[TenTec] Omni C

Wed Feb 22 03:54:28 PST 2012

Yes, I did that and got no frequency r

Regards
   Michael

Sent from my iPhone

On Feb 21, 2012, at 10:37 PM, "Joe" <joe at n4yg.com> wrote:

> Mike,
> 
> I do not know what the PTO looks like in the OMNI. In my Corsair II, all 
> connections are solder. The output goes to a feedthrough. The feedthrough 
> solders to a piece of RG-174 coax which goes directly to the VFO OUT jack on 
> the rear panel. You should not have to open up the rig in order to see if 
> there is output from the PTO. Just connect to the RCA jack on the rear panel 
> labeled VFO OUT.
> 
> 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: Tuesday, February 21, 2012 8:34 PM
> Subject: Re: [TenTec] Omni C
> 
> 
>> Dear Joe
>> 
>> I'm confused at this stage. I connected the frequency counter to the RCA
>> phono jack which is, I believe, the PTO output. This jack is located on
>> the top of the VFO box in the left rear corner when looking at it from the
>> front. The counter doesn't display any reading. Also when I did a
>> continuity check between the cable that was connected to the RCA socket on
>> the VFO box and the VFO OUT socket at the back of the rig, I din't have
>> continuity.
>> 
>> Am I right in assuming that the RCA socket on the VFO box is the VFO
>> output? If not, then it would explain my confused readings. If so, then I
>> will sleep on it, tomorrow is another day!
>> 
>> Regards
>>        Mike
>> 
>> 
>> 
>> On 2/21/12 12:16 PM, "Joe" <joe at n4yg.com> wrote:
>> 
>>> That should tell you if it is the PTO, and you can proceed from there. I
>>> will be listening and looking.
>>> ----- Original Message -----
>>> From: "Michael B. Silevitch" <msilevitch at coe.neu.edu>
>>> To: "'Discussion of Ten-Tec Equipment'" <tentec at contesting.com>
>>> Cc: <msilevitch at coe.neu.edu>
>>> Sent: Tuesday, February 21, 2012 11:13 AM
>>> Subject: Re: [TenTec] Omni C
>>> 
>>> 
>>>> Dear Joe
>>>> 
>>>> I obtained a loan of a 80MHz frequency counter and a 100MHz scope. I'll
>>>> use
>>>> these instruments to get more info on the signals. I will be out of town
>>>> starting tomorrow so I will probably only be able to get to this after
>>>> Sunday. If need be I'll get a signal generator as well.
>>>> 
>>>> Regards,
>>>>  Michael
>>>> 
>>>> -----Original Message-----
>>>> From: tentec-bounces at contesting.com
>>>> [mailto:tentec-bounces at contesting.com]
>>>> On Behalf Of Joe
>>>> Sent: Tuesday, February 21, 2012 10:51 AM
>>>> To: wa3fiy at radioadv.com; Discussion of Ten-Tec Equipment
>>>> Subject: Re: [TenTec] Omni C
>>>> 
>>>> Having built a VFO which does everything that the 243 does and more, I
>>>> can
>>>> tell you how that unit works with the Corsair II and other transceivers
>>>> which have the ENABLE pin on the PTO. The OMNI obviously does not have
>>>> the
>>>> ENABLE pin nor the E signal, so things are different.
>>>> 
>>>> The 243 works with the Corsair II as follows. The accessory jack has an
>>>> E
>>>> pin, the PTO ENABLE. When the 243 is connected to the accessory jack, it
>>>> connects and disconnects the 8 volt regulated voltage from the E line
>>>> going
>>>> back to the Corsair as desired depending on whether or not the PTO
>>>> should
>>>> be
>>>> 
>>>> on. For example when working split, the remote would be on during
>>>> transmit
>>>> for example and the PTO would be off and vice versa for receive. When
>>>> using
>>>> the remote for both Tx and Rx, the PTO would be simply turned off, ie,
>>>> the
>>>> E
>>>> 
>>>> line disonnnected from 8 volts. When receiving simultaneously, both the
>>>> PTO
>>>> and the remote are on and the two signals are added before being output
>>>> to
>>>> the Corsair and thus both frequencies can be monitored simultaneously.
>>>> 
>>>> This are apparently different in the OMNI C. I would guess that the 243
>>>> has
>>>> a means of switching the PTO output, which is apparently always present
>>>> at
>>>> the VFO OUT jack. By switching the PTO as well as its internal VFO
>>>> signal,
>>>> the same thing must be accomplished. I have not studied the schematic
>>>> to
>>>> see
>>>> 
>>>> how it is actually done, but reed relays or diode switching would seem
>>>> to
>>>> be
>>>> 
>>>> possible.
>>>> 
>>>> In order to proceed with troubleshooting this problem, we need to know
>>>> if
>>>> there is any output from the VFO. Alternatively, if a 243 is available,
>>>> it
>>>> could be hooked up to see if the receiver works.
>>>> 
>>>> Joe
>>>> ----- Original Message -----
>>>> From: "Lee WA3FIY" <wa3fiy at radioadv.com>
>>>> To: "Rick - DJ0IP / NJ0IP" <Rick at DJ0IP.de>; "Discussion of Ten-Tec
>>>> Equipment" <tentec at contesting.com>
>>>> Sent: Tuesday, February 21, 2012 9:09 AM
>>>> Subject: Re: [TenTec] Omni C
>>>> 
>>>> 
>>>>> 
>>>>> 
>>>>> OK.   I have three drawings here regarding this VFO question, Omni A-D
>>>>> download manual,
>>>>> Model 243 Remote Vfo Manual (Manual states it is for the Omni series
>>>>> transceivers) and
>>>>> Corsair II.
>>>>> 
>>>>> All three show a Molex 9 pin accessory connector.  That's common.
>>>>> 
>>>>> Common pin assignments are:
>>>>> pin 1 - T voltage
>>>>> pin 2 - plus regulated voltage
>>>>> pin 3 - plus 13 volts
>>>>> pin 4 - shift (Omni it is  called REM VFO)
>>>>> pin 8 - ground
>>>>> 
>>>>> Different pin assignments are:
>>>>> Omni:
>>>>> pin 5 - local oscillator out (for frequency counter)
>>>>> pin 6 - relay common
>>>>> pin 7 - relay normally open
>>>>> pin 9 - relay normally closed
>>>>> 243 VFO:
>>>>> pin 5 - local oscillator in
>>>>> pin 6 - no connection
>>>>> pin 7 - no connection
>>>>> pin 9 - no connection
>>>>> Corsair II:
>>>>> pin 5 - R voltage
>>>>> pin 6 - Corsair VFO enable (note indicates this pin must be jumpered to
>>>>> pin 2 when remote
>>>>>          vfo is not being used.)
>>>>> pin 7 - relay normally open
>>>>> pin 9 - relay normally closed
>>>>> (relay common is internally grounded in Corsair)
>>>>> 
>>>>> Hope this helps.
>>>>> 
>>>>> 73,
>>>>> 
>>>>> -Lee-
>>>>> 
>>>>> WA3FIY
>>>>> 
>>>>> On 21 Feb 2012 at 14:17, Rick - DJ0IP / NJ0IP wrote:
>>>>> 
>>>>>> Gary, the 243 is the wrong radio and the wrong manual.
>>>>>> That's for the old Triton, which was different.
>>>>>> It had the Octal Jack on the back and indeed pins 6, 7, and 8 were for
>>>>>> the VFO.
>>>>>> 
>>>>>> Mike has an Omni C.
>>>>>> It has a 9-Pin Molex accessory socket on the back and totally
>>>>>> different signals on it than the 243's accessory jack.
>>>>>> 
>>>>>> I have a hard copy manual for OMNI A and D on my desk.
>>>>>> I have the downloaded OMNI C on my screen.
>>>>>> Both are identical and Mike (Brice) already posted the signals that
>>>>>> are on it. There is NO JUMPER required for the VFO management.
>>>>>> 
>>>>>> 73
>>>>>> Rick
>>>>>> 
>>>>>> 
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