[1000mp] voice recorder and cw for mark v

[Joe Subich, K4IK]

> Neither.  I connect the sound card line out to the patch 
> input on the MkV.
> 
> A potential problem here is that the mic input is in parallel 
> (sort of) with the patch input.  If you have a dynamic mic, such 
> as a Heil, you will hear your recorded messages coming out of 
> your microphone.  Very disconcerting, especially when you can't 
> figure out where the sound is coming from.  To get around this, 
> I plug the mic into the mic input on the soundcard and leave it 
> there.

The patch and mic inputs are more than "(sort of)" in parallel - 
they're directly in parallel without any isolation.  If one 
connects the sound card output to the patch input, sounds in the 
shack can be transmitted along with voice messages (voice keyer) 
or AFSK/PSK (digital mode).  

Use an interface, there are several schematics shown on the VA3CR 
web site, to route voice mode (voice keyer) audio to the DVS2 jack 
and digital mode audio to the PKT jack.  Doing so will result in 
muting the microphone when using soundcard audio.  

As an alternative, use a DPDT relay to switch the front panel 
input between the sound card output (with proper level attenuation 
and transformer isolation) and the microphone.  The PTT (or foot) 
switch can be used to pull in the relay. 

73, 

   ... Joe, K4IK