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@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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