MGL Avionics V16 User manual

MGL Avionics
V16 Aviation band transceiver
and
A14/A16 Intercom system
Digital audio and control Integration
Manual
Full document is available for do nload
at .mglavionics.co.za

Table of Contents
General........................................................................................................................................3
Document history........................................................................................................................3
Applicability.................................................................................................................................3
Description..................................................................................................................................3
PTT connections.........................................................................................................................4
Setup...........................................................................................................................................4
RX Volume..................................................................................................................................4
V16 au io inputs an outputs.....................................................................................................4
Installation limitations..................................................................................................................5
Single COM transceiver wiring....................................................................................................5
Dual COM transceiver wiring......................................................................................................6
Au io signal flow.........................................................................................................................6
Mixe operation...........................................................................................................................7
A14 vs A16..................................................................................................................................7
A16/V16 LED with igital au io link............................................................................................7

General
Starting from firmware version V16 180222 ( mmyy) an A14/A16 firmware release 7
(release on 18 February 2022) the A14 or A16 may be connecte to one or two V16
transceivers in a fully igital manner eliminating the nee for any au io wiring as well as PTT
wiring between the evices.
In the case of using two V16 transceivers these will be referre to as COM1 an COM2.
Provi ing a igital link to transfer au io an control information ramatically re uces wiring
effort while at the same time increasing resilience of the total system to un esirable au io
effects cause by RF fee back or groun potential ifferences between evices or
interference on au io signals in general.
As both transceiver as well as intercom are implemente with igital au io circuits the irect
connection between intercom an transceiver in the igital omain eliminates the nee to
convert the au io signal into analog form an then back into igital on the other en of the
cable. This significantly improves au io quality as well as har ens the system against
interference.
Note: As from 16 March 2022 firm are releases required are V16 160322 and A14/A16
release 9. These updates improve the link stability in some cases. Both V16 and
A14/A16 units must be updated as there is a change in baudrate.
Document history
17 March 2022, secon release. Change bau rate an au io sample rate, a e section on
function of LED on both A14/A16 an V16.
18 February 2022, first release.
Applicability
The igital connection between intercom an transceivers is only functional for MGL Avionics
evices an cannot be use for any other manufacturers pro ucts.
In particular this applies to the MGL Avionics V16 transceiver an A14 as well as A16
intercom systems only.
Description
Digital connection between Transceiver an intercom evice is via RS232 port 2 on all
evices.
In case of a single transceiver (COM1) the connection is:
Intercom RS232 port 2 TX ---> V16 COM1 RS232 port 2 RX
Intercom RS232 port 2 RX <--- V16 COM1 RS232 port 2 TX
In case of a ual transceiver (COM1 + COM2) the connection is:
Intercom RS232 port 2 TX ---> V16 COM1 RS232 port 2 RX
V16 COM1 RS232 port 2 TX ---> V16 COM2 RS232 port 2 RX

Intercom RS232 port 2 RX <--- V16 COM2 RS232 port 2 TX
All evices woul normally share the same power supply groun . In this case there is no nee
for an a itional RS232 groun connection an such a connection is not recommen e as it
woul potentially intro uce a groun loop.
Shoul intercom an transceivers be operate on in ivi ual galvanically isolate power
sources then a RS232 groun connection is require between evices. Any groun point on
any evice may be use for this however any groun s marke as e icate au io groun s
shoul not be use .
PTT connections
With the igital link, PTT connections MUST be connecte to the intercom. The PTT
information (for both COM1 an COM2) will be transferre to the transceiver(s) via the igital
link.
You may connect the PTT wires to the transceivers in parallel but they will only be use by the
transceivers if the igital link is not operating.
Setup
Apart from provi ing the RS232 wiring, no further setup relate to the au io an PTT
connections is require . All au io signal levels to an from the transceivers are automatically
set.
RX Volume
With active igital link the RX volume is fixe to about 75% every time the link is establishe
(typically once after power cycle). However from this initial setting the RX volume may be
increase or re uce as nee e . Any mo ifie setting will be lost on a power cycle.
Any RX volume that was set with the igital link not active will retain its last value after a
power cycle as usual.
V16 audio inputs and outputs
With the igital link establishe the V16's au io output remains active.
The V16 microphone inputs are eactivate . Au io for transmission is sources exclusively
from the intercom system via igital link.
All other au io functions of the V16 (such as the voice recor er/playback) remain fully
operational.
All VOX functions of the V16 have no effect an are bypasse . The VOX functionality moves
to the intercom.
Si etone uring transmit is available via the igital link. Note that this can be switche off in
the V16 if so esire . Note further that the intercom itself has a si e tone function that is
configurable to bypass the ra io completely if so esire .
It is recommen e to leave the si etone in the V16 enable an to select the si etone from

the transceiver in the intercom setup.
Installation limitations
The RS232 link on port 2 will operate at high spee . Bau rate is 500.000 bits per secon .
This limits the length of the cable that may be use . It is recommen e to keep the length as
short as possible an not longer than 3 feet (1 meter) for each connection.
If shiel e cable nee s to be use the length of this connection may nee to be shorter. If you
use shiel e cable – please connect the shiel to groun on one si e only. Leave the other
en of the shiel unconnecte .
Single COM transceiver iring
In this configuration the V16 microphone inputs are not use an shoul be left unconnecte .
PTT inputs on the V16 also also not use .
Au io output of the V16 remains active but is not usually connecte to anything.

Dual COM transceiver iring
n this configuration the V16 microphone inputs are not use an shoul be left unconnecte .
PTT inputs on the V16 also also not use .
Au io output of the V16 remains active but is not usually connecte to anything.
The position of the V16 in the wiring etermines if it acts as COM1 or COM2. The V16 that
has its RX line connecte to the A16 TX line is always COM1.
Audio signal flo
Au io originates in the intercom at 8.000 samples per secon at a 16 bit resolution. In
a ition the state of its two PTT inputs is also inclu e . This is the au io that woul potentially
be transmitte .
This au io is receive by COM1. It's own au io, from the receiver or si etone uring TX is
then a e (as secon in epen ent igital au io signal) an both au io signals plus the PTT
states are then sent by COM1 an receive by COM2. COM2 then iscar s the au io from
the intercom for further transmission an replaces that with its own. Finally the intercom
receives both COM1 an COM2 au io signals as two in epen ent signals.

The igital au io link in all cases relies on the intercom which sen s its au io in igital format
– if any transceiver receives igital au io on its RS232 port 2 it switches into igital mo e an
forwar s the igital au io signal on its RS232 port 2.
Further information containe in the ata stream allows the receiver of the igital au io
stream to etermine the source of the signal.
If a receiver of a igital au io stream no longer receives that stream it will revert back to its
normal mo e of analog operation.
Mixed operation
It is possible to create a system with one A14/A16 intercom, one V16 using the igital link an
a further COM or NAV/COM ra io using a conventional analog au io connection.
In this case wire the intercom an V16 as shown for a single V16. This V16 will appear as
COM1 in the interface controller (Razor or EFIS).
COM2 will remain available as an analog connection as shown in the intercom installation
manual.
A14 vs A16
Both A14 an A16 intercom systems behave i entical as far as their COM1 an COM2
interfaces are concerne an everything state in this ocument applies for both.
Differences between the two:
A16 has 6 microphone inputs, A14 has 4 microphone inputs.
A16 has two e icate NAV ra io inputs. A14 oes not have these inputs but AUX inputs can
be use instea for this (A14 has two analog inputs less).
A16 has a ual circuit au io output system (both stereo). One output is for the PILOT circuit,
one for the PAX circuit. A14 has a single au io output circuit (also stereo) – both PILOT an
PAX share the same output signal for hea sets.
A16/V16 LED ith digital audio link
From V16 firmware release 160322 an A14/A16 firmware release 00009 the function LED
light is use as a iagnostics in ication to assist with the igital link.
Un er normal (no igital link) operation the LED functions as normal. It flashes once per
secon (0.5 secon s ON, 0.5 secon s OFF).
If the RX pin on RS232 port 2 on any evice etects the au io link the LED will give a ouble
flash (0.12 secon ON, 0.13 secon OFF, 0.12 secon ON, 0.63 secon OFF).
If the link looses sync ue to a isturbance or loss of ata the LED will perform a RAPID
continuous flash for a minimum uration of 3 secon s (even if the link fails only for a single
au io sample).