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Re: [TenTec] Omni VI & SignaLink USB

To: <tentec@contesting.com>
Subject: Re: [TenTec] Omni VI & SignaLink USB
From: "Vic Klein" <vhklein@ptd.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Thu, 10 Jul 2014 10:07:36 -0400
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
I realize it isn't the same rig, but I had some set-up issues when I first
started using the SignaLink with my Paragon. I left the 705 mic plugged in
the front and used the audio-in and out jacks on the rear for the SignaLink.
I left the mic gain as appropriate for my mic and adjusted the SignaLink to
get ALC to come on, which turned out to be about 9-o'clock on both controls.
The big trick was leaving the SignaLink on all the time. If I turned it off
I got lots of RF in the audio, much as you describe, when using SSB. With
the SignaLink always powered...no issues at all and the combination works
well.

=Vic=
WA4THR
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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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