
>> From: "Michael Silevitch" <msilevitch at coe.neu.edu>
>> To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
>> Cc: "Michael Silevitch" <msilevitch at coe.neu.edu>
>> Sent: Monday, February 20, 2012 2:46 PM
>> Subject: Re: [TenTec] OMNI C Mixer or PTO problem
>>
>>
>>> Dear Joe
>>>
>>> I'll look into the external VFO question. I have the manuals for both 
>>> the
>>> 243 and the 263 so that should tell me something. Also I son't see that
>>> there is a jumper needed on the accessories socket like the Corsair has. 
>>> I
>>> could be wrong about this but that's what is seems to be.
>>>
>>> Regards
>>>        Mike
>>>
>>>
>>>
>>> On 2/20/12 1:35 PM, "Joe" <joe at n4yg.com> wrote:
>>>
>>>> Well Mike, I guess the next thing to do is to see if there is anything
>>>> coming out of the PTO. You could use one of the scopes that everyone 
>>>> has
>>>> been talking about or an RF probe. It is looking like the PTO may have 
>>>> no
>>>> output. You can check that at the VFO OUT jack on the rear. That brings
>>>> up
>>>> an interesting question. If there is no way to turn the PTO off, how do
>>>> they
>>>> handle remote VFOs?
>>>>
>>>> ----- Original Message -----
>>>> From: "Michael Silevitch" <msilevitch at coe.neu.edu>
>>>> To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
>>>> Cc: "Michael Silevitch" <msilevitch at coe.neu.edu>
>>>> Sent: Monday, February 20, 2012 11:45 AM
>>>> Subject: Re: [TenTec] OMNI C Mixer or PTO problem
>>>>
>>>>
>>>>> Dear Joe
>>>>>
>>>>> That's unfortunately right. The OMNI PTO circuitry does not have an
>>>>> Enable
>>>>> line. The Corsair does.
>>>>>
>>>>> Any other wisdom?
>>>>>
>>>>> Regards
>>>>>        Mike K1PEV
>>>>>
>>>>> ****************************************
>>>>>
>>>>>
>>>>>
>>>>> On 2/20/12 9:22 AM, "Joe" <joe at n4yg.com> wrote:
>>>>>
>>>>>> I guess I made have assumed too much Mike. I thought all the later 
>>>>>> PTOs
>>>>>> had
>>>>>> an E terminial which allowed the PTO to be rapidly switched on and 
>>>>>> off
>>>>>> when
>>>>>> a remote VFO is used. If the OMNI does not have an accessory jack, 
>>>>>> then
>>>>>> you
>>>>>> can probably disregard  all of what I said.
>>>>>>
>>>>>> Joe
>>>>>> ----- Original Message -----
>>>>>> From: "Michael Silevitch" <msilevitch at coe.neu.edu>
>>>>>> To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
>>>>>> Cc: "Michael Silevitch" <msilevitch at coe.neu.edu>
>>>>>> Sent: Monday, February 20, 2012 8:06 AM
>>>>>> Subject: Re: [TenTec] OMNI C Mixer or PTO problem
>>>>>>
>>>>>>
>>>>>>> Dear Joe
>>>>>>>
>>>>>>> This sounds encouraging but can you give me a bit more detail? The
>>>>>>> OMNI
>>>>>>> schematic doesn't indicate an E reference. The PTO block only has a
>>>>>>> few
>>>>>>> outputs (VFO out, VFO shift and OT). None of these are linked to the
>>>>>>> accessories socket. Also the manual doesn't mention that a jumper is
>>>>>>> needed on the accessories socket. The Corsair does have a jumper
>>>>>>> installed
>>>>>>> when not using an external VFO. What pins on the socket need to be
>>>>>>> jumped?
>>>>>>>
>>>>>>> Regards
>>>>>>>        Mike K1PEV
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> On 2/20/12 8:38 AM, "Joe" <joe at n4yg.com> wrote:
>>>>>>>
>>>>>>>> Check the E voltage at the PTO. If this voltage is not about 8 
>>>>>>>> volts,
>>>>>>>> the
>>>>>>>> PTO is disabled. The E voltage is jumpered at the ACCESSORY jack on
>>>>>>>> the
>>>>>>>> rear
>>>>>>>> panel. If it is not jumpered, the PTO will not have the E (Enable)
>>>>>>>> present
>>>>>>>> will thus be disabled.
>>>>>>>> ----- Original Message -----
>>>>>>>> From: "Michael Silevitch" <msilevitch at coe.neu.edu>
>>>>>>>> To: <tentec at contesting.com>
>>>>>>>> Cc: "Michael Silevitch" <msilevitch at coe.neu.edu>
>>>>>>>> Sent: Monday, February 20, 2012 7:18 AM
>>>>>>>> Subject: [TenTec] OMNI C Mixer or PTO problem
>>>>>>>>
>>>>>>>>
>>>>>>>>>
>>>>>>>>> I am trying to understand a problem with my newly purchased OMNI 
>>>>>>>>> C.
>>>>>>>>> It
>>>>>>>>> was
>>>>>>>>> operating fine according to the person who sold it to me (and I
>>>>>>>>> believe
>>>>>>>>> him!). Upon arrival it seems that the PTO has no output or there 
>>>>>>>>> is
>>>>>>>>> a
>>>>>>>>> problem mixing the PTO signal. The reason I say this is because I 
>>>>>>>>> am
>>>>>>>>> observing displays of 9MHz, 1 MHz or 91MHz depending on the band.
>>>>>>>>> There
>>>>>>>>> is
>>>>>>>>> no transmitter drive current. According to the manual the display
>>>>>>>>> output
>>>>>>>>> is
>>>>>>>>> a sign that mixing with the PTO is not occurring. I assume this 
>>>>>>>>> also
>>>>>>>>> correlates with no transmitter current. I think (hope) the problem
>>>>>>>>> is
>>>>>>>>> something simple that was caused by the rough and tumble of
>>>>>>>>> shipping.
>>>>>>>>> I
>>>>>>>>> did
>>>>>>>>> try things like testing the VFO out-in jumper, jiggling cables,
>>>>>>>>> leaving
>>>>>>>>> the
>>>>>>>>> unit on overnight, etc. I do have the option of shipping the unit
>>>>>>>>> back
>>>>>>>>> but
>>>>>>>>> I
>>>>>>>>> would rather fix it if it is a simple fix.
>>>>>>>>>
>>>>>>>>> Another question. Will the Corsair 263 VFO work on the OMNI C?
>>>>>>>>>
>>>>>>>>> I would greatly appreciate any advice on this problem.
>>>>>>>>> Regards
>>>>>>>>>
>>>>>>>>>        Mike K1PEV
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> _______________________________________________
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>>>>>>>>> TenTec at contesting.com
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>>>>>
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