[Ham-Mac] Mac - SignaLink - CocoaModem

[Dick Kriss]

On Jun 19, 2012, at 2:33 PM, Alan Bomberger wrote:

> How is it that CocoaModem (and fldigi) can read signals from the
> SignaLink when the Signalink power is off?   I noticed this the
> other day when I went to answer a CQ and the transmitter didn't go
> on.  No Power, No PTT.  Granted the receiver input is much lower than
> with power on but what is running the ADC chip?
> -- 
> It is seldom that liberty of any kind is lost all at once. - David Hume
> <http://www.waldenpond.com/Thinker> Hypertext editor for creative people.
> ______________________________________________________________
> Ham-Mac mailing list

I am quoting from memory but as I recall the only active (or powered) circuit in the SignaLink is for the Auto-PTT.  It is almost passive for RX; however, when I had one I noticed some minor Rx attenuation and this was confirmed by Tigertronics.

Dick AA5VU