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@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@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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