[TenTec] Omni VI & SignaLink USB

[Al Sirois]

0500 EDT
Friday
11 July 14

G.M., Bob:

Although I had some difficulty making the correct setting when getting 
started, things are working well, NOW.

As instructed in the MENU, I normally select "both" MIC & AUDIO ACCESSORY 
when doing MARS.

We utilize MT-63-2K most of the time. I don't disconnect the MIC at any 
time. The MIC can be disconnected thru the MENU.

N1MHC at arrl.net
Al Sirois
East Boothbay, ME
===============

-----Original Message----- 
From: Bob McGraw - K4TAX
Sent: Thursday, July 10, 2014 8:45 AM
To: Discussion of Ten-Tec Equipment
Subject: [TenTec] Omni VI & SignaLink USB

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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