Posted for "Bob B." <rbelshe@comcast.net>:

 Bob,
 I have a SL60 GPS/COM which I think is very similar to the SL30 NAV/COM.
 It requires a switch or button to use the intercom.  The manuals hardly
 mention the intercom, the installation manual shows one pin with the remark
 "pull low to turn on the intercom function".  The installation manual also
 states that the monitor function is inhibited when the intercom function is
 selected.  Instead of the built-in, I use a Sigtronics SPA400 which is about
 the size of a cigarette package and works very well. You just need a panel
 space about 1" by 2".    http://www.sigtronics.com/air/spa.html
 
 If one has just two radios, an audio panel is not really necessary.  A
 toggle switch will select com1/com2, and a simple resistor network will mix
 the audio.
 
 I have wiring diagrams if you want to look at them.
 
 Bob Belshe
 Moraga, CA
 Lancair 235/320
 http://home.comcast.net/~rbelshe/
 
 
 
"""
  I am considering a radio upgrade in my 235/320. Not having acres of
   panel space like a Lancair IV, I am looking for small, lightweight
   configurations. One possiblity is to use the Garmin SL30 Nav/Com
   which includes a built-in 2-place intercom. Having only two seats,
   and no room for more, that seems like it might suffice while also
   allowing me to listen to the standy frequency, and monitor the radial
   from the standby VOR. It all sounds pretty slick...

   But - will I be happy with the intercom's performance?
   Or will I want a separate audio panel anyway?
   The intercom does not have dedicated knobs, but instead requires twisting
   and selecting menu items to adjust volume or squelch.
   Does the SL30 have non-muting inputs for alarms or annunciators?
   If anyone is using an SL30 and its integrated intercom, I'd like to hear
   about your results.

   -bob mackey
    bob  (AT)   pure-flight.com
"""