[TenTec] OMNI C Mixer or PTO problem

Mon Feb 20 13:36:56 PST 2012

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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