[TenTec] Omni VI & SignaLink USB

[Richard Gerardi]

Clayton, Ah yes, thanks. Yes I do need to turn the mic mixer channel to
zero when I go digital.  Rich, AA6VX


On Thu, Jul 10, 2014 at 6:32 AM, Clayton Brantley via TenTec <
tentec at 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 at 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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-- 
Richard Gerardi
North Santa Barbara County ARES
Satellite Amateur Radio Club, W6AB
aa6vx at arrl.net