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[TenTec] Omni VI & SignaLink USB

To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Subject: [TenTec] Omni VI & SignaLink USB
From: "Bob McGraw - K4TAX" <RMcGraw@Blomand.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Thu, 10 Jul 2014 07:45:00 -0500
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
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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