[TenTec] Omni VI & SignaLink USB

[Bob McGraw - K4TAX]

Yes, this is depending on how the PTT circuit is wired in the mike.

Some PTT circuits in the mike keep the mike element "live" thus it can be 
used with VOX.

Other PTT circuits in the mike short or disconnect the mike element until 
the PTT button is activated.

73
Bob, K4TAX


----- Original Message ----- 
From: "Brian Carling" <bcarling at cfl.rr.com>
To: "Clayton Brantley" <clayton_n4ev at yahoo.com>; "Discussion of Ten-Tec 
Equipment" <tentec at contesting.com>
Sent: Friday, July 11, 2014 12:06 PM
Subject: Re: [TenTec] Omni VI & SignaLink USB


> Seems like some of the mics do not present any audio out unless their PTT 
> button is activated...
>
> Best regards - Bry Carling
>
>
>
>> On Jul 10, 2014, at 9:32 AM, Clayton Brantley via TenTec 
>> <tentec at contesting.com> wrote:
>>
>> Bob:  The Omni VI+ manual does caution you that both the mike and the 
>> rear audio connector are in
>> parallel and infers that you should remove the mike when using the rear 
>> panel audio input. The manual
>> does caution you that the mike is still active and using digital modes 
>> any noise the mike hears is also
>> transmitted
>>
>> This is not from the "horse's mouth" but just from my reading the manual.
>>
>>
>> On Thursday, July 10, 2014 8:45 AM, Bob McGraw - K4TAX 
>> <RMcGraw at Blomand.net> wrote:
>>
>>
>>
>> I'm trying to assist a friend setting up his Omni VI with a SignaLink 
>> USB.  He does have the cable supplied from SignaLink and it seems to be 
>> connected to the radio correctly.  It receives and decodes PSK-31 very 
>> satisfactorily and it keys the transmitter correctly.
>>
>> The difficulty is having both the SignaLink connected to the Audio IN on 
>> the rear and the microphone connected to the front at the same time.  The 
>> SignaLink appears to key the radio correctly but does not produce output. 
>> When he then later and on a different frequency tries to transmit SSB 
>> only white noise is heard.  If he unplugs the cable to/from the SignaLink 
>> the noise is not heard. This occurs when the SignaLink is off or on.
>>
>> It appears from the schematic the mike input on the front and the rear 
>> Audio In are each isolated by a 10K series resistor to a summing point at 
>> the mike amp input.  Using a low impedance {500 ohm} dynamic mike and the 
>> SignaLink output being some 600 ohms, I calculate the isolation between 
>> the two inputs would be some 35 dB or so. Certainly this would seem to be 
>> very adequate isolation such that having the two connected, although the 
>> SignaLink is off, it would not interfere with the use of the mike.  And 
>> with the SignaLink on it would produce audio and it would not be 
>> interfered with the connected mike.
>>
>> Anyone have any specific experience or thoughts on this configuration?
>>
>> 73
>> Bob, K4TAX
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