[TenTec] OMNI C Mixer or PTO problem

Mon Feb 20 13:29:08 PST 2012

Dear Gary

As I indicated in my previous email to you,  I looked in the manual in Section 2-1, accessories socket and there is no mention of the jumper either there or on the schematic block diagram. In the Corsair manual the jumper is mentioned in both places. 

That doesn't rule out the possibility that there SHOULD be a jumper, however. 

Regards
   Mike K1PEV

Sent from my iPhone

On Feb 20, 2012, at 2:52 PM, GARY HUBER <glhuber at msn.com> wrote:

> see 
> http://www.tentec.com/downloads/manuals/Omni%20A%20-%20D%20Owner%20Manual.pdf
> 
> 2-1  SECTION II
> DETAILED OPERATING INSTRUCTIONS
> REAR PANEL CONNECTIONS
> 
> NOTE: There must be a jumper for the VFO IN/OUT AND a Molex connecter with 
> short in the accessory socket.
> 
> 
> 73 ES DX,
> Gary -- AB9M
> 
> -----Original Message----- 
> From: GARY HUBER
> Sent: Monday, February 20, 2012 1:15 PM
> To: Discussion of Ten-Tec Equipment
> Subject: Re: [TenTec] OMNI C Mixer or PTO problem
> 
> Its been at least twenty years since I sold my OMNI-C and replaced it with
> the CORSAIR-II still on my operating desk. Both radios were ordered with
> external VFOs but were occasionally run with out and required both a jumper
> in the VFO IN and VFO OUT jacks and the accessory jack. The original
> complaint symptoms sounds suspiciously like the VFO jumper being removed.
> And in fact the same jumper being removed causes the same symptoms with a
> CORSAIR-II. SO the first question should be is that jumper in place on the
> back of the OMNI-C? Often it is missing or the new owner has overlooked
> plugging it back in. If both jumpers are in place, then the next thing to do
> is to look for a loose or disconnected connection between boards or sub
> assemblies all the way to the digital display. I have in the past seen the
> symptoms described when one connector (HFO) inside the digital display
> enclosure has been unplugged.
> 
> 
> 73 ES DX,
> Gary -- AB9M
> 
> 
> 
> -----Original Message----- 
> From: Joe
> Sent: Monday, February 20, 2012 12:35 PM
> To: Discussion of Ten-Tec Equipment
> Subject: Re: [TenTec] OMNI C Mixer or PTO problem
> 
> 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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