Rainbow Aircraft Inc. V10 Manual Do Utilizador
Connecting RS232 communication links
The V10 transceiver provides two RS232 communication links, each with a TX and RX line.
Each of the two RS232 links operates independent from the other using the same
communication protocols. This allows connection of the V10 two two independent EFIS
systems for full redundancy.
Connect the TX line of the V10 to the RX line of the EFIS and the RX line of the V10 to the TX
line of the EFIS. Usage of shielded cables is recommended. Connect the shield to either the
ground of the EFIS or the ground of the V10. Do not connect both as this may create a
ground loop. EFIS and V10 should share ground at the same potential (typically both have
grounds wired to a common distribution point or the negative of the battery.
Each of the two RS232 links operates independent from the other using the same
communication protocols. This allows connection of the V10 two two independent EFIS
systems for full redundancy.
Connect the TX line of the V10 to the RX line of the EFIS and the RX line of the V10 to the TX
line of the EFIS. Usage of shielded cables is recommended. Connect the shield to either the
ground of the EFIS or the ground of the V10. Do not connect both as this may create a
ground loop. EFIS and V10 should share ground at the same potential (typically both have
grounds wired to a common distribution point or the negative of the battery.
Connecting a MGL Avionics NAV receiver
Should you be using a MGL Avionics NAV receiver (VOR, ILS and glideslope), connect the TX
lines of both the V10 and the NAV receiver together. Also connect the RX lines in similar
fashion.
Connecting two TX lines together is not normally done with RS232 communications, however
your V10 transceiver and the MGL NAV receiver have special provision for this.
If wired together in this fashion, the two systems behave compatible to a Garmin SL30
NAV/COM system.
The MGL Avionics NAV radio also has two RS232 links and you can join both in this fashion
to the V10 radio and then to the EFIS system(s).
lines of both the V10 and the NAV receiver together. Also connect the RX lines in similar
fashion.
Connecting two TX lines together is not normally done with RS232 communications, however
your V10 transceiver and the MGL NAV receiver have special provision for this.
If wired together in this fashion, the two systems behave compatible to a Garmin SL30
NAV/COM system.
The MGL Avionics NAV radio also has two RS232 links and you can join both in this fashion
to the V10 radio and then to the EFIS system(s).
Using an external intercom system
If you are using an external intercom system that provides its own VOX or ambient noise
suppression system, it may be required to switch the built in VOX or VOGAD system off. You
switch this off by setting the level of the chosen system to zero (value displayed: OFF). You
select this in the first level menu system.
You may also need to experiment with the signal phase inversion function (second level menu
system) if you are experiencing RF feedback issues.
suppression system, it may be required to switch the built in VOX or VOGAD system off. You
switch this off by setting the level of the chosen system to zero (value displayed: OFF). You
select this in the first level menu system.
You may also need to experiment with the signal phase inversion function (second level menu
system) if you are experiencing RF feedback issues.
RF feedback – cause and elimination
RF feedback is a phenomena very similar to microphone feedback on a sound stage. The
modulated RF signal during transmission is received by your microphones or microphone
cables and routed to the input of your intercom system or V10 transceiver.
Here, some of the modulated signal may be demodulated by non-linearities in the system,
particularly if the received RF is very strong (typically several volts).
This creates a common feedback loop that in a mild form will create an echo similar to
“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.
modulated RF signal during transmission is received by your microphones or microphone
cables and routed to the input of your intercom system or V10 transceiver.
Here, some of the modulated signal may be demodulated by non-linearities in the system,
particularly if the received RF is very strong (typically several volts).
This creates a common feedback loop that in a mild form will create an echo similar to
“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.