emrath(at)comcast.net
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 Posted: Fri Nov 09, 2007 1:45 pm Post subject: 396/496 Audio Revisited. |
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Rumen,
Thanks for this posting, it is helpful.
What I would like to do is have the audio warnings input to the audio panel and to be able to listen to my IPOD. One can turn off the XM radio, if so subscribed, but the unit needs to be always connected to the panel. So for me, it appears using the Voice+ input to the audio panel's unswitched input is the way to go and use the switched audio inputs for the IPOD. Alternatively, 1/8" audio could be connected in parallel with the IPOD, maybe using 220 ohm resisters, to the Audio Panel's switched input and thus have both the IPOD and Warnings muted by radio calls. Someone please correct me if this doesn't seem correct, given the below informaton
Time: 02:46:14 PM PST US
From: rd2(at)evenlink.com
Subject: 396/496 Audio revisited
Thanks for all postings on the subject.
I just re-reviewed the manuals and talked to Garmin. Also, I have gone
through 196, 296 and 396.
To summarize on the AUDIO subject:
In aviation mode:
296 has terrain and obstructions, but no VOICE warnings
396 and 496 both have terrain and obstructions, as well as the following
VOICE warnings:
-Terrain
-Obstructions
-500 ft AGL
-Sink Rate
-Traffic (if so equipped)
The available outputs for the above warnings (as well as for XM audio) are:
1) Data cable (voice+ and voice- ; use only voice+ , if not using the
Garmin loudspeaker; do not use voice- ; inst ead, the ground of the power
cable is used; voice- is meant for loudspeakers with no connection to the
unit.
The Data Cable output is mono, low impedance, amplified (for loudspeaker)
The volume of the output can be controlled.
Music (if XM music is available) is soft-muted during warnings
2) 3.5 mm audio jack - stereo, line volume, higher impedance
Music (if XM music is available) is soft-muted during warnings.
The volume of the output can be controlled.
So, there is no difference between 396 and 496 in terms of available audio
(be it warnings or music) and there is no difference between the audio
available from the data cable (voice+ to loudspeaker) and the audio output
(3.5 mm jack). The only difference here is impedance, signal, and
mono/stereo. Volume is controllable in both cases and XM music is
soft-muted by the audio warnings. Volume controls everything coming out as
audio [Terrain, Obstru ctions , 500 ft AGL, Sink Rate, Traffic (if so
equipped), XM audio].
In aviation mode, Garmin does not encourage feeding the data+/- to the
panel because it is an amplified low impedance, mono output, intended for
speaker and the signal carries the same info as the 3.5 mm audio jack.
Finally, the audio can be fed to a switched/soft-muted input of the audio
panel or intercom (to be muted by any communication) or to a non-switched
input (to be always audible). Problem is in the latter case, if there is XM
audio, it will be always on during ATC communications.
How to feed the audio from the 396/496 is a matter of personal preference;
there are advantages and disadvantages with any approach; all taken into
consideration, my preference is to use the 3.5 mm line audio and to feed it
to a soft-muted input (e.g. intercom).
Rumen
[quote][b]
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