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Re: [TenTec] Omni C

To: <wa3fiy@radioadv.com>, "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Subject: Re: [TenTec] Omni C
From: "Joe" <joe@n4yg.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Tue, 21 Feb 2012 09:51:12 -0600
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
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 

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.

----- Original Message ----- 
From: "Lee WA3FIY" <wa3fiy@radioadv.com>
To: "Rick - DJ0IP / NJ0IP" <Rick@DJ0IP.de>; "Discussion of Ten-Tec 
Equipment" <tentec@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-
> 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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