We have put a basic guide on our website at www.MGLAvionics.co.za
- cutting out the mumbo-jumbo and just focussing on the basics.
Yes, there is a lot you can adjust but that is there for a purpose.
Provided your installation is correct it's simple. (I saw one that was not last week - the guy just used computer cable and routed ALL audio cables inside a single shielded multi-core cable for some 8 feet to a box where he plugged in his headsets - the microphone cables run right next to the headset cables and are not shielded against each other and yes - that can cause feedback).
OK, switch VOX or Vogad (whatever you have selected) OFF. Now adjust the microphone level so your voice is at about the same loudness as an incomming close range RX or similar to the level of the side-tone when you press TX. The TX has a very effective digital automatic gain adjust to ensure best possible modulation so you can use that as reference (Adjust mutiple levels if you are allowing each input to have its own level adjustment - useful if you are using different makes of headsets).
Make sure your microphone is right in front of your mouth - that is where we want it so the noise canceling can work at its best.
Once your intercom levels are good, select the type of noise canceling you would like to use. My recommendation for an RV would be "Vogad medium".
Now select the vogad level to about 2 or 3. That should be very close. Now go for a flight and adjust that level down until you hear the noise breaking through - then up it until the noise goes away. At that point start talking into the microphone. It should neatly allow your voice through but not the noise - like a VOX system just you don't notice any "switching" or delay to open the intercom.
Once you have found the right settings for your environment, you'll likely never touch them again...
One other thing to mention (not too relevant for a metal aircraft like an RV) is distance from the antenna to the headsets and headset wiring. The V6 is a powerful radio that modulates the transmit carrier always to maximum effect (80% modulation, digitally controlled). This increases the chance for "RF feedback" - similar to placing a microphone too close to the speaker on a stage. The RF received by the microphone amplifier in the headset cna partly demodulate the signal and thus complete a nice audio feedback path.
Another source: If your antenna connection is poor you will not radiate all (or most) of the RF energy through the antenna. Instead, your antenna cable becomes part of the antenna and your antenna cable shield which is routed inside the cockpit starts emmiting significant power levels. Of cause all of that is now causing trouble for the rest of your electronics and can even cause problems for EFIS systems.
The V6 typically produces a 7.5W RF level, slightly dependent on the frequency you have tuned it at (more at the band limits) which means some 18W peak power. This is significant so please ensure that installation is good or else there will be problems - that is almost guaranteed.
CEO MGL Avionics
Originally Posted by thinkn9a
Initial indications are I will be pleased once I get sorted out with settings for noise rejection/voice activation.
After initial on ground checkout was successful, including comm check, went flying and while some of the flight was uneventful, ended up having some issues during the latter half of the flight. (problems getting voice pickup without "feedback") Reset some of the settings and it seems to be doing ok.... Tower recognizes better reception, compared to old radio.
I think if there is any problem with the unit,.. it is TOO adjustable and responsive due to the digital circuitry, and therefore there are several settings and modes that are possible and the best combination needs to be found. (Unlike the old analog machines that had very limited adjustment to be made.... another example of difference is that transmissions from distant airports would cut in clearly or drop out, where it would probably be just ignored on old analog)
Intercom also is fine, although at this point I just have pilot/co-pilot mics plugged in.
Nice capability in small package...