[TenTec] Omni C

Tue Feb 21 18:34:34 PST 2012

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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