“bathroom sound” and in severer cases will cause squealing or other undesirable effects.
On of the most common causes for this is missing microphone cable shields due to broken
wires or poor quality or unsuitable microphone cables.
Sometimes very close proximity of the transmitting antenna to headsets or other aircraft
wiring may be the cause.
In difficult cases, use of ferrite beads placed at strategic locations over your microphone and
headset cables may help block RF from traveling on these cables. Ensure you use ferrites
made to operate in the 100-150Mhz frequency band for this to be effective.
Never route your antenna cable inside a bundle with other wires in your aircraft. Keep your
antenna cable well separated from all other cables.
One of the prime causes of RF feedback is a badly matched antenna. Your V16 contains a full
feature SWR meter which you can use to check your antenna tune. Please ensure that SWR
measured at three frequencies (118, 127 and 136 MHZ are good choices) is less than 1.3 if
possible. You want this number to be as small as possible. This number indicates how much
of the transmitters power is being absorbed and radiated by the antenna. Any power not
radiated is reflected back towards your transmitter where it may enter your aircraft's power
supply grounds and audio system. A low SWR number also indicates that your antenna will
perform well during reception.
The most common reason for bad SWR in an aircraft is an unsuitable, missing or too small
ground plane for the commonly used monopole antenna,
TX signal delay
The audio signal transmitted is automatically delayed by 8mS (milliseconds) using a digital
delay chain. This delay is short and cannot be noticed via the sidetone by the pilot. The
purpose of this delay is to help break potential RF feedback loops by destroying the required
time relationship between microphone signal and transmitted signal to favor oscillation.
Note that this does not completely eliminate feedback effects in all cases. The best way to
prevent feedback it to eliminate the causes caused by poor or compromised installations.
RS232 and CAN bus communication protocols
The protocols used to communicate with the V16 are available to third party developers that
would like to integrate the V16 into their systems.
Please contact MGL Avionics (info@MGLAvionics.co.za) to obtain the latest protocol
documentation.
Setup menu
The setup menu's exact visual form cannot be described here as it depends on the type of
control system (Head or EFIS).
However in principle it is similar across all platforms and consists of a text created by the
radio once the menu system has been activated.
The text represents one menu item which can either be selected or changed depending on its
type.
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