"Somebody check your mike on the radio, please..."

Larry Dighera wrote:
On Tue, 22 Nov 2005 12:39:12 -0500, Javier Henderson
wrote in ::

The so-called "split" function exists on the KMA28, made by PS
Engineering, as well as of course the PS Engineering branded audio
panels with built-in intercoms.

I've a KMA28, and on a few occasions I've been talking to ATC on the
pilot side, while a friend would be calling an FBO on their ARINC
frequency to arrange for a car, or whatever.

I find it interesting that the PS Engineering KMA28 documentation
fails to mention this 'split function':
http://www.ps-engineering.com/pdf/Ma...0%20Manual.PDF

BTW, you pointed to a CD player installation and operation manual.

-jav

On Tue, 22 Nov 2005 12:52:50 -0500, "Peter R."
wrote in ::

Larry Dighera wrote:

That's not what it says he
http://www.garmin.com/products/gma347/

The GMA 347 audio panel builds upon the successful attributes of
the GMA 340
snip

The GMA340 certainly has this feature.

Indeed page 4 of the Gramin GMA340 audio panel Pilot's Guide documents
Split COM operation.* I wouldn't have thought the COM receiver would
possess adequate selectivity to prevent adjacent channel splatter when
the receiving and transmitting antennas are in such close proximity.


*
http://www.garmin.com/manuals/GMA340...ilotsGuide.pdf

Transceivers

--------------------------------------------------------------------
Audio level is controlled by the selected COM radio volume control
--------------------------------------------------------------------

Selection of either COM1, COM2, or COM3 (13) for both MIC and
audio source is accomplished by pressing either COM1 MIC, COM2 MIC, or
COM3 MIC (14). The active com audio is always heard on the
headphones.

Additionally, each audio source can be selected independently by
pressing COM1, COM2, or COM3 (13). When selected in this way, they
remain active as audio sources regardless of which transceiver has
been selected for microphone use.

When a microphone is keyed, the active transceiver's MIC button
LED blinks approximately once per second to indicate that the radio is
transmitting.

Split COM 9Not Available on Dual ADF)
-------------------------------------

Pressing the COM1/2 button (15) activates the Split COM function.
When this mode is active, COM1 is dedicated solely to the pilot for
MIC/audio while COM2 is dedicated to the copilot for MIC/audio. The
pilot and copilot can simultaneously transmit in this mode over
separate radios. Both pilots can still listen to COM3, NAV1, NAV2,
DME., ADF, and MKR as selected. The Split COM mode is cancelled by
pressing the COM 1/2 button a second time.

When in the Split COM mode the copilot ma make PA announcements
while the pilot continues using COM1 independently. When the PA
button is pressed after the Split COM mode is activated, the copilot's
mic is output over the cabin speaker when keyed. A second press of
the PA button returns the copilot to normal Split COM operation.

----------------------------------------------------------------------
If the COM radios utilize a "transmit interlock" system, the Split COM
function may require that the feature is enabled. Refer to the
radio's installation manual for guidance. GARMIN makes no
expressed of implied guarantees regarding the suitability of Split COM
feature in a given installation.
----------------------------------------------------------------------

On Tue, 22 Nov 2005 13:53:10 -0500, Javier Henderson
wrote in ::


BTW, you pointed to a CD player installation and operation manual.

An error caused by my haste.

Unfortunately, subsequent searches failed to locate useful KMA28
documentation. The closest I could come was this:
http://www.aircraftspruce.com/catalog/avpages/kma28.php

"Larry Dighera" wrote in message
...
On Tue, 22 Nov 2005 10:16:15 -0700, Newps wrote
in ::

The Garmin audio panel allows
the two pilots to each talk on a separate radio, on different freq's, at
the same time.

That's not what it says he
http://www.garmin.com/products/gma347/

The GMA 347 audio panel builds upon the successful attributes of
the GMA 340 while adding benefits such as automatic squelch,
digital clearance recorder, and a full-duplex telephone interface.


Split Com - Copilot may transmit and receive on COM2 while Pilot transmits
and receives on COM1

from the GMA 340 spec which the GMA 347 "builds upon"

Allen

On Tue, 22 Nov 2005 11:23:08 -0700, Newps wrote
in ::



Larry Dighera wrote:
On Tue, 22 Nov 2005 10:16:15 -0700, Newps wrote
in ::


The Garmin audio panel allows
the two pilots to each talk on a separate radio, on different freq's, at
the same time.


That's not what it says he
http://www.garmin.com/products/gma347/

I have the 340.

I referred to the GMA347, because in Message-ID:
you stated:

And I have the newest Garmin audio panel.

On Tue, 22 Nov 2005 08:28:12 -0700, Newps wrote
in ::

You can hear a little garbling if you are
talking on close frequencies like 122.75 and 122.8 The Garmin audio
panel does not shut down the receiver of the radio not being transmitted on.

That is remarkable receiver selectivity performance. What com
equipment do you have installed? Is it Garmin as well?

Not only is it remarkable selectivity, but crossmod, intermod, and all the
rest of the *mods combined with the antennas less than 5 feet apart, a 10
watt transmitter and a 1 microvolt receiver. One might be tempted to call
it a miracle.

Jim



"Larry Dighera" wrote in message
...
..

That is remarkable receiver selectivity performance. What com
equipment do you have installed? Is it Garmin as well?

Larry Dighera wrote:

I find it interesting that the PS Engineering KMA28 documentation
fails to mention this 'split function':
http://www.ps-engineering.com/pdf/Ma...0%20Manual.PDF

Thats for the CD player...

These do it:
http://www.ps-engineering.com/pac24.shtml
http://www.ps-engineering.com/pma7000b.shtml
http://www.ps-engineering.com/pma7000cd.shtml
http://www.ps-engineering.com/pma8000SR.shtml

Page 3:
http://www.ps-engineering.com/docs/PMA8000B_PG.pdf

Larry Dighera wrote:

On Tue, 22 Nov 2005 08:28:12 -0700, Newps wrote
in ::


You can hear a little garbling if you are
talking on close frequencies like 122.75 and 122.8 The Garmin audio
panel does not shut down the receiver of the radio not being transmitted on.


That is remarkable receiver selectivity performance. What com
equipment do you have installed? Is it Garmin as well?


No, just a pair of crappy Narco Mk 12D's.

RST Engineering wrote:

Not only is it remarkable selectivity, but crossmod, intermod, and all the
rest of the *mods combined with the antennas less than 5 feet apart, a 10
watt transmitter and a 1 microvolt receiver. One might be tempted to call
it a miracle.

I remember some of this vaguely from when I was active with amateur
radio but all that info is long gone. How does it work then?