[ICOM] ACC port vs. MIC port on IC-718

[Mike McCarthy, W1NR]

The ACC connector has line level inputs and outputs that have impedance
levels close to that of the usual sound card line input and output ports
(around 5k ohms).  They are also unaffected by the mic and audio gain
controls on the front panel.  Audio levels are controlled by the sound
card controls.

Some software like WriteLog recommend that the mic be plugged into the
sound card mic input which is then routed out to the ACC port.  Writelog
mutes the microphone when using the voice keyer function keys.

Not sure on the 718, but putting a Pro-III into USB-D mode disconnects
the mic input for AFSK and PSK digital modes through the ACC connector. 
See what the 718 manual says about that...

Mike, W1NR

Christopher J. Pilkington wrote:
> I have an Icom IC-718.  My computer interface connects from the sound
> card to the ACC port on the rig.
>
> What I'm contemplating doing is using VoIP software such as Skype to
> provide the audio path between my remote location, using a laptop, and
> the shack PC, connected to the radio.  I'll be using grig/hamlib for
> rig control and PTT, Skype will only be the audio path.  I've already
> locked down the Skype account on the shack PC so that it will only
> accept calls from my account.
>
> What is the ACC port bypassing, if anything, and what would this
> affect using speech through it?  Is there a disadvantage to using the
> ACC port over the MIC port?
>
> Also, when transmitting using the ACC port, is the MIC port muted on
> this rig?  (I've been pulling the MIC just to be safe, but I'm
> curious.)
>
> Thanks,
>